Not Recommended for New Designs

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1 Not Recommended for New Designs This product was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. The data sheet remains available for existing users. A Maxim replacement or an industry second-source may be available. Please see the QuickView data sheet for this part or contact technical support for assistance. For further information, contact Maxim s Applications Tech Support.

2 19-127; Rev. 1; 11/98 General Description The MAX478 and MAX479 are dual and quad micropower, precision op amps available in 8-pin and 14-pin DIP and small-outline packages, respectively. Both devices feature an extremely low, 17 µa max supply current per op amp, 7µV max offset voltage, 2.2µV/ C max offset voltage drift (.5µV/ C typ), and 25pA max input offset current. The MAX478 and MAX479 operate from a single supply. The input voltage range includes ground, and the output swings to within a few millivolts of ground, which eliminates pull-down resistors and saves power. Both devices are optimized for single 3V and 5V supply operation, with guaranteed specifications at each supply voltage. Specifications for ±15V operation are also provided. Applications Battery- or Solar-Powered Systems: Portable Instrumentation Remote Sensor Amplifier Satellite Circuitry Micropower Sample-and-Hold Thermocouple Amplifier Micropower Filters Single Lithium Cell Powered Systems Features 17µA Max Supply Current (MAX478A/MAX479A) 7µV Max Offset Voltage (MAX478A) Single-Supply Operation: Input Voltage Range Includes Ground Output Swings to Ground While Sinking Current No Pull-Down Resistors Required Dual Op Amp in 8-Pin DIP/SO Package (MAX478) Quad Op Amp in 14-Pin DIP/SO Package (MAX479) 25pA Max Input Offset Current (MAX478A/MAX479A).5µV/ C Offset-Voltage Drift Output Sources and Sinks 5mA Load Current Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX478ACPA C to +7 C 8 Plastic DIP MAX478CPA C to +7 C 8 Plastic DIP MAX478CSA C to +7 C 8 SO MAX478C/D C to +7 C Dice* MAX478EPA -4 C to +85 C 8 Plastic DIP MAX478ESA -4 C to +85 C 8 SO MAX479ACPD C to +7 C 14 Plastic DIP MAX479CPD C to +7 C 14 Plastic DIP MAX479CSD C to +7 C 14 SO MAX479EPD -4 C to +85 C 14 Plastic DIP MAX479ESD -4 C to +85 C 14 SO * Dice are specified at, DC parameters only. Pin Configurations Typical Operating Circuit TOP VIEW OUTA 1 8 V+ R3 R1 R2 R2 R1 OUTB INB- INB+ INA- INA+ V A MAX478 B V DIP/SO V2 V1 1/2MAX478 1/2MAX478 MICROPOWER, HIGH INPUT IMPEDANCE DIFFERENTIAL AMPLIFIER WITH VARIABLE GAIN IN 8-PIN DIP/SO V OUT V OUT = (V1-V2) (1 + R1 + 2 R1 ) R2 R3 OUTD IND- IND+ V- INC+ INC- OUTC OUTA INA- INA+ V+ INB+ INB- OUTB A D MAX479 B C DIP/SO Maxim Integrated Products 1 For free samples & the latest literature: or phone For small orders, phone

3 ABSOLUTE MAXIMUM RATINGS Supply Voltage...±22V Differential Input Voltage...±3V Input Voltage...Equal to Positive Supply Voltage...5V Below Negative Supply Voltage Output Short-Circuit Duration...Continuous Continuous Power Dissipation (T A = +7 C): 8-Pin Plastic DIP (derate 9.9mW/ C above +7 C) mW 14-Pin Plastic DIP (derate 1.mW/ C above +7 C).. 8mW 14-Pin Wide SO (derate 9.52mW/ C above +7 C) mW ELECTRICAL CHARACTERISTICS: 5V (, V CM =.1V, V O = 1.4V,, unless otherwise noted.) Operating Temperature Ranges: MAX47_ACP_/C... C to +7 C MAX47_E...-4 C to +85 C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1sec)...+3 C Stresses beyond those listed under Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Input Offset Voltage V OS MAX478AC MAX479AC MAX478C/E MAX479C/E MAX478ACP/CP/EP MAX479ACP/CP/EP MAX478CS/ES 8 18 MAX479CS/ES 9 25 µv Long-Term Input Offset- Voltage Stability V OS Time.5.6 µv/mo. Input Offset Current I OS na Input Bias Current I B na Input Noise Voltage e n.1hz to 1Hz (Note 1) µv p-p Input Noise Voltage fo = 1Hz (Note 1) Density fo = Hz (Note 1) nv/ Hz Input Noise Current i n.1hz to 1Hz (Note 1) pa p-p Input Noise Current fo = 1Hz (Note 1) Density fo = Hz.1.1 pa/ Hz Differential mode (Note 1) Input Resistance R IN Common mode GΩ Upper limit Input Voltage Range V IN (CM) Lower limit V CMRR V CM = V to 3.5V db PSRR V S = 2.2V to 12V db V O =.3V to 4V, no load Large-Signal Voltage Gain A VOL (Note 1) V O =.3V to 3.5V, R L = 5kΩ V/mV 2

