TYPICAL APPLICATION DESCRIPTIO

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1 .µa Max, Single, Dual and Quad Over-The-Top Precision Rail-to-Rail Input and Output Op Amps FEATRES Low Supply Current:.µA Max Rail-to-Rail Input and Output Low Offset Voltage: 37µV Max Operating Temperature Range: 4 C to 2 C Over-The-Top TM Inputs Operate Above V Wide Supply Range: 2.2V to 36V Single Supply Input Range:.3V to 36V Low Input Bias Current: 2pA Low Input Offset Current: 2pA High A VOL : V/mV Minimum Driving kω Load Output Sources and Sinks µa Load Current Reverse Battery Protected to 8V APPLICATIO S Battery- or Solar-Powered Systems Portable Instrumentation Remote Sensor Amplifier Micropower Filter, LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. DESCRIPTIO The LT 494/LT49/LT496 are the lowest power (I S.µA) op amps with precision specifications. The extremely low supply current is combined with excellent amplifier specifications: input offset voltage is 37µV 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 device characteristics change little over the supply range of 2.2V to ±V. Supply rejection is 9dB and the common mode rejection ratio is 9dB. Operation is specified for 3V, V and ±V supplies. Reverse battery protection (8V min) and inputs that operate above the positive supply make the LT494/LT49/LT496 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. The LT494 is available in the 8-Pin MSOP, PDIP and SO packages.the LT49 is available in plastic 8-Pin PDIP and SO packages with the standard dual op amp pinout. The LT496 is available in 4-Pin SO and PDIP packages. TYPICAL APPLICATION V CC R S.Ω I L Micropower Integrating Current Sense R I M M /2 LT49 RESET.µF /2 LT49 V O NITS TC V OS Distribution AMPLIFIERS 4 C TO 8 C LOAD V CC M M 49 TA 2k ( ) OTPT SWITCHES R WHEN I L dt =.98 V I CC C = (4.9A)(SEC) FOR V CC = V R S I S = 3µA DRING INTEGRATION; I S = µa END OF INTEGRATION TC V OS (µv/ C) 49 TA2

2 ABSOLTE MAXIMM RATINGS W W W (Note ) Total Supply Voltage (V to V )... 36V Differential Input Voltage... 36V Input Current... ±ma Output Short-Circuit Duration...Continuous Operating Temperature Range (Note 2) LT494C/LT49C/LT496C... 4 C to 8 C LT494I/LT49I/LT496I... 4 C to 8 C LT494H/LT49H/LT496H... 4 C to 2 C Specified Temperature Range (Note 3) LT494C/LT49C/LT496C... 4 C to 8 C LT494I/LT49I/LT496I... 4 C to 8 C LT494H/LT49H/LT496H... 4 C to 2 C Storage Temperature Range... 6 C to C Junction Temperature... C Lead Temperature (Soldering, sec)... 3 C PACKAGE/ORDER INFORMATION OT A IN A IN A V NC IN 2 IN 3 V A N8 PACKAGE 8-LEAD PDIP TOP VIEW TOP VIEW V OT B IN B IN B S8 PACKAGE 8-LEAD PLASTIC SO T JMAX = C, θ JA = 3 C/ W (N8) T JMAX = C, θ JA = 9 C/ W (S8) B 8 NC 7 V 6 OT NC MS8 PACKAGE 8-LEAD PLASTIC MSOP T JMAX = C, θ JA = 2 C/ W W ORDER PART NMBER LT494CMS8 LT494IMS8 MS8 PART MARKING LTFF LTFG ORDER PART NMBER LT49CN8 LT49CS8 LT49IN8 LT49IS8 LT49HS8 S8 PART MARKING 49 49I 49H Consult LTC Marketing for parts specified with wider operating temperature ranges. NC IN 2 IN 3 V 4 N8 PACKAGE 8-LEAD PDIP OT A IN A IN A V IN B IN B OT B A B N PACKAGE 4-LEAD PDIP TOP VIEW TOP VIEW OT D IN D IN D V IN C IN C OT C S PACKAGE 4-LEAD PLASTIC SO T JMAX = C, θ JA = 3 C/ W (N) T JMAX = C, θ JA = 6 C/ W (S) D C NC V OT NC S8 PACKAGE 8-LEAD PLASTIC SO T JMAX = C, θ JA = 3 C/ W (N8) T JMAX = C, θ JA = 9 C/ W (S8) ORDER PART NMBER LT494CN8 LT494CS8 LT494IN8 LT494IS8 LT494HS8 S8 PART MARKING I 494H ORDER PART NMBER LT496CN LT496CS LT496IN LT496IS LT496HS 2

