Not Recommended for New Designs
This product was manufactured for Maxim by an outside wafer foundry
using a process that is no longer available. It is not recommended for
new designs. The data sheet remains available for existing users.
A Maxim replacement or an industry second-source may be available.
Please see the QuickView data sheet for this part or contact technical
support for assistance.
For further information,
contact Maxim’s Applications Tech Support.
19-3001; Rev 1; 10/05
Ultra-Low Offset
Voltage Operational Amplifier
General Description
The MAX400 guaranteed maximum 10µV offset error is
the lowest input offset voltage of any commercially avail-
able (nonchopper) monolithic amplifier. The MAX400
represents a 2.5 times improvement over the highest
grade OP07 (the OP07A), and a 5 times improvement
over the best commercial temperature range device
(OP07E). The offset voltage drift is guaranteed to be a
maximum of 0.3µV/°C which is also an improvement
over the OP07 family.
For the ultimate in DC performance (5µV maximum
offset voltage and 0.05µV/°C maximum offset voltage
drift) the MAX420 and MAX430 series of ±15V monolithic,
chopper-stabilized amplifiers should be consulted.
Features
♦
Ultra-Low Offset Voltage: 10µV (max)
♦
Ultra-Low Offset Voltage Drift: 0.2µV/°C
♦
Ultra Stable vs. Time: 0.2µV/month
♦
Ultra-Low Noise: 0.35µV
P-P
♦
Wide Supply Voltage: ±3V to ±18V
♦
High Common-Mode Input: ±14V
♦
No External Components Required
♦
Fits OP07, AD510, 725, 108A/308A Sockets
MAX400
Applications
Precision Amplifiers
Thermocouple Amplifiers
Low-Level Signal Processing
Medical Instrumentation
Strain Gauge Amplifiers
High-Accuracy Data Acquisition
PART
MAX400MJA
MAX400MTV
MAX400EJA
MAX400ETV
MAX400CTV
MAX400CPA
MAX400CSA
Ordering Information
TEMP RANGE
-55°C to +125°C
-55°C to +125°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
PIN-PACKAGE
8 CERDIP
8 TO-99
8 CERDIP
8 TO-99
8 TO-99
8 Plastic Dip
8 SO
Pin Configuration
TOP VIEW
Typical Operating Circuit
+V
S
V
OS
TRIM
V
OS
TRIM
8
1
7
V+
MAX400
V
OUT
-IN
2
MAX400
3
4
V-
5
6
V
OUT
-V
S
+IN
N.C.
+V
S
LOAD
CELL
MAX400
TO-99
V
OS
TRIM
1
-IN
2
8
7
V
OS
TRIM
V+
V
OUT
N.C.
-V
S
MAX400
+IN
3
6
5
V-
4
LOAD CELL AMPLIFIER
DIP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ultra-Low Offset
Voltage Operational Amplifier
MAX400
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to V-) ...........................................±22V
Internal Power Dissipation.................................................500mV
TO-99 (T) (derate at 7.1mW/ above +80°C)
Hermatic Dip (J) (derate 6.7mW/°C above +75°C)
Plastic Dip (P) (derate 5.6mW/°C above +36°C)
Differential Input Voltage .....................................................±30V
Input Voltage (Note 1)..........................................................±22V
Storage Temperature Range .............................-65°C to +150°C
Operating Temperature Range
MAX400M ......................................................-55°C to +125°C
MAX400E .........................................................-40°C to +85°C
MAX400C ............................................................0°C to +70°C
Lead Temperature (soldering, 10s) .................................+300°C
Duration of Output Short Circuit ....................................Indefinite
Junction Temperature (T
J
).................................-65°C to +160°C
Note 1:
For supply voltages less than ±22V, the absolute maximum input voltage is equal to the supply voltage.
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
(V
S
= ±15V,
T
A
= +25°C,
unless otherwise noted.)
