AS1538

8-Channel, 12-Bit I²C Analog-to-Digital Converter

Produ ct Brief

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Revision 1.01

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1 General Description

The AS1538 is a single-supply, low-power, 12-bit data

acquisition device that features a serial I²C interface and

an 8-channel multiplexer.

The analog-to-digital (A/D) converter features a sample-

and-hold amplifier an internal asynchronous clock and

an internal reference.

The combination of an I

micropower consumption makes the AS1538 ideal for

applications requiring the A/D converter to be close to

the input source in remote locations and for applications

requiring isolation.

The device is available in a TSSOP-16 package.

Figure 1. Block Diagram

2 Key Features

!

Single Supply: 2.7 to 5.25V

!

8-Channel Multiplexer

!

Sampling Rate: 50kSPS

!

No Missing Codes

!

Internal Reference: 2.5V

!

High Speed I

!

<1.5µA Full Shutdown Current

!

TSSOP-16 Package

3 Applications

The device is ideal for voltage-supply monitoring, iso-

lated data acquisition, transducer interfaces, battery-

operated systems, remote data acquisition or any other

analog-to-digital conversion application.

12

A0

14

SCL

1

CH0

15

SDA

AS1538

8-Channel

MUX

2

CH1

3

CH2

4

CH3

5

CH4

6

CH5

7

CH6

8

CH7

10

Sample/

Hold

Amp

Successive Approximation Register

CDAC

Comparator

Serial

Interface

13

A1

Internal

2.5V

Reference

Buffer

9

GND

11

COM