3 ELECTRICAL CHARACTERISTICS T A = 2 C, V S = V, 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 = V 37 µv V S = 3V 2 47 µv V S = V, MS8 Package 47 µv V S = 3V, MS8 Package 2 7 µv I B Input Bias Current (Note ) 2 pa V CM = V (Note 6) 8 36 na I OS Input Offset Current (Note ) 2 pa Input Noise Voltage.Hz to Hz 4 µv P-P e n Input Noise Voltage Density f = Hz 8 nv/ Hz i n Input Noise Current Density f = Hz fa/ Hz A VOL Large-Signal Voltage Gain V S = V, V O =.2V to 4.V, R L = k V/mV V S = 3V, V O =.2V to 2.V, R L = k 2 V/mV Input Voltage Range 36 V CMRR Common Mode Rejection Ratio V CM = V to 4V, V S = V 9 6 db V CM = V to V, V S = V 74 9 db PSRR Power Supply Rejection Ratio V S = 2.2V to 2V, V CM = V O =.V 9 99 db Minimum Operating Supply Voltage V V OL Output Voltage Swing LOW No Load mv I SINK = µa 2 4 mv V OH Output Voltage Swing HIGH No Load V.7 V.3 V I SORCE = µa V.32 V.6 V I SC Short-Circuit Current (Note ).7.3 ma I S Supply Current per Amplifier (Note 6).. µa Reverse Supply Voltage I S = µa per Amplifier 8 V SR Slew Rate A V =, V S = ±V.4. V/ms GBW Gain Bandwidth Product f = Hz 2.7 khz 3

4 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the temperature range of C T A 7 C, V S = V, 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 = V 7 42 µv V S = 3V 22 2 µv V S = V, MS8 Package 7 2 µv V S = 3V, MS8 Package µv V OS TC Input Offset Voltage Drift (Note 4).4 2 µv/ C I B Input Bias Current (Note ) 2 2 pa V CM = V (Note 6) 24 na I OS Input Offset Current (Note ) 2 2 pa A VOL Large-Signal Voltage Gain V S = V, V O =.2V to 4.V, R L = k 7 28 V/mV V S = 3V, V O =.2V to 2.V, R L = k 4 V/mV Input Voltage Range.2 36 V CMRR Common Mode Rejection Ratio V CM =.2V to 4V, V S = V 89 6 db V CM =.2V to V, V S = V 64 8 db PSRR Power Supply Rejection Ratio V S = 2.4V to 2V, V CM = V O =.V db Minimum Operating Supply Voltage V V OL Output Voltage Swing LOW No Load mv I SINK = µa 22 4 mv V OH Output Voltage Swing HIGH No Load V.8 V.4 V I SORCE = µa V.36 V.8 V I SC Short-Circuit Current (Note ).6. ma I S Supply Current per Amplifier (Note 6).2.8 µa The denotes the specifications which apply over the temperature range of 4 C T A 8 C, V S = V, 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 = V 2 47 µv V S = 3V 2 7 µv V S = V, MS8 Package 2 7 µv V S = 3V, MS8 Package 2 67 µv V OS TC Input Offset Voltage Drift (Note 4).4 2 µv/ C I B Input Bias Current (Note ) 2 7 pa V CM = V (Note 6) 27 na I OS Input Offset Current (Note ) 2 7 pa A VOL Large-Signal Voltage Gain V S = V, V O =.2V to 4.V, R L = k 2 V/mV V S = 3V, V O =.2V to 2.V, R L = k 3 V/mV Input Voltage Range.2 36 V CMRR Common Mode Rejection Ratio V CM =.2V to 4V, V S = V 88 6 db V CM =.2V to V, V S = V 7 db PSRR Power Supply Rejection Ratio V S = 2.7V to 2V, V CM = V O =.V 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. mv I SORCE = µa V.38 V.9 mv I SC Short-Circuit Current (Note ).4.9 ma I S Supply Current per Amplifier (Note 6). 2.3 µa 4

