APPLICATIO S TYPICAL APPLICATION

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1 FEATRES Gain of 5 Stable Low Supply Current: 2µA Max per Amplifier Rail-to-Rail Input and Output Low Offset Voltage: 375µV Max Over-The-Top TM Inputs Operate Above V Gain Bandwidth Product: 2kHz Wide Supply Range: 2.2V to 36V Single Supply Input Range:.3V to 36V Low Input Bias Current: 25pA Low Input Offset Current: 2pA High A VOL : V/mV Minimum Driving kω Load Output Sources and Sinks 5µA Load Current Reverse Battery Protected to V APPLICATIO S Battery- or Solar-Powered Systems Portable Instrumentation Remote Sensor Amplifier Micropower Filter Photodiode Amplifier High Impedance Circuits, LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. DESCRIPTIO LT672/LT673/LT674 2µA Max, A V 5 Single, Dual and Quad Over-The-Top Precision Rail-to-Rail Input and Output Op Amps The LT 672/LT673/LT674 are ultralow power (I S 2µA) decompensated (A V 5) op amps with precision specifications. The extremely low supply current is combined with excellent amplifier specifications: input offset voltage is 375µV maximum with a typical drift of only.4µv/ C, input offset current is pa maximum. A minimum open-loop gain (A VOL ) of V/mV ensures that gain errors are small. The devices characteristics change little over the supply range of 2.2V to ±5V. Supply rejection is 9dB and the common mode rejection ratio is 9dB. Operation is specified for 3V, 5V and ±5V supplies. Reverse battery protection (V min) and inputs that operate above the positive supply make the LT672/ LT673/LT674 easy to use in harsh environments. The low bias currents and offset current of the amplifier permit the use of megohm level source resistors without introducing significant errors. Voltage noise at 4µV P-P is remarkably low considering the low supply current. For unity gain stable versions of these amplifiers, see the LT494/LT495/LT496. The LT672 is available in the -pin MSOP, PDIP and SO packages. The LT673 is available in plastic -pin PDIP and SO- packages with the standard dual op amp pinout. The LT674 is available in 4-pin PDIP and SO packages. TYPICAL APPLICATION V IN V IN2 k pf k k* k* Single Supply, 6µW Precision Instrumentation Amplifier 5V /2 LT673 /2 LT673 k k.47µf 5V LT672 V OT 5V LT /3/4 TA A V = BANDWIDTH = khz CMRR = 65dB AT 2Hz *5V TRANSIENT PROTECTION TOTAL SPPLY CRRENT = 2µA NITS AMPLIFIERS 4 C to 5 C TC V OS Distribution TC V OS (µv/ C) 672/3/4 TA2

2 ABSOLTE AXI RATI GS W W W Total Supply Voltage (V to V )... 36V Differential Input Voltage... 36V Input Current... ±ma Output Short-Circuit Duration...Continuous Operating Temperature Range (Note 2).. 4 C to 5 C W PACKAGE/ORDER I FOR ATIO (Note ) Specified Temperature Range (Note 3)... 4 C to 5 C Storage Temperature Range C to 5 C Junction Temperature... 5 C Lead Temperature (Soldering, sec)... 3 C ORDER PART NMBER TOP VIEW ORDER PART NMBER NC IN IN V TOP VIEW NC 7 V 6 OT 5 NC MS PACKAGE -LEAD PLASTIC MSOP T JMAX = 5 C, θ JA = 25 C/ W LT672CMS LT672IMS MS PART MARKING LTFH LTFJ NC IN 2 IN 3 V 4 N PACKAGE -LEAD PDIP NC V OT NC S PACKAGE -LEAD PLASTIC SO T JMAX = 5 C, θ JA = 3 C/ W (N) T JMAX = 5 C, θ JA = 9 C/ W (S) LT672CN LT672CS LT672IN LT672IS S PART MARKING I OT A IN A IN A V A N PACKAGE -LEAD PDIP TOP VIEW V OT B IN B IN B S PACKAGE -LEAD PLASTIC SO T JMAX = 5 C, θ JA = 5 C/ W (N) T JMAX = 5 C, θ JA = 9 C/ W (S) B ORDER PART NMBER LT673CN LT673CS LT673IN LT673IS S PART MARKING I OT A IN A 2 IN A 3 V 4 IN B 5 IN B 6 OT B 7 N PACKAGE 4-LEAD PDIP TOP VIEW A B 4 3 OT D IN D D C 2 9 IN D V IN C IN C OT C S PACKAGE 4-LEAD PLASTIC SO T JMAX = 5 C, θ JA = C/ W (N) T JMAX = 5 C, θ JA = 5 C/ W (S) ORDER PART NMBER LT674CN LT674CS LT674IN LT674IS Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS T A = 25 C, V S = 5V, V; V S = 3V, V; V CM = V O = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage V S = 5V µv V S = 3V µv V S = 5V, MS Package µv V S = 3V, MS Package µv I B Input Bias Current (Note 5) 25 pa V CM = V (Note 6) 36 na I OS Input Offset Current (Note 5) 2 pa Input Noise Voltage.Hz to Hz 4 µv P-P 2

