AD637

Data Sheet

Rev. L | Page 4 of 25

SPECIFICATIONS

At 25°C, test frequency = 1 kHz, VIN units are VRMS, VS = ±15 V dc, unless otherwise noted.

Table 1.

Parameter

Test Conditions/Comments

AD637J/AD637A

Unit

Min

Typ

Max

TRANSFER FUNCTION

VOUT =

2

IN )

(V

avg 

CONVERSION ACCURACY

Total Error, Internal Trim

See Figure 5

±1 ± 0.5

mV rms ±% of reading

TMIN to TMAX

±3.0 ± 0.6

mV ± % of reading

vs. Supply

VIN = 300 mV

30

150

μV/V

VIN = −300 mV

100

300

μV/V

DC Reversal

−2 V < VIN < +2 V

0.25

% of reading

Nonlinearity

2 V full scale

0.04

% of FSR

7 V full scale

0.05

% of FSR

Total Error

External trim

±0.5 ± 0.1

mV ± % of reading

ERROR VS. CREST FACTOR (CF)

Additional, at 1 V rms

CF, %

For CF = 1 to 2

Specified accuracy

For CF = 3

±0.1

% of reading

For CF = 10

±1.0

% of reading

AVERAGING TIME CONSTANT

25

ms/μF CAV

INPUT CHARACTERISTICS

Signal Range

VS = ±15 V

Continuous

0 to 7

V rms

Transient

±15

V p-p

VS = ±5 V

Continuous

0 to 4

V rms

Transient

±6

V p-p

Input Resistance

6.4

8

9.6

kΩ

Input Offset Voltage

±0.5

mV

FREQUENCY RESPONSE

Bandwidth for 1% (0.09 dB) Additional Error

VIN = 20 mV

11

kHz

VIN = 200 mV

66

kHz

VIN = 2 V

200

kHz

±3 dB

VIN = 20 mV

150

kHz

VIN = 200 mV

1

MHz

VIN = 2 V

8

MHz

OUTPUT CHARACTERISTICS

Offset Voltage

±1

mV

vs. temperature

±0.05

±0.089

mV/°C

Voltage Swing, 2 kΩ load

0 to 12.0

13.5

V

VS = ±3 V

0 to 2

2.2

V

Output Current

6

mA

Short-Circuit Current

20

mA

Resistance

CS high

0.5

Ω

Resistance

CS low

100

kΩ