FEATURES TYPICAL APPLICATIO. LT1635 Micropower Rail-to-Rail Op Amp and Reference DESCRIPTIO APPLICATIO S

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1 LT5 Micropower Rail-to-Rail Op Amp and Reference FEATRES Guaranteed Operation at.v Op Amp and Reference on Single Chip Micropower: µa Supply Current Industrial Temperature Range SO- Packages Rail-to-Rail Output High Output Current: ma Min Output Drives pf Capable of Floating Mode Operation Specified for 5V and ±5V Supplies Low Reference Drift: ppm/ C Industry Standard LM Pinout APPLICATIO S Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Precision Current Regulators Precision Voltage Regulators Battery Level Indicator Thermocouple Transmitter DESCRIPTIO The LT 5 is a new analog building block that includes a rail-to-rail output op amp, a precision reference and reference buffer. The device operates from supplies as low as a single.v or up to ±5V, yet it consumes only µa of supply current. The input common mode range of the op amp includes ground and incorporates phase reversal protection to prevent false outputs from occurring when the input is below the negative supply. The rail-to-rail output stage can swing to within 5mV of each rail with no load and can swing to within 5mV of each rail while delivering ma of output current. The gain bandwidth of the op amp is 5kHz and it is unitygain stable with up to pf load capacitance. The.V reference is referred to V and includes a buffer amplifier to enhance flexibility. The reference and buffer combine to achieve a drift of ppm/ C, a line regulation of ppm/v and a load regulation of 5ppm/mA. The LT5 is available in -pin PDIP and SO packages, and has the industry standard LM pinout., LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO V to 5V Regulator Typical Distribution of Input Offset Voltage C.µF R k R.9k V IN > 5.V LT5 V OT V TO 5V PERCENT OF NITS V S = 5V, V V OT ADJ R 5k 5 TA INPT OFFSET VOLTAGE (mv) 5 TA

2 LT5 ABSOLTE AXI RATI GS W W W (Note ) Total Supply Voltage (V to V )... V Input Differential Voltage... V Input Current... ±5mA Output Short-Circuit Duration...Continuous Operating Temperature Range (Note )... C to 5 C Junction Temperature... 5 C Storage Temperature Range... 5 C to 5 C Lead Temperature (Soldering, sec)... C W PACKAGE/ORDER I FOR ATIO REFOT OP AMP IN () OP AMP IN () V N PACKAGE -LEAD PDIP TOP VIEW S PACKAGE -LEAD PLASTIC SO T JMAX = 5 C, θ JA = C/ W (N) T JMAX = 5 C, θ JA = 9 C/ W (S) REF FB V OP AMP OT 5 BALANCE ORDER PART NMBER LT5CN LT5CS LT5IN LT5IS S PART MARKING 5 5I Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS 5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at. V S = 5V, V; V CM = V OT =.5V, unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage.. mv C T A C.5. mv C T A 5 C. mv Input Offset Voltage Drift C T A 5 C (Note ).. µv/ C V OS ADJ Offset Voltage Adjust Range Positive Adjust mv Negative Adjust. mv I OS Input Offset Current.. na I B Input Bias Current..5 na na Input Noise Voltage.Hz to Hz µv P-P e n Input Noise Voltage Density f = khz 5 nv/ Hz i n Input Noise Current Density f = khz.5 pa/ Hz R IN Input Resistance Differential 5 MΩ Common Mode, V CM = V to V GΩ Input Voltage Range V CMRR Common Mode Rejection Ratio V CM = V to V 9 db 5 9 db A VOL Large-Signal Voltage Gain V O = mv to.5v, No Load 5 V/mV V O = mv to.5v, R L =.k 5 V/mV V O = mv to.5v, R L = 5Ω 5 5 V/mV Shunt Gain I OT =.ma to 5mA V/mV V O =.5V to.5v 5 5 V/mV (Note 5) V/mV V OL Output Voltage Swing Low V S = 5V, No Load mv V S = 5V, I SINK = 5mA 5 5 mv V S = 5V, I SINK = ma 5 mv V OH Output Voltage Swing High V S = 5V, No Load V V S = 5V, I SORCE = 5mA.5. V V S = 5V, I SORCE = ma.55.5 V