3 ELECTRICAL CHARACTERISTICS T A = 25 C, V S = 5V, V; V S = 3V, V; V CM = V O = half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS e n Input Noise Voltage Density f = Hz 5 nv/ Hz i n Input Noise Current Density f = Hz fa/ Hz A VOL Large-Signal Voltage Gain V S = 5V, V O =.25V to 4.5V, R L = k 5 V/mV V S = 3V, V O =.25V to 2.5V, R L = k 5 25 V/mV Input Voltage Range 36 V CMRR Common Mode Rejection Ratio V CM = V to 4V, V S = 5V 9 6 db V CM = V to V, V S = 5V db PSRR Power Supply Rejection Ratio V S = 2.2V to 2V, V CM = V O =.5V 9 99 db Minimum Operating Supply Voltage V V OL Output Voltage Swing LOW No Load 5 mv I SINK = µa 2 4 mv V OH Output Voltage Swing HIGH No Load V.7 V.35 V I SORCE = µa V.32 V.6 V I SC Short-Circuit Current (Note 5).7.3 ma I S Supply Current per Amplifier (Note 6).5 2 µa Reverse Supply Voltage I S = µa per Amplifier V SR Slew Rate A V = 5, V S = ±V.6 5 V/ms GBW Gain Bandwidth Product f = Hz 2 khz The denotes the specifications which apply over the temperature range of C T A 7 C. V S = 5V, V; V S = 3V, V; V CM = V O = half supply, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage V S = 5V µv V S = 3V µv V S = 5V, MS Package µv V S = 3V, MS Package µv V OS TC Input Offset Voltage Drift (Note 4).4 2 µv/ C I B Input Bias Current (Note 5) 25 2 pa V CM = V (Note 6) 24 5 na I OS Input Offset Current (Note 5) 2 2 pa A VOL Large-Signal Voltage Gain V S = 5V, V O =.25V to 4.5V, R L = k 75 2 V/mV V S = 3V, V O =.25V to 2.5V, R L = k 4 5 V/mV Input Voltage Range.2 36 V CMRR Common Mode Rejection Ratio V CM =.2V to 4V, V S = 5V 9 6 db V CM =.2V to V, V S = 5V 64 5 db PSRR Power Supply Rejection Ratio V S = 2.4V to 2V, V CM = V O =.5V 9 99 db Minimum Operating Supply Voltage V V OL Output Voltage Swing LOW No Load 55 mv I SINK = µa mv V OH Output Voltage Swing HIGH No Load V. V.4 V I SORCE = µa V.36 V. V I SC Short-Circuit Current (Note 5).6. ma I S Supply Current per Amplifier (Note 6).9 2. µa 3

