MAX478 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 17μA Max, Dual/Quad, Single-Supply, Precision Op Amps

19-0127; Rev. 1; 11/98
17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps
_______________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
MAX478ACPA
MAX478CPA
MAX478CSA
MAX478C/D
MAX478EPA
MAX478ESA
MAX479ACPD
MAX479CPD
MAX479CSD
MAX479EPD
MAX479ESD
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
14 Plastic DIP
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
* Dice are specified at T_A = +25°C, DC parameters only.
_________________Pin Configurations
__________Typical Operating Circuit
R3
R1
R2
R2
R1
+5V
1/2MAX478
V_OUT
V2
1/2MAX478
V1
V_OUT
=
(V1-V2)
(1
+
R1
R2
+
2
R1)
R3
MICROPOWER, HIGH INPUT IMPEDANCE DIFFERENTIAL
AMPLIFIER WITH VARIABLE GAIN IN 8-PIN DIP/SO
TOP VIEW
OUTA ₁
INA- 2
INA+ 3
V- 4
A
B
MAX478
DIP/SO
8 V+
7 OUTB
6 INB-
5 INB+
OUTA ₁
INA- 2
INA+ 3
V+ 4
INB+ 5
INB- 6
OUTB 7
14 OUTD
13 IND-
A
D
12 IND+
MAX479
11 V-
10 INC+
B
C
9 INC-
8 OUTC
DIP/SO
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