AD636K datasheet, PDF - EEWORLD Datasheet

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AD636K: DescriptionRMS TO DC CONVERTER, 0.1 MHz, MBCY10; Categorysemiconductor logic; File Size462KB，16 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD636K Overview

RMS TO DC CONVERTER, 0.1 MHz, MBCY10

AD636K Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	10
Maximum operating temperature	70 Cel
Minimum operating temperature	0.0 Cel
Rated supply voltage	3 V
Maximum total error	1 %
Maximum operating frequency	0.1000 MHz
Maximum supply/operating voltage	16.5 V
Minimum supply/operating voltage	2 V
Maximum negative supply voltage	-16.5 V
Processing package description	MO-006AF, Metal CAN, TO-100, 10 PIN
state	EOL/LIFEBUY
packaging shape	round
Package Size	cylindrical
Terminal form	Wire
terminal coating	tin lead
Terminal location	BOTTOM
Packaging Materials	Metal
Temperature level	COMMERCIAL
Rated negative supply voltage	-5 V
Type of converter	RMS to DC converter
Maximum positive input voltage	0.2000 V
Minimum maximum negative supply voltage	-2.5 V

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Data Sheet

FEATURES

True rms-to-dc conversion

200 mV full scale

Laser-trimmed to high accuracy

0.5% maximum error (AD636K)

1.0% maximum error (AD636J)

Wide response capability

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

dB output with 50 dB range

Low power: 800 μA quiescent current

Single or dual supply operation

Monolithic integrated circuit

Low cost

Low Level, True RMS-to-DC Converter

AD636

FUNCTIONAL BLOCK DIAGRAM

ABSOLUTE

VALUE

COM

SQUARER

DIVIDER

CURRENT

MIRROR

10kΩ

BUFFER IN

BUF

10kΩ

OUT

BUFFER OUT

40kΩ

AD636

GENERAL DESCRIPTION

The AD636 is a low power monolithic IC that performs true

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

that 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,

typically 800 μA, is ideal for battery-powered portable

instruments. It operates from a wide range of dual and single

power supplies, from ±2.5 V to ±16.5 V or from +5 V to +24 V.

The input 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 derived from an

internal circuit point that represents the logarithm of the rms

output. The 0 dB reference level is set by an externally supplied

current and can be selected 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 0 dBm to greater than 10 kHz at −50 dBm.

The AD636 is easy to 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. Therefore, no external trims are required to

achieve full-rated accuracy.

Rev. E

Document Feedback

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 that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

–V

Figure 1.

The AD636 is available in two accuracy grades. The total error of the

J-version is typically less than ±0.5 mV ± 1.0% of reading, while

the total error of the AD636K is less than ±0.2 mV to ±0.5% of

reading. Both versions are temperature rated for operation

between 0°C and 70°C and available in 14-lead SBDIP and 10-lead

TO-100 metal can.

The AD636 computes the true root-mean-square of a complex 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 because it is a measure of the power

in the signal. The rms value of an ac-coupled signal is also its

standard deviation.

The 200 mV full-scale range of the AD636 is compatible with

many popular display-oriented ADCs. The low power supply

current requirement permits use in battery-powered hand-held

instruments. An averaging capacitor is the only external

component required to perform measurements to the fully

specified accuracy is. Its value optimizes the trade-off between

low frequency accuracy, ripple, and settling time.

An optional on-chip amplifier acts as a buffer for the input or the

output signals. Used in the input, it provides accurate

performance from standard 10 MΩ input attenuators. As an

output buffer, it sources up to 5 mA.

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

Tel: 781.329.4700

Technical Support

www.analog.com

00787-001

–V

AD636

TABLE OF CONTENTS

Features .............................................................................................. 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings ............................................................ 5

ESD Caution .................................................................................. 5

Pin Configurations and Function Descriptions ........................... 6

Typical Performance Characteristics ............................................. 7

Theory of Operation ........................................................................ 8

RMS Measurements ..................................................................... 8

The AD636 Buffer Amplifier ...................................................... 8

Frequency Response ..................................................................... 9

AC Measurement Accuracy and Crest Factor (CF) ................. 9

Data Sheet

Applications..................................................................................... 10

Standard Connection ................................................................. 10