5 ELECTRICAL CHARACTERISTICS T A = 2 C, V S = ±V, V CM = V O = V, unless otherwise noted. LT494/LT49/LT496 The denotes the specifications which apply over the temperature range of 4 C T A 2 C. V S = V, V; V S = 3V, V; V CM = V O = half supply, unless otherwise noted. (Note 3) LT494H/LT49H/LT496H SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage V S = V µv V S = 3V µv V OS TC Input Offset Voltage Drift (Note 4).4 3 µv/ C I B Input Bias Current (Note ) 3.8 na V CM = V (Note 6).3 2 µa I OS Input Offset Current (Note ).3 2 na A VOL Large-Signal Voltage Gain V S = V, V O =.2V to 4.V, R L = k 4 2 V/mV V S = 3V, V O =.2V to 2.V, R L = k 2 7 V/mV Input Voltage Range. 36 V CMRR Common Mode Rejection Ratio V CM =.V to 4V, V S = V 72 9 db V CM =.V to V, V S = V 8 db PSRR Power Supply Rejection Ratio V S = 2.7V to 2V, V CM = V O =.V 86 db Minimum Operating Supply Voltage 2.7 V V OL Output Voltage Swing LOW No Load 7 6 mv I SINK = µa 27 mv V OH Output Voltage Swing HIGH No Load V 4 V 4 mv I SORCE = µa V 4 V 22 mv I S Supply Current per Amplifier (Note 6) 2 µa SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage 2 7 µv MS8 Package 2 67 µv I B Input Bias Current 2 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 2 V CMRR Common Mode Rejection Ratio V CM = V to 4V 2 db PSRR Power Supply Rejection Ratio V S = ±V to ±V 96 2 db V OL Output Voltage Swing LOW R L = M V R L = k V V OH Output Voltage Swing HIGH R L = M V R L = k V I SC Short-Circuit Current.7. ma I S Supply Current per Amplifier.4 2. µa

6 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the temperature range of C T A 7 C, V S = ±V, V CM = V O = V, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage µv MS8 Package µv I B Input Bias Current 2 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 V CMRR Common Mode Rejection Ratio V CM = 4.8V to 4V 98 2 db PSRR Power Supply Rejection Ratio V S = ±V to ±V 94 2 db V OL Output Voltage Swing LOW R L = M V R L = k V V OH Output Voltage Swing HIGH R L = M V R L = k V 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 8 C, V S = ±V, V CM = V O = V, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage 2 67 µv MS8 Package 2 77 µv I B Input Bias Current 2 7 pa I OS Input Offset Current 2 7 pa A VOL Large-Signal Voltage Gain V O = ±V, R L = k 2 V/mV Input Voltage Range V CMRR Common Mode Rejection Ratio V CM = 4.8V to 4V 96 4 db PSRR Power Supply Rejection Ratio V S = ±V to ±V 92 2 db V OL Output Voltage Swing LOW R L = M V R L = k V V OH Output Voltage Swing HIGH R L = M V R L = k V I SC Short-Circuit Current.4. ma I S Supply Current per Amplifier µa 6

7 ELECTRICAL CHARACTERISTICS LT494/LT49/LT496 The denotes the specifications which apply over the temperature range of 4 C T A 2 C. V S = ±V, V CM = V O = half supply, unless otherwise noted. (Note 3) LT494H/LT49H/LT496H SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage 27 µv I B Input Bias Current 3.8 na I OS Input Offset Current.3 2 na A VOL Large-Signal Voltage Gain V O = ±V, R L = k 2 7 V/mV Input Voltage Range 4. 2 V CMRR Common Mode Rejection Ratio V CM = 4.V to 4V 69 9 db PSRR Power Supply Rejection Ratio V S = ±V to ±V 89 db V OL Output Voltage Swing LOW R L = M V R L = k V V OH Output Voltage Swing HIGH R L = M V R L = k V I S Supply Current per Amplifier 3 6 µa Note : Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The LT494C/LT49C/LT496C and LT494I/LT49I/LT496I are guaranteed functional over the operating temperature range of 4 C to 8 C. The LT494H/LT49H/LT496H are guaranteed functional over the operating temperature range of 4 C to 2 C. Note 3: The LT494C/LT49C/LT496C are guaranteed to meet specified performance from C to 7 C. The LT494C/LT49C/LT496C 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. The LT494I/LT49I/LT496I are guaranteed to meet specified performance from 4 C to 8 C. The LT494H/LT49H/LT496H are guaranteed to meet specified performance from 4 C to 2 C. Note 4: This parameter is not % tested. Note : V S = V limits are guaranteed by correlation to V S = 3V and V S = ±V tests. Note 6: V S = 3V limits are guaranteed by correlation to V S = V and V S = ±V tests. TYPICAL PERFORMANCE CHARACTERISTICS W PERCENT OF NITS (%) Distribution of Input Offset Voltage V S = V, V LT494/LT49/ LT496 7 OP AMPS SPPLY CRRENT PER AMPLIFIER (µa) Supply Current vs Temperature V S = ±V CHANGE IN OFFSET VOLTAGE (µv) Minimum Supply Voltage 2 T A = 2 C T A = 4 C T A = 8 C INPT OFFSET VOLTAGE (µv) TEMPERATRE ( C) TOTAL SPPLY VOLTAGE (V) 49 G 49 G2 49 G3 7

