Datasheet

AD637
Rev. K | Page 4 of 20
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,
±15 V Supply, 2 kΩ Load
0 to 12.0
13.5
0 to 12.0
13.5
0 to 12.0
13.5 V
Voltage Swing,
±3 V Supply, 2 kΩ Load
0 to 2
2.2
0 to 2
2.2
0 to 2
2.2 V
Output Current
6 6 6
mA
Short-Circuit Current 20 20 20 mA
Resistance
Chip Select High
0.5 0.5 0.5 Ω
Resistance
Chip Select Low
100 100 100 kΩ
dB OUTPUT
Error, V
IN
7 mV to 7 V rms,
0 dB = 1 V rms
±0.5 ±0.3 ±0.5 dB
Scale Factor −3 −3 −3 mV/dB
Scale Factor Temperature
Coefficient
+0.33 +0.33 +0.33 % of
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
Voltage Range
−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
Input Offset Voltage ±0.8
±2
±0.5
±1
±0.8
±2
mV
Input Current ±2
±10
±2
±5
±2
±10
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 20 20 20 mA
Small Signal Bandwidth 1 1 1 MHz
Slew Rate
6
5 5 5 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 10 10 10 μA
CS High 0 0 0 μA
On Time Constant 10 + ((25 kΩ) × C
AV
) 10 + ((25 kΩ) × C
AV
) 10 + ((25 kΩ) × C
AV
) μs
Off Time Constant 10 + ((25 kΩ) × C
AV
) 10 + ((25 kΩ) × C
AV
) 10 + ((25 kΩ) × C
AV
) μs
POWER SUPPLY
Operating Voltage Range
±3.0 ±18 ±3.0 ±18 ±3.0 ±18
V
Quiescent Current 2.2
3
2.2
3
2.2
3
mA
Standby Current 350
450
350
450
350
450
μA
1
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.
2
Accuracy specified 0 V rms to 7 V rms dc with AD637 connected, as shown in . Figure 5
3
Nonlinearity is defined as the maximum deviation from the straight line connecting the readings at 10 mV and 2 V.
4
Error vs. crest factor is specified as additional error for 1 V rms.
5
Input voltages are expressed in volts rms. Percent is in % of reading.
6
With external 2 kΩ pull-down resistor tied to −V
S
.