Description

The AS1507 is a linear, dual 256-tap digital potentiometer specifically designed to replace discrete/mechanical potentiometers and is ideal for applications requiring a low-temperature-coefficient variable resistor.
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 the following end-to-end resistance:

The 3-wire SPI-compatible serial interface allows communication 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.

Key Features

• High Endurance: EEPROM up to 10M cycles
• High Reliability: EEPROM up to 150 years data retention @ 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: 10/50/100kΩ
• 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
• TQFN 3x3mm 16-pin Package

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.

Block Diagram