Maxim MAX479ESD, MAX478ESA, MAX478EPA, MAX478CSA, MAX478CPA Datasheet

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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
IND­IND+

V-

V+

INA+

INA-

OUTA

MAX479

DIP/SO

5
6
7

10

9
8

INC+
INC­OUTC

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 micro­power, 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 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)
♦ 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

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

* Dice are specified at TA= +25°C, DC parameters only.

MAX478/MAX479

17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps

2 _______________________________________________________________________________________

Supply Voltage .............................................. ±22V

Differential Input Voltage....................................±30V

Input Voltage...................Equal to Positive Supply Voltage

...............................5V Below Negative Supply Voltage

Output Short-Circuit Duration.........................Continuous

Continuous Power Dissipation (T

A

= +70°C):

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).. ...727mW

14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .. 800mW
14-Pin Wide SO (derate 9.52mW/°C above +70°C) ...762mW

Operating Temperature Ranges:

MAX47_ACP_/C_ _...............................0°C to +70°C

MAX47_E_ _....................................-40°C to +85°C

Storage Temperature Range ...................-65°C to +150°C

Lead Temperature (soldering, 10sec)....................+300°C

ELECTRICAL CHARACTERISTICS: 5V

(VS= 5V, 0V, VCM= 0.1V, VO= 1.4V, TA= +25°C, unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL CONDITIONS

MAX478C/E
MAX479C/E

MIN TYP MAX

UNITS

Input Offset Voltage

V

OS

MAX478ACP/CP/EP 30 70 40 120

µV

MAX479ACP/CP/EP 35 100 40 150
MAX478CS/ES 80 180
MAX479CS/ES 90 250

∆V

OS

∆Time

0.5 0.6 µV/Mo.

I

OS

0.05 0.25 0.05 0.35 nA

Input Bias Current

I

B

35 36 nA

Input Noise Voltage

e

n

0.1Hz to 10Hz (Note 1) 0.9 2.0 0.9

µV

p-p

Input Noise Voltage
Density

fo= 10Hz (Note 1) 50 75 50

nV/√Hz

fo= 1000Hz (Note 1) 49 65 49

Input Noise Current

i

n

0.1Hz to 10Hz (Note 1) 1.5 2.5 1.5

pA

p-p

Input Noise Current
Density

fo= 10Hz (Note 1) 0.03

pA/√Hz

fo= 1000Hz 0.01 0.01

Input Resistance

R

IN

Differential mode (Note 1) 0.8 2.0 0.6 2.0

GΩ

Common mode 12 12

Input Voltage Range

V

IN (CM)

Upper limit 3.5 3.9 3.5 3.9

V

Lower limit 0 -0.3 0 -0.3

CMRR

V

CM

= 0V to 3.5V

93 103 90 102 dB

Power-Supply
Rejection Ratio

PSRR

V

S

= 2.2V to 12V

94 104 92 104 dB

Large-Signal Voltage Gain

A

VOL

140 700 110 700

V/mV

V

O

= 0.03V to 3.5V, RL= 50kΩ

80 200 70 200

MAX478AC
MAX479AC

MIN TYP MAX

Long-Term Input Offset­Voltage Stability

Input Offset Current

Common-Mode
Rejection Ratio

V

O

= 0.03V to 4V, no load

(Note 1)

0.03 0.07

MAX478/MAX479

17µA Max, Dual/Quad, Single-Supply,

Precision Op Amps

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS

MAX478AC
MAX479AC

MIN TYP MAX

MAX478C/E
MAX479C/E

MIN TYP MAX

UNITS

Output Voltage Swing

V

OUT

Output low, no load 6.5 9.0 6.5 9.0

mVOutput low, 2kΩ to GND 0.2 0.6 0.2 0.6

Output low, I

SINK

= 100µA

120 160 120 160

4.2 4.4
V

Output high, 2kΩ to GND 3.5 3.8 3.5 3.8

Slew Rate SR

A

V

= +1, CL= 1pF (Note 1)

