EVALUATION KIT AVAILABLE
MAX4208/MAX4209
General Description
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
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
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 V
SS
. 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).
Ordering Information
PART
MAX4208AUA+T
MAX4209HAUA+T
T = Tape and reel.
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
8 µMAX
8 µMAX
GAIN
(V/V)
ADJ
100
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Application Circuit
5V
R4
V
DD
/2
R3
IN-
IN+
REFIN/MODE
REF
FB
V
SS
V
DD
OUT
Applications
●
●
●
●
●
●
Strain-Gauge Amplifiers
Industrial Process Control
Battery-Powered Medical Equipment
Precision Low-Side Current Sense
Notebook Computers
Differential Voltage Amplification
R2
C
FB
MAX4208
G = 1 + R2
R1
FB
R1
REF
BUFFER OUT =
V
DD
/2
μMAX is a registered trademark of Maxim Integrated Products, Inc.
19-0924; Rev 3; 5/15
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Absolute Maximum Ratings
V
DD
to V
SS
..............................................................-0.3V
to +6V
All Other Pins ................................
(V
SS
- 0.3V) to (V
DD
+ 0.3V)
OUT Short-Circuit Duration .......................................Continuous
Current Into OUT, V
DD
, and V
SS
.....................................±25mA
Current Into Any Other Pin ...............................................±20mA
Continuous Power Dissipation (T
A
= +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
(V
DD
= 5V, V
SS
= 0V, V
CM
= V
REF
= V
DD
/2, V
REFIN/MODE
= V
SS
, R
L
= 100kΩ to V
DD
/2, V
DIFF
= (V
IN+
- V
IN-
) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ),
T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
INPUT DC CHARACTERISTICS
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Resistance
V
OS
IB
IOS
R
IN
MAX4208, G = 100V/V
MAX4209H, G = 100V/V
-100mV ≤ V
DIFF
≤ +100mV (Note 3)
-100mV ≤ V
DIFF
≤ +100mV (Note 3)
V
CM
= V
DD
/2
Differential mode
Common mode
±3
±3
1
1
2
2
0.05
0.05
25
25
V
SS
- 0.1
106
135
±0.25
%
±0.25
150
150
V
DD
- 1.30
ppm
V
dB
±20
±20
µV
pA
pA
GΩ
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain Error
-20mV ≤ V
DIFF
≤ +20mV
MAX4208, G = 100V/V
-20mV ≤ V
DIFF
≤ +20mV
MAX4209H, G = 100V/V
MAX4208, G = 100V/V
MAX4209H, G = 100V/V
V
CM
CMRR
Guaranteed by CMRR test
V
CM
= (V
SS
- 0.1V) to (V
DD
- 1.30V)
Gain Nonlinearity
(Note 2)
Input Common-Mode Range
Input Common-Mode Rejection
Ratio
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Maxim Integrated
│
2
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Electrical Characteristics (continued)
(V
DD
= 5V, V
SS
= 0V, V
CM
= V
REF
= V
DD
/2, V
REFIN/MODE
= V
SS
, R
L
= 100kΩ to V
DD
/2, V
DIFF
= (V
IN+
- V
IN-
) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ),
T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Power-Supply Rejection Ratio
SYMBOL
PSRR
CONDITIONS
V
DD
= 2.85V to 5.5V, V
REF
= V
CM
=
(V
SS
+ 0.5V)
MIN
100
TYP
125
MAX
UNITS
dB
REFIN/MODE AND REF DC CHARACTERISTICS
REFIN/MODE Buffer Input Offset
Voltage
REFIN/MODE Input Voltage Low
REFIN/MODE Input Voltage High
REFIN/MODE Buffered
Reference Input Range
REFIN/MODE Buffer
Common-Mode Rejection Ratio
REFIN/MODE Buffer
Power-Supply Rejection Ratio
REFIN/MODE Bias Current
REF Common-Mode Range
REF Common-Mode Rejection
Ratio
REF, FB Bias Current
REF Input Current (MAX4209)
OUTPUT DC CHARACTERISTICS
R
L
= 100kΩ
V
OH
Output Voltage Swing
(Notes 6 and 7)
V
OL
V
OUT
- V
SS
Source
Sink
V
DD
- V
OUT
R
L
= 10kΩ
R
L
= 1kΩ
R
L
= 100kΩ
R
L
= 10kΩ
R
L
= 1kΩ
Short-Circuit Current
Short-Circuit Recovery Time
AC CHARACTERISTICS
Gain-Bandwidth Product
Small-Signal Bandwidth
Slew Rate (Note 8)
GBW
BW
SR
MAX4208, G = 1V/V
MAX4209H, G =100V/V
MAX4208, G = 1V/V, V
OUT
= 100mV step
750
7.5
80
kHz
kHz
V/ms
I
SC
30
50
250
30
50
250
+20
-25
0.50
45
70
325
40
65
285
mA
ms
mV
I
REF