3 LT5 ELECTRICAL CHARACTERISTICS 5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at. V S = 5V, V; V CM = V OT =.5V, unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS I SC Short-Circuit Current V S = 5V, Short to GND ma V S = 5V, Short to V CC ma PSRR Power Supply Rejection Ratio V S =.V to V, V CM = V O =.V 9 db 9 9 db Minimum Operating Supply Voltage (Note ).. V I S Supply Current µa 5 µa GBW Gain Bandwidth Product f = khz 5 khz SR Slew Rate A V =, R L =.5 V/µs 5V REFERENCE: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at. V S = 5V, V, unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V REF Feedback Sense Voltage Voltage at Pin with Pin Connected 9 mv to Pin (Note ) TC V REF Reference Drift (Note ) ppm/ C Feedback Current Current into Pin.5 na 5. 5 na Line Regulation I REF ma, V REF = mv V S =.V to 5V ppm/v V S =.V to 5V (Note ) ppm/v Load Regulation I REF = to ma 5 ppm/ma 5 ppm/ma Reference Amplifier Gain V O =.V to.5v 5 9 V/mV 5 5 V/mV ±5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at. ; V CM = V OT = V, unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V OS Input Offset Voltage..5 mv C T A C.5.9 mv C T A 5 C. mv Input Offset Voltage Drift C T A 5 C (Note ).5. µv/ C V OS ADJ Offset Voltage Adjust Range Positive Adjust mv Negative Adjust. mv I OS Input Offset Current.. na I B Input Bias Current..5 na na Input Noise Voltage.Hz to Hz µv P-P e n Input Noise Voltage Density f = khz 5 nv/ Hz i n Input Noise Current Density f = khz.5 pa/ Hz R IN Input Resistance Differential 5 MΩ Common Mode, V CM = 5V to V 9 GΩ Input Voltage Range 5 V CMRR Common Mode Rejection Ratio V CM = 5V to V 9 5 db 9 db

4 LT5 ELECTRICAL CHARACTERISTICS ±5V OP AMP: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at. ; V CM = V OT = V, unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS A VOL Large-Signal Voltage Gain V O =.5V to.5v, No Load 5 V/mV V O =.5V to.5v, R L =.k 5 V/mV V O =.5V to.5v, R L = 5Ω V/mV V O Output Voltage Swing, No Load ±.95 ±.95 mv, I SINK = 5mA ±.5 ±.5 mv, I SINK = ma ±.5 ±. mv I SC Short-Circuit Current ± ± ma PSRR Power Supply Rejection Ratio V S = ±V to ±V, V CM = V O = V 9 db 9 db I S Supply Current 5 5 µa µa GBW Gain Bandwidth Product f = khz 5 khz SR Slew Rate A V =, R L =.5 V/µs ±5V REFERENCE: The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at., unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS V REF Feedback Sense Voltage Voltage at Pin with Pin Connected 9 mv to Pin (Note ) TC V REF Reference Drift (Note ) ppm/ C Feedback Current Current into Pin.5 na 5. 5 na Line Regulation I REF ma, V REF = mv V S = ±.V to ±5V ppm/v V S = ±.5V to ±5V (Note ) ppm/v Load Regulation I REF = to ma 5 ppm/ma 5 ppm/ma Reference Amplifier Gain V O =.V to.5v 5 9 V/mV V S = V, V 5 5 V/mV Note : Absolute Maximum Ratings are those values beyond which the life of a device may be imparied. Note : The LT5C is guaranteed to operate over the commercial temperature range of C to C. It is designed, characterized and expected to meet these extended temperature limits, but is not tested at C and 5 C. The LT5I is guaranteed to meet the industrial temperature range. Note : The LT5 op amp operates on a.v supply over the full industrial temperature range with an input common mode voltage of V to.v. The minimum supply voltage for the reference to operate properly over this temperature range is.v. Note : This parameter is not % tested. Temperature coefficient is measured by dividing the change in output voltage by specified temperature range. Note 5: Shunt gain defines the operation in floating applications when the output is connected to the V terminal and input common mode is referred to V. Note : If part is stored outside of the specified temperature range, the output may shift due to hysteresis.

