DESCRIPTIO FEATURES TYPICAL APPLICATIO. LT1215/LT MHz, 50V/µs, Single Supply Dual and Quad Precision Op Amps APPLICATIO S

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1 FEATRES Slew Rate: V/µs Typ Gain-Bandwidth Product: 23MHz Typ Fast Settling to.1% 2V Step to 2µV: 2ns Typ 1V Step to 1mV: 48ns Typ Excellent DC Precision in All Packages Input Offset Voltage: 4µV Max Input Offset Voltage Drift: 1µV/ C Max Input Offset Current: 12nA Max Input Bias Current: 6nA Max Open-Loop Gain: 1V/mV Min Single Supply Operation Input Voltage Range Includes Ground Output Swings to Ground While Sinking Current Low Input Noise Voltage: 12.nV/ Hz Typ Low Input Noise Current:.pA/ Hz Typ Specified on 3.3V, V and ±1V Large Output Drive Current: 3mA Min Low Supply Current per Amplifier: 6.6mA Max Dual in 8-Pin DIP and SO-8 Quad in 14-Pin DIP and NARROW SO-16 Note: For applications requiring less slew rate, see the LT1211/LT1212 and LT1213/LT1214 data sheets. LT121/LT MHz, V/µs, Single Supply Dual and Quad Precision Op Amps DESCRIPTIO The LT 121 is a dual, single supply precision op amp with a 23MHz gain-bandwidth product and a V/µs slew rate. The LT1216 is a quad version of the same amplifier. The DC precision of the LT121/LT1216 eliminates trims in most systems while providing high frequency performance not usually found in single supply amplifiers. The LT121/LT1216 will operate on any supply greater than 2.V and less than 36V total. These amplifiers are specified on single 3.3V, single V and ±1V supplies, and only require ma of quiescent supply current per amplifier. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The minimum output drive is 3mA, ideal for driving low impedance loads. APPLICATIO S 2.V Full-Scale 12-Bit Systems: V OS.7 LSB 1V Full-Scale 16-Bit Systems: V OS 3 LSB Active Filters Photo Diode Amplifiers DAC Current to Voltage Amplifiers Battery-Powered Systems, LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Single Supply Instrumentation Amplifier Frequency Response V IN 12Ω + V 1/2 LT Ω.1µF 113Ω NOTE:.1% RESISTORS GIVE CMRR 68dB. GAIN IS 1.V/V. COMMON MODE INPT RANGE IS FROM.3V TO 3.V. BANDWIDTH IS 2.8MHz. GAIN (db) DIFFERENTIAL INPT 12Ω 4 V IN + + 1/2 LT121 V OT 121/16 TA1 COMMON MODE INPT 6 7 1k 1k 1k 1M 1M FREQENCY (Hz) 121/16 TA2 1

2 ABSOLTE AXI RATI GS W W W Total Supply Voltage (V + to V )... 36V Input Current... ±1mA Output Short-Circuit Duration (Note 2)... Continuous Operating Temperature Range LT121C/LT1216C (Note 3)... 4 C to 8 C LT121M (OBSOLETE)... C to 12 C Specified Temperature Range LT121C/LT1216C (Note 4)... 4 C to 8 C LT121M (OBSOLETE)... C to 12 C (Note 1) Storage Temperature Range... 6 C to 1 C Junction Temperature (Note )... 1 C Plastic Package (CN8, CS8, CN, CS)... 1 C Ceramic Package (MJ8) (OBSOLETE) C Lead Temperature (Soldering, 1 sec)... 3 C PACKAGE/ORDER I FOR OT A IN A +IN A V OT A IN A +IN A V + +IN B IN B OT B A TOP VIEW B N8 PACKAGE 8-LEAD PDIP T JMAX = 1 C, θ JA = 1 C/W J8 PACKAGE 8-LEAD CERDIP T JMAX = 17 C, θ JA = 1 C/W N PACKAGE 14-LEAD PDIP T JMAX = 1 C, θ JA = 7 C/W V + OT B IN B +IN B W ATIO ORDER PART NMBER LT121CN8 LT121ACN8 LT121MJ8 LT121AMJ8 OBSOLETE PACKAGE Consider the N8 Package for Alternate Source A B TOP VIEW D C 14 OT D 13 IN D 12 +IN D 11 V 1 +IN C 9 IN C 8 OT C ORDER PART NMBER LT1216CN OT A 1 IN A 2 +IN A 3 V 4 A TOP VIEW S8 PACKAGE 8-LEAD PLASTIC SO T JMAX = 1 C, θ JA = 1 C/W OT A 1 IN A 2 +IN A 3 V + 4 +IN B IN B 6 OT B 7 NC 8 TOP VIEW A B B D C S PACKAGE 16-LEAD PLASTIC SO V + OT B IN B +IN B 16 OT D 1 IN D 14 +IN D 13 V 12 +IN C 11 IN C 1 OT C 9 NC T JMAX = 1 C, θ JA = 1 C/W ORDER PART NMBER LT121CS8 S8 PART MARKING 121 ORDER PART NMBER LT1216CS Consult LTC Marketing for parts specified with wider operating temperature ranges. 2

