AD536AKD Analog Devices Inc, AD536AKD Datasheet

AD536AKD

Manufacturer Part Number

AD536AKD

Description

IC TRUE RMS/DC CONV 14-CDIP

Manufacturer

Analog Devices Inc

Datasheet

1.AD536AJHZ.pdf (16 pages)

Specifications of AD536AKD

Rohs Status

RoHS non-compliant

Current - Supply

1.2mA

Voltage - Supply

5.0V ~ 36V, ±3.0V ~ 18V

Mounting Type

Through Hole

Package / Case

14-CDIP (0.300", 7.62mm)

Accuracy %

0.2%

Bandwidth

450kHz

Supply Current

1.2mA

Power Dissipation Pd

500mW

Supply Voltage Range

5V To 36V

Digital Ic Case Style

DIP

No. Of Pins

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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FEATURES

True rms-to-dc conversion

Laser trimmed to high accuracy

Wide response capability

dB output with 60 dB range

Low power: 1.2 mA quiescent current

Single- or dual-supply operation

Monolithic integrated circuit

−55°C to +125°C operation (AD536AS)

GENERAL DESCRIPTION

The AD536A is a complete monolithic integrated circuit that

performs true rms-to-dc conversion. It offers performance

comparable or superior to that of hybrid or modular units costing

much more. The AD536A directly computes the true rms value of

any complex input waveform containing ac and dc components.

A crest factor compensation scheme allows measurements with 1%

error at crest factors up to 7. The wide bandwidth of the device

extends the measurement capability to 300 kHz with less than 3 dB

errors for signal levels greater than 100 mV.

An important feature of the AD536A, not previously available

in rms converters, is an auxiliary dB output pin. The logarithm

of the rms output signal is brought out to a separate pin to allow

the dB conversion, with a useful dynamic range of 60 dB. Using

an externally supplied reference current, the 0 dB level can be

conveniently set to correspond to any input level from 0.1 V to

2 V rms.

The AD536A is laser trimmed to minimize input and output offset

voltage, to optimize positive and negative waveform symmetry

(dc reversal error), and to provide full-scale accuracy at 7 V rms.

As a result, no external trims are required to achieve the rated

unit accuracy.

The input and output pins are fully protected. The input circuitry

can take overload voltages well beyond the supply levels. Loss of

supply voltage with the input connected to external circuitry does

not cause the device to fail. The output is short-circuit protected.

Rev. D

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.

±0.2% maximum error (AD536AK)

±0.5% maximum error (AD536AJ)

Computes rms of ac and dc signals

450 kHz bandwidth: V rms > 100 mV

2 MHz bandwidth: V rms > 1 V

Signal crest factor of 7 for 1% error

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

Tel: 781.329.4700

Fax: 781.461.3113

The AD536A is available in two accuracy grades (J and K) for

commercial temperature range (0°C to 70°C) applications, and

one grade (S) rated for the −55°C to +125°C extended range.

The AD536AK offers a maximum total error of ±2 mV ± 0.2%

of reading, while the AD536AJ and AD536AS have maximum

errors of ±5 mV ± 0.5% of reading. All three versions are available

in a hermetically sealed 14-lead DIP or a 10-pin TO-100 metal

header package. The AD536AS is also available in a 20-terminal

leadless hermetically sealed ceramic chip carrier.

The AD536A computes the true root-mean-square level of a

complex ac (or ac plus dc) input signal and provides an equiva-

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

useful quantity than the average rectified value because it relates

directly to the power of the signal. The rms value of a statistical

signal also relates to its standard deviation.

An external capacitor is required to perform measurements to

the fully specified accuracy. The value of this capacitor deter-

mines the low frequency ac accuracy, ripple amplitude, and

settling time.

The AD536A operates equally well from split supplies or a

single supply with total supply levels from 5 V to 36 V. With

1 mA quiescent supply current, the device is well suited for a

wide variety of remote controllers and battery-powered

instruments.