5 LT5 TYPICAL PERFOR A CE CHARACTERISTICS W Op Amp SPPLY CRRENT (µa) Supply Current vs Supply Voltage T A = 55 C T A = 5 C 5 9 SPPLY VOLTAGE (V) OFFSET CRRENT (pa) BIAS CRRENT (na) 5 5 Input Bias and Offset Currents vs Temperature I OS I B V S = 5V, V TEMPERATRE ( C) INPT BIAS CRRENT (na) 5 Input Bias Current vs Common Mode Voltage V S = 5V, V T A = 5 C T A = 55 C COMMON MODE VOLTAGE (V) 5 G 5 G 5 G NOISE VOLTAGE (µv/div).hz to Hz Noise Voltage 5 9 TIME (SEC) INPT NOISE VOLTAGE DENSITY (nv/ Hz) 5 Noise Voltage Density vs Frequency V S = ±.5V FREQENCY (Hz) INPT NOISE CRRENT DENSITY (pa/ Hz) Input Noise Current vs Frequency V S = ±.5V FREQENCY (Hz) 5 G 5 G5 5 G PERCENT OF NITS Typical Distribution of Offset Voltage Drift with Temperature V S = 5V, V TCV OS (µv/ C) CHANGE IN INPT OFFSET VOLTAGE (V) Minimum Supply Voltage T A = 5 C T A = 55 C TOTAL SPPLY VOLTAGE (V) CHANGE IN OFFSET VOLTAGE (µv) Turn-On Drift of Three Typical nits 5 9 TIME AFTER POWER ON (MINTES) 5 G 5 G 5 G9 5

LT5 TYPICAL PERFOR A CE CHARACTERISTICS W Op Amp VOLTAGE GAIN (db) Voltage Gain vs Frequency V S = ±.5V VOLTAGE GAIN (db) 5 Gain Phase vs Frequency PHASE MARGIN GAIN V S = ±.

6 LT5 TYPICAL PERFOR A CE CHARACTERISTICS W Op Amp VOLTAGE GAIN (db) Voltage Gain vs Frequency V S = ±.5V VOLTAGE GAIN (db) 5 Gain Phase vs Frequency PHASE MARGIN GAIN V S = ±.5V PHASE PHASE SHIFT (DEG) OVERSHOOT (%) 5 Capacitive Load Handling R L = A V = 5 A V = A V =.. k k k M FREQENCY (Hz) FREQENCY (khz) CAPACITIVE LOAD (pf) 5 G 5 G 5 G. Slew Rate vs Temperature 5 Gain-Bandwidth Product and Phase Margin vs Temperature V S = ±.5V 5 M Voltage Gain vs Load Resistance V S = 5V, V SLEW RATE (V/µs) RISING SLEW RATE FALLING SLEW RATE GAIN-BANDWIDTH PRODCT (khz) 5 5 GAIN-BANDWIDTH PRODCT PHASE MARGIN 5 55 PHASE MARGIN (DEG) VOLTAGE GAIN (V/V) T A = 55 C T A = 5 C TEMPERATRE ( C) TEMPERATRE ( C) k. LOAD RESISTANCE TO GROND (kω) 5 G 5 G 5 G5.5 Shunt Gain Large-Signal Transient Response Large-Signal Transient Response V S = 5V, V INPT VOLTAGE CHANGE (mv).... I OT = ma V IN V OT I OT I OT = ma 5 OTPT VOLTAGE (V) V/DIV A V =, NO LOAD INPT V P-P µs/div 5 G V V/DIV µs/div A V =, NO LOAD INPT PLSE V TO V 5 G V 5 G

7 LT5 TYPICAL PERFOR A CE CHARACTERISTICS W Op Amp OTPT SATRATION VOLTAGE (mv) Output Saturation Voltage vs Input Overdrive V S = ±.5V, NO LOAD OTPT HIGH OTPT LOW OTPT SATRATION VOLTAGE (mv) Output Saturation Voltage vs Load Current (Output Low) V S = ±.5V V OD = mv T A = 5 C T A = 55 C OTPT SATRATION VOLTAGE (V). Output Saturation Voltage vs Load Current (Output High) V S = ±.5V V OD = mv T A = 5 C T A = 55 C INPT OVERDRIVE (mv)... SINKING LOAD CRRENT (ma).... SORCING LOAD CRRENT (ma) 5 G9 5 G 5 G V V V V.5 COMMON MODE RANGE (V) V.5 Common Mode Range vs Temperature COMMON MODE REJECTION RATIO (db) Common Mode Rejection Ratio vs Frequency V S = ±.5V POWER SPPLY REJECTION RATIO (db) Power Supply Rejection Ratio vs Frequency NEGATIVE SPPLY V S = ±.5V POSITIVE SPPLY V TEMPERATRE ( C) k k FREQENCY (Hz) k. k FREQENCY (Hz) k k 5 G 5 G 5 G OTPT IMPEDANCE (Ω) Output Impedance vs Frequency V S = ±.5V A V = A V = A V = mv/div Small-Signal Transient Response V mv/div Small-Signal Transient Response V S = 5V, V. FREQENCY (khz) A V = C L = 5pF 5µs/DIV 5 G 5µs/DIV A V = C L = 5pF INPT 5mV TO mv 5 G 5 G5

