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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.
___________________________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
MAX478/MAX479
______________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
_______________________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
* Dice are specified at T
A
= +25°C, DC parameters only.
_________________Pin Configurations
TOP VIEW
OUTA
INA-
1
2
A
B
8
7
6
5
V+
OUTB
INB-
INB+
__________Typical Operating Circuit
R3
R1
R2
R2
R1
INA+
3
V-
4
MAX478
DIP/SO
+5V
1/2MAX478
OUTA
INA-
1
2
A
D
14
OUTD
13
IND-
12
IND+
V
OUT
V2
V1
INA+
3
V+
4
MAX479
B
C
11
V-
10
INC+
9
8
INC-
OUTC
1/2MAX478
R1
R1
V
OUT
= (V1-V2) (1 + + 2 )
R2
R3
MICROPOWER, HIGH INPUT IMPEDANCE DIFFERENTIAL
AMPLIFIER WITH VARIABLE GAIN IN 8-PIN DIP/SO
INB+
5
INB-
6
OUTB
7
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps
MAX478/MAX479
ABSOLUTE MAXIMUM RATINGS
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
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.
ELECTRICAL CHARACTERISTICS: 5V
(V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MAX478ACP/CP/EP
Input Offset Voltage
V
OS
MAX479ACP/CP/EP
MAX478CS/ES
MAX479CS/ES
Long-Term Input Offset-
Voltage Stability
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Voltage
Density
Input Noise Current
Input Noise Current
Density
Input Resistance
Input Voltage Range
Common-Mode
Rejection Ratio
Power-Supply
Rejection Ratio
Large-Signal Voltage Gain
R
IN
V
IN (CM)
CMRR
PSRR
i
n
∆V
OS
∆Time
I
OS
I
B
e
n
0.1Hz to 10Hz (Note 1)
fo = 10Hz (Note 1)
fo = 1000Hz (Note 1)
0.1Hz to 10Hz (Note 1)
fo = 10Hz (Note 1)
fo = 1000Hz
Differential mode (Note 1)
Common mode
Upper limit
Lower limit
V
CM
= 0V to 3.5V
V
S
= 2.2V to 12V
V
O
= 0.03V to 4V, no load
(Note 1)
V
O
= 0.03V to 3.5V, R
L
= 50kΩ
3.5
0
93
94
140
80
0.8
0.5
0.05
3
0.9
50
49
1.5
0.03
0.01
2.0
12
3.9
-0.3
103
104
700
200
3.5
0
90
92
110
70
0.6
0.25
5
2.0
75
65
2.5
0.07
MAX478AC
MAX479AC
MIN TYP MAX
30
35
70
100
MAX478C/E
MAX479C/E
MIN TYP MAX
40
40
80
90
0.6
0.05
3
0.9
50
49
1.5
0.03
0.01
2.0
12
3.9
-0.3
102
104
700
V/mV
200
0.35
6
120
150
180
250
µV/Mo.
nA
nA
µV
p-p
nV/√Hz
pA
p-p
pA/√Hz
GΩ
V
dB
dB
µV
UNITS
A
VOL
2
_______________________________________________________________________________________
17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps
ELECTRICAL CHARACTERISTICS: 5V (continued)
(V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Output low, no load
Output low, 2kΩ to GND
Output Voltage Swing
V
OUT
Output low, I
SINK
= 100µA
Output high, no load
Output high, 2kΩ to GND
Slew Rate
Gain-Bandwidth Product
Supply Current per
Amplifier
Channel Separation
Minimum Supply Voltage
V
S
SR
GBW
I
S
A
V
= +1, C
L
= 1pF (Note 1)
f
O
≤
5kHz
4.2
3.5
MAX478AC
MAX479AC
MIN TYP MAX
6.5
0.2
120
4.4
3.8
9.0
0.6
160
4.2
3.5
MAX478C/E
MAX479C/E
MIN TYP MAX
6.5
0.2
120
4.4
3.8
V
V/µs
kHz
21
µA
12
130
2.0
2.2
17
13
130
2.0
2.2
20
dB
V
9.0
0.6
160
mV
UNITS
MAX478/MAX479
0.013 0.025
60
13
18
0.013 0.025
60
14
V
S
= ±1.5V, V
O
= 0V
∆V
IN
= 3V, R
L
= 10kΩ
(Note 2)
ELECTRICAL CHARACTERISTICS: 5V
(V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 0°C to +70°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MAX478ACP/CP
Input Offset Voltage
V
OS
MAX479ACP/CP
MAX478CS
