Datasheet

Data Sheet AD8237
Rev. 0 | Page 5 of 28
+V
S
= 1.8 V, −V
S
= 0 V, V
REF
= 0.9 V, V
CM
= 0.9 V, T
A
= 25°C, G = 1 to 1000, R
L
= 10 kΩ to ground, specifications referred to input, unless
otherwise noted.
Table 3.
Parameter Test Conditions/Comments Min Typ Max Unit
COMMON-MODE REJECTION RATIO (CMRR) V
CM
= 0.2 V to 1.6 V
CMRR at DC
G = 1, G = 10
100
120
dB
G = 100, G = 1000 114 140 dB
Over Temperature (G = 1) T
A
= −40°C to +125°C 94 dB
CMRR at 1 kHz 80 dB
NOISE
Voltage Noise
Spectral Density f = 1 kHz, V
DIFF
≤ 100 mV 68 nV/√Hz
Peak to Peak f = 0.1 Hz to 10 Hz, V
DIFF
≤ 100 mV 1.5 µV p-p
Current Noise
Spectral Density f = 1 kHz 70 fA/√Hz
Peak to Peak f = 0.1 Hz to 10 Hz 3 pA p-p
VOLTAGE OFFSET
Offset 25 75 µV
Average Temperature Coefficient T
A
= −40°C to +125°C 0.3 µV/°C
Offset RTI vs. Supply (PSR) 100 dB
INPUTS
1
Valid for REF and FB pair, as well as +IN and −IN
Input Bias Current T
A
= +25°C 250 650 pA
Over Temperature T
A
= −40°C to +125°C 1 nA
Average Temperature Coefficient
0.5
pA/°C
Input Offset Current T
A
= +25°C 250 650 pA
Over Temperature T
A
= −40°C to +125°C 1 nA
Average Temperature Coefficient 0.5 pA/°C
Input Impedance
Differential 100||5 MΩ||pF
Common Mode 800||10 MΩ||pF
Differential Input Operating Voltage T
A
= −40°C to +125°C ± 0.75 V
Input Operating Voltage (+IN, −IN, REF, or FB) T
A
= +25°C −V
S
− 0.3 +V
S
+ 0.3 V
T
A
= −40°C to +125°C −V
S
− 0.2 +V
S
+ 0.2 V
DYNAMIC RESPONSE
Small Signal Bandwidth −3 dB
Low Bandwidth Mode Pin 1 connected to −V
S
G = 1 200 kHz
G = 10
20
kHz
G = 100 2 kHz
G = 1000 0.2 kHz
High Bandwidth Mode Pin 1 connected to +V
S
G = 10 100 kHz
G = 100 10 kHz
G = 1000 1 kHz
Slew Rate
Low Bandwidth Mode 0.05 V/µs
High Bandwidth Mode 0.15 V/µs
EMI Filter Frequency 6 MHz