AD637JQ Analog Devices Inc, AD637JQ Datasheet

AD637JQ

Manufacturer Part Number

AD637JQ

Description

IC RMS/DC CONV PRECISION 14-CDIP

Manufacturer

Analog Devices Inc

Datasheets

1.AD637JRZ.pdf (20 pages)

2.AD637JQ.pdf (20 pages)

3.AD637JQ.pdf (15 pages)

Specifications of AD637JQ

Rohs Status

RoHS non-compliant

Current - Supply

2.2mA

Voltage - Supply

±3.0V ~ 18V

Mounting Type

Through Hole

Package / Case

14-CDIP (0.300", 7.62mm)

Accuracy %

0.25%

Bandwidth

200kHz

Supply Current

2.2mA

Power Dissipation Pd

108mW

Supply Voltage Range

Â± 3V To Â± 18V

Digital Ic Case Style

DIP

No. Of Pins

Input Type

RMS

Module Type

Converter

Output Type

Voltage, Supply

± 18 VDC

For Use With

AD637-EVALZ - BOARD EVALUATION FOR AD637

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

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Price

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Bonase Electronics (HK) Co., Limited

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BOSTOCK HK LIMITED

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20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AD637JQZ

Manufacturer:

Quantity:

6 221

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FEATURES

High accuracy

Wide bandwidth

Computes

dB output (60 dB range)

Chip select/power-down feature allows

14-lead SBDIP, 14-lead low cost CERDIP, and 16-lead SOIC_W

GENERAL DESCRIPTION

The AD637 is a complete high accuracy, monolithic rms-to-dc

converter that computes the true rms value of any complex

waveform. It offers performance that is unprecedented in

integrated circuit rms-to-dc converters and comparable to

discrete and modular techniques in accuracy, bandwidth, and

dynamic range. A crest factor compensation scheme in the

AD637 permits measurements of signals with crest factors of up

to 10 with less than 1% additional error. The circuit’s wide

bandwidth permits the measurement of signals up to 600 kHz

with inputs of 200 mV rms and up to 8 MHz when the input

levels are above 1 V rms.

As with previous monolithic rms converters from ADI, the

AD637 has an auxiliary dB output available to the user. The

logarithm of the rms output signal is brought out to a separate

pin, allowing direct dB measurement with a useful range of 60

dB. An externally programmed reference current allows the

user to select the 0 dB reference voltage to correspond to any

level between 0.1 V and 2.0 V rms.

A chip select connection on the AD637 permits the user to

decrease the supply current from 2.2 mA to 350 µA during periods

when the rms function is not in use. This feature facilitates the

addition of precision rms measurement to remote or hand-held

applications where minimum power consumption is critical. In

addition, when the AD637 is powered down, the output goes to a

high impedance state. This allows several AD637s to be tied

together to form a wideband true rms multiplexer.

Rev. G

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.

0.02% max nonlinearity, 0 V to 2 V rms input

0.10% additional error to crest factor of 3

8 MHz at 2 V rms input

600 kHz at 100 mV rms

True rms

Square

Mean square

Absolute value

Analog three-state operation

Quiescent current reduction from 2.2 mA to 350 µA

DENOMINATOR

The input circuitry of the AD637 is protected from overload

voltages that are in excess of the supply levels. The inputs are

not damaged by input signals if the supply voltages are lost.

The AD637 is available in Accuracy Grades J and K for

commercial temperature range (0°C to 70°C) applications;

Accuracy Grades A and B for industrial range (−40°C to +85°C)

applications; and Accuracy Grade S rated over the −55°C to

+125°C temperature range. All versions are available in

hermetically sealed, 14-lead SBDIP, 14-lead CERDIP, and

16-lead SOIC packages.

The AD637 computes the true root-mean-square, mean-square,

or absolute value of any complex ac (or ac plus dc) input

waveform and gives an equivalent dc output voltage. The true

rms value of a waveform is more useful than an average

rectified signal since it relates directly to the power of the signal.

The rms value of a statistical signal is also related to the

standard deviation of the signal.

The AD637 is laser wafer trimmed to achieve rated

performance without external trimming. The only external

component required is a capacitor that sets the averaging time

period. The value of this capacitor also determines low

frequency accuracy, ripple level, and settling time.

The on-chip buffer amplifier can be used either as an input

buffer or in an active filter configuration. The filter can be used

to reduce the amount of ac ripple, thereby increasing accuracy.