8 LT5 TYPICAL PERFOR A CE CHARACTERISTICS W Reference Typical Distribution of Initial Accuracy Line Regulation Load Regulation PERCENT OF NITS V S = 5V, V REFERENCE OTPT (mv) 5 V S = 5V, V T A = 55 C T A = 5 C REFERENCE CHANGE (ppm) V S = 5V, V REFERENCE VOLTAGE (mv) SPPLY VOLTAGE (V) SORCING CRRENT (ma) 5 G 5 G9 5 G Reference Output vs Temperature of Two Typical nits Output Saturation vs Load Current (Sourcing) Reference Amplifier Gain REFERENCE OTPT (mv) 5 OTPT SATRATION VOLTAGE (V) V S = 5V, V T A = 55 C T A = 5 C GAIN (db) V S = 5V, V TEMPERATRE ( C).5 SORCING CRRENT (ma) k k FREQENCY (Hz) k M M 5 G 5 G 5 G BLOCK DIAGRA W OTPT REFERENCE FEEDBACK V BALANCE 5 INPTS OP AMP REF AMP REFERENCE OTPT mv REFERENCE V 5 BD

9 LT5 APPLICATIO S I FOR ATIO The LT5 is fully specified with V = 5V, V = V and V CM =.5V. The op amp offset voltage is internally trimmed to a minimum value at these supply voltages. A unique feature of this device is that it operates from a single.v supply up to ±5V. A full set of specifications is provided at ±5V supply voltages. The positive supply pin of the LT5 should be bypassed with a small capacitor (about.µf), as well as the negative supply pin when using split supplies. Op Amp The LT5 is fully specified for single supply operation, i.e., when the negative supply is V. Input common mode range of the op amp includes ground and the output swings within a few millivolts of ground while sinking current. The input stage of the op amp incorporates phase reversal protection to prevent false outputs from occurring when the input is below the negative supply. Protective resistors have been included in the input leads so that current does not become excessive when the inputs are forced below the negative supply. The op amp also includes an offset nulling feature, this is accomplished by connecting the BALANCE pin (Pin 5) to a variable voltage derived from the reference output. The offset adjust range is asymmetrical, typically mv to mv. At room temperature the input offset voltage of the LT5 is within the null range, thus the offset voltage can be adjusted to zero. Figure shows the standard offset adjustment. W LT5 5 V R k Output The output voltage swing of the LT5 is a function of input overdrive as shown in the typical performance curves. When monitoring voltages within 5mV of either rail, gain V VREF 5 F Figure. Standard Offset Adjustment should be taken to keep the output from saturating. For example, a mv input signal will cause the amplifier to set up in its linear region in the gain configuration as shown in Figure a. However, mv is not enough to make the amplifier function properly in the voltage follower mode (Figure b). mv LT5 OP AMP 99R 5V R (a) mv Figure. Gain Amplifier and Voltage Follower Distortion There are two main contributors of distortion in op amps: distortion caused by nonlinear common mode rejection and output crossover distortion as the output transitions from sourcing to sinking current. The common mode rejection ratio of the LT5 is very good, typically db. Therefore, as long as the input operates in normal common mode range, there will be very little common mode induced distortion. Crossover distortion will increase as the output load resistance decreases. For the lowest distortion, the LT5 should be operated with the output always sourcing current. Reference The reference of the LT5 consists of a mv precision bandgap and a reference amplifier. As shown in the block diagram, the.v precision bandgap is referred to V and is internally connected to the noninverting input of the reference amplifier. This configuration offers great flexibility in that the reference voltage can be amplified or the reference amplifier can be used as a comparator. nlike the op amp, the output of the reference amplifier can only swing within.v (typ) of the positive rail. To guarantee that the reference amplifier does not saturate over the industrial temperature range, the minimum operating supply should be.v. The reference amplifier can source ma of load current and can sink µa over the industrial temperature range. mv 5V LT5 OP AMP (b) OTPT SATRATED mv 5 F 9

