ALD500ASC datasheet(6/11 Pages) ALD

6 / 11 page

Advanced Linear Devices

ALD500AU/ALD500A/ALD500

1CINT

Integrator capacitor connection.

2V-

Negative power supply.

3CAZ

The Auto-zero capacitor connection.

BUF

The Integrator resistor buffer connection.

AGND

This pin is analog ground.

6C-REF

Negative reference capacitor connection.

7C+REF

Positive reference capacitor connection.

8V-REF

External voltage reference (-) connection.

9V+REF

External voltage reference (+) connection.

V-IN

Negative analog input.

V+IN

Positive analog input.

Converter phase control MSB Input.

Converter phase control LSB Input.

COUT

Comparator output. COUT is HIGH during the Integration phase when a positive input voltage is being integrated and

is LOW when a negative input voltage is being integrated. A HIGH-to-LOW transition on COUT signals the processor

that the Deintegrate phase is completed. COUT is undefined during the Auto-Zero phase. It should be monitored to

time the Integrator Zero phase.

DGND

Digital ground.

V+

Positive power supply.

PIN DESCRIPTION

Pin No.

Symbol

Description

Switch Functions

Input

Reference Input

Auto Zero

Reference

VIN=AGND

System

Connect

Polarity

Sample

Offset

Conversion

Control

Phase

Logic

SWIN

SW+R or SW-R

SWAZ

SWR

SWG

SWS

Auto Zero

A = 0, B = 1

Open

Closed

Open

Input Signal

A = 1, B = 0

Closed

Open

Integration

Reference Voltage

A = 1, B = 1

Open

Closed*

Open

Closed

Open

Deintegration

Integrator

A = 0, B = 0

Open

Closed

Output Zero

*SW+R would be closed for a positive input signal. SW-R would be closed for a negative input signal.

Table 1. Conversion Phase and Control Logic Internal Analog Switch Functions

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