ALD521DPD ALD [Advanced Linear Devices], ALD521DPD Datasheet

ALD521DPD

Manufacturer Part Number

ALD521DPD

Description

24 BIT SERIAL INTERFACE DIGITAL CONTROLLER

Manufacturer

ALD [Advanced Linear Devices]

Datasheet

1.ALD521DPD.pdf (6 pages)

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ORDERING INFORMATION

APPLICATIONS

• Operate in conjunction with ALD500/ALD500R

• High accuracy DC voltage measurement functions

• Portable battery operated instruments

• PC-based software control or stand-alone operation (without

• Serial digital output interface to other microprocessors or

GENERAL DESCRIPTION

The ALD521D is a digital controller designed to interface to the ALD500

or ALD500R integrating dual slope analog processors as a chip set for

building a precision analog-to-digital converter. With the ALD521D and

ALD500R, together with a few external capacitors and resistors, a

precision Analog to Digital converter with auto zero and auto-polarity

can be implemented.

The ALD521D can operate in either a stand-alone mode or in an

external microprocessor control mode. In the stand-alone mode, the

ALD521D can either making continuous measurements or a single

measurement. Under external microprocessor control, the ALD521D

can directly interact with a PC under PC software control via a standard

parallel printer port with no other components, or it can also communicate

with other microcontrollers serially.

The ALD500/ALD500R analog processors consist of on-chip digital

control circuitry to accept control inputs, integrating buffer amplifiers,

analog switches, and voltage comparators. It functions in four operating

modes, or phases, namely auto zero, integrate, deintegrate, and

integrator zero phases. At the end of a conversion, the comparator

output goes from high to low when the integrator crosses zero during

deintegration.

interface to CMOS logic families.

microcontrollers

Contact factory for industrial temperature range

Precision analog signal processors

other processors or PC)

0 C to +70 C

18-Pin

Plastic Pin

Package

ALD521DPD

INEAR

DVANCED

EVICES,

ALD500 analog processors also provide direct logic

Operating Temperature Range *

NC.

24 BIT SERIAL INTERFACE DIGITAL CONTROLLER

0 C to +70 C

18-Pin

Small Outline

Package (SOIC)

ALD521DSD

http://www.aldinc.com

PIN CONFIGURATION

FEATURES AND BENEFITS

• Low cost, simple functionality

• PC parallel printer port interface standard

• Support resolution up to 23 binary bits + sign

• Easy to use to acquire up to 23 bit linearity

• Integration time can be set by the user

• Easy user evaluation and setting of

• Low power dissipation - 4 mA typical

• On-chip Crystal Oscillator Circuit

• Two way asynchronous handshake data

• Conversion speed versus resolution trade-off

• Power down (sleep mode) control input to

• Chip Select control input

• High impedance DV, D

• Single 3 V to 5 V power supply

XTAL

polarity bit

and noise performance

conversion parameters

including crystal oscillator

transfer

power down to 2 A

when chip not selected

PWRUP

Note: N/C - No Conncection

XTAL

OUT

CLK

OUT

V +

PD, SD PACKAGE

ALD521D

OUT

and S

CLK

ALD521D

DGND

N/C

OUT

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ALD521DPD Summary of contents

Page 1

... Operating Temperature Range * +70 C 18-Pin Plastic Pin Package ALD521DPD * Contact factory for industrial temperature range © 2000 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 FEATURES AND BENEFITS • Low cost, simple functionality • ...

Page 2

GENERAL DESCRIPTION (cont'd) The ALD521D implements all the four phases of the ALD500 or ALD500R, namely auto zero, integrate, deintegrate, and integrator zero phases. It also provides direct logic interface to CMOS logic families. The ALD521D operates from an external ...

Page 3

ABSOLUTE MAXIMUM RATINGS + Supply voltage, V Differential input voltage range Power dissipation Operating temperature range Storage temperature range Lead temperature, 10 seconds OPERATING ELECTRICAL CHARACTERISTICS +5V unless otherwise specified Parameter ...

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ALD521DPD ALD [Advanced Linear Devices], ALD521DPD Datasheet

ALD521DPD

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ALD521DPD Summary of contents

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