MAX479CS
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common-Mode
Rejection Ratio
Power-Supply
Rejection Ratio
Large-Signal
Voltage Gain
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
A
VOL
V
CM
= 0V to 3.4V
V
S
= 2.5V to 12V
V
O
= 0.05V to 4V, no load (Note 1)
V
O
= 0.05V to 3.5V, R
L
= 50kΩ
Output low, no load
Output Voltage Swing
V
OUT
Output low, I
SINK
= 100µA
Output high, no load
Output high, 2kΩ to GND
Supply Current per Amplifier
I
S
4.1
3.3
90
90
105
55
MAX47_ACP/CP (Note 1)
MAX47_CS (Note 1)
0.06
3
101
102
500
160
8
140
4.3
3.8
14
21
11
190
4.1
3.3
0.35
6
86
88
80
45
0.5
2.2
MAX478AC
MAX479AC
MIN TYP MAX
50
60
170
200
MAX478C
MAX479C
MIN TYP MAX
65
70
120
130
0.6
0.8
0.06
3
100
102
500
V/mV
160
8
140
4.3
3.8
15
24
11
190
mV
250
290
300
400
3.0
µV/°C
4.5
0.50
7
nA
nA
dB
dB
µV
UNITS
V
µA
_______________________________________________________________________________________
3
17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps
MAX478/MAX479
ELECTRICAL CHARACTERISTICS: 5V
(V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MAX478
MAX479
(Note 1)
MAX478EP
MAX479EP
MIN TYP MAX
80
80
0.6
0.07
4
V
CM
= 0.05V to 3.2V
V
S
= 3.0V to 12V
V
O
= 0.05V to 4V, no load (Note 1)
V
O
= 0.05V to 3.5V, R
L
= 50kΩ
Output low, no load
Output Voltage Swing
V
OUT
Output low, I
SINK
= 100µA
Output high, no load
Output high, 2kΩ to GND
Supply Current per Amplifier
I
S
3.9
3.0
84
86
55
35
98
100
350
130
9
160
4.2
3.7
15
27
13
220
3.9
3.0
315
345
3.0
0.7
8
84
86
55
35
MAX478ES
MAX479ES
MIN TYP MAX
150
160
0.8
0.07
4
98
100
350
V/mV
130
9
160
4.2
3.7
15
27
13
220
mV
400
µV
530
4.5
0.7
8
µV/°C
nA
nA
dB
dB
UNITS
Input Offset Voltage
V
OS
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
A
VOL
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common-Mode
Rejection Ratio
Power-Supply
Rejection Ratio
Large-Signal
Voltage Gain
V
µA
4
_______________________________________________________________________________________
17µA Max, Dual/Quad, Single-Supply,
Precision Op Amps
ELECTRICAL CHARACTERISTICS: 3V
(V
S
= 3V, 0V, V
CM
= 0.1V, V
O
= 0.8V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MAX478ACP/CP/EP
Input Offset Voltage
V
OS
MAX479ACP/CP/EP
MAX478CS/ES
MAX479CS/ES
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Voltage Range
Common-Mode
Rejection Ratio
Power-Supply
Rejection Ratio
Large-Signal
Voltage Gain
I
OS
I
B
e
N
V
IN (CM)
CMRR
PSRR
0.1Hz to 10Hz
Upper limit
Lower limit
V
CM
= 0V to 1.7V
V
S
= 2.2V to 12V
V
O
= 0.03V to 2V, no load
(Note 1)
V
O
= 0.03V to 1.5V, R
L
= 50kΩ
Output low, no load
Output Voltage Swing
V
OUT
Output low, 2kΩ to GND
Output high, no load
Output high, 2kΩ to GND
Gain-Bandwidth Product
Supply Current per Amplifier
Minimum Supply Voltage
GBW
I
S
V
S
f
O
≤
5kHz
2.2
1.8
1.7
0
93
94
0.05
3
1.0
1.9
-0.3
103
104
1.7
0
90
92
MAX478AC
MAX479AC
MIN TYP MAX
30
35
90
120
MAX478C/E
MAX479C/E
MIN TYP MAX
40
40
80
90
0.05
3
1.0
1.9
-0.3
102
104
140
170
200
270
nA
nA
µV
p-p
V
dB
dB
µV
UNITS
MAX478/MAX479
A
VOL
100
30
600
180
6
0.2
2.4
2.0
50
12
17
2.2
9
0.6
100
30
600
V/mV
180
6
0.2
9
0.6
mV
2.2
1.8
2.4
2.0
50
13
20
2.2
V
kHz
µA
V
With 300µV V
OS
degradation
1.7
1.7
_______________________________________________________________________________________
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