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EVALUATION KIT AVAILABLE
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
General Description
The MAX4208/MAX4209 ultra-low offset and drift instrumen-
tation amplifiers feature exceptional precision specifications,
low power consumption, rail-to-rail output, excellent gain-
bandwidth product, and buffered REFIN/MODE input in a
very small μMAX® package. These devices use a spread-
spectrum, autozeroing technique that constantly measures
and corrects the input offset, eliminating drift over time
and temperature and the effect of 1/f noise. This technique
achieves less than 20μV offset voltage, allows ground-sens-
ing capability, provides ultra-low CMOS input bias current
and increased common-mode rejection performance.
The MAX4208/MAX4209 provide high-impedance inputs
optimized for small-signal differential voltages (±100mV).
All devices provide a gain-bandwidth product of 750kHz.
The MAX4208 provides an adjustable gain with two exter-
nal resistors or unity gain with FB connected to OUT. The
MAX4209 is available with a fixed gain of 100V/V with
±0.03% (typ) accuracy. Both devices include a reference
input (REF) to level-shift the output, allowing for bipolar sig-
nals in single-supply applications. In both devices, REFIN/
MODE is an input to a precision unity-gain buffer, which
sets the REF voltage to level-shift the output. The internal
REF buffer allows the reference to be set by a simple resis-
tive divider or an ADC reference without any loading error.
The MAX4208/MAX4209 operate with a 2.85V to 5.5V
single-supply voltage and consume only 750μA of qui-
escent current (when the internal buffer is off) and only
1.4μA in shutdown mode. These amplifiers also operate
with ±2.5V dual supplies with REF connected to ground
and REFIN/MODE to VSS. The MAX4208/MAX4209 are
available in space-saving 8-pin μMAX packages and
are specified over the automotive operating temperature
range (-40°C to +125°C).
Applications
Strain-Gauge Amplifiers
● Industrial Process Control
● Battery-Powered Medical Equipment
● Precision Low-Side Current Sense
● Notebook Computers
Differential Voltage Amplification
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Benefits and Features
● Spread-Spectrum, Auto-Zero Instrumentation
Amplifiers Improve DC Characteristics to Maximize
Sensor Performance
• Input Offset Voltage: ±20μV (max) at +25°C
• ±0.25% (max) Gain Error
• Low 0.2μV/°C Offset Voltage Drift
1pA CMOS Input Bias Current
True Ground Sensing with Rail-to-Rail Output
750kHz Gain-Bandwidth Product
● Buffered REF Input for High Accuracy and Bipolar
Operation
● Low Power Operation Supports Remote Sensing and
Battery-Powered Applications
• 2.85V to 5.5V Single-Supply Operation (or ±1.425V
to ±2.75V Dual Supplies)
• 750μA Supply Current
• 1.4μA Shutdown Mode
Adjustable (MAX4208) and Fixed Gain of 100
(MAX4209) Provide Design Flexibility
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX4208AUA+T -40°C to +125°C 8 µMAX
MAX4209HAUA+T -40°C to +125°C 8 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
GAIN
(V/V)
ADJ
100
Typical Application Circuit
5V
R4
VDD/2
R3
MAX4208
G
=
1
+
R2
R1
IN-
IN+ VDD
REFIN/MODE
REF VSS
FB
OUT
R2 CFB
FB
R1
REF BUFFER OUT =
VDD/2
19-0924; Rev 3; 5/15

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MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Absolute Maximum Ratings