8 TYPICAL PERFORMANCE CHARACTERISTICS W Output Saturation Voltage vs Load Current (Output Low) V S = V, V Output Saturation Voltage vs Load Current (Output High) V S = V, V 3 Input Bias Current vs Common Mode Voltage V S = V, V T A = 8 C SATRATION VOLTAGE (mv) T A = 8 C T A = 4 C T A = 2 C SATRATION VOLTAGE (mv) T A = 8 C T A = 4 C T A = 2 C INPT BIAS CRRENT (na) 2.. T A = 4 C T A = 2 C T A = 4 C T A = 2 C T A = 8 C. LOAD CRRENT (µa). LOAD CRRENT (µa) COMMON MODE VOLTAGE (V) 49 G4 49 G 49 G6 VOLTAGE GAIN (db) Gain and Phase Shift vs Frequency GAIN PHASE PHASE SHIFT (DEG) NOISE VOLTAGE (nv/ Hz) 2 Noise Voltage Spectrum CRRENT NOISE (fa/ Hz) Noise Current Spectrum FREQENCY (khz) FREQENCY (Hz) FREQENCY (Hz) 49 G 49 G8 49 G9 FREQENCY (khz) Gain Bandwidth and Phase Margin vs Supply Voltage PHASE MARGIN GBW PHASE MARGIN (DEG) OTPT VOLTAGE (2µV/DIV).Hz to Hz Output Voltage Noise V S = ±V V CM = V OVERSHOOT (%) Capacitive Load Handling A V = 4 3 A V = 2 A V = SPPLY VOLTAGE (V) TIME (s/div) CAPACITIVE LOAD (pf) 49 G 49 G7 49 G2 8

9 TYPICAL PERFORMANCE CHARACTERISTICS W COMMON MODE REJECTION RATIO (db) Common Mode Rejection Ratio vs Frequency.. FREQENCY (khz) 49 G3 POWER SPPLY REJECTION RATIO (db) Power Supply Rejection Ratio vs Frequency. NEGATIVE SPPLY POSITIVE SPPLY. FREQENCY (khz) 49 G4 OTPT IMPEDANCE (kω) Output Impedance vs Frequency A V = A V =... FREQENCY (khz) 49 G OFFSET VOLTAGE CHANGE (µv) Warm-p Drift vs Time V S = ±V 2 3 OFFSET VOLTAGE CHANGE (µv) 2 Open-Loop Gain V S = V, V R L = k R L = M V S = V, V OFFSET VOLTAGE CHANGE (µv) Open-Loop Gain V S = ±V R L = M R L = k V S = ±V TIME AFTER POWER-P (SEC) OTPT VOLTAGE (V) OTPT VOLTAGE (V) 2 49 G6 49 G7 49 G8 Small-Signal Response V S = ±V Small-Signal Response V S = V, V Large-Signal Response V S = V, V V S = ±V R L = M C L = pf 49 G9 V S = V, V R L = M C L = pf 49 G2 V S = V, V R L = M C L = pf 49 G2 9

10 APPLICATIONS INFORMATION Start-p Characteristics W 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 LT49 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. V S SPPLY CRRENT PER AMPLIFIER (µa) OTPT HIGH Figure. Start-p Characteristics V S OTPT LOW OTPT HIGH OTPT LOW OTPT V S / SPPLY VOLTAGE (V) V S /2 49 F V S OTPT AT V S /2 Figure 2. Circuits for Start-p Characteristics 49 F2 Reverse Battery The LT494/LT49/LT496 are protected against reverse battery voltages up to 8V. 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 LT494/LT49/LT496 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. 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 = and light loads, where the load capacitance should be less than pf with a V 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 LT494/LT49/LT496. 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.

