Data Sheet

AD5122A/AD5142A

Dual Channel, 128-/256-Position, I2C, Nonvolatile Digital Potentiometer

Rev. D

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FEATURES

►

10 kΩ and 100 kΩ resistance options

►

Resistor tolerance: 8% maximum

►

Wiper current: ±6 mA

►

Low temperature coefficient: 35 ppm/°C

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Wide bandwidth: 3 MHz

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Fast start-up time < 75 µs

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Linear gain setting mode

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Single- and dual-supply operation

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Independent logic supply: 1.8 V to 5.5 V

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Wide operating temperature: −40°C to +125°C

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3 mm × 3 mm package option

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Qualified for automotive applications

APPLICATIONS

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Portable electronics level adjustment

►

LCD panel brightness and contrast controls

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Programmable filters, delays, and time constants

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Programmable power supplies

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The AD5122A/AD5142A potentiometers provide a nonvolatile solu-

tion for 128-/256-position adjustment applications, offering guaran-

teed low resistor tolerance errors of ±8% and up to ±6 mA current

density in the Ax, Bx, and Wx pins.

The low resistor tolerance and low nominal temperature coefficient

simplify open-loop applications as well as applications requiring

tolerance matching.

The linear gain setting mode allows independent programming of

the resistance between the digital potentiometer terminals, through

RAW and RWB the string resistors, allowing very accurate resistor

matching.

The high bandwidth and low total harmonic distortion (THD) ensure

optimal performance for ac signals, making it suitable for filter

design.

The low wiper resistance of only 40 Ω at the ends of the resistor

array allows for pin-to-pin connection.

The wiper values can be set through an I2C-compatible digital

interface that is also used to read back the wiper register and

EEPROM contents.

The AD5122A/AD5142A are available in a compact, 16-lead, 3 mm

× 3 mm LFCSP and a 16-lead TSSOP. The parts are guaranteed to

operate over the extended industrial temperature range of −40°C to

+125°C.

Table 1. Family Models

Model

Channel

Position

Interface

Package

AD51231

Quad

128

I2C

LFCSP

AD5124

Quad

128

SPI/I2C

LFCSP

AD5124

Quad

128

SPI

TSSOP

AD51431

Quad

256

I2C

LFCSP

AD5144

Quad

256

SPI/I2C

LFCSP

AD5144

Quad

256

SPI

TSSOP

AD5144A

Quad

256

I2C

TSSOP

AD5122

Dual

128

SPI

LFCSP/TSSOP

AD5122A

Dual

128

I2C

LFCSP/TSSOP

AD5142

Dual

256

SPI

LFCSP/TSSOP

AD5142A

Dual

256

I2C

LFCSP/TSSOP

AD5121

Single

128

SPI/I2C

LFCSP

AD5141

Single

256

SPI/I2C

LFCSP

1 Two potentiometers and two rheostats.