3 AVAILABLE OPTIO S PACKAGE LT121/LT1216 NMBER OF MAX TC V OS CERAMIC (J) PLASTIC DIP SRFACE MONT OP AMPS T A RANGE MAX V OS (2 C) ( V OS / T) OBSOLETE (N) (S) Two (Dual) 4 C to 8 C 3µV 2.µV/ C LT121ACN8 4µV µv/ C LT121CN8 4µV 1µV/ C LT121CS8 C to 12 C 3µV 2.µV/ C LT121AMJ8 4µV µv/ C LT121MJ8 Four (Quad) 4 C to 8 C 4µV 1µV/ C LT1216CN LT1216CS V ELECTRICAL CHARACTERISTICS, V CM =.V, V OT =.V, T A = 2 C, unless otherwise noted. LT121AC LT121C/LT121M LT121AM LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Long-Term Input Offset.8 1. µv/mo Time Voltage Stability I OS Input Offset Current na I B Input Bias Current na Input Noise Voltage.1Hz to 1Hz 4 4 nv P-P e n Input Noise Voltage Density f O = 1Hz nv/ Hz f O = 1Hz nv/ Hz i n Input Noise Current Density f O = 1Hz pa/ Hz f O = 1Hz.. pa/ Hz Input Resistance (Note 6) Differential Mode MΩ Common Mode 2 2 MΩ Input Capacitance f = 1MHz 1 1 pf Input Voltage Range V.2.2 V CMRR Common Mode Rejection Ratio V CM = V to 3V db PSRR Power Supply Rejection Ratio V S = 2.V to 12.V db A VOL Large-Signal Voltage Gain V O =.V to 3.7V, R L = Ω V/mV Maximum Output Voltage Swing Output High, No Load V (Note 7) Output High, I SORCE = 1mA V Output High, I SORCE = 3mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 3mA V I O Maximum Output Current (Note 11) ±3 ± ±3 ± ma SR Slew Rate A V = V/µs GBW Gain-Bandwidth Product f = 1kHz MHz I S Supply Current Per Amplifier ma Minimum Supply Voltage Single Supply V Full Power Bandwidth A V = 1, V O = 2.V P-P MHz t r, t f Rise Time, Fall Time A V = 1, 1% to 9%, V O = 1mV ns OS Overshoot A V = 1, V O = 1mV 2 2 % t PD Propagation Delay A V = 1, V O = 1mV ns t S Settling Time.1%, A V = 1, V O = 2V 2 2 ns Open-Loop Output Resistance I O = ma, f = 1MHz 4 4 Ω THD Total Harmonic Distortion A V = 1, V O = 1V RMS, 2Hz to 2kHz.1.1 % 3

4 V ELECTRICAL CHARACTERISTICS, V CM =.V, V OT =.V, C T A 7 C, unless otherwise noted. LT121AC LT121C/LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Input Offset Voltage Drift 8-Pin DIP Package µv/ C T (Note 6) 14-Pin DIP, SO Package 3 1 µv/ C I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V V CMRR Common Mode Rejection Ratio V CM =.1V to 2.9V db PSRR Power Supply Rejection Ratio V S = 2.6V to 12.V db A VOL Large-Signal Voltage Gain V O =.V to 3.7V, R L = Ω V/mV Maximum Output Voltage Swing Output High, No Load V (Note 7) Output High, I SORCE = 1mA V Output High, I SORCE = 2mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 2mA V I S Supply Current Per Amplifier ma, V CM =.V, V OT =.V, 4 C T A 8 C, unless otherwise noted. (Note 4) LT121AC LT121C/LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Input Offset Voltage Drift 8-Pin DIP Package µv/ C T (Note 6) 14-Pin DIP, SO Package 3 1 µv/ C I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V.2.2 V CMRR Common Mode Rejection Ratio V CM =.2V to 2.8V db PSRR Power Supply Rejection Ratio V S = 2.7V to 12.V db A VOL Large-Signal Voltage Gain V O =.V to 3.7V, R L = Ω V/mV Maximum Output Voltage Swing Output High, No Load V (Note 7) Output High, I SORCE = 1mA V Output High, I SORCE = 2mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 2mA V I S Supply Current Per Amplifier ma 4

