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17µA Max, Dual/Quad, Single-Supply,

Precision Op Amps

________________________________________________________________ Maxim Integrated Products

1

1

2

3

4

8

7

6

5

V+

OUTB

INB-

INB+

V-

INA+

INA-

OUTA

MAX478

DIP/SO

TOP VIEW

1

2

3

4

14

13

12

11

OUTD

IND-

IND+

V-

V+

INA+

INA-

OUTA

MAX479

DIP/SO

5

6

7

10

9

8

INC+

INC-

OUTC

OUTB

INB-

INB+

A

D

B

C

A

B

_________________Pin Configurations

V2

V1

R3

R1

R2

R2

R1

+5V

MICROPOWER, HIGH INPUT IMPEDANCE DIFFERENTIAL

AMPLIFIER WITH VARIABLE GAIN IN 8-PIN DIP/SO

1/2MAX478

1/2MAX478

R1

+ 2

R1

)

R2

R3

__________Typical Operating Circuit

19-0127; Rev. 1; 11/98

_______________General Description

The MAX478 and MAX479 are dual and quad micro-

power, precision op amps available in 8-pin and 14-pin

DIP and small-outline packages, respectively. Both

devices feature an extremely low, 17µA max supply

current per op amp, 70µV max offset voltage, 2.2µV/°C

max offset voltage drift (0.5µV/°C typ), and 250pA max

input offset current.

The MAX478 and MAX479 operate from a single sup-

ply. 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 sup-

ply 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

o 17µA Max Supply Current (MAX478A/MAX479A)

o 70µV Max Offset Voltage (MAX478A)

o Single-Supply Operation:

Input Voltage Range Includes Ground

Output Swings to Ground While Sinking Current

No Pull-Down Resistors Required

o Dual Op Amp in 8-Pin DIP/SO Package (MAX478)

Quad Op Amp in 14-Pin DIP/SO Package (MAX479)

o 250pA Max Input Offset Current

(MAX478A/MAX479A)

o 0.5µV/°C Offset-Voltage Drift

o Output Sources and Sinks 5mA Load Current

______________Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX478ACPA

0°C to +70°C

8 Plastic DIP

MAX478CPA

0°C to +70°C

8 Plastic DIP

MAX478CSA

0°C to +70°C

8 SO

MAX478C/D

0°C to +70°C

Dice*

MAX478EPA

-40°C to +85°C

8 Plastic DIP

MAX478ESA

-40°C to +85°C

8 SO

MAX479ACPD

0°C to +70°C

14 Plastic DIP

MAX479CPD

0°C to +70°C

14 Plastic DIP

MAX479CSD

0°C to +70°C

14 SO

MAX479EPD

-40°C to +85°C

14 Plastic DIP

MAX479ESD

-40°C to +85°C

14 SO