ALD500RAU/ALD500RA/ALD500R

Advanced Linear Devices

7

Bias circuit pin. Connect a 0.1

µF capacitor from this pin to V- to minimize noise.

Integrator capacitor connection.

3V-

Negative power supply.

The Auto-zero capacitor connection.

5

BUF

The Integrator resistor buffer connection.

6

AGND

This pin is analog ground.

Negative reference capacitor connection.

Positive reference capacitor connection.

9

N/C

Internally connected. Connect to V- for normal operation.

10

N/C

Internally connected. Connect to V- for normal operation.

11

External voltage reference (-) connection. High impedance load (

≥100MΩ) only.

12

External voltage reference (+) connection. High impedance load (

≥100MΩ) only.

13

Negative analog input.

14

Positive analog input.

15

A

Converter phase control MSB Input.

16

B

Converter phase control LSB Input.

17

time the Integrator Zero phase.

18

DGND

Digital ground.

19

Positive power supply.

20

Switch Functions

Input

Reference Input

Auto Zero

Reference

System

Connect

Polarity

Sample

Offset

Conversion

Control

Phase

Logic

Auto Zero

A = 0, B = 1

Open

Open

Closed

Closed

Closed

Open

Input Signal

A = 1, B = 0

Closed

Open

Open

Open

Open

Open

Integration

Reference Voltage

A = 1, B = 1

Open

Closed*

Open

Open

Closed

Open

Deintegration

Integrator

A = 0, B = 0

Open

Open

Open

Closed

Closed

Closed

Output Zero

PIN DESCRIPTION

Pin No.

Symbol

Description

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