AD5252 Datasheet

IC型号：
AD5252
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Dual 64-and 256-Position I2C Nonvolatile Memory Digital Pote...
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Dual 64-and 256-Position I

C Nonvolatile

Memory Digital Potentiometers

AD5251/AD5252

FEATURES

AD5251: Dual 64-position resolution

AD5252: Dual 256-position resolution

1 k鈩? 10 k鈩? 50 k鈩? 100 k鈩?/div>

Nonvolatile memory

stores wiper setting w/write protection

Power-on refreshed with EEMEM settings in 300 碌s typ

EEMEM rewrite time = 540 碌s typ

Resistance tolerance stored in nonvolatile memory

12 extra bytes in EEMEM for user-defined information

C compatible serial interface

Direct read/write access of RDAC

and EEMEM registers

Predefined linear increment/decrement commands

Predefined 卤6 dB step change commands

Synchronous or aysynchronous dual channel update

Wiper setting read back

4 MHz bandwidth鈥? k鈩?version

Single supply 2.7 V to 5.5 V

Dual supply 卤2.25 V to 卤2.75 V

2 slave address decoding bits allow operation of 4 devices

100-year typical data retention T

= 55掳C

Operating temperature 鈥?0掳C to +85掳C

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

FUNDAMENTAL BLOCK DIAGRAM

DGND

SCL

SDA

DATA

SERIAL

INTERFACE

AD0

AD1

CONTROL

COMMAND

DECODE LOGIC

ADDRESS

DECODE LOGIC

CONTROL LOGIC

RDAC3

REGIS-

TER

RDAC3

RDAC EEMEM

EEMEM

POWER-ON

REFRESH

RAB

TOL

RDAC1

REGIS-

TER

RDAC1

Figure 1.

APPLICATIONS

Mechanical potentiometer replacement

General purpose DAC replacement

LCD panel V

COM

adjustment

The terms nonvolatile memory and EEMEM are used interchangeably.

The terms digital potentiometer and RDAC are used interchangeably.

GENERAL DESCRIPTION

The AD5251/AD5252 are dual-channel, I

C, nonvolatile mem-

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鈥?versatile programmability allows

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

RDAC and EEMEM registers, increment/decrement of

resistance, resistance changes in 卤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

C controllers to write

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

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

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 鈥? dB step change in

synchronous or asynchronous channel update modes. The

increment and decrement functions allow stepwise linear

adjustments, while 卤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 k鈩? 10 k鈩? 50 k鈩? and 100 k鈩?options and all parts can

operate over the 鈥?0掳C to +85掳C extended industrial

temperature range.

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.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

03823-0-001

POWER-

ON RESET

AD5251/

AD5252

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