11 APPLICATIONS INFORMATION W V IN Q D D2 D3 Q3 Q4 C Q D7 I Q2 Q2 OT IN Q Q2 Q3 Q4 Q7 (V ).8V Q6 Q7 Q9 Q.. Q6.. Q Q2 D4 D Q9 Q8 R R2 I 2 D6 Q8 Q22 49 F3 Figure 3. Simplified Schematic 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.8V), Q and Q2 are active. When the input common mode exceeds (V CC.8V), Q7 turns on, diverting the current from diff amp Q-Q2 to current mirror Q8-Q9. The current from Q8 biases on the other diff amp consisting of PNP s Q-Q6 and NPN s Q3-Q4. Though Q-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.8V) and V CC, devices Q3 and Q4 act as followers, forming a buffer between the amplifier inputs and the emitters of the Q-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 Q-Q6 operates normally, however, the input bias current increases to the emitter current of Q-Q6, which is typically 8nA. 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 Q set the output quiescent current.

12 TYPICAL APPLICATIONS N 3µA, khz to khz Voltage to Frequency Converter 27k M* 3.9M* V V IN V TO 2.V 62k* N72 k.82µf LTC 44 2pF µf 39Ω /2 LT49 3.9M 2M V.2 REFERENCE LTC44 N448 Q: ZTX-849 *% METAL FILM POLYSTYRENE k Q 36k 39k pf OTPT khz TO khz 3.6M TYP SELECT FOR Hz AT V IN =.2V /2 LT49 M.µF V 2.V = khz khz SPPLY CRRENT = 6.2µA QIESCENT = 3.3µA AT f = khz LINEARITY: ±.3% PSRR (4.4V TO 36V): ppm/v TEMPERATRE DRIFT: 2ppm/ C 49 TA7 6µA, A V =, Chopper Stabilized Amplifier INPT φ φ2 µf M µf φ2 M /2 LT49 /2 M LT49 V φ V.2µF OTPT k M M φ k.47µf /2 LTC44 M M V /2 LTC44 V φ2 GAIN: OFFSET: µv DRIFT: nv/ C SPPLY CRRENT:.µA BANDWIDTH:.2Hz CLOCK RATE: 4Hz CD46 QAD 49 TA8 2

13 TYPICAL APPLICATIONS N 6th Order Hz Elliptic Lowpass Filter k k Filter Frequency Response nf nf nf e in 2k 2k 3nF V S = V, V I S = 2µA e in /k ZEROS AT Hz AND 6Hz nf nf 2k 8.6k nf k /2 LT49 2k nf k nf GAIN (db) FREQENCY (Hz) LT49/96 TA4 69k 69k 3nF 69k nf /2 LT49 OTPT 2k k nf 49 TA3 PACKAGE DESCRIPTION MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # -8-66).8 ±.4* (3. ±.2) ±.6 (4.9 ±.).8 ±.4** (3. ±.2) (.8).2 ±.6 (.3 ±.) 6 TYP SEATING PLANE.43 (.) MAX.9. (.22.38).26 (.6) BSC * DIMENSION DOES NOT INCLDE MOLD FLASH, PROTRSIONS OR GATE BRRS. MOLD FLASH, PROTRSIONS OR GATE BRRS SHALL NOT EXCEED.6" (.2mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH OR PROTRSIONS. INTERLEAD FLASH OR PROTRSIONS SHALL NOT EXCEED.6" (.2mm) PER SIDE.34 (.86) REF. ±.2 (.3 ±.) MSOP (MS8) 3

14 PACKAGE DESCRIPTION N8 Package 8-Lead PDIP (Narrow.3 Inch) (Reference LTC DWG # -8-).4* (.6) MAX ±.* (6.477 ±.38) ( ).4.6 (.43.6).3 ±. (3.32 ±.27).9. ( ) ( ).6 (.6) TYP. (2.4) BSC *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.24mm).2 (3.7) MIN.8 ±.3 (.47 ±.76).2 (.8) MIN N8 98 S8 Package 8-Lead Plastic Small Outline (Narrow. Inch) (Reference LTC DWG # -8-6).89.97* (4.8.4) ( )..7** ( ) SO (.23.24)..2 (.24.8) 4 8 TYP.3.69 ( ).4. (..24).6. (.46.27) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.2mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.24mm) PER SIDE.4.9 (.3.483) TYP. (.27) BSC 4