Optional Trims for High Accuracy .......................................... 10

Single-Supply Connection ........................................................ 10

Choosing the Averaging Time Constant ................................. 11

A Complete AC Digital Voltmeter ........................................... 12

A Low Power, High Input, Impedance dB Meter....................... 12

Circuit Description ................................................................ 12

Performance Data .................................................................. 12

Frequency Response ±3 dBm ............................................... 13

Calibration .............................................................................. 13

Outline Dimensions ....................................................................... 14

Ordering Guide .......................................................................... 14

REVISION HISTORY

5/13—Rev. D to Rev. E

Reorganized Layout ............................................................ Universal

Changes to Figure 1 ........................................................................... 1

Change to Table 1 .............................................................................. 4

Added Typical Performance Characteristics Section ................... 7

Added Theory of Operation Section; Changes to Figure 7 and

Figure 8 ............................................................................................... 8

Changed Applying the AD636 Section to Applications Section;

Changes to Figure 9, Figure 10, and Single-Supply Connection

Section ...............................................................................................10

Changes to Figure 11 .......................................................................11

Changes to Figure 13 and A Complete AC Digital Voltmeter

Section ...............................................................................................12

Changes to Figure 17 and Figure 18..............................................13

Changes to Ordering Guide ...........................................................14

11/06—Rev. C to Rev. D

Changes to General Description ..................................................... 1

Changes to Table 1............................................................................. 3

Changes to Ordering Guide .......................................................... 13

1/06—Rev B to Rev. C

Updated Format .................................................................. Universal

Changes to Figure 1 and General Description ..............................1

Deleted Metallization Photograph ..................................................3

Added Pin Configuration and Function Description Section ....6

Updated Outline Dimensions ....................................................... 14

Changes to Ordering Guide .......................................................... 14

8/99—Rev A to Rev. B

Rev. E | Page 2 of 16

AD636K Related Products

	AD636K	AD636J	AD636	AD636JD
Description	RMS TO DC CONVERTER, 0.1 MHz, MBCY10	RMS TO DC CONVERTER, 0.1 MHz, MBCY10	RMS TO DC CONVERTER, 0.1 MHz, MBCY10	RMS TO DC CONVERTER, 0.1 MHz, CDIP14
Number of functions	1	1	1	1
Number of terminals	10	10	10	14
Maximum operating temperature	70 Cel	70 Cel	70 Cel	70 Cel
Minimum operating temperature	0.0 Cel	0.0 Cel	0.0 Cel	0.0 Cel
Rated supply voltage	3 V	3 V	3 V	3 V
Maximum total error	1 %	1 %	1 %	1 %
Maximum operating frequency	0.1000 MHz	0.1000 MHz	0.1000 MHz	0.1000 MHz
Maximum supply/operating voltage	16.5 V	16.5 V	16.5 V	16.5 V
Minimum supply/operating voltage	2 V	2 V	2 V	2 V
Maximum negative supply voltage	-16.5 V	-16.5 V	-16.5 V	-16.5 V
Processing package description	MO-006AF, Metal CAN, TO-100, 10 PIN	MO-006AF, Metal CAN, TO-100, 10 PIN	MO-006AF, Metal CAN, TO-100, 10 PIN	SIDE BRAZED, CERAMIC, TO-116, DIP-14
state	EOL/LIFEBUY	EOL/LIFEBUY	EOL/LIFEBUY	ACTIVE
packaging shape	round	round	round	RECTANGULAR
Package Size	cylindrical	cylindrical	cylindrical	IN-LINE
Terminal form	Wire	Wire	Wire	THROUGH-HOLE
terminal coating	tin lead	tin lead	tin lead	NOT SPECIFIED
Terminal location	BOTTOM	BOTTOM	BOTTOM	DUAL
Packaging Materials	Metal	Metal	Metal	CERAMIC, METAL-SEALED COFIRED
Temperature level	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Rated negative supply voltage	-5 V	-5 V	-5 V	-5 V
Type of converter	RMS to DC converter	RMS to DC converter	RMS to DC converter	RMS TO DC CONVERTER
Maximum positive input voltage	0.2000 V	0.2000 V	0.2000 V	0.2000 V
Minimum maximum negative supply voltage	-2.5 V	-2.5 V	-2.5 V	-2.5 V

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