5 V ELECTRICAL CHARACTERISTICS, V CM =.V, V OT =.V, C T A 12 C, unless otherwise noted. LT121/LT1216 LT121AM LT121M SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Input Offset Voltage Drift µv/ C T (Note 6) I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V V CMRR Common Mode Rejection Ratio V CM =.4V to 2.8V db PSRR Power Supply Rejection Ratio V S = 2.7V to 12.V db A VOL Large-Signal Voltage Gain V O =.V to 3.7V, R L = Ω 1 1 V/mV Maximum Output Voltage Swing Output High, No Load V (Note 7) Output High, I SORCE = 1mA V Output High, I SORCE = 2mA V Output Low, No Load mv Output Low, I SINK = 1mA mv Output Low, I SINK = 2mA mv I S Supply Current Per Amplifier ma +1V ELECTRICAL CHARACTERISTICS, V CM = V, V OT = V, T A = 2 C, unless otherwise noted. LT121AC LT121C/LT121M LT121AM LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V V CMRR Common Mode Rejection Ratio V CM = 1V to 13V db PSRR Power Supply Rejection Ratio V S = ±2V to ±18V db A VOL Large-Signal Voltage Gain V O = V to ±1V, R L = 2k V/mV Maximum Output Voltage Swing Output High, I SORCE = 3mA V Output Low, I SINK = 3mA V I O Maximum Output Current (Note 11) ±3 ± ±3 ± ma SR Slew Rate A V = 2 (Note 8) 4 4 V/µs GBW Gain-Bandwidth Product f = 1kHz MHz I S Supply Current Per Amplifier ma Channel Separation V O = ±1V, R L = 2k db Minimum Supply Voltage Equal Split Supplies ±1.7 ±2 ±1.7 ±2 V Full-Power Bandwidth A V = 1, V O = 2V P-P 7 7 khz Settling Time.1%, A V = 1, V O = 1V ns

6 + 1V ELECTRICAL CHARACTERISTICS, V CM = V, V OT = V, C T A 7 C, unless otherwise noted. LT121AC LT121C/LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Input Offset Voltage Drift 8-Pin DIP Package µv/ C T (Note 6) 14-Pin DIP, SO Package 3 1 µv/ C I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V V CMRR Common Mode Rejection Ratio V CM = 14.9V to 12.9V db PSRR Power Supply Rejection Ratio V S = ±2.1V to ±18V db A VOL Large-Signal Voltage Gain V O = V to ±1V, R L = 2k V/mV Maximum Output Voltage Swing Output High, I SORCE = 2mA V Output Low, I SINK = 2mA V I S Supply Current Per Amplifier ma, V CM = V, V OT = V, 4 C T A 8 C, unless otherwise noted. (Note 4) LT121AC LT121C/LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Input Offset Voltage Drift 8-Pin DIP Package µv/ C T (Note 6) 14-Pin DIP, SO Package 3 1 µv/ C I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V V CMRR Common Mode Rejection Ratio V CM = 14.8V to 12.8V db PSRR Power Supply Rejection Ratio V S = ±2.2V to ±18V db A VOL Large-Signal Voltage Gain V O = V to ±1V, R L = 2k V/mV Maximum Output Voltage Swing Output High, I SORCE = 2mA V Output Low, I SINK = 2mA V I S Supply Current Per Amplifier ma, V CM = V, V OT = V, C T A 12 C, unless otherwise noted. LT121AM LT121M SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv V OS Input Offset Voltage Drift µv/ C T (Note 6) I OS Input Offset Current na I B Input Bias Current na Input Voltage Range V V CMRR Common Mode Rejection Ratio V CM = 14.6V to 12.8V db PSRR Power Supply Rejection Ratio V S = ±2.2V to ±1V db A VOL Large-Signal Voltage Gain V O = V to ±1V, R L = 2k 2 2 V/mV Maximum Output Voltage Swing Output High, I SORCE = 2mA V Output Low, I SINK = 2mA V I S Supply Current Per Amplifier ma 6