4 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the temperature range of 4 C T A 5 C. V S = 5V, V; V S = 3V, V; V CM = V O = half supply, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage V S = 5V µv V S = 3V µv V S = 5V, MS Package µv V S = 3V, MS Package µv V OS TC Input Offset Voltage Drift (Note 4).4 2 µv/ C I B Input Bias Current (Note 5) 25 7 pa V CM = V (Note 6) na I OS Input Offset Current (Note 5) 2 7 pa A VOL Large-Signal Voltage Gain V S = 5V, V O =.25V to 4.5V, R L = k V/mV V S = 3V, V O =.25V to 2.5V, R L = k 3 5 V/mV Input Voltage Range.2 36 V CMRR Common Mode Rejection Ratio V CM =.2V to 4V, V S = 5V 6 db V CM =.2V to V, V S = 5V db PSRR Power Supply Rejection Ratio V S = 2.7V to 2V, V CM = V O =.5V 99 db Minimum Operating Supply Voltage V V OL Output Voltage Swing LOW No Load 6 2 mv I SINK = µa mv V OH Output Voltage Swing HIGH No Load V. V.5 mv I SORCE = µa V.3 V.9 mv I SC Short-Circuit Current (Note 5).4.9 ma I S Supply Current per Amplifier (Note 6) µa T A = 25 C, V S = ±5V, V CM = V O = V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage µv MS Package µv I B Input Bias Current 25 pa I OS Input Offset Current 2 pa A VOL Large-Signal Voltage Gain V O = ±V, R L = k 36 V/mV Input Voltage Range 5 2 V CMRR Common Mode Rejection Ratio V CM = 5V to 4V 2 db PSRR Power Supply Rejection Ratio V S = ±5V to ±5V 96 2 db V OL Output Voltage Swing LOW R L = V R L = k V V OH Output Voltage Swing HIGH R L = V R L = k V I SC Short-Circuit Current.7.5 ma I S Supply Current per Amplifier.9 2. µa 4

5 ELECTRICAL CHARACTERISTICS LT672/LT673/LT674 The denotes the specifications which apply over the temperature range of C T A 7 C, V S = ±5V, V CM = V O = V, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage µv MS Package µv I B Input Bias Current 25 2 pa I OS Input Offset Current 2 2 pa A VOL Large-Signal Voltage Gain V O = ±V, R L = k 6 24 V/mV Input Voltage Range 4. 2 V CMRR Common Mode Rejection Ratio V CM = 4.V to 4V 9 2 db PSRR Power Supply Rejection Ratio V S = ±5V to ±5V 94 2 db V OL Output Voltage Swing LOW R L = V R L = k V V OH Output Voltage Swing HIGH R L = V R L = k mv I SC Short-Circuit Current.6.3 ma I S Supply Current per Amplifier µa The denotes the specifications which apply over the temperature range of 4 C T A 5 C, V S = ±5V, V CM = V O = V, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage µv MS Package µv I B Input Bias Current 25 7 pa I OS Input Offset Current 2 7 pa A VOL Large-Signal Voltage Gain V O = ±V, R L = k 5 2 V/mV Input Voltage Range 4. 2 V CMRR Common Mode Rejection Ratio V CM = 4.V to 4V 96 4 db PSRR Power Supply Rejection Ratio V S = ±5V to ±5V 92 2 db V OL Output Voltage Swing LOW R L = V R L = k V V OH Output Voltage Swing HIGH R L = V R L = k V I SC Short-Circuit Current.4. ma I S Supply Current per Amplifier µa Note : Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The LT672C/LT673C/LT674C and LT672I/LT673I/LT674I are guaranteed functional over the Operating Temperature Range of 4 C to 5 C. Note 3: The LT672C/LT673C/LT674C are guaranteed to meet specified performance from C to 7 C. The LT672C/LT673C/LT674C are designed, characterized and expected to meet specified performance from 4 C to 5 C but are not tested or QA sampled at these temperatures. The LT672I/LT673I/LT674I are guaranteed to meet specified performance from 4 C to 5 C. Note 4: This parameter is not % tested. Note 5: V S = 5V limit guaranteed by correlation to V S = 3V and V S = ±5V tests. Note 6: V S = 3V limit guaranteed by correlation to V S = 5V and V S = ±5V tests. 5