10 LT5 TYPICAL APPLICATIO S Low Voltage Regulator C.µF Best Regulation V IN > V R k R k V IN >.V LT5 V OT V OPTIONAL* R k LT5 R k V OT 5V *SE ELECTROLYTIC OTPT CAPACITORS 5 TA 5 TA -Terminal Current Regulator Shunt Regulator (R R)V I REF OT = (R)(R) C*.µF R R LT5 R 5 TA5 R R LT5 ( ) V R OT = V REF R *REQIRED FOR CAPACITIVE LOADING 5 TA Negative Regulator V Battery-Level Indicator R 9.9k % Q N9 C µf ELECT LT5 V OT 5V R k % GROND V IN 5.5V 5 TA R k R k R k D LT5 LED DIMS BELOW V R.5k 5 TA

11 LT5 SI PLIFIED SCHE ATICS W W Op Amp V Q Q R k Q C Q5 Q OTPT INPTS R k Q Q Q Q Q Q Q9 Q Q k 5 BALANCE Q Q5 Q Q Q Q Q5 V 5 SSOA C Reference V REF FB REFOT V 5 SSREF PACKAGE DESCRIPTIO..5 (..55) N Package -Lead PDIP (Narrow. Inch) (Reference LTC DWG # 5--5).5.5 (..5). ±.5 (. ±.).* (.) MAX (.9.) ( ).5 (.5) TYP. (.5) BSC *THESE DIMENSIONS DO NOT INCLDE MOLD FLASH OR PROTRSIONS. MOLD FLASH OR PROTRSIONS SHALL NOT EXCEED. INCH (.5mm).55 ±.5* (. ±.).5 (.5) MIN. (.5). ±. (.5 ±.) MIN 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. N 9

12 LT5 TYPICAL APPLICATIO A Shunt Battery Charger (I DARK = µa, V FLOAT = V) A LT5 SOLAR V OP AMP ARRAY mv LT5 REF k M k M Ω nf TIP.5Ω* W A V 5A GELCEL *DALE HLM- 5 TA9 PACKAGE DESCRIPTIO S Package -Lead Plastic Small Outline (Narrow.5 Inch) (Reference LTC DWG # 5--).9.9* (. 5.).. (..5).. (.5.5) 5 TYP.5.9 (..5).. (..5) 5..5 (..) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED." (.5mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED." (.5mm) PER SIDE..9 (.55.) TYP.5 (.) BSC.. (5.9.9).5.5** (..9) SO 9 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT/LT9 Dual/Quad µa Max, Single Supply Precision Op Amps µv V OS Max and.5µv/ C Drift Max, 5kHz GBW,.V/µs Slew Rate, Input/Output Common Mode Includes Ground LT9A/LT9A Dual/Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range:.V to V, Micropower 5µA Amplifier, Rail-to-Rail Input and Output, khz GBW LT/LT9 Dual/Quad µa Max, Single Supply Precision Op Amps SO- and -Lead Standard Pinout, µv V OS Max, 5kHz GBW LT/LT9 Dual/Quad Micropower, Single Supply Precision Op Amps µv V OS Max and.µv/ C Drift, khz GBW,.V/µs Slew Rate, Input/Output Common Mode Includes Ground LT/LT9 Dual/Quad Micropower, Single Supply Precision Op Amps SO- and -Lead Standard Pinout, µv V OS Max, khz GBW Linear Technology Corporation McCarthy Blvd., Milpitas, CA 955- () -9 FAX: () -5 TELEX: fa LT/TP 9.5K REV A PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 99

DESCRIPTION FEATURES. LT1490/LT1491 Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps APPLICATIONS TYPICAL APPLICATION

DESCRIPTION FEATURES. LT1490/LT1491 Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps APPLICATIONS TYPICAL APPLICATION FEATRES Rail-to-Rail Input and Output Single Supply Input Range:.4V to 44V Micropower: µa/amplifier Max Specified on 3V, 5V and ±5V Supplies High Output Current: ma Output Drives,pF with Output Compensation