AD636J Analog Devices, AD636J Datasheet

AD636J

Manufacturer Part Number

AD636J

Description

Low Level/ True RMS-to-DC Converter

Manufacturer

Analog Devices

Datasheet

1.AD636J.pdf (8 pages)

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PRODUCT DESCRIPTION

The AD636 is a low power monolithic IC which performs true

rms-to-dc conversion on low level signals. It offers performance

which is comparable or superior to that of hybrid and modular

converters costing much more. The AD636 is specified for a

signal range of 0 mV to 200 mV rms. Crest factors up to 6 can

be accommodated with less than 0.5% additional error, allowing

accurate measurement of complex input waveforms.

The low power supply current requirement of the AD636, typi-

cally 800 A, allows it to be used in battery-powered portable

instruments. A wide range of power supplies can be used, from

and output terminals are fully protected; the input signal can

exceed the power supply with no damage to the device (allowing

the presence of input signals in the absence of supply voltage)

and the output buffer amplifier is short-circuit protected.

The AD636 includes an auxiliary dB output. This signal is

derived from an internal circuit point which represents the loga-

rithm of the rms output. The 0 dB reference level is set by an

externally supplied current and can be selected by the user

to correspond to any input level from 0 dBm (774.6 mV) to

–20 dBm (77.46 mV). Frequency response ranges from 1.2 MHz

at a 0 dBm level to over 10 kHz at –50 dBm.

The AD636 is designed for ease of use. The device is factory-

trimmed at the wafer level for input and output offset, positive

and negative waveform symmetry (dc reversal error), and full-

scale accuracy at 200 mV rms. Thus no external trims are re-

quired to achieve full-rated accuracy.

AD636 is available in two accuracy grades; the AD636J total

error of 0.5 mV 0.06% of reading, and the AD636K

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

2.5 V to 16.5 V or a single +5 V to +24 V supply. The input

FEATURES

True RMS-to-DC Conversion

200 mV Full Scale

Laser-Trimmed to High Accuracy

Wide Response Capability:

dB Output with 50 dB Range

Low Power: 800 A Quiescent Current

Single or Dual Supply Operation

Monolithic Integrated Circuit

Low Cost

Available in Chip Form

0.5% Max Error (AD636K)

1.0% Max Error (AD636J)

Computes RMS of AC and DC Signals

1 MHz –3 dB Bandwidth: V RMS >100 mV

Signal Crest Factor of 6 for 0.5% Error

BUF OUT

BUF IN

–V

is accurate within 0.2 mV to 0.3% of reading. Both versions

are specified for the 0 C to +70 C temperature range, and are

offered in either a hermetically sealed 14-pin DIP or a 10-lead

TO-100 metal can. Chips are also available.

PRODUCT HIGHLIGHTS

1. The AD636 computes the true root-mean-square of a com-

2. The 200 millivolt full-scale range of the AD636 is compatible

3. The only external component required to perform measure-

4. The on-chip buffer amplifier can be used to buffer either the

5. The AD636 will operate over a wide range of power supply

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

plex ac (or ac plus dc) input signal and gives an equivalent dc

output level. The true rms value of a waveform is a more

useful quantity than the average rectified value since it is a

measure of the power in the signal. The rms value of an

ac-coupled signal is also its standard deviation.

with many popular display-oriented analog-to-digital con-

verters. The low power supply current requirement permits

use in battery powered hand-held instruments.

ments to the fully specified accuracy is the averaging capaci-

tor. The value of this capacitor can be selected for the desired

trade-off of low frequency accuracy, ripple, and settling time.

input or the output. Used as an input buffer, it provides

accurate performance from standard 10 M input attenua-

tors. As an output buffer, it can supply up to 5 milliamps of

output current.

voltages, including single +5 V to +24 V or split 2.5 V to

hundred hours of continuous operation.

NC = NO CONNECT

16.5 V sources. A standard 9 V battery will provide several

AD636

BUF

–

ABSOLUTE

10k

SQUARER

CURRENT

DIVIDER

MIRROR

VALUE

FUNCTIONAL BLOCK DIAGRAM

True RMS-to-DC Converter

10k

PIN CONNECTIONS &

World Wide Web Site: http://www.analog.com

COMMON

OUT

COMMON

AD636

10k

ABSOLUTE

SQUARER

CURRENT

Low Level,

MIRROR

DIVIDER

VALUE

–V

OUT

AD636

BUF

–

BUF IN

10k

BUF OUT

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AD636J Summary of contents

Page 1

... Thus no external trims are re- quired to achieve full-rated accuracy. AD636 is available in two accuracy grades; the AD636J total error of 0.5 mV 0.06% of reading, and the AD636K REV. B Information furnished by Analog Devices is believed to be accurate and reliable ...

Page 2

... Input Resistance Output Current Short Circuit Current Small Signal Bandwidth 5 Slew Rate POWER SUPPLY Voltage, Rated Performance Dual Supply Single Supply 6 Quiescent Current (@ +25 C, and + –V = –5 V, unless otherwise noted AD636J Min Typ Max Min 2 V avg OUT IN 0.5 1.0 0.1 0.01 0.1 0.01 0.2 0.3 0.3 Specified Accuracy Specified Accuracy – ...

Page 3

... Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 500 mW Maximum Input Voltage . . . . . . . . . . . . . . . . . . . . Storage Temperature Range – +150 C Operating Temperature Range AD636J +70 C Lead Temperature Range (Soldering 60 sec +300 C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...

Page 4

AD636 APPLYING THE AD636 The input and output signal ranges are a function of the supply voltages as detailed in the specifications. The AD636 can also be used in an unbuffered voltage output mode by disconnecting the input to the ...

Page 5

... Caution should be exercised in choosing the value of C dependent upon this value and is independent of the post filter. For a more detailed explanation of these topics refer to the RMS-to-DC Conversion Application Guide, 2nd Edition, available from Analog Devices. REV. B 100 – ...

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AD636J Analog Devices, AD636J Datasheet

AD636J

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AD636J Summary of contents

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