7 3.3V ELECTRICAL CHARACTERISTICS V S = 3.3V, V CM =.V, V OT =.V, T A = 2 C, unless otherwise noted. (Note 8) LT121/LT1216 LT121AC LT121C/LT121M LT121AM LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv Input Voltage Range (Note 1) V.2.2 V Maximum Output Voltage Swing Output High, No Load V Output High, I SORCE = 1mA V Output High, I SORCE = 3mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 3mA V I O Maximum Output Current ±3 ± ±3 ± ma V S = 3.3V, V CM =.V, V OT =.V, C T A 7 C, unless otherwise noted. (Note 9) LT121AC LT121C/LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv Input Voltage Range (Note 1) V V Maximum Output Voltage Swing Output High, No Load V Output High, I SORCE = 1mA V Output High, I SORCE = 2mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 2mA V V S = 3.3V, V CM =.V, V OT =.V, 4 C T A 8 C, unless otherwise noted. (Notes 4, 9) LT121AC LT121C/LT1216C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv Input Voltage Range (Note 1) V.2.2 V Maximum Output Voltage Swing Output High, No Load V Output High, I SORCE = 1mA V Output High, I SORCE = 2mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 2mA V V S = 3.3V, V CM =.V, V OT =.V, C T A 12 C, unless otherwise noted. (Note 9) LT121AM LT121M SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V OS Input Offset Voltage µv Input Voltage Range (Note 1) V V Maximum Output Voltage Swing Output High, No Load V Output High, I SORCE = 1mA V Output High, I SORCE = 2mA V Output Low, No Load V Output Low, I SINK = 1mA V Output Low, I SINK = 2mA V 7

8 ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 3: The LT121C/LT1216C are guaranteed functional over the operating temperature range of 4 C to 8 C. The LT121M is guaranteed functional over the operating temperature range of C to 12 C. Note 4: The LT121C/LT1216C are guaranteed to meet specified performance from C to 7 C. The LT121C/LT1216C are designed, characterized and expected to meet specified performance from 4 C to 8 C but are not tested or QA sampled at these temperatures. For guaranteed I-grade parts consult the factory. The LT121M is guaranteed to meet specified performance from C to 12 C. Note : T J is calculated from the ambient temperature T A and power dissipation P D according to the following formulas: LT121MJ8, LT121AMJ8: T J = T A + (P D 1 C/W) LT121CN8, LT121ACN8: T J = T A + (P D 1 C/W) LT121CS8: T J = T A + (P D 1 C/W) LT1216CN: T J = T A + (P D 7 C/W) LT1216CS: T J = T A + (P D 1 C/W) Note 6: This parameter is not 1% tested. Note 7: Guaranteed by correlation to 3.3V and ±1V tests. Note 8: Slew rate is measured between ±8.V on an output swing of ±1V on ±1V supplies. Note 9: Most LT121/LT1216 electrical characteristics change very little with supply voltage. See the V tables for characteristics not listed in the 3.3V table. Note 1: Guaranteed by correlation to V and ±1V tests. Note 11: Guaranteed by correlation to 3.3V tests. TYPICAL PERFOR PERCENT OF NITS (%) PERCENT OF NITS (%) A W LT121 N8 PACKAGE LT121 J8 PACKAGE INPT OFFSET VOLTAGE (µv) /16 G4 CE CHARACTERISTICS Distribution of Offset Voltage Drift Distribution of Input Offset Voltage with Temperature Distribution of Input Offset Voltage LT121 S8 PACKAGE LT1216 N PACKAGE LT1216 S PACKAGE INPT OFFSET VOLTAGE (µv) 121/16 G7 PERCENT OF NITS (%) PERCENT OF NITS (%) OFFSET VOLTAGE DRIFT WITH TEMPERATRE (µv/ C) LT121 N8 PACKAGE LT121 J8 PACKAGE 121/16 G LT121 S8 PACKAGE LT1216 N PACKAGE LT1216 S PACKAGE OFFSET VOLTAGE DRIFT WITH TEMPERATRE (µv/ C) 121/16 G8 PERCENT OF NITS (%) PERCENT OF NITS (%) INPT OFFSET VOLTAGE (µv) LT121 N8 PACKAGE LT121 J8 PACKAGE Distribution of Offset Voltage Drift Distribution of Input Offset Distribution of Input Offset Voltage with Temperature Voltage 121/16 G6 LT121 S8 PACKAGE LT1216 N PACKAGE LT1216 S PACKAGE INPT OFFSET VOLTAGE (µv) 121/16 G9