6 TYPICAL PERFORMANCE CHARACTERISTICS W PERCENT OF NITS (%) Distribution of Input Offset Voltage Supply Current vs Temperature Minimum Supply Voltage V S = 5V, V LT672/73/74 56 AMPLIFIERS INPT OFFSET VOLTAGE (µv) 672/73/74 G SPPLY CRRENT PER AMPLIFIER (µa) V S = ±5V TEMPERATRE ( C) /3/4 G2 CHANGE IN OFFSET VOLTAGE (µv) T A = 5 C T A = 25 C T A = 4 C TOTAL SPPLY VOLTAGE (V) 5 672/3/4 G3 Output Saturation Voltage vs Load Current (Output Low) V S = 5V, V Output Saturation Voltage vs Load Current (Output High) V S = 5V, V 3 Input Bias Current vs Common Mode Voltage V S = 5V, V T A = 5 C SATRATION VOLTAGE (mv) T A = 5 C T A = 4 C T A = 25 C SATRATION VOLTAGE (mv) T A = 5 C T A = 4 C T A = 25 C INPT BIAS CRRENT (na) T A = 4 C T A = 25 C T A = 4 C T A = 25 C T A = 5 C. LOAD CRRENT (µa). LOAD CRRENT (µa) COMMON MODE VOLTAGE (V) 672/3/4 G4 672/3/4 G5 672/3/4 G6 VOLTAGE GAIN (db) Gain and Phase Shift vs Frequency 2 PHASE GAIN k k FREQENCY (Hz) 672/3/4 G7 PHASE SHIFT (DEG) NOISE VOLTAGE (nv/ Hz) Noise Voltage Spectrum FREQENCY (Hz) 672/3/4 G CRRENT NOISE (fa/ Hz) Noise Current Spectrum FREQENCY (Hz) 672/3/4 G9 6

7 TYPICAL PERFORMANCE CHARACTERISTICS W FREQENCY (khz) Gain Bandwidth and Phase Margin vs Supply Voltage MEASRED AT A V = 5 PHASE MARGIN GBW PHASE MARGIN (DEG) OTPT VOLTAGE (2µV/DIV).Hz to Hz Output Voltage Noise V S = ±5V V CM = V OVERSHOOT (%) Capacitive Load Handling A V = A V = SPPLY VOLTAGE (V) TIME (s/div) k k CAPACITIVE LOAD (pf) 672/3/4 G 672/3/4 G7 672/3/4 G2 COMMON MODE REJECTIO RATIO (db) Common Mode Rejection Ratio vs Frequency k k 2k FREQENCY (Hz) 672/3/4 G3 POWER SPPLY REJECTION RATIO (db) Power Supply Rejection Ratio vs Frequency PSRR PSRR k k FREQENCY (Hz) 672/3/4 G4 OTPT IMPEDANCE (kω). Output Impedance vs Frequency A V = A V = 5 k k FREQENCY (Hz) 672/3/4 G5 OFFSET VOLTAGE CHANGE (µv) Warm-p Drift vs Time V S = ±5V TIME AFTER POWER-P (SEC) 672/3/4 G6 OFFSET VOLTAGE CHANGE (µv) Open-Loop Gain V S = 5V, V R L = k R L = V S = 5V, V OTPT VOLTAGE (V) 6 672/3/4 G7 OFFSET VOLTAGE CHANGE (µv) Open-Loop Gain V S = ±5V 2 5 R L = R L = k OTPT VOLTAGE (V) V S = ±5V 2 672/3/4 G 7

8 TYPICAL PERFORMANCE CHARACTERISTICS W Small-Signal Response Small-Signal Response Large-Signal Response V S = ±5V C L = pf A V = 5 V S = 5V C L = pf A V = 5 V S = 5V C L = pf A V = 5 672/3/4 G9 672/3/4 G2 672/3/4 G2 APPLICATIO S I FOR ATIO Start-p Characteristics Micropower op amps are sometimes not micropower during start-up, wreaking havoc on low current supplies. In the worst case, there may not be enough supply current available to take the system up to nominal voltages. Figure is a graph of LT673 supply current vs supply voltage for the three limit cases of input offset that could occur during start-up. The circuits are shown in Figure 2. One circuit creates a positive offset, forcing the output to come up saturated high. Another circuit creates a negative offset, forcing the output to come up saturated low, while the last brings up the output at half supply. In all cases, the supply current is well behaved. Supply current is highest with the output forced high, so if one amplifier is unused, it is best to force the output low or at half supply. SPPLY CRRENT PER AMPLIFIER (µa) W OTPT HIGH OTPT LOW OTPT V S / TOTAL SPPLY VOLTAGE (V) 672/3/4 FO Figure. Start-p Characteristics V V V 2k V OTPT HIGH Reverse Battery V V OTPT LOW 2k OTPT AT V S /2 Figure 2. Circuits for Start-p Characteristics 6/2/3/4 F2 The LT672/LT673/LT674 are protected against reverse battery voltages up to V. In the event a reverse battery condition occurs, the supply current is typically less than na (inputs grounded and outputs open). For typical single supply applications with ground referred loads and feedback networks, no other precautions are required. If the reverse battery condition results in a negative voltage at either the input pins or output pin, the current into the pin should be limited by an external resistor to less than ma. Inputs While the LT672/LT673/LT674 will function normally with its inputs taken above the positive supply, the common mode range does not extend beyond approximately 3mV below the negative supply at room temperature.