True RMS-to-DC Converter

FUNCTIONAL BLOCK DIAGRAM

BUF IN

Integrated Circuit

Figure 1.

ABSOLUTE

SQUARER/

AD536A

CURRENT

DIVIDER

MIRROR

VALUE

BUF

25kΩ

AD536A

www.analog.com

BUF

OUT

Related parts for AD536AKD

AD536AKD Summary of contents

Page 1

FEATURES True rms-to-dc conversion Laser trimmed to high accuracy ±0.2% maximum error (AD536AK) ±0.5% maximum error (AD536AJ) Wide response capability Computes rms of ac and dc signals 450 kHz bandwidth: V rms > 100 mV 2 MHz bandwidth: V rms ...

Page 2

AD536A TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Applications ...

Page 3

SPECIFICATIONS T = +25°C and ±15 V dc, unless otherwise noted. A Table 1. AD536AJ Parameter Min Typ TRANSFER FUNCTION V OUT CONVERSION ACCURACY 1 Total Error, Internal Trim (See Figure 6) vs. Temperature T to +70°C MIN +70°C to ...

Page 4

AD536A AD536AJ Parameter Min Typ I TERMINAL OUT I Scale Factor 40 OUT I Scale Factor Tolerance ±10 OUT Output Resistance 20 25 Voltage Compliance −V (+V BUFFER AMPLIFIER Input and Output Voltage − Range (+V − 2.5V) ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Dual Supply Single Supply Internal Power Dissipation Maximum Input Voltage Buffer Maximum Input Voltage Maximum Input Voltage Storage Temperature Range Operating Temperature Range AD536AJ/AD536AK AD536AS Lead Temperature (Soldering, 60 sec) ESD Rating ...

Page 6

AD536A PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 3. D-14 and Q-14 Packages Pin Function Descriptions Pin No. Mnemonic − BUF OUT 7 BUF OUT ...

Page 7

Table 5. E-20 Package Pin Function Descriptions Pin No. Mnemonic − BUF OUT 10 BUF OUT ...

Page 8

AD536A APPLICATIONS INFORMATION TYPICAL CONNECTIONS The AD536A is simple to connect to for the majority of high accuracy rms measurements, requiring only an external capaci- tor to set the averaging time constant. The standard connection is shown in Figure 6 ...

Page 9

C AV SCALE FACTOR ADJUST V IN ABSOLUTE VALUE R1 AD536A 500Ω –V SQUARER/ S – DIVIDER CURRENT MIRROR BUF OUT V 6 ...

Page 10

AD536A The primary disadvantage in using a large C is that the settling time for a step change in input level is increased proportionately. Figure 12 illustrates that the relationship between C and 1% settling time is 115 ms for ...

Page 11

THEORY OF OPERATION The AD536A embodies an implicit solution of the rms equation that overcomes the dynamic range as well as other limitations inherent in a straightforward computation of rms. The actual computation performed by the AD536A follows the equation ...

Page 12

AD536A –V S – C1 0.1µF BUF OUT 6 dB OUT BUF IN 3mV/ SPECIAL TC COMPENSATION RESISTOR, +3300 ...

Page 13

OUT 5 0 ±6 ±10 VOLTS (DUAL SUPPLY) Figure 21. Input and Output Voltage Ranges vs. Dual Supply 2.5 0 ±16 ±18 Figure 22. Input and Output Voltage ...

Page 14

AD536A OUTLINE DIMENSIONS 0.358 (9.09) 0.342 (8.69) 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. 0.005 (0.13) MIN 0.080 (2.03) MAX 14 8 0.310 ...

Page 15

... REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ORDERING GUIDE Model Temperature Range AD536AJD 0°C to +70°C 1 AD536AJDZ 0°C to +70°C AD536AKD 0°C to +70°C 1 AD536AKDZ 0°C to +70°C AD536AJH 0°C to +70°C AD536AJHZ 1 0°C to +70°C AD536AKH 0°C to +70°C AD536AKHZ 1 0°C to +70°C AD536AJQ 0° ...

Page 16

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