AD637.pdf part of Keithley AD637 AD637.pdf, Keithley 2001 ds AD637.pdf text manual preview

Text preview for : AD637.pdf part of Keithley AD637 Keithley 2001 ds AD637.pdf

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High Precision, Wideband
RMS-to-DC Converter
AD637
FEATURES FUNCTIONAL BLOCK DIAGRAM
High accuracy
0.02% maximum nonlinearity, 0 V to 2 V rms input BUFF IN
BUFF
0.10% additional error to crest factor of 3 OUT
Wide bandwidth
25k
8 MHz at 2 V rms input RMS OUT
VIN ABSOLUTE SQUARER/
600 kHz at 100 mV rms VALUE DIVIDER

Computes
True rms
25k CAV
Square DEN INPUT
Mean square dB OUTPUT

Absolute value
OUTPUT
dB output (60 dB range) OFFSET
BIAS
Chip select/power-down feature allows COMMON
Analog three-state operation

00788-001
AD637
CS
Quiescent current reduction from 2.2 mA to 350 A
14-lead SBDIP, 14-lead low cost CERDIP, and 16-lead SOIC_W Figure 1.

GENERAL DESCRIPTION
The AD637 is a complete, high accuracy, monolithic rms-to-dc The input circuitry of the AD637 is protected from overload
converter that computes the true rms value of any complex voltages in excess of the supply levels. The inputs are not
waveform. It offers performance that is unprecedented in damaged by input signals if the supply voltages are lost.
integrated circuit rms-to-dc converters and comparable to
discrete and modular techniques in accuracy, bandwidth, and The AD637 is available in accuracy Grade J and Grade K for
dynamic range. A crest factor compensation scheme in the commercial temperature range (0