9 APPLICATIO S I FOR ATIO W The device will not be damaged if the inputs are taken lower than 3mV below the negative supply as long as the current out of the pin is limited to less than ma. However, the output phase is not guaranteed and the supply current will increase. Output The graph, Capacitive Load Handling, shows amplifier stability with the output biased at half supply. If the output is to be operated within about mv of the positive rail, the allowable load capacitance is less. With this output voltage, the worst case occurs at A V = 5 and light loads, where the load capacitance should be less than 5pF with a 5V supply and less than pf with a 3V supply. Rail-to-Rail Operation The simplified schematic, Figure 3, details the circuit design approach of the LT672/LT673/LT674. The amplifier topology is a three-stage design consisting of a rail-to-rail input stage, that continues to operate with the inputs above the positive rail, a folded cascode second stage that develops most of the voltage gain, and a rail-torail common emitter stage that provides the current gain. The input stage is formed by two diff amps Q-Q2 and Q3- Q6. For signals with a common mode voltage between V EE and (V CC.V), Q and Q2 are active. When the input common mode exceeds (V CC.V), Q7 turns on, diverting the current from diff amp Q-Q2 to current mirror Q-Q9. The current from Q biases on the other diff amp consisting of PNP s Q5-Q6 and NPN s Q3-Q4. Though Q5-Q6 are driven from the emitters rather than the base, the basic diff amp action is the same. When the common mode voltage is between (V CC.V) and V CC, devices Q3 and Q4 act as followers, forming a buffer between the amplifier inputs and the emitters of the Q5- Q6. If the common mode voltage is taken above V CC, Schottky diodes D and D2 reverse bias and devices Q3 and Q4 then act as diodes. The diff amp formed by Q5-Q6 operates normally, however, the input bias current increases to the emitter current of Q5-Q6, which is typically na. The graph, Input Bias Current vs Common Mode Voltage found in the Typical Performance Characteristics section, shows these transitions at three temperatures. The collector currents of the two-input pairs are combined in the second stage consisting of Q to Q6, which furnishes most of the voltage gain. Capacitor C sets the amplifier bandwidth. The output stage is configured for maximum swing by the use of common emitter output devices Q2 and Q22. Diodes D4 to D6 and current source Q5 set the output quiescent current. IN Q D D2 D3 Q3 Q4 C Q5 D7 I Q2 Q2 OT IN Q Q2 Q3 Q4 Q7 (V ).V Q6 Q7 Q9 Q5 Q6 Q Q2 D4 D5 D6 Q Q22 Q9 Q R R2 I 2 672/3/4 F3 Figure 3. Simplified Schematic 9

10 TYPICAL APPLICATIO S I L CHARGE Battery Current Monitor R SENSE.Ω Over-the-Top Comparator with Hysteresis A2 /2 LT673 DISCHARGE 2N394 R B R A R A DISCHARGE OT R A R A CHARGE OT 2N394 R B 5V A /2 LT673 ( ) 2V R V O = I B L R SENSE R A FOR R A = k, R B = k (R B /R A 5) V O = V/A I L 672/3/4 TA4 IN (V TO 2V) IN2 (V TO 2V) k k HYSTERESIS = I S < µa V CC 5V (V CC ) LT672 2N57 2N52 672/3/4 TA3 V OT PACKAGE DESCRIPTIO.7 (.).2 ±.6 (.53 ±.5) 6 TYP SEATING PLANE Dimensions in inches (millimeters) unless otherwise noted. MS Package -Lead Plastic MSOP (LTC DWG # 5--66).43 (.) MAX.9.5 (.22.3).256 (.65) BSC.34 (.6) REF.5 ±.2 (.3 ±.5) * DIMENSION DOES NOT INCLDE MOLD FLASH, PROTRSIONS OR GATE BRRS. MOLD FLASH, PROTRSIONS OR GATE BRRS SHALL NOT EXCEED.6" (.52mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH OR PROTRSIONS. INTERLEAD FLASH OR PROTRSIONS SHALL NOT EXCEED.6" (.52mm) PER SIDE. ±.4* (3. ±.2).93 ±.6 (4.9 ±.5) ±.4** (3. ±.2) MSOP (MS) ( ) (.43.65) N Package -Lead PDIP (Narrow.3) (LTC DWG # 5--5).3 ±.5 (3.32 ±.27).4* (.6) MAX (.229.3) ( ).65 (.65) TYP. (2.54) BSC *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.254mm).255 ±.5* (6.477 ±.3).25 (3.75) MIN.2 (.5) ±.3 (.457 ±.76) MIN N 9

