ALD500 ALD [Advanced Linear Devices], ALD500 Datasheet

ALD500

Manufacturer Part Number

ALD500

Description

PRECISION INTEGRATING ANALOG PROCESSOR

Manufacturer

ALD [Advanced Linear Devices]

Datasheet

1.ALD500.pdf (11 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

ALD500APC

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ORDERING INFORMATION

APPLICATIONS

• 4 1/2 digits to 5 1/2 digits plus sign measurements

• Precision analog signal processor

• Precision sensor interface

• High accuracy DC measurement functions

• Portable battery operated instruments

• Computer peripheral

• PCMCIA

GENERAL DESCRIPTION

The ALD500AU/ALD500A/ALD500 are integrating dual slope analog

processors, designed to operate on 5V power supplies for building

precision analog-to-digital converters. The ALD500AU/ALD500A/

ALD500 feature specifications suitable for 18 bit/17 bit/16 bit resolution

conversion, respectively. Together with three capacitors, one resistor,

a precision voltage reference, and a digital controller, a precision

Analog to Digital converter with auto zero can be implemented. The

digital controller can be implemented by an external microcontroller,

under either hardware (fixed logic) or software control. For ultra high

resolution applications, up to 23 bit conversion can be implemented with

an appropriate digital controller and software.

The ALD500 series of analog processors accept differential inputs and

the external digital controller first counts the number of pulses at a fixed

clock rate that a capacitor requires to integrate against an unknown

analog input voltage, then counts the number of pulses required to

deintegrate the capacitor against a known reference voltage. This

unknown analog voltage can then be converted by the microcontroller

to a digital word, which is translated into a high resolution number,

representing an accurate reading. This reading, when ratioed against

the reference voltage, yields an accurate, absolute voltage measurement

reading.

The ALD500 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.

ALD500 analog processors also provide direct logic interface to CMOS

logic families.

0 C to +70 C

16-Pin

Plastic Pin

Package

ALD500PC (16 bit)

ALD500APC (17 bit)

ALD500AUPC (18 bit)

Contact factory for industrial temperature range

INEAR

DVANCED

EVICES,

Operating Temperature Range *

NC.

0 C to +70 C

16-Pin

Small Outline

Package (SOIC)

ALD500SC (16 bit)

ALD500ASC (17 bit)

ALD500AUSC (18 bit)

PRECISION INTEGRATING ANALOG PROCESSOR

0 C to +70 C

16-Pin Wide Body

Small Outline

Package (SOIC)

ALD500SWC (16 bit)

ALD500ASWC (17 bit)

ALD500AUSWC (18 bit)

http://www.aldinc.com

PIN CONFIGURATION

BENEFITS

• Wide dynamic signal range

• Very high noise immunity

• Low cost, simple functionality

• Automatic compensation and cancellation of

• Easy to use to acquire true 18 bit,17 bit, or

• Inherently linear and stable with temperature

FEATURES

• Resolution up to 18 bits plus sign bit

• Accuracy independent of input source

• High input impedance of 10

• Inherently filters and integrates any

• Differential analog input

• Wide bipolar analog input voltage

• Automatic zero offset compensation

• Low linearity error - as low as 0.002%

• Fast zero-crossing comparator - 1 s

• Low power dissipation - 6mW typical

• Automatic internal polarity detection

• Low input current - 2pA typical

• Microprocessor controlled conversion

• Optional digital control from a microcon-

• Flexible conversion speed versus resolution

C +

AGND

V -

C -

error sources

16 bit conversion and noise performance

and component variations

and over-range bit

impedances

external noise spikes

range 3.5V

troller, an ASIC, or a dedicated digital circuit

trade-off

REF

INT

V -

ALD500AU/ALD500A/ALD500

PC, SC, SWC PACKAGE

ALD500

V +

DGND

V -

OUT

REF

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