I
REFIN
V
IL
V
IH
V
REFIN/MODE
(Note 2)
Reference buffer is OFF
Shutdown mode
Reference buffer is ON, guaranteed by
REFIN/MODE CMRR test
(V
SS
+ 0.2V) ≤ V
REF/MODE
≤ (V
DD
- 1.3V)
(Note 2)
V
DD
= 2.85V to 5.5V, V
REF/MODE
= V
CM
= (V
SS
+ 0.5V)
V
SS
< V
REFIN/MODE
< V
DD
(Note 3)
Guaranteed by reference CMRR test
(Note 4)
V
SS
≤ V
REF
≤ (V
DD
- 1.30V)
(Note 4)
MAX4208 (Note 3)
V
DIFF
= 0V (Note 5)
V
DIFF
= ±100mV (Note 5)
V
SS
106
135
1
±10
±100
V
DD
-
0.2
V
SS
+
0.2
106
100
135
125
1
V
DD
-
1.30
±10
V
SS
V
DD
V
DD
-
1.3
±40
V
SS
+
0.05
µV
V
V
V
dB
dB
pA
V
dB
pA
nA
µA
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Maxim Integrated
│
3
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Electrical Characteristics (continued)
(V
DD
= 5V, V
SS
= 0V, V
CM
= V
REF
= V
DD
/2, V
REFIN/MODE
= V
SS
, R
L
= 100kΩ to V
DD
/2, V
DIFF
= (V
IN+
- V
IN-
) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ),
T
A
= +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
V
DD
Guaranteed by PSRR test
V
REFIN/MODE
= V
SS
,
buffer OFF
Supply Current
I
DD
(V
SS
+ 0.2V) ≤ V
REFIN/MODE
≤
(V
DD
- 1.3V), buffer ON
V
DD
= 5V
V
DD
= 5V
2.85
0.75
1.40
1.4
5.50
1.30
mA
2.30
5.0
µA
V
t
EN
, t
DIS
SYMBOL
t
S
C
L
e
n
CONDITIONS
To within 0.1% of final value
No sustained oscillations
f = 0.1Hz to 10Hz
f = 1kHz
To within 0.1% of final value
MAX4208,
G = 1V/V
MAX4209H
MIN
TYP
10
120
200
2.5
140
20
20
pF
µV
P-P
nV/√Hz
ms
ms
MAX
UNITS
µs
V
REFIN/MODE
= V
DD
, shutdown mode
Electrical Characteristics
(V
DD
= 5V, V
SS
= 0V, V
CM
= V
REF
= V
DD
/2, V
REFIN/MODE
= V
SS
, R
L
= 100kΩ to V
DD
/2, V
DIFF
= (V
IN+
- V
IN-
) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ),
T
A
= -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +85°C
T
A
= +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
0.1
0.1
0.01
0.01
10
20
0.30
0.35
0.30
0.35
%
MIN
TYP
MAX
±45
±60
±30
±40
±0.45
±0.45
±0.17
±0.17
pA
µV/°C
µV
UNITS
INPUT DC CHARACTERISTICS
MAX4208, G = 100V/V
Input Offset Voltage
V
OS
MAX4209H, G = 100V/V
MAX4208, G = 100V/V
TCV
OS
MAX4209H, G = 100V/V
-100mV ≤ V
DIFF
< +100mV
(Note 3)
MAX4208, G = 100V/V,
-20mV ≤ V
DIFF
≤ +20mV
MAX4209H, G = 100V/V,
-20mV ≤ V
DIFF
≤ +20mV
Input Offset Voltage
Temperature Drift
(Note 2)
Input Bias Current
Gain Error
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Maxim Integrated
│
4
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
Electrical Characteristics (continued)
(V
DD
= 5V, V
SS
= 0V, V
CM
= V
REF
= V
DD
/2, V
REFIN/MODE
= V
SS
, R
L
= 100kΩ to V
DD
/2, V
DIFF
= (V
IN+
- V
IN-
) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ),
T
A
= -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
-20mV ≤ V
DIFF
≤ +20mV
(MAX4208),
T
A
= -40°C to +125°C
G = 100V/V
-20mV ≤ V
DIFF
≤ +20mV
(MAX4209H),
T
A
= -40°C to +125°C
G = 100V/V
MAX4208,
G = 100V/V
MAX4209H,
G = 100V/V
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
V
SS
- 0.1
96
90
96
90
100
100
V
SS
+ 0.2
V
DD
- 1.6
V
SS
+ 0.05
MIN
TYP
50
MAX
180
ppm/°C
50
180
210
700
210
700
V
DD
- 1.6
V
dB
ppm
UNITS
Gain Error Temperature
Drift (Note 2)
Gain Nonlinearity
(Note 2)
Input Common-Mode
Range
Input Common-Mode
Rejection Ratio
Power-Supply Rejection
Ratio
G
NL
V
CM
CMRR
Guaranteed by CMRR test,
T
A
= -40°C to +125°C
(V
SS
- 0.1V) ≤ V
CM
≤
(V
DD
- 1.6V)
V
DD
= 2.85V to 5.5V,
V
REF
= V
CM
= V
SS
+
0.5V
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
Reference buffer is ON, guaranteed by REFIN/
MODE CMRR test
Reference buffer is OFF
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C to +85°C
T
A
= -40°C to +125°C
PSRR
dB
REFIN/MODE AND REF DC CHARACTERISTICS
REFIN/MODE Buffer Input
Offset Voltage
REFIN/MODE Buffered
Reference Input Range
REFIN/MODE Input
Voltage Low
V
REFIN/MODE
V
IL
µV
V
V
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Maxim Integrated
│
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