Datasheet

(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.)
PIN NAME FUNCTION
1 REFIN/MODE
Reference/Shutdown Mode Input. Trimode function is as follows:
Connect to V
DD
to put the device in shutdown mode.
Connect to an external reference (between V
SS
+ 0.2V and V
DD
- 1.3V) to buffer the voltage at
REFIN/MODE. Using the REF buffer allows the use of a simple resistor-divider or high-impedance
external reference to set the OUT level at 0mV IN with minimum error.
Connect to V
SS
to force the internal buffer output into a high-impedance state to allow external direct
drive of REF.
2 IN- Negative Differential Input
3 IN+ Positive Differential Input
4 V
SS
Negative Supply Input. Bypass V
SS
to ground with a 0.1µF capacitor or connect to ground for
single-supply operation.
5 REF
Output Reference Level. REF sets the OUT voltage for zero differential input. The internal buffer
sets the voltage at REF when the voltage at REFIN/MODE is between V
SS
+ 0.2V and V
DD
- 1.3V.
6 FB
Feedback Input. Connect FB to the center tap of an external resistive divider from OUT to REF to
set the gain for the MAX4208. MAX4209 FB is internally connected to gain-setting resistors. Connect
an optional capacitor, C
FB
, from OUT to FB to reduce autozero noise.
7 OUT Amplier Output
8 V
DD
Positive Supply Input. Bypass V
DD
to ground with a 0.1µF capacitor.
0.1% SETTLING TIME
vs. GAIN
MAX4208/9 toc21
GAIN (V/V)
SETTLING TIME (µs)
10 100
100
1000
10,000
10
1 1000
SETTLING TIME
vs. ACCURACY
MAX4208/9 toc22
ACCURACY (%)
SETTLING TIME (µs)
0.10
20
40
60
80
100
120
140
160
180
0
0.01 1.00
G = 100
MAX4208/MAX4209 Ultra-Low Offset/Drift, Precision
Instrumentation Ampliers with REF Buffer
Maxim Integrated │ 10
www.maximintegrated.com
Typical Operating Characteristics (continued)
Pin Description