AD5251 Analog Devices, AD5251 Datasheet

AD5251

Manufacturer Part Number

AD5251

Description

(AD5251 / AD5252) Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers

Manufacturer

Analog Devices

Datasheet

1.AD5251.pdf (28 pages)

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FEATURES

AD5251: Dual 64-position resolution

AD5252: Dual 256-position resolution

1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

Nonvolatile memory

Power-on refreshed with EEMEM settings in 300 µs typ

EEMEM rewrite time = 540 µs typ

Resistance tolerance stored in nonvolatile memory

12 extra bytes in EEMEM for user-defined information

Direct read/write access of RDAC

Predefined linear increment/decrement commands

Predefined ±6 dB step change commands

Synchronous or aysynchronous dual channel update

Wiper setting read back

4 MHz bandwidth—1 kΩ version

Single supply 2.7 V to 5.5 V

Dual supply ±2.25 V to ±2.75 V

2 slave address decoding bits allow operation of 4 devices

100-year typical data retention T

Operating temperature –40°C to +85°C

APPLICATIONS

Mechanical potentiometer replacement

General purpose DAC replacement

LCD panel V

GENERAL DESCRIPTION

The AD5251/AD5252 are dual-channel, I

ory, digitally controlled potentiometers with 64/256 positions,

respectively. These devices perform the same electronic adjust-

ment functions as mechanical potentiometers, trimmers, and

variable resistors. The parts’ versatile programmability allows

multiple modes of operation, including read/write access in the

RDAC and EEMEM registers, increment/decrement of

resistance, resistance changes in ±6 dB scales, wiper setting

readback, and extra EEMEM for storing user-defined infor-

mation such as memory data for other components, look-up

table, or system identification information.

The AD5251/AD5252 allow the host I

any of the 64- or 256-step wiper settings in the RDAC registers

and store them in the EEMEM. Once the settings are stored,

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

C compatible serial interface

COM

adjustment

stores wiper setting w/write protection

and EEMEM registers

= 55°C

C controllers to write

C, nonvolatile mem-

Dual 64-and 256-Position I

Memory Digital Potentiometers

White LED brightness adjustment

RF base station power amp bias control

Programmable gain and offset control

Programmable voltage-to-current conversion

Programmable power supply

Sensor calibrations

DGND

they are restored automatically to the RDAC registers at system

power-on; the settings can also be restored dynamically.

The AD5251/AD5252 provide additional increment,

decrement, +6 dB step change, and –6 dB step change in

synchronous or asynchronous channel update modes. The

increment and decrement functions allow stepwise linear

adjustments, while ±6 dB step changes are equivalent to

doubling or halving the RDAC wiper setting. These functions

are useful for steep-slope nonlinear adjustments such as white

LED brightness and audio volume control. The parts have a

patented resistance tolerance storing function which enable the

user to access the EEMEM and obtain the absolute end-to-end

resistance values of the RDACs for precision applications.

The AD5251/AD5252 are available in TSSOP-14 packages in

1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options and all parts can

operate over the –40°C to +85°C extended industrial

temperature range.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

The terms nonvolatile memory and EEMEM are used interchangeably.

The terms digital potentiometer and RDAC are used interchangeably.

SDA

SCL

AD0

AD1

INTERFACE

ON RESET

POWER-

SERIAL

FUNDAMENTAL BLOCK DIAGRAM

POWER-ON

CONTROL

REFRESH

EEMEM

DATA

RDAC EEMEM

Figure 1.

CONTROL LOGIC

AD5251/AD5252

DECODE LOGIC

RAB

TOL

COMMAND

ADDRESS

C Nonvolatile

RDAC1

REGIS-

RDAC3

REGIS-

TER

www.analog.com

AD5251/

AD5252

RDAC1

RDAC3

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