VDD to VSS...............................................................-0.3V to +6V
All Other Pins................................. (VSS - 0.3V) to (VDD + 0.3V)
OUT Short-Circuit Duration........................................Continuous
Current Into OUT, VDD, and VSS......................................±25mA
Current Into Any Other Pin................................................±20mA
Continuous Power Dissipation (TA = +70°C)
μMAX (derate 4.5mW/°C above +70°C)......................362mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +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
(VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, VREFIN/MODE = VSS, RL = 100kΩ to VDD/2, VDIFF = (VIN+ - VIN-) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
INPUT DC CHARACTERISTICS
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Resistance
Gain Error
Gain Nonlinearity
(Note 2)
Input Common-Mode Range
Input Common-Mode Rejection
Ratio
SYMBOL
CONDITIONS
VOS
IB
IOS
RIN
VCM
CMRR
MAX4208, G = 100V/V
MAX4209H, G = 100V/V
-100mV ≤ VDIFF ≤ +100mV (Note 3)
-100mV ≤ VDIFF ≤ +100mV (Note 3)
VCM = VDD/2
Differential mode
Common mode
-20mV ≤ VDIFF ≤ +20mV
MAX4208, G = 100V/V
-20mV ≤ VDIFF ≤ +20mV
MAX4209H, G = 100V/V
MAX4208, G = 100V/V
MAX4209H, G = 100V/V
Guaranteed by CMRR test
VCM = (VSS - 0.1V) to (VDD - 1.30V)
MIN TYP MAX UNITS
±3 ±20
µV
±3 ±20
1 pA
1 pA
2
GΩ
2
0.05 ±0.25
0.05 ±0.25
%
VSS - 0.1
25 150
25 150
VDD - 1.30
106 135
ppm
V
dB
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Maxim Integrated 2

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MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Electrical Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, VREFIN/MODE = VSS, RL = 100kΩ to VDD/2, VDIFF = (VIN+ - VIN-) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Power-Supply Rejection Ratio
PSRR
VDD = 2.85V to 5.5V, VREF = VCM =
(VSS + 0.5V)
REFIN/MODE AND REF DC CHARACTERISTICS
REFIN/MODE Buffer Input Offset
Voltage
(Note 2)
MIN
100
REFIN/MODE Input Voltage Low
VIL Reference buffer is OFF
REFIN/MODE Input Voltage High
VIH Shutdown mode
REFIN/MODE Buffered
Reference Input Range
VREFIN/MODE
Reference buffer is ON, guaranteed by
REFIN/MODE CMRR test
REFIN/MODE Buffer
Common-Mode Rejection Ratio
(VSS + 0.2V) ≤ VREF/MODE ≤ (VDD - 1.3V)
(Note 2)
REFIN/MODE Buffer
Power-Supply Rejection Ratio
REFIN/MODE Bias Current
REF Common-Mode Range
IREFIN
VDD = 2.85V to 5.5V, VREF/MODE = VCM
= (VSS + 0.5V)
VSS < VREFIN/MODE < VDD (Note 3)
Guaranteed by reference CMRR test
(Note 4)
REF Common-Mode Rejection
Ratio
VSS ≤ VREF ≤ (VDD - 1.30V)
(Note 4)
REF, FB Bias Current
MAX4208 (Note 3)
REF Input Current (MAX4209)
OUTPUT DC CHARACTERISTICS
IREF
VDIFF = 0V (Note 5)
VDIFF = ±100mV (Note 5)
Output Voltage Swing
(Notes 6 and 7)
Short-Circuit Current
VOH
VDD - VOUT
VOL VOUT - VSS
Source
ISC Sink
RL = 100kΩ
RL = 10kΩ
RL = 1kΩ
RL = 100kΩ
RL = 10kΩ
RL = 1kΩ
Short-Circuit Recovery Time
AC CHARACTERISTICS
Gain-Bandwidth Product
GBW MAX4208, G = 1V/V
Small-Signal Bandwidth
BW MAX4209H, G =100V/V
Slew Rate (Note 8)
SR MAX4208, G = 1V/V, VOUT = 100mV step
VDD -
0.2
VSS +
0.2
106
100
VSS
106
TYP
125
±10
VSS
VDD
135
125
1
135
1
±10
±100
30
50
250
30
50
250
+20
-25
0.50
750
7.5
80
MAX
±40
VSS +
0.05
VDD -
1.3
VDD -
1.30
45
70
325
40
65
285
UNITS
dB
µV
V
V
V
dB
dB
pA
V
dB
pA
nA
µA
mV
mA
ms
kHz
kHz
V/ms
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Maxim Integrated 3