4 ELECTRICAL CHARACTERISTICS: 5V (continued) (, V CM =.1V, V O = 1.4V,, unless otherwise noted.) Output Voltage Swing V OUT MAX478AC MAX479AC MAX478C/E MAX479C/E Output low, no load Output low, 2kΩ to GND Output low, I SINK = µa Output high, no load Output high, 2kΩ to GND Slew Rate SR A V = +1, C L = 1pF (Note 1) V/µs Gain-Bandwidth Product GBW f O 5kHz 6 6 khz Supply Current per I S Amplifier V S = ±1.5V, V O = V mv V µa Channel Separation V IN = 3V, R L = 1kΩ db Minimum Supply Voltage V S (Note 2) V ELECTRICAL CHARACTERISTICS: 5V (, V CM =.1V, V O = 1.4V, T A = C to +7 C, unless otherwise noted.) Input Offset Voltage Input Offset Voltage Drift V OS V OS T MAX478AC MAX479AC MAX478C MAX479C MAX478ACP/CP MAX479ACP/CP MAX478CS 12 3 MAX479CS 13 4 MAX47_ACP/CP (Note 1) MAX47_CS (Note 1) Input Offset Current I OS na Input Bias Current I B na Large-Signal Voltage Gain Output Voltage Swing CMRR V CM = V to 3.4V db PSRR V S = 2.5V to 12V db V O =.5V to 4V, no load (Note 1) A VOL V O =.5V to 3.5V, R L = 5kΩ V OUT Output low, no load Output low, I SINK = µa Output high, no load Output high, 2kΩ to GND Supply Current per Amplifier I S µa µv µv/ C V/mV mv V 3

5 ELECTRICAL CHARACTERISTICS: 5V (, V CM =.1V, V O = 1.4V, T A = -4 C to +85 C, unless otherwise noted.) Input Offset Voltage Drift V OS T MAX478EP MAX479EP MAX478ES MAX479ES Input Offset Voltage V OS MAX MAX (Note 1) µv/ C Input Offset Current I OS na Input Bias Current I B na Large-Signal Voltage Gain Output Voltage Swing CMRR V CM =.5V to 3.2V db PSRR V S = 3.V to 12V db V O =.5V to 4V, no load (Note 1) A VOL V O =.5V to 3.5V, R L = 5kΩ V OUT Output low, no load Output low, I SINK = µa Output high, no load Output high, 2kΩ to GND Supply Current per Amplifier I S µa µv V/mV mv V 4

6 ELECTRICAL CHARACTERISTICS: 3V (V S = 3V, V, V CM =.1V, V O =.8V,, unless otherwise noted.) MAX478AC MAX479AC MAX478C/E MAX479C/E MAX478ACP/CP/EP Input Offset Voltage V OS MAX479ACP/CP/EP MAX478CS/ES 8 2 µv MAX479CS/ES 9 27 Input Offset Current I OS.5.5 na Input Bias Current I B 3 3 na Input Noise Voltage e N.1Hz to 1Hz µv p-p Upper limit Input Voltage Range V IN (CM) V Lower limit CMRR V CM = V to 1.7V db PSRR V S = 2.2V to 12V db Large-Signal Voltage Gain Output Voltage Swing V O =.3V to 2V, no load 6 6 A VOL (Note 1) V OUT V O =.3V to 1.5V, R L = 5kΩ Output low, no load Output low, 2kΩ to GND Output high, no load Output high, 2kΩ to GND Gain-Bandwidth Product GBW f O 5kHz 5 5 khz Supply Current per Amplifier I S µa Minimum Supply Voltage V S With 3µV V OS degradation V/mV mv V V 5

7 ELECTRICAL CHARACTERISTICS: ±15V (,, unless otherwise noted.) Input Offset Current I OS MAX478AC MAX479AC MAX478C/E MAX479C/E Input Offset Voltage V OS µv Input Bias Current I B na Upper limit Input Voltage Range V IN (CM) V Lower limit CMRR V CM = +13.5V, -15V db Large-Signal Voltage Gain na PSRR to ±15V db V O = ±1V, R L = 5kΩ A VOL V O = ±1V, no load R L = 5kΩ ±13. ±14.2 ±13. ±14.2 Output Voltage Swing V OUT V R L = 2kΩ ±11. ±12.7 ±11. ±12.7 Slew Rate SR A V = +1V, C L = 15pF V/µs Gain-Bandwidth Product GBW f O 5kHz khz I S Supply Current per Amplifier µa V/mV 6

8 ELECTRICAL CHARACTERISTICS: ±15V (, T A = C to +7 C, unless otherwise noted.) MAX478AC MAX479AC MAX478C MAX479C Input Offset Voltage V OS Input Offset-Voltage Drift V OS MAX47_ACP/CP (Note 1) T MAX47_CS (Note 1) Input Offset Current I OS na Input Bias Current I B na Large-Signal Voltage Gain µv/ C A VOL V O = ±1V, R L = 5kΩ V/mV CMRR V CM = +13V, -15V db PSRR to ±15V db µv Output Voltage Swing V OUT R L = 5kΩ ±11. ±13.5 ±11. ±13.5 V Supply Current per Amplifier I S µa 7