9 TYPICAL PERFOR A W CE CHARACTERISTICS VOLTAGE GAIN (db) Voltage Gain, Phase vs Gain-Bandwidth Product, Voltage Gain vs Frequency Frequency Phase Margin vs Supply Voltage C L = 2pF R L = 2k 1 1 1k 1k 1k 1M 1M 1M FREQENCY (Hz) 121/16 G1 VOLTAGE GAIN (db) GAIN C L = 2pF R L = 2k 2 1k PHASE 4 6 1M 1M 1M FREQENCY (Hz) 121/16 G PHASE SHIFT (DEG) GAIN-BANDWIDTH PRODCT (MHz) T A = C T A = 2 C T A = 12 C T A = 2 C, 12 C 6 T A = C TOTAL SPPLY VOLTAGE (V) 121/16 G12 PHASE MARGIN (DEG) SLEW RATE (V/µs) Slew Rate vs Temperature Slew Rate vs Supply Voltage Capacitive Load Handling T A = 2 C A V = 2 R L = 1k SLEW RATE (V/µs) A V = 2 R L = 1k T A = 12 C T A = 2 C T A = C OVERSHOOT (%) A V = 1 A V = A V = TEMPERATRE ( C) /16 G TOTAL SPPLY VOLTAGE (V) 121/16 G CAPACITIVE LOAD (pf) 1216/ G1 OTPT SWING (V P-P ) k ndistorted Output Swing ndistorted Output Swing Total Harmonic Distortion and vs Frequency, vs Frequency, Noise vs Frequency A V = 1 A V = 1 1k 1k 1M FREQENCY (Hz) 121/16 G16 OTPT SWING (V P-P ) k A V = 1 A V = 1 1k 1k 1M FREQENCY (Hz) 121/16 G17 TOTAL HARMONIC DISTORTION AND NOISE (%) V O = 3V P-P R L = 1k A V = 1 A V = k 1k 1k FREQENCY (Hz) 121/16 G18 9

10 TYPICAL PERFOR A W CE CHARACTERISTICS OPEN-LOOP VOLTAGE GAIN (V/mV) 7k 6k k 4k 3k 2k 1k Open-Loop Voltage Gain Positive Output Saturation vs Supply Voltage Open-Loop Gain, Voltage vs Temperature R L = 2k T A = C T A = 2 C T A = 12 C TOTAL SPPLY VOLTAGE (V) 121/16 G19 INPT, µv/div R L = 2k R L = Ω OTPT (V) 121/16 G2 SATRATION VOLTAGE, V + V OT (V) I SORCE = 1µA TEMPERATRE ( C) I SORCE = 3mA I SORCE = 1mA I SORCE = 1mA 121/16 G21 OPEN-LOOP VOLTAGE GAIN (V/mV) CHANNEL SEPARATION (db) 1k 1k Negative Output Saturation Voltage Gain vs Load Resistance Open-Loop Gain, Voltage vs Temperature T A = 2 C 1 1k 1k LOAD RESISTANCE (Ω) 121/16 G22 Output Short-Circuit Current Channel Separation vs Frequency vs Temperature Output Impedance vs Frequency T A = 2 C 3 1k 1k 1M 1M FREQENCY (Hz) 121/16 G2 INPT, µv/div R L = 2k OTPT SHORT-CIRCIT CRRENT (ma) R L = Ω OTPT (V) 3 SINKING OR SORCING SORCING CASE TEMPERATRE ( C) 121/16 G23 121/16 G26 SATRATION VOLTAGE, V OT V (mv) OTPT IMPEDANCE (Ω) k TEMPERATRE ( C) A V = 1 I SINK = 3mA I SINK = 1mA I SINK = 1mA I SINK = 1µA A V = 1 A V = 1 121/16 G24 1k 1M 1M FREQENCY (Hz) 121/16 G27 1

11 TYPICAL PERFOR A W CE CHARACTERISTICS V Small-Signal Response V Large-Signal Response V Large-Signal Response 3V 3V 2mV/DIV V V A V = 1 ns/div 121/16 G34 A V = 1 2ns/DIV 121/16 G28 A V = 1 R F = R G = 1k C F = 2pF 1ns/DIV 121/16 G31 ±1V Small-Signal Response ±1V Large-Signal Response ±1V Large-Signal Response 2mV/DIV 1V V 1V 1V V 1V A V = 1 ns/div 121/16 G34 A V = 1 2ns/DIV 121/16 G29 A V = 1 R F = R G = 1k 2ns/DIV 121/16 G32 V Settling ±1V Settling 1 8 Settling Time to.1% vs Output Step 6 mv/div 2µV/DIV 2V/DIV 1mV/DIV OTPT STEP (V) NONINVERTING INVERTING A V = 1 ns/div 121/16 G3 A V = 1 1ns/DIV 121/16 G SETTLING TIME (ns) 121/16 G36 11

