AS1534

12-bit, 8-Channel, Low-Power, 200ksps A/D Converter

Produ ct Brief

www.austriamicrosystems.com

Revision 1.03

1 - 2

1 General Description

The AS1534 is a low-power, 8-channel, 200ksps, 12-bit

analog-to-digital (A/D) converter specifically designed to

operate with single-supply devices. Superior AC charac-

teristics, very low power-consumption, and highly-reli-

able packaging make the AS1534 perfect for battery-

powered remote-sensor and data-acquisition devices.

The successive-approximation register (SAR), high-

speed sampling, high-bandwidth track/hold circuitry, and

configurable inputs combine to make the AS1534 highly-

flexible and configurable.

Internal registers are used to control the AS1534 fea-

tures, report on the status of the device, and hold the

A/D conversion results.

The device requires very low supply-current at the

200ksps max sampling speed, and features flexible

power-down modes to reduce power consumption at

slower throughput rate.

The AS1534 operates from a single +3 to +3.6V supply

and contains an internal 2.5V reference and integrated

reference buffer. The device also supports an external

reference.

Data accesses are made via the fast 8-/16-bit parallel

interface in support of a wide range of microprocessors.

The AS1534 is available in a 44-pin PQFP package.

Figure 1. Block Diagram

2 Key Features

!

Sampling Rate: 200ksps

!

8- and 16-Bit Parallel Interface

!

Analog Input Types:

- 8-Channel Single-Ended

- 4-Channel Pseudo-Differential

- 4-Channel Fully-Differential

!

Software-Configurable Unipolar or Bipolar Inputs

!

Internal +2.5V Reference

!

!

Low-Power Operation:

- 1.5mW (Using Automatic Power-Down after Con-

!

Single-Supply Operation: +3 to +3.6V

!

44-pin PQFP Package

3 Applications

The device is ideal for remote sensors, data-acquisition

and data-logging devices, pen-digitizers, process con-

trol, or any other space-limited A/D application with low

power-consumption requirements.

8:15

AIN0:AIN7

AS1534

12-Bit SAR

and A/D

Conversion

Control

+2.5V

REF

I/P

MUX

REFIN/

REFOUT

DB0:DB15

40

BUSY

41

CONVSTN

39

CLKIN

28

DGND

27

18

SLEEPN

Track/

Hold

Comp-

arator

3

Buffer

7

Parallel Interface

Controller Register

6

Charge

Redistribution

DAC

43

RDN

44

CSN

2

WBN

42

WRN

5

AGND

4

29

DB8/HBEN

150k

Ω