Datasheet

AD844
Rev. F | Page 3 of 20
SPECIFICATIONS
T
A
= 25°C and V
S
= ±15 V dc, unless otherwise noted.
Table 1.
AD844J/AD844A AD844B AD844S
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Unit
INPUT OFFSET VOLTAGE
1
50 300 50 150 50 300 V
T
MIN
to T
MAX
75 500 75 200 125 500 V
vs. Temperature 1 1 5 1 5 V/°C
vs. Supply 5 V to 18 V
Initial 4 20 4 10 4 20 V/V
T
MIN
to T
MAX
4 4 10 4 20 V/V
vs. Common Mode V
CM
= ±10 V
Initial 10 35 10 20 10 35 V/V
T
MIN
to T
MAX
10 10 20 10 35 V/V
INPUT BIAS CURRENT
Negative Input Bias Current
1
200 450 150 250 200 450 nA
T
MIN
to T
MAX
800 1500 750 1100 1900 2500 nA
vs. Temperature 9 9 15 20 30 nA/°C
vs. Supply 5 V to 18 V
Initial 175 250 175 200 175 250 nA/V
T
MIN
to T
MAX
220 220 240 220 300 nA/V
vs. Common Mode V
CM
= ±10 V
Initial 90 160 90 110 90 160 nA/V
T
MIN
to T
MAX
110 110 150 120 200 nA/V
Positive Input Bias Current
1
150 400 100 200 100 400 nA
T
MIN
to T
MAX
350 700 300 500 800 1300 nA
vs. Temperature 3 3 7 7 15 nA/°C
vs. Supply 5 V to 18 V
Initial 80 150 80 100 80 150 nA/V
T
MIN
to T
MAX
100 100 120 120 200 nA/V
vs. Common Mode V
CM
= ±10 V
Initial 90 150 90 120 90 150 nA/V
T
MIN
to T
MAX
130 130 190 140 200 nA/V
INPUT CHARACTERISTICS
Input Resistance
Negative Input 50 65 50 65 50 65 Ω
Positive Input 7 10 7 10 7 10 MΩ
Input Capacitance
Negative Input 2 2 2 pF
Positive Input 2 2 2 pF
Input Common-Mode Voltage
Range
±10 ±10 ±10 V
INPUT VOLTAGE NOISE f ≥ 1 kHz 2 2 2 nV/√Hz
INPUT CURRENT NOISE
Negative Input f ≥ 1 kHz 10 10 10 pV/√Hz
Positive Input f ≥ 1 kHz 12 12 12 pV/√Hz
OPEN-LOOP TRANSRESISTANCE V
OUT
= ±10 V
R
L
= 500 Ω 2.2 3.0 2.8 3.0 2.2 3.0 MΩ
T
MIN
to T
MAX
1.3 2.0 1.6 2.0 1.3 1.6 MΩ
Transcapacitance 4.5 4.5 4.5 pF
DIFFERENTIAL GAIN ERROR
2
f = 4.4 MHz 0.03 0.03 0.03 %
DIFFERENTIAL PHASE ERROR
2
f = 4.4 MHz 0.16 0.16 0.16 Degree