9 ELECTRICAL CHARACTERISTICS: ±15V (, T A = -4 C to +85 C, unless otherwise noted.) Input Offset Voltage Input Offset-Voltage Drift Input Offset Current Input Bias Current Large-Signal Voltage Gain V OS V OS T I OS I B MAX478EP MAX479EP MAX478ES MAX479ES (Note 1) CMRR V CM = +13V, -14.9V db µv/ C na A VOL V O = ±1V, R L = 5kΩ 5 5 V/mV PSRR to ±15V db µv na Output Voltage Swing V OUT R L = 5kΩ ±11. ±13.5 ±11. ±13.5 V Supply Current per Amplifier I S µa Note 1: Note 2: Guaranteed by design. Power-supply rejection ratio is measured at the minimum supply voltage. The op amps actually work at 1.7V supply, but with additional input offset-voltage skew. 8

10 Typical Operating Characteristics SUPPLY CURRENT PER AMPLIFIER (µa) SUPPLY CURRENT vs. TEMPERATURE V S = ±1.5V TEMPERATURE ( C) OFFSET-VOLTAGE SHIFT (µv) MINIMUM SUPPLY VOLTAGE +85 C NON-FUNCTIONAL C -4 C POSITIVE SUPPLY VOLTAGE (V) 3 VOLTAGE GAIN (db) VOLTAGE GAIN vs. FREQUENCY k k FREQUENCY (Hz) VOLTAGE GAIN (db) VOLTAGE GAIN (V/V) k 1M 1M k GAIN 5V, V, GAIN, PHASE vs. FREQUENCY GAIN ±15V k PHASE ±15V FREQUENCY (Hz) PHASE 5V, V VOLTAGE GAIN vs. LOAD RESISTANCE,, T A = +85 C M PHASE SHIFT (DEGREES) CMRR (db) OVERSHOOT (%) COMMON-MODE REJECTION RATIO vs. FREQUENCY 1 1 1k 1k k FREQUENCY (Hz) CAPACITIVE LOAD HANDLING A V = +1 A V = +5 A V = +1 PSRR (db) SATURATION VOLTAGE (mv) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY NEGATIVE SUPPLY POSITIVE SUPPLY V S = ±2.5V + 1V p-p SINE WAVE k 1k k FREQUENCY (Hz) OUTPUT SATURATION vs. TEMPERATURE NO LOAD I SINK = 1mA I SINK = µa I SINK = 1µA 1kΩ TO GROUND 2kΩ TO GROUND 1k 1k k 1M LOAD RESISTANCE TO GROUND (Ω) 1M 1 CAPACITIVE LOAD (pf) 1, TEMPERATURE ( C) 9

11 Typical Operating Characteristics (continued) VOLTAGE NOISE DENSITY (nv/ Hz) CURRENT NOISE DENSITY (fa/ Hz) 3 3 NOISE SPECTRUM CURRENT NOISE 1/f CORNER.5Hz k FREQUENCY (Hz) V S = ±2.5V VOLTAGE NOISE SHORT-CIRCUIT CURRENT (ma) SINKING SOURCING SHORT-CIRCUIT CURRENT 1 V S = ±2.5V V S = ±2.5V TIME FROM OUTPUT SHORT TO GROUND (MINUTES) 2 INPUT OFFSET CURRENT (pa) INPUT BIAS CURRENT (na) INPUT BIAS AND OFFSET CURRENT vs. TEMPERATURE -25 I OS I B TEMPERATURE ( C) LARGE-SIGNAL TRANSIENT RESPONSE LARGE-SIGNAL TRANSIENT RESPONSE SMALL-SIGNAL TRANSIENT RESPONSE V S = ±2.5V OUTPUT VOLTAGE (5V/div) OUTPUT VOLTAGE (1V/div) V 2V V OUTPUT VOLTAGE (2mV/div) TIME (5µs/div) A V = +1, C L = 15pF TIME (µs/div) A V = +1, C L = 15pF TIME (2µs/div) A V = +1, C L = 15pF SMALL-SIGNAL TRANSIENT RESPONSE SMALL-SIGNAL TRANSIENT RESPONSE OUTPUT VOLTAGE (2mV/div) mv OUTPUT VOLTAGE (2mV/div) V TIME (2µs/div) A V = +1, C L = 15pF TIME (2µs/div) A V = +1, C L = 15pF 1

12 Typical Application Circuit IN+ 1/4MAX479 1/4MAX479 R1 RG 1M 2k 1/4MAX479 GAIN = (1 + 2R1 ) ( R3 ) = FOR VALUES SHOWN RG R2 LOW-POWER INSTRUMENTATION AMPLIFIER R2 1M R1 1M R2 1M R3 9.1M R3 9.1M OUTPUT Chip Topograqhy INA+ OUTA V+ OUTB IN- INA- INB-.111" (2.82mm) INB+ V- V+.79" (2.1mm) Package Information SOICN.EPS 11

13 Package Information (continued) PDIPN.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.