12 TYPICAL PERFOR A W CE CHARACTERISTICS Supply Current vs Supply Voltage Supply Current vs Temperature Warm-p Drift vs Time SPPLY CRRENT PER AMPLIFIER (ma) T A = 12 C T A = 2 C T A = C SPPLY CRRENT PER AMPLIFIER (ma) CHANGE IN OFFSET VOLTAGE (µv) V S = ±2.V R L = 4 TYPICAL AMPLIFIERS SPPLY VOLTAGE (V) 121/16 G TEMPERATRE ( C) /16 G TIME AFTER POWER-P (SEC) 121/16 G3 INPT BIAS CRRENT (na) Input Bias Current vs Common Mode Range Input Bias Current vs Temperature Common Mode Voltage vs Temperature I B I OS 3 I B INPT BIAS CRRENT (na) T A = 12 C T A = 2 C T A = C COMMON-MODE RANGE (V) V + V + 1 V + 2 V +1 V TEMPERATRE ( C) COMMON-MODE VOLTAGE (V) V TEMPERATRE ( C) 121/16 G37 121/16 G38 121/16 G39 INPT NOISE CRRENT DENSITY (pa/ Hz) INPT NOISE VOLTAGE DENSITY (nv/ Hz) Input Noise Current, Noise Common Mode Rejection Ratio Input Referred Power Supply Voltage Density vs Frequency vs Frequency Rejection Ratio vs Frequency T A = 2 C R S = Ω VOLTAGE NOISE CRRENT NOISE 1 1 1k 1k 1k FREQENCY (Hz) 121/16 G4 COMMON-MODE REJECTION RATIO (db) k 1k 1M 1M FREQENCY (Hz) 121/16 G41 POWER SPPLY REJECTION RATIO (db) NEGATIVE SPPLY A V = 1 POSITIVE SPPLY 2 1k 1k 1k 1M 1M FREQENCY (Hz) 121/16 G42 12

13 APPLICATI O S I FOR W ATIO Supply Voltage The LT121/LT1216 op amps are fully functional and all internal bias circuits are in regulation with 2.2V of supply. The amplifiers will continue to function with as little as 1.V, although the input common mode range and the phase margin are about gone. The minimum operating supply voltage is guaranteed by the PSRR tests which are done with the input common mode equal to mv and a minimum supply voltage of 2.V. The LT121/LT1216 are guaranteed over the full C to 12 C range with a minimum supply voltage of 2.7V. The positive supply pin of the LT121/LT1216 should be bypassed with a small capacitor (about.1µf) within an inch of the pin. When driving heavy loads and for good settling time, an additional 4.7µF capacitor should be used. When using split supplies, the same is true for the negative supply pin. Power Dissipation The LT121/LT1216 amplifiers combine high speed and large output current drive into very small packages. Because these amplifiers work over a very wide supply range, it is possible to exceed the maximum junction temperature under certain conditions. To insure that the LT121/ LT1216 are used properly, calculate the worst case power dissipation, define the maximum ambient temperature, select the appropriate package and then calculate the maximum junction temperature. The worst case amplifier power dissipation is the total of the quiescent current times the total power supply voltage plus the power in the IC due to the load. The quiescent supply current of the LT121/LT1216 has a positive temperature coefficient. The maximum supply current of each amplifier at 12 C is given by the following formula: I SMAX = (V S ) in ma V S is the total supply voltage. The power in the IC due to the load is a function of the output voltage, the supply voltage and load resistance. The worst case occurs when the output voltage is at half supply, if it can go that far, or its maximum value if it cannot reach half supply. LT121/LT1216 For example, calculate the worst case power dissipation while operating on ±1V supplies and driving a Ω load. I SMAX = (3 ) = 1.3mA P DMAX = 2 V S I SMAX + (V S V OMAX ) V OMAX /R L P DMAX = 2 1V 1.3mA + (1V 7.V) 7.V/ = =.422 Watt per Amp If this is the dual LT121, the total power in the package is twice that, or.844w. Now calculate how much the die temperature will rise above the ambient. The total power dissipation times the thermal resistance of the package gives the amount of temperature rise. For this example, in the SO-8 surface mount package, the thermal resistance is 1 C/W junction-to-ambient in still air. Temperature Rise = P DMAX θ JA =.844W 1 C/W = C The maximum junction temperature allowed in the plastic package is 1 C. Therefore the maximum ambient allowed is the maximum junction temperature less the temperature rise. Maximum Ambient = 1 C C = 23.4 C That means the SO-8 dual can only be operated at or below room temperature on ±1V supplies with a Ω load. Obviously this is not recommended. Lowering the supply voltage is recommended, or use the DIP packaged part. As a guideline to help in the selection of the LT121/ LT1216, the following table describes the maximum supply voltage that can be used with each part based on the following assumptions: 1. The maximum ambient is 7 C or 12 C depending on the part rating. 2. The load is Ω, includes the feedback resistors. 3. The output can be anywhere between the supplies. PART MAX SPPLIES MAX POWER AT MAX T A LT121MJ8 1.V or ±1.3V mw LT121CN8 2.3V or ±14.V 8mW LT121CS8 1.7V or ±1.8V 33mW LT1216CN 16.4V or ±11.4V 1143mW LT1216CS 13.V or ±8.7V 8mW 13

