AD628
Rev. G | Page 5 of 20
T
A
= 25°C, V
S
= 5 V, R
L
= 2 kΩ, R
EXT1
= 10 kΩ, R
EXT2
= ∞, V
REF
= 2.5 V, unless otherwise noted.
Table 2.
AD628AR AD628ARM
Parameter Conditions Min Typ Max Min Typ Max Unit
DIFFERENTIAL AND OUTPUT AMPLIFIER
Gain Equation G = +0.1(1+ R
EXT1
/R
EXT2
) V/V
Gain Range See Figure 29 0.1
1
100 0.1
1
100 V/V
Offset Voltage
V
CM
= 2.25 V; RTI of input pins
2
;
output amplifier G = +1
−3.0 +3.0 −3.0 +3.0 mV
vs. Temperature 6 15 6 15 μV/°C
CMRR
3
RTI of input pins; G = +0.1 to +100 75 75 dB
500 Hz 75 75 dB
Minimum CMRR Over Temperature −40°C to +85°C 70 70 dB
vs. Temperature 1 4 1 4 (μV/V)/°C
PSRR (RTI) V
S
= 4.5 V to 10 V 77 94 77 94 dB
Input Voltage Range
Common Mode
4
−12 +17 −12 +17 V
Differential −15 +15 −15 +15 V
Dynamic Response
Small Signal Bandwidth – 3 dB G = +0.1 440 440 kHz
Full Power Bandwidth 30 30 kHz
Settling Time G = +0.1; to 0.01%, 30 V step 15 15 μs
Slew Rate 0.3 0.3 V/μs
Noise (RTI)
Spectral Density 1 kHz 350 350 nV/√Hz
0.1 Hz to 10 Hz 15 15 μV p-p
DIFFERENTIAL AMPLIFIER
Gain 0.1 0.1 V/V
Error –0.1 +0.01 +0.1 –0.1 +0.01 +0.1 %
Nonlinearity 3 3 ppm
vs. Temperature 3 10 3 10 ppm
Offset Voltage RTI of input pins −2.5 +2.5 −2.5 +2.5 mV
vs. Temperature 10 10 μV/°C
Input Impedance
Differential 220 220 kΩ
Common Mode 55 55 kΩ
CMRR
5
RTI of input pins; G = +0.1 to +100 75 75 dB
500 Hz 75 75 dB
Minimum CMRR Over Temperature −40°C to +85°C 70 70 dB
vs. Temperature 1 4 1 4 (μV/V)/°C
Output Resistance 10 10 kΩ
Error −0.1 +0.1 −0.1 +0.1 %
OUTPUT AMPLIFIER
Gain Equation G = (1 + R
EXT1
/R
EXT2
) V/V
Nonlinearity G = +1, V
OUT
= 1 V to 4 V 0.5 0.5 ppm
Output Offset Voltage RTI of output amplifier −0.15 +0.15 −0.15 +0.15 mV
vs. Temperature 0.6 0.6 μV/°C
Output Voltage Swing R
L
= 10 kΩ 0.9 4.1 0.9 4.1 V
R
L
= 2 kΩ 1 4 1 4 V
Bias Current 1.5 3 1.5 3 nA
Offset Current 0.2 0.5 0.2 0.5 nA
CMRR V
CM
= 1 V to 4 V 130 130 dB
Open-Loop Gain V
OUT
= 1 V to 4 V 130 130 dB