11 PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S Package -Lead Plastic Small Outline (Narrow.5) (LTC DWG # 5--6).9.97* (4. 5.4) ( ).5.57** (3. 3.9) ( )..2 (.254.5) 45 TYP ( ).4. (..254).6.5 (.46.27) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.52mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.254mm) PER SIDE.4.9 ( ) TYP.5 (.27) BSC SO 29 S Package 4-Lead Plastic Small Outline (Narrow.5) (LTC DWG # 5--6) * (.56.73) ( ).5.57** (3. 3.9) ( )..2 (.254.5) 45 TYP ( ).4. (..254).6.5 (.46.27) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.52mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.254mm) PER SIDE.4.9 ( ) TYP.5 (.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. S4 29

12 TYPICAL APPLICATIO Micropower Photodiode Amplifier C 2pF nm IR PHOTODIODE λ OPTO-DIODE CORP ODD-45W I PHOTODIODE C D 7pF R V S LT672 V S V GAIN: A Z = Ω = OT I PHOTODIODE % TO 9% RISE TIME: t r = 26µs BANDWIDTH: BW =.7kHz V OT V S = ±.2V TO ±5V C, CD SATISFY GAIN OF 5 STABILITY REQIREMENT AT AC. 672/3/4 TA5 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LTC 44/4/42 Micropower Single/Dual Comparators with % Reference LTC44: Single, LTC44/42: Dual LTC443/LTC444/LTC445 Micropower Quad Comparators with % Reference LTC443:.2 Reference LTC444/45:.22V Reference and Adjustable Hysteresis LT466/LT467 75µA Dual/Quad Rail-to-Rail Input and Output Op Amps 39µV V OS(MAX), Gain Bandwidth = 2kHz LT49A/LT49A 5µA Dual/Quad Rail-to-Rail Input and Output Op Amps 95µV V OS(MAX), Gain Bandwidth = 2kHz LT494/LT495/LT496.5µA Max Single/Dual/Quad Over-the-Top nity Gain Stable Version of the LT672/LT673/LT674 Precision Rail-to-Rail Input and Output Op Amps LTC54 Nanopower Single Comparator with % Reference 35nA Supply Current LT636 Single Over-the-Top Micropower, Rail-to-Rail 225µV V OS(MAX), I S = 55µA (Max), Gain Bandwidth = 2kHz, Input and Output Op Amp Shutdown Pin, MSOP LT27/LT279 55µA Dual/Quad Single Supply Op Amps 2µV V OS(MAX), Gain Bandwidth = 2kHz LT27/LT279 7µA Dual/Quad Single Supply Op Amps 2µV V OS(MAX), Gain Bandwidth = 6kHz LT72 Micropower, Over-The-Top, SOT-23, Rail-to-Rail SOT-23, µv V OS(MAX), I S = 55µA (Max), Input and Output Op Amp Gain-Bandwidth = 2kHz, Shutdown Pin LT73.2MHz, Over-The-Top, Micropower, Rail-to-Rail SOT-23, µv V OS(MAX), I S = 3µA (Max), Input and Output Op Amp in SOT-23 Gain-Bandwidth =.2MHz, Shutdown Pin 2 Linear Technology Corporation 63 McCarthy Blvd., Milpitas, CA (4)432-9 FAX: (4) f LT/TP 4K PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 2

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