14 APPLICATI O S I FOR W ATIO Inputs Typically at room temperature, the inputs of the LT121/ LT1216 can common mode 4mV below ground (V ) and to within 1.V of the positive supply with the amplifier still functional. However the input bias current and offset voltage will shift as shown in the characteristic curves. For full precision performance, the common mode range should be limited between ground (V ) and 2V below the positive supply. When either of the inputs is taken below ground (V ) by more than about 7mV, that input current will increase dramatically. The current is limited by internal 1Ω resistors between the input pins and diodes to each supply. The output will remain low (no phase reversal) for inputs 1.3V below ground (V ). If the output does not have to sink current, such as in a single supply system with a 1k load to ground, there is no phase reversal for inputs up to 8V below ground. There are no clamps across the inputs of the LT121/ LT1216 and therefore each input can be forced to any voltage between the supplies. The input current will remain constant at about 36nA over most of this range. When an input gets closer than 2V to the positive supply, that input current will gradually decrease to zero until the input goes above the supply, then it will increase due to the previously mentioned diodes. If the inverting input is held more positive than the noninverting input by 2mV or more, while at the same time the noninverting input is within 3mV of ground (V ), then the supply current will increase by ma and the noninverting input current will increase to about 1µA. This should be kept in mind in comparator applications where the inverting input stays above ground (V ) and the noninverting input does not. Output The output of the LT121/LT1216 will swing to within.61v of the positive supply with no load. The open-loop output resistance, when the output is driven hard into the positive rail, is about 1Ω as the output starts to source current; this resistance drops to about 2Ω as the current increases. Therefore when the output sources 1mA, the output will swing to within.7v of the positive supply. While sourcing 3mA, it is within 1.2V of the positive supply. The output of the LT121/LT1216 will swing to within mv of the negative supply while sinking zero current. Thus, in a typical single supply application with the load going to ground, the output will go to within mv of ground. The open-loop output resistance when the output is driven hard into the negative rail is about 2Ω at low currents and reduces to about 21Ω at high currents. Therefore when the output sinks 1mA, the output is about 3mV above the negative supply and while sinking 3mA, it is about 63mV above it. The output of the LT121/LT1216 has reverse-biased diodes to each supply. If the output is forced beyond either supply, unlimited currents will flow. If the current is transient and limited to several hundred ma, no damage will occur. Feedback Components Because the input currents of the LT121/LT1216 are less than 6nA, it is possible to use high value feedback resistors to set the gain. However, care must be taken to insure that the pole that is formed by the feedback resistors and the input capacitance does not degrade the stability of the amplifier. For example, if a single supply, noninverting gain of two is set with two 1k resistors, the LT121/LT1216 will probably oscillate. This is because the amplifier goes open-loop at 7MHz (6dB of gain) and has of phase margin. The feedback resistors and the 1pF input capacitance generate a pole at 3MHz that introduces 67 of phase shift at 7MHz! The solution is simple, lower the values of the resistors or add a feedback capacitor of 1pF or more. 14

15 APPLICATI O S I FOR W ATIO Comparator Applications Sometimes it is desirable to use an op amp as a comparator. When operating the LT121/LT1216 on a single 3.3V or V supply, the output interfaces directly with most TTL and CMOS logic. The response time of the LT121/LT1216 is a strong function of the amount of input overdrive as shown in the following photos. These amplifiers are unity-gain stable op amps and not fast comparators, therefore, the logic being driven may oscillate due to the long transition time. The output can be speeded up by adding 2mV or more of hysteresis (positive feedback), but the offset is then a function of the input direction. LT121 Comparator Response (+) 2mV, 1mV, mv, 2mV Overdrives LT121 Comparator Response ( ) 2mV, 1mV, mv, 2mV Overdrives 4 4 OTPT (V) INPT (mv) 2 1 INPT (mv) OTPT (V) 2 1 R L = µs/div 121/16 AI1 R L = µs/div 121/16 AI2 SI W PLII F ED SCHE W ATIC V + I 1 I 2 I 3 I 4 I I 6 C M BIAS Q13 Q3 Q4 Q14 Q1 IN Q1 Q2 +IN Q11 OT Q7 Q8 Q1 C F R F Q12 Q16 Q9 Q Q6 I 7 C O I 8 C I V 121/16 SS 1

