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AD637
AD637J/AD637A
AD637K/AD637B
AD637S
Parameter
Min
Typ Max
Min
Typ Max
Min
Typ
Max
Unit
OUTPUT CHARACTERISTICS
Offset Voltage
±1
±0.5
±1
mV
vs. Temperature
±0.05
±0.089
±0.04
±0.056
±0.04
±0.07
mV/°C
Voltage Swing,
0 to 12.0
13.5
0 to 12.0
13.5
0 to 12.0
13.5
V
±15 V Supply, 2 kΩ Load
Voltage Swing,
0 to 2
2.2
0 to 2
2.2
0 to 2
2.2
V
±3 V Supply, 2 kΩ Load
Output Current
Short-Circuit Current
Resistance
6
20
0.5
6
20
0.5
6
20
0.5
mA
mA
Ω
Chip Select High
Resistance
100
100
100
kΩ
Chip Select Low
dB OUTPUT
Error, V IN 7 mV to 7 V rms,
±0.5
±0.3
±0.5
dB
0 dB = 1 V rms
Scale Factor
Scale Factor Temperature
?3
+0.33
?3
+0.33
?3
+0.33
mV/dB
% of
Coefficient
reading/°C
?0.033
?0.033
?0.033
dB/°C
I REF for 0 dB = 1 V rms
5
20
80
5
20
80
5
20
80
μA
I REF Range
1
100
1
100
1
100
μA
BUFFER AMPLIFIER
Input Output
?V S to (+V S ? 2.5 V)
?V S to (+V S ? 2.5 V)
?V S to (+V S ? 2.5 V)
V
Voltage Range
Input Offset Voltage
Input Current
±0.8
±2
±2
±10
±0.5
±2
±1
±5
±0.8
±2
± 2
± 10
mV
nA
Input Resistance
10 8
10 8
10 8
Ω
Output Current
?0.13
+5
?0.13
+5
?0.13
+5
mA
Short-Circuit Current
Small Signal Bandwidth
Slew Rate 6
20
1
5
20
1
5
20
1
5
mA
MHz
V/μs
DENOMINATOR INPUT
Input Range
0 to 10
0 to 10
0 to 10
V
Input Resistance
20
25
30
20
25
30
20
25
30
kΩ
Offset Voltage
±0.2
±0.5
±0.2
±0.5
±0.2
±0.5
mV
CHIP SELECT (CS)
RMS On Level
Open or 2.4 V < V C < +V S
Open or 2.4 V < V C < +V S
Open or 2.4 V < V C < +V S
RMS Off Level
V C < 0.2 V
V C < 0.2 V
V C < 0.2 V
I OUT of Chip Select
CS Low
CS High
On Time Constant
Off Time Constant
10
0
10 + ((25 kΩ) × C AV )
10 + ((25 kΩ) × C AV )
10
0
10 + ((25 kΩ) × C AV )
10 + ((25 kΩ) × C AV )
10
0
10 + ((25 kΩ) × C AV )
10 + ((25 kΩ) × C AV )
μA
μA
μs
μs
POWER SUPPLY
Operating Voltage Range
Quiescent Current
Standby Current
±3.0
2.2
350
±18
3
450
±3.0
2.2
350
±18
3
450
±3.0
2.2
350
±18
3
450
V
mA
μA
1
2
3
4
5
6
Specifications shown in bold are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels.
All minimum and maximum specifications are guaranteed, although only those shown in boldface are tested on all production units.
Accuracy specified 0 V rms to 7 V rms dc with AD637 connected, as shown in Figure 5 .
Nonlinearity is defined as the maximum deviation from the straight line connecting the readings at 10 mV and 2 V.
Error vs. crest factor is specified as additional error for 1 V rms.
Input voltages are expressed in volts rms. Percent is in % of reading.
With external 2 kΩ pull-down resistor tied to ?V S .
Rev. K | Page 4 of 20
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