GENERAL DESCRIPTION

The AD5235-EP is a dual-channel, nonvolatile memory,digitally controlled potentiometer with 1024-step resolution. The device performs the same electronic adjustment function as a mechanical potentiometer with enhanced resolution, solid state reliability, and superior low temperature coefficient performance. The AD5235-EP’s versatile programming via an SPI®-compatible serial interface allows 16 modes of operation and adjustment including scratchpad programming, memory storing and restoring, increment/decrement, ±6 dB/step log taper adjustment, wiper setting readback, and extra EEMEM for user-defined information such as

memory data for other components, look-up tables, or system identification information.

FEATURES

Dual-channel, 1024-position resolution

25 kΩ nominal resistance

Low temperature coefficient: 35 ppm/°C

Nonvolatile memory stores wiper settings

Permanent memory write protection

Wiper setting readback

Resistance tolerance stored in EEMEM

Predefined linear increment/decrement instructions

Predefined ±6 dB/step log taper increment/decrement

instructions

SPI-compatible serial interface

2.7 V to 5 V single supply or ±2.5 V dual supply

26 bytes extra nonvolatile memory for user-defined

information

100-year typical data retention, TA= 55°C

Power-on refreshed with EEMEM settings

Enhanced Features

Supports defense and aerospace applications (AQEC)

Temperature range: −40°C to +125°C

Controlled manufacturing baseline

1 assembly/test site

1 fabrication site

Enhanced product change notification

Qualification data available on request

APPLICATIONS

DWDM laser diode driver, optical supervisory systems

Mechanical potentiometer replacement

Instrumentation: gain, offset adjustment

Programmable voltage-to-current conversion

Programmable filters, delays, time constants

Programmable power supply

Low resolution DAC replacement

Sensor calibration

ELECTRICAL CHARACTERISTICS

VDD= 2.7 V to 5.5 V, VSS= 0 V; VDD= 2.5 V, VSS= −2.5 V, VA= VDD, VB= VSS, −40°C