Data Sheet AS1500/1/2/3

Revision 1.0, Oct 2004

Page 1 of 8

Key Features

-

256-Position

-

Available in four Resistance values

-

AS1500 resistance 10kOhms

-

AS1501 resistance 20kOhms

-

AS1502 resistance 50kOhms

-

AS1503 resistance 100kOhms

-

Power Shutdown —Less than 1 µA

-

3-Wire SPI-Compatible Serial Data Input

-

10 MHz Update Data Loading Rate

-

2.7 V to 5.5 V Single-Supply Operation

-

Temperature Range –40°C to +125°C

-

Package SO-8

-

Compatible to AD8400

General Description

The AS1500 is

a

digital

potentiometer

with

256

programmable steps. The values of the resistor can be

controlled via 3 wire serial interface capable to handle

programming rates up to 10MHz. The AS1500 is available in

four different resistor values. The AS1500 incorporates a

10k

Ω, the AS1501 a 20kΩ, the AS1502 a 50kΩ and the

AS1503 a 100k

Ω fixed resistor. The wiper contact taps the

fixed resistor at points determined by the 8-bit digital code

word. The resistance between the wiper and the endpoint of

the resistor is linear. The switching action is performed in a

way that no glitches occur. Furthermore the AS150x product

family includes a shutdown mode, where it consumes less

than 1µA. The AS150x is available in an 8-pin SOIC

package. All parts are guaranteed to operate over the

extended industrial temperature range of –40°C to +125°C.

Applications

-

Line Impedance Matching

-

Volume Control, Panning

-

Mechanical Potentiometer Replacement

-

Power Supply Adjustment

-

Programmable Filters, Delays, Time Constants

Figure 1

Pinout andfunctional Block Diagram of Digital Potentiometer AS150x family

PRELIMINARY FACT SHEET

Digital Potentiometer

AS1500/AS1501/AS1502/AS1503

DATASHEET

8-Bit

Latch

10 Bit

Serial

Latch

8

8

SDI

CK

CSN

A

W

B

VDD

GND

AS1500

W

VDD

GND

CSN

7

6

2

3

AS150x

Top View

CK

A

B

SDI

1

4

8

5