AD5253 Datasheet

IC型号：
AD5253
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Quad 64-/256-Position I2C Nonvolatile Memory Digital Potenti...
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Quad 64-/256-Position I

C Nonvolatile

Memory Digital Potentiometers

AD5253/AD5254

FEATURES

AD5253: Quad 64-position resolution

AD5254: Quad 256-position resolution

1 k鈩? 10 k鈩? 50 k鈩? 100 k鈩?/div>

Nonvolatile memory

stores wiper settings with write

protection

Power-on refreshed to 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庐 compatible serial interface

Direct read/write accesses of RDAC

and EEMEM registers

Predefined linear increment/decrement commands

Predefined 卤6 dB step change commands

Synchronous or asynchronous quad channel update

Wiper setting readback

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

DGND

SCL

SDA

DATA

SERIAL

INTERFACE

AD0

AD1

CONTROL

COMMAND

DECODE LOGIC

ADDRESS

DECODE LOGIC

CONTROL LOGIC

RDAC3

REGIS-

TER

03824-0