15 PACKAGE DESCRIPTION N Package 4-Lead PDIP (Narrow.3 Inch) (Reference LTC DWG # -8-).77* (9.8) MAX ±.* (6.477 ±.38) ( ).3 ±. (3.32 ±.27).4.6 (.43.6).9. ( ) ( ).2 (.8) MIN.2 (3.7) MIN. (.2) MIN *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.24mm). (2.4) BSC.6 (.6) TYP.8 ±.3 (.47 ±.76) N4 98 S Package 4-Lead Plastic Small Outline (Narrow. Inch) (Reference LTC DWG # -8-6) * ( ) ( )..7** ( ) (.23.24)..2 (.24.8) 4 8 TYP.3.69 ( ).4. (..24).6. (.46.27) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.2mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.24mm) PER SIDE.4.9 (.3.483) TYP. (.27) BSC S4 298 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.

16 TYPICAL APPLICATIONS N I L CHARGE Battery Current Monitor R SENSE.Ω na to 2nA Current Meter pf DISCHARGE A2 /2 LT49 R A R A 2N394 R B DISCHARGE OT R A R A CHARGE OT 2N394 A /2 LT49 V ( ) 2V R V O = I B L R SENSE R A R B FOR R A = k, R B = k V O = V/A I L 49 TA INPT CRRENT R4 k /2 LT49 R M R2 9k R3 2k FLL-SCALE ADJST µa TO µa 2µA.V.V 49 TA6 /2 LT49 I S = 3µA WHEN I IN = NO ON/OFF SWITCH REQIRED High Side Current Sense V S = 2.7V TO 36V LOAD R A k R SENSE Ω I L LT494 R B k V O _ R ( B ) V O = I L R S R A FOR R A = k, R B = k, R S = Ω V O = V/A I L OTPT OFFSET I S R B mv OTPT CLIPS AT V S 2.4V 49 TA9 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LTC 44/4/42 Micropower Single/Dual Comparators with % Reference LTC44: Single, LTC44/42: Dual LTC443/44/4 Micropower Quad Comparators with % Reference LTC443:.82 Reference LTC444/4:.22V Reference and Adjustable Hysteresis LT466/LT467 7µA Dual/Quad Rail-to-Rail Input and Output Op Amps 39µV V OS(MAX), Gain Bandwidth = 2kHz LT49A/LT49A µa Dual/Quad Rail-to-Rail Input and Output Op Amps 9µV V OS(MAX), Gain Bandwidth = 2kHz LTC4 Nanopower Single Comparator with % Reference 3nA Supply Current LT636 Single Over-The-Top Micropower, 22µV V OS(MAX), I S = µa (MAX), Gain-Bandwidth = 2kHz Rail-to-Rail Input and Output Op Amp Shutdown Pin, MSOP LT672/LT673/LT674 2µA MAX, A V Single/Dual/Quad Over-The-Top Precision Decompensated Version of the LT494/LT49/LT496 Rail-to-Rail Input and Output Op Amps A V, Gain-Bandwidth = 2kHz LT278/LT279 µa Dual/Quad Single Supply Op Amps 2µV V OS(MAX), Gain Bandwidth = 2kHz LT278/LT279 7µA Dual/Quad Single Supply Op Amps 2µV V OS(MAX), Gain Bandwidth = 6kHz LT782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail SOT-23, 8µV V OS(MAX), I S = µa (Max), Input and Output Op Amp Gain-Bandwidth = 2kHz, Shutdown Pin LT783.2MHz, Over-The-Top, Micropower, Rail-to-Rail SOT-23, 8µV V OS(MAX), I S = 3µA (Max), Input and Output Op Amp in SOT-23 Gain-Bandwidth =.2MHz, Shutdown Pin 6 Linear Technology Corporation 63 McCarthy Blvd., Milpitas, CA (48) FAX: (48) TELEX: fb LT/TP 8.K REV B PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 997

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