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MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Electrical Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, VREFIN/MODE = VSS, RL = 100kΩ to VDD/2, VDIFF = (VIN+ - VIN-) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Settling Time
Maximum Capacitive Load
Input Voltage Noise
Power-Up Time
Shutdown Enable/Disable
Time
POWER SUPPLY
Supply Voltage
Supply Current
SYMBOL
CONDITIONS
tS To within 0.1% of final value
CL No sustained oscillations
f = 0.1Hz to 10Hz
en f = 1kHz
To within 0.1% of final value
MAX4208,
G = 1V/V
MAX4209H
tEN, tDIS
VDD
IDD
Guaranteed by PSRR test
VREFIN/MODE = VSS,
buffer OFF
VDD = 5V
(VSS + 0.2V) ≤ VREFIN/MODE
(VDD - 1.3V), buffer ON
VDD = 5V
VREFIN/MODE = VDD, shutdown mode
MIN TYP MAX UNITS
10
µs
120
200 pF
2.5 µVP-P
140 nV/√Hz
20 ms
20 ms
2.85
0.75
5.50
1.30
1.40
1.4
2.30
5.0
V
mA
µA
Electrical Characteristics
(VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, VREFIN/MODE = VSS, RL = 100kΩ to VDD/2, VDIFF = (VIN+ - VIN-) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), TA = -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
INPUT DC CHARACTERISTICS
Input Offset Voltage
Input Offset Voltage
Temperature Drift
(Note 2)
Input Bias Current
Gain Error
VOS
TCVOS
MAX4208, G = 100V/V
MAX4209H, G = 100V/V
MAX4208, G = 100V/V
MAX4209H, G = 100V/V
-100mV ≤ VDIFF < +100mV
(Note 3)
MAX4208, G = 100V/V,
-20mV ≤ VDIFF ≤ +20mV
MAX4209H, G = 100V/V,
-20mV ≤ VDIFF ≤ +20mV
TA = +25°C to +85°C
TA = -40°C to +125°C
TA = +25°C to +85°C
TA = -40°C to +125°C
TA = +25°C to +85°C
TA = -40°C to +125°C
TA = +25°C to +85°C
TA = -40°C to +125°C
TA = +85°C
TA = +125°C
TA = +25°C to +85°C
TA = -40°C to +125°C
TA = +25°C to +85°C
TA = -40°C to +125°C
MIN TYP MAX UNITS
0.1
0.1
0.01
0.01
10
20
±45
±60
±30
±40
±0.45
±0.45
±0.17
±0.17
0.30
0.35
0.30
0.35
µV
µV/°C
pA
%
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Maxim Integrated 4

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MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Electrical Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, VREFIN/MODE = VSS, RL = 100kΩ to VDD/2, VDIFF = (VIN+ - VIN-) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), TA = -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Gain Error Temperature
Drift (Note 2)
-20mV ≤ VDIFF ≤ +20mV
(MAX4208),
TA = -40°C to +125°C
G = 100V/V
-20mV ≤ VDIFF ≤ +20mV
(MAX4209H),
TA = -40°C to +125°C
G = 100V/V
50 180
ppm/°C
50 180
Gain Nonlinearity
(Note 2)
Input Common-Mode
Range
Input Common-Mode
Rejection Ratio
Power-Supply Rejection
Ratio
GNL
VCM
CMRR
PSRR
MAX4208,
G = 100V/V
TA = +25°C to +85°C
TA = -40°C to +125°C
MAX4209H,
G = 100V/V
TA = +25°C to +85°C
TA = -40°C to +125°C
Guaranteed by CMRR test,
TA = -40°C to +125°C
(VSS - 0.1V) ≤ VCM
(VDD - 1.6V)
TA = +25°C to +85°C
TA = -40°C to +125°C
VDD = 2.85V to 5.5V,
VREF = VCM = VSS +
0.5V
TA = +25°C to +85°C
TA = -40°C to +125°C
VSS - 0.1
96
90
96
90
210
700
ppm
210
700
VDD - 1.6 V
dB
dB
REFIN/MODE AND REF DC CHARACTERISTICS
REFIN/MODE Buffer Input
Offset Voltage
REFIN/MODE Buffered
Reference Input Range
TA = +25°C to +85°C
TA = -40°C to +125°C
VREFIN/MODE
Reference buffer is ON, guaranteed by REFIN/
MODE CMRR test
VSS + 0.2
100
100
VDD - 1.6
µV
V
REFIN/MODE Input
Voltage Low
VIL Reference buffer is OFF
VSS + 0.05 V
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Maxim Integrated 5