16 TYPICAL APPLICATIO Single Supply, AC Coupled Input, RMS Calibrated, Average Detector AC TO DC BIASED DIFFERENTIAL SIGNAL 2k V DIFFERENTIAL INPT, ABSOLTE VALE CIRCIT 22pF 1 DC OTPT VOLTAGE vs AC INPT VOLTAGE V IN 1µF 1k + 1k + A LT k 22pF D LT k V B V A R1 1k R1 1k R1 1k R1 1k 2 R2 2k R2 2k B LT1216 R2 1k C LT1216 R2 1k DC OT (mv) R2 R1 V A V B 1k f = 1kHz f = 1kHz 1 1 AC IN (mv RMS ) + DC OT 1µF 121/16 GA6 22pF 121/16 TA 22pF 16

17 PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow.3 Inch, Hermetic) (Reference LTC DWG # ).4.68 ( ) FLL LEAD OPTION.3 BSC (.762 BSC) CORNER LEADS OPTION (4 PLCS).23.4 ( ) HALF LEAD OPTION. (.127) MIN.2 (.63) RAD TYP.4 (1.287) MAX ( ).2 (.8) MAX.1.6 ( ).8.18 (.23.47) 1 NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS.4.6 ( ) (.36.66).1 (2.4) BSC MIN J OBSOLETE PACKAGE 17

18 PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow.3 Inch) (Reference LTC DWG # -8-11).4* (1.16) MAX ±.1* (6.477 ±.381) ( ).4.6 ( ).13 ±. (3.32 ±.127).9.1 ( ) ( ).6 (1.61) TYP.1 (2.4) BSC *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED.1 INCH (.24mm).12 (3.17) MIN.18 ±.3 (.47 ±.76).2 (.8) MIN N8 198 N Package 14-Lead PDIP (Narrow.3 Inch) (Reference LTC DWG # -8-11).77* (19.8) MAX ±.1* (6.477 ±.381) ( ).13 ±. (3.32 ±.127).4.6 ( ) ( ) ( ).2 (.8) MIN.12 (3.17) MIN. (.12) MIN *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED.1 INCH (.24mm).1 (2.4) BSC.6 (1.61) TYP.18 ±.3 (.47 ±.76) N14 198

19 PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow.1 Inch) (Reference LTC DWG # ) * (4.81.4) ( ).1.17** ( ) (.23.24).1.2 (.24.8) 4 8 TYP.3.69 ( ).4.1 (.11.24).16. ( ) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.12mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED.1" (.24mm) PER SIDE (.3.483) TYP. (1.27) BSC SO S Package 16-Lead Plastic Small Outline (Narrow.1 Inch) (Reference LTC DWG # ) * ( ) ( ).1.17** ( ).8.1 (.23.24).1.2 (.24.8) 4 8 TYP.3.69 ( ) (.11.24).16. ( ) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.12mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED.1" (.24mm) PER SIDE (.3.483) TYP. (1.27) BSC Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. S

20 TYPICAL APPLICATIO LT1216 Photo Diode Amplifier V TRANSIENT RESPONSE 2V + 1/4 LT1216 V OT.1k 8pF 121/16 TA3 I TO V BANDWIDTH = 7MHz 121/16 TA RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT1211/LT1212 Dual/Quad 14MHz, 7V/µs Single Supply Precision Op Amps Input Common Mode Includes Ground, 27µV V OS (Max), 6µV/ C Max Drift, 1.8mA Max Supply Current per Amplifier LT1213/LT1214 Dual/Quad 28MHz, 12V/µs Single Supply Precision Op Amps Input Common Mode Includes Ground, 27µV V OS (Max), 6µV/ C Max Drift, 3.mA Max Supply Current per Amplifier LT1498/LT1499 1MHz, 6V/µs, Dual/Quad Rail-to-Rail Input and 47µV V OS (Max), 2.2mA Max Supply Current per Amplifier, Output Precision C-Load TM Op Amps 2.µV/ C Max Drift, Stable with Capacitive Loads to 1,pF LT1124/LT MHz, 4.V/µs, Dual/Quad Low Noise, 7µV V OS (Max), 2.7mA Max Supply Current per Amplifier, High Speed Precision Op Amps 1µV/ C Max Drift LT13/LT136 Dual and Quad 12MHz, 4V/µs Op Amps 1.2mA Max Supply Current per Amplifier, 8µV V OS (Max), Drives All Capacitive Loads LT138/LT139 Dual and Quad 2MHz, 6V/µs Op Amps 2.mA Max Supply Current per Amplifier, 6µV V OS (Max), Drives All Capacitive Loads LT1361/LT1362 Dual and Quad MHz, 8V/µs Op Amps ma Max Supply Current per Amplifier, 1mV V OS (Max), Drives All Capacitive Loads C-Load is a trademark of Linear Technology Corporation. 2 Linear Technology Corporation 163 McCarthy Blvd., Milpitas, CA (48) FAX: (48) fb LT/TP K REV B PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 1993