PARAMETER
Input Offset Voltage
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
Differential Mode
Input Resistance
Common Mode
Input Voltage Range
Common-Mode
Rejection Ratio
Power-Supply Rejection
Ratio
Large-Signal Voltage
Gain
SYMBOL
V
OS
V
OS
/Time
I
OS
I
B
e
N(P-P)
e
N
I
N(P-P)
I
N
0.1Hz to 10Hz
f
O
= 10Hz
f
O
= 100Hz
f
O
= 1000Hz
0.1Hz to 10Hz
f
O
= 10Hz
f
O
= 100Hz
f
O
= 1000Hz
R
IN
R
INCM
IVR
CMRR
PSRR
V
CM
= ±13V
V
S
= ±3V to ±18V
R
L
≥
2kΩ, V
O
= ±10V
A
VO
R
L
≥
500Ω, V
O
= ±0.5V,
V
S
= ±3V (Note 4)
500
150
±13
114
(Note 4)
30
CONDITIONS
(Note 2)
(Note 3)
MAX400M
MIN
TYP
4
0.2
0.3
±0.7
0.35
10.3
10.0
9.6
14
0.32
0.14
0.12
80
200
±14
126
4
1000
400
10
500
150
±13
114
20
2.0
±2.0
MAX
10
MIN
MAX400C/E
TYP
10
0.2
0.3
±0.7
0.35
10.3
10.0
9.6
14
0.32
0.14
0.12
60
200
±14
126
4
1000
400
V/mV
10
MΩ
GΩ
V
dB
µV/V
pA/√Hz
pA
P-P
nV/√Hz
2.0
±2.0
MAX
15
UNITS
µV
µV/
month
nA
nA
µV
P-P
2
_______________________________________________________________________________________
Ultra-Low Offset
Voltage Operational Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
S
= ±15V,
T
A
= +25°C,
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
R
L
≥
10kΩ
Output Voltage Swing
Slew Rate
Closed-Loop Bandwidth
Open-Loop Output
Resistance
Power Consumption
Offset Adjustment Range
V
O
SR
BW
R
O
P
D
R
L
≥
2kΩ
R
L
≥
1kΩ
R
L
≥
2kΩ
A
VCL
= +1V
V
O
= 0V, I
O
= 0
V
S
= ±15V, no load
V
S
= ±3V, no load
R
P
= 20kΩ
MAX400M
MIN
±12.5
±12.0
±10.5
TYP
±13.0
±12.8
±12.0
0.3
0.6
60
75
4
±4
120
6
MAX
MIN
±12.5
±12.0
±10.5
MAX400C/E
TYP
±13.0
±12.8
±12.0
0.3
0.6
60
75
4
±4
120
6
V/µS
MHz
Ω
mW
mV
V
MAX
UNITS
MAX400
Note 2:
V
OS
is measured one minute after application of power.
Note 3:
Long-term Input Offset Voltage Stability refers to the average trend line of V
OS
vs. Time over extended periods after the first
30 days of operation. Excluding the initial hour of operation, changes in V
OS
during the first 30 operating days are typically
2.5µV – refer to typical performance curves.
Note 4:
Guaranteed by design.
ELECTRICAL CHARACTERISTICS
(V
S
= ±15V,
T
A
= full operating temperature range,
unless otherwise noted.)
PARAMETER
Input Offset Voltage
Average Temperature
Coefficient of Input
Offset Voltage
Input Offset Current
Average Input Offset
Current Drift
Input Bias Current
Average Input Bias
Current Drift
Input Voltage Range
Common-Mode
Rejection Ratio
Power-Supply Rejection
Ratio
Large-Signal Voltage
Gain
Output Voltage Swing
SYMBOL
V
OS
TCV
OS
I
OS
TCI
OS
I
B
TCI
B
IVC
CMRR
PSRR
A
VO
V
D
V
CM
= ±13V
V
S
= ±3V to ±18V
R
L
≥
2kΩ, V
O
= ±10V
R
L
≥
2kΩ
200
±12.0
±13
106
CONDITIONS
(Note 5)
(Note 6)
MAX400M
MIN
TYP
20
0.2
0.8
5
±1.0
8
±13.5
123
5
400
±12.6
20
200
±12.0
±13
106
±4.0
MAX
40
0.3
4.0
MIN
MAX400C/E
TYP
20
0.2
0.8
5
±1.0
8
±13.5
123
5
400
±12.6
20
±4.0
MAX
40
0.3
4.0
UNITS
µV
µV/°C
nA
pA/°C
nA
pA/°C
V
dB
µV/V
V/mV
V
Note 5:
Offset Voltage is measured one minute after application of power.
Note 6:
100% tested.
_______________________________________________________________________________________
3
Ultra-Low Offset
Voltage Operational Amplifier
MAX400
V+
100Ω
20kΩ
1
-
INPUT
+
3
2
8
7
MAX400
2
7
6
3.3kΩ
OUTPUT
4.7µF
(≈10Hz FILTER)
MAX400
V+
100Ω
6
OUTPUT
3
4
V-
2.5MΩ
4
V-
INPUT-REFERRED NOISE =
V
0
25,000
Figure 1. Optional Offset Nulling Circuit
Figure 2. Low-Frequency Noise Test Circuit
Typical Operating Characteristics
MAXIMUM OUTPUT SWING
vs. FREQUENCY
MAX400 toc01
LOW-FREQUENCY NOISE
MAX400 toc02
TOTAL INPUT NOISE VOLTAGE
vs. FREQUENCY
R
S1
= R
S2
= 200kΩ
THERMAL NOISE OF SOURCE
INPUT NOISE VOLTAGE (nV
√
Hz)
RESISTORS INCLUDED
MAX400 toc03
28
PEAK-TO-PEAK AMPLITUDE (V)
24
20
16
12
8
4
0
1k
10k
100k
V
S
=
±15V
T
A
= +25°C
1000
100
RESISTORS EXCLUDED
10
V
S
=
±15V
T
A
= +25°C
1
R
S
= 0Ω
1M
1
10
100
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
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