Datasheet

REV. A
–2–
AD820–SPECIFICATIONS
(V
S
= O, 5 volts (@ T
A
= +258C, V
CM
= 0 V, V
OUT
= 0.2 V unless otherwise noted)
AD820A AD820B
Parameter Conditions Min Typ Max Min Typ Max Units
DC PERFORMANCE
Initial Offset 0.1 0.8 0.1 0.4 mV
Max Offset over Temperature 0.5 1.2 0.5 0.9 mV
Offset Drift 2 2 µV/°C
Input Bias Current V
O
= 0 V to 4 V 2 25 2 10 pA
at T
MAX
0.5 5 0.5 2.5 nA
Input Offset Current 2 20 2 10 pA
at T
MAX
0.5 0.5 nA
Open-Loop Gain V
O
= 0.2 V to 4 V
R
L
= 100k 400 1000 500 1000 V/mV
T
MIN
to T
MAX
400 400 V/mV
R
L
= 10k 80 150 80 150 V/mV
T
MIN
to T
MAX
80 80 V/mV
R
L
= 1k 15 30 15 30 V/mV
T
MIN
to T
MAX
10 10 V/mV
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
0.1 Hz to 10 Hz 2 2 µV p-p
f = 10 Hz 25 25 nV/√
Hz
f = 100 Hz 21 21 nV/√
Hz
f = 1 kHz 16 16 nV/√Hz
f = 10 kHz 13 13 nV/√
Hz
Input Current Noise
0.1 Hz to 10 Hz 18 18 fA p-p
f = 1 kHz 0.8 0.8 fA/√
Hz
Harmonic Distortion R
L
= 10k to 2.5 V
f = 10 kHz V
O
= 0.25 V to 4.75 V –93 –93 dB
DYNAMIC PERFORMANCE
Unity Gain Frequency 1.8 1.8 MHz
Full Power Response V
O
p-p = 4.5 V 210 210 kHz
Slew Rate 3 3 V/µs
Settling Time
to 0.1% V
O
= 0.2 V to 4.5 V 1.4 1.4 µs
to 0.01% 1.8 1.8 µs
INPUT CHARACTERISTICS
Common-Mode Voltage Range
1
–0.2 4 –0.2 4 V
T
MIN
to T
MAX
–0.2 4 –0.2 4 V
CMRR V
CM
= 0 V to +2 V 66 80 72 80 dB
T
MIN
to T
MAX
66 66 dB
Input Impedance
Differential 10
13
i0.5 10
13
i0.5 ΩipF
Common Mode 10
13
i2.8 10
13
i2.8 ΩipF
OUTPUT CHARACTERISTICS
Output Saturation Voltage
2
V
OL
–V
EE
I
SINK
= 20 µA 5 7 57mV
T
MIN
to T
MAX
10 10 mV
V
CC
–V
OH
I
SOURCE
= 20 µA 10 14 1014mV
T
MIN
to T
MAX
20 20 mV
V
OL
–V
EE
I
SINK
= 2 mA 40 55 40 55 mV
T
MIN
to T
MAX
80 80 mV
V
CC
–V
OH
I
SOURCE
= 2 mA 80 110 80 110 mV
T
MIN
to T
MAX
160 160 mV
V
OL
–V
EE
I
SINK
= 15 mA 300 500 300 500 mV
T
MIN
to T
MAX
1000 1000 mV
V
CC
–V
OH
I
SOURCE
= 15 mA 800 1500 800 1500 mV
T
MIN
to T
MAX
1900 1900 mV
Operating Output Current 15 15 mA
T
MIN
to T
MAX
12 12 mA
Short Circuit Current 25 25 mA
Capacitive Load Drive 350 350 pF
POWER SUPPLY
Quiescent Current T
MIN
to T
MAX
620 800 620 800 µA
Power Supply Rejection V
S
+ = 5 V to 15 V 70 80 66 80 dB
T
MIN
to T
MAX
70 66 dB