AS1506

256-Tap Digita l Potentiometer with SPI Interface and

High Endurance EEPROM

Produ ct Brief

www.austriamicrosystems.com

Revision 1.01

1 - 2

1 General Description

The AS1506 is a linear, 256-tap digital potentiometer

specifically designed to replace discrete/mechanical

potentiometers and is ideal for applications requiring a

low-temperature-coefficient variable resistor, such as

low-drift, programmable gain, and amplifier circuit con-

figurations.

The device is controlled via a 3-wire SPI-compatible

interface and features an internal EEPROM for storing

wiper positions.

Several device variants are available differentiated by

end-to-end resistance as shown in Table 1.

The 3-wire SPI-compatible serial interface allows com-

munication at data rates up to 5MHz.The internal

EEPROM stores the last wiper position for initialization

during power-up and a low-power standby mode.

The devices are available in an 8-pin TDFN 3x3mm

package.

Figure 1. Block Diagram

2 Key Features

!

High Endurance: EEPROM up to 10M cycles

!

High Reliability: EEPROM up to 150 years data

retension @ 85°C

!

Wiper Position Retained in EEPROM and loaded at

Power-Up

!

256 Tap Positions

!

±0.5LSB DNL in Voltage Divider Mode

!

±0.5LSB INL in Voltage Divider Mode

!

End-to-End Resistance: 10/50/100k

Ω

!

Low End-to-End Resistance Temperature

Coefficient: 90ppm/ºC

!

Low-Power Standby Mode: 100nA

!

5MHz SPI-Compatible Serial Interface

!

Single-Supply Operation: +2.7 to +5.5V

!

8-pin TDFN 3x3mm Package

3 Applications

The device is ideal for mechanical potentiometer

replacement, low-drift programmable gain amplifiers,

audio volume control, LCD contrast control, and low-drift

programmable filters.

Table 1. Standard Products

Model

End-to-End Resistance (k

Ω)

AS1506-10

10

AS1506-50

50

AS1506-100

100

256-Position

Decoder

8-Bit

EEPROM

8-Bit

Latch

SPI

Interface

8-Bit

Shift Register

8-Bit

Latch

8-Bit

EEPROM

AS1506

256-Position

Decoder

8

8

256

2

SCLK

1

3

SDIO

4

CSN

6

LOW

5

GND

7

WIPER

8

HIGH

Power-

On

Reset

SPI

Interface