Datasheet

Data Sheet AD8420
Rev. 0 | Page 3 of 28
SPECIFICATIONS
+V
S
= +5 V, −V
S
= 0 V, V
REF
= 0 V, V
+IN
= 0 V, V
−IN
= 0 V, T
A
= 25°C, G = 1 to 1000, R
L
= 20 k, specifications referred to input, unless
otherwise noted. All Table 2 limits are valid from V
S
= 3 V to V
S
= ±5 V, unless otherwise specified.
Table 2.
Parameter Test Conditions/Comments Min Typ Max Unit
COMMON-MODE REJECTION RATIO (CMRR) V
CM
= 0 V to 2.7 V
CMRR DC to 60 Hz 100 dB
CMRR at 1 kHz 100 dB
NOISE
Voltage Noise
Spectral Density f = 1 kHz, V
DIFF
≤ 100 mV 55 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 80 fA/√Hz
Peak to Peak f = 0.1 Hz to 10 Hz 3 pA p-p
VOLTAGE OFFSET
Offset V
S
= 3 V to V
S
= 5 V 125 μV
V
S
= ±5 V 150 μV
Average Temperature Coefficient T
A
= −40°C to +85°C 1 μV/°C
Offset RTI vs. Supply (PSR) V
S
= 2.7 V to 5 V 86 dB
INPUTS
Valid for REF and FB pair, as well
as +IN and −IN
Input Bias Current
1
T
A
= +25°C 20 27 nA
T
A
= +85°C 24 nA
T
A
= −40°C 30 nA
Average Temperature Coefficient T
A
= −40°C to +85°C 30 pA/°C
Input Offset Current T
A
= +25°C 1 nA
T
A
= +85°C 1 nA
T
A
= −40°C 1 nA
Average Temperature Coefficient T
A
= −40°C to +85°C 0.5 pA/°C
Input Impedance
Differential 130||2 MΩ||pF
Common Mode 1000||2 MΩ||pF
Differential Input Operating Voltage T
A
= –40°C to +85°C −1 +1 V
Input Operating Voltage (+IN, −IN, REF, or FB) T
A
= +25°C −V
S
− 0.15 +V
S
− 2.2 V
T
A
= +85°C −V
S
− 0.05 +V
S
− 1.8 V
T
A
= –40°C −V
S
− 0.2 +V
S
− 2.7 V
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
G = 1 250 kHz
G = 10 25 kHz
G = 100 2.5 kHz
G =1000 0.25 kHz
Settling Time 0.01% V
S
= ±5 V
G = 1 −1 V to +1 V output step 3 μs
G = 10 −4.5 V to +4.5 V output step 130 μs
G = 100 −4.5 V to +4.5 V output step 1 ms
Slew Rate 1 V/μs