Rainbow Electronics MAX479 - Manual

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MAX478/MAX479
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
V OUT
MICROPOWER, HIGH INPUT IMPEDANCE DIFFERENTIAL
AMPLIFIER WITH VARIABLE GAIN IN 8-PIN DIP/SO
1/2MAX478
1/2MAX478
V
OUT
= (V1-V2) (1 +
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
♦ 17µA Max Supply Current (MAX478A/MAX479A)
♦ 70µV 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)
♦ 250pA Max Input Offset Current
(MAX478A/MAX479A)
♦ 0.5µV/°C Offset-Voltage Drift
♦ Output Sources and Sinks 5mA Load Current
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX478 ACPA 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
MAX479 ACPD 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
* Dice are specified at T
A
= +25°C, DC parameters only.