0.013 0.025 0.013 0.025 V/µs

Gain-Bandwidth Product GBW

f

O

≤ 5kHz

60 60 kHz

Channel Separation

∆V

IN

= 3V, RL= 10kΩ

130 130 dB

Minimum Supply Voltage V

S

(Note 2) 2.0 2.2 2.0 2.2 V

I

S

13 18 14 21

µA

Supply Current per
Amplifier

V

S

= ±1.5V, VO= 0V

12 17 13 20

Output high, no load

ELECTRICAL CHARACTERISTICS: 5V (continued)

(VS= 5V, 0V, VCM= 0.1V, VO= 1.4V, TA= +25°C, unless otherwise noted.)

4.2 4.4

ELECTRICAL CHARACTERISTICS: 5V

(VS= 5V, 0V, VCM= 0.1V, VO= 1.4V, TA= 0°C to +70°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS

MAX478AC
MAX479AC

MIN TYP MAX

MAX478C
MAX479C

MIN TYP MAX

UNITS

MAX479CS 130 400

Input Offset Voltage

V

OS

MAX478ACP/CP 50 170 65 250

µV

MAX479ACP/CP 60 200 70 290
MAX478CS 120 300

Input Offset Voltage Drift

∆V

OS

∆T

MAX47_ACP/CP (Note 1) 0.5 2.2 0.6 3.0

µV/°C

MAX47_CS (Note 1) 0.8 4.5

Input Offset Current

I

OS

0.06 0.35 0.06 0.50 nA

Input Bias Current

I

B

36 37 nA

CMRR

V

CM

= 0V to 3.4V

90 101 86 100 dB

Power-Supply
Rejection Ratio

PSRR

V

S

= 2.5V to 12V

90 102 88 102 dB

Large-Signal
Voltage Gain

A

VOL

105 500 80 500

V/mV

55 160 45 160

Output Voltage Swing

V

OUT

Output low, no load 8 11 8 11

mV

Output low, I

SINK

= 100µA

140 190 140 190

Output high, no load 4.1 4.3 4.1 4.3

V

Output high, 2kΩ to GND 3.3 3.8 3.3 3.8

Supply Current per Amplifier

I

S

14 21 15 24 µA

Common-Mode
Rejection Ratio

V

O

= 0.05V to 4V, no load (Note 1)

V

O

= 0.05V to 3.5V, RL= 50kΩ

MAX478/MAX479

17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS: 5V

(VS= 5V, 0V, VCM= 0.1V, VO= 1.4V, TA= -40°C to +85°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS

MAX478EP
MAX479EP

MIN TYP MAX

MAX478ES
MAX479ES

MIN TYP MAX

UNITS

Input Offset Voltage Drift

∆V

OS

∆T

(Note 1) 0.6 3.0

0.8 4.5

µV/°C

Input Offset Current

I

OS

0.07 0.7 0.07 0.7 nA

Input Bias Current

I

B

48 48 nA

Common-Mode
Rejection Ratio

CMRR

V

CM

= 0.05V to 3.2V

84 98 84 98 dB

Input Offset Voltage

V

OS

MAX478 80 315 150 400

µV

Power-Supply
Rejection Ratio

PSRR

V

S

= 3.0V to 12V

86 100 86 100 dB

Large-Signal
Voltage Gain

A

VOL

VO= 0.05V to 4V, no load (Note 1)

55 350 55 350

V/mV

MAX479 80 345 160 530

V

O

= 0.05V to 3.5V, RL= 50kΩ

35 130 35 130

Output Voltage Swing

V

OUT

Output low, no load 9 13 9 13

mV

Output low, I

SINK

= 100µA

160 220 160 220

Output high, no load 3.9 4.2 3.9 4.2

V

Output high, 2kΩ to GND 3.0 3.7 3.0 3.7

Supply Current per Amplifier

I

S

15 27 15 27 µA