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

Tel: 781.329.4700

Fax: 781.461.3113

BUFFER

OUTPUT

OFFSET

COM

Figure 1. SBDIP (D-14) and CERDIP (Q-14) Packages

High Precision, Wideband

FUNCTIONAL BLOCK DIAGRAM

25kΩ

ABSOLUTE

VALUE

RMS-to-DC Converter

SQUARER/

DIVIDER

BIAS

25kΩ

www.analog.com

AD637

BUFFER

OUT

RMS OUT

Related parts for AD637JQ

AD637JQ Summary of contents

Page 1

FEATURES High accuracy 0.02% max nonlinearity rms input 0.10% additional error to crest factor of 3 Wide bandwidth 8 MHz rms input 600 kHz at 100 mV rms Computes True rms Square ...

Page 2

SPECIFICATIONS At 25°C, and ± unless otherwise noted. Table 1. AD637J/ AD637A Parameter Min Typ TRANSFER FUNCTION CONVERSION ACCURACY Total Error, 2 Internal Trim (Figure MIN MAX vs. Supply +300 ...

Page 3

AD637 AD637J/ AD637A Parameter Min Typ 5 FREQUENCY RESPONSE Bandwidth for 1% Additional Error (0.09 dB 200 200 IN ±3 dB Bandwidth ...

Page 4

AD637J/ AD637A Parameter Min Typ CHIP SELECT (CS) RMS ON Level Open or 2.4 V < V RMS OFF Level V < Chip Select OUT CS Low CS High On Time Constant 10 + ((25 ...

AD637 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter ESD Rating Supply Voltage Internal Quiescent Power Dissipation Output Short-Circuit Duration Storage Temperature Range Lead Temperature Range (Soldering 10 secs) Rated Operating Temperature Range AD637J, AD637K AD637A, AD637B AD637S, 5962-8963701CA ESD CAUTION ESD ...

Page 6

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 1 BUFF COMMON 3 AD637 OUTPUT OFFSET 4 TOP VIEW (Not to Scale DEN INPUT 6 dB OUTPUT CONNECT Figure 2. 14-Lead SBDIP/CERDIP Pin Configuration Table ...

Page 7

AD637 FUNCTIONAL DESCRIPTION 14 BUFF OUT 1 BUFF IN A5 24k Ω ABSOLUTE VALUE VOLTAGE – CURRENT CONVERTER 6k Ω 12k Ω The AD637 embodies an implicit solution of the rms equation that overcomes the inherent ...

Page 8

STANDARD CONNECTION The AD637 is simple to connect for a majority of rms measurements. In the standard rms connection shown in Figure 5, only a single external capacitor is required to set the averaging time constant. In this configuration, the ...

Page 9

AD637 Table 5. Practical Values of C and C2 for Various Input Waveforms AV Absolute Value Input Waveform Circuit Waveform and Period and Period T 1/ Symmetrical Sine Wave Sine Wave with dc Offset ...

Page 10

T η = DUTY CYCLE = η (RMS RMS IN µ 100 0.1 0. PULSE WIDTH ( µ s) Figure 16. AD637 Error vs. ...

Page 11

AD637 SIGNAL INPUT BUF COM 3 BIAS OUT SECTION 4 OFF 4.7kΩ DEN 25k Ω 10k Ω 500k Ω +2.5 VOLTS 0dB ADJUST NOTE: VALUES CHOSEN ...

Page 12

CALIBRATION Refer to Figure 19: • Set VIN = 1. 1.00 V rms • Adjust R1 for 0 dB out = 0.00 V • Set VIN = 0 0.10 V rms • Adjust ...

Page 13

AD637 BUF COM OUT OFF 4.7kΩ 6 DEN BUF COM 3 OUT OFF 4.7kΩ DEN ...

Page 14

OUTLINE DIMENSIONS 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) CONTROLLING DIMENSIONS ...

Page 15

... AD637AQ −40°C to +85°C AD637AR −40°C to +85°C AD637BQ −40°C to +85°C AD637BR −40°C to +85°C AD637JD 0°C to 70°C AD637JQ 0°C to 70°C AD637JR 0°C to 70°C AD637JR-REEL 0°C to 70°C AD637JR-REEL7 0°C to 70°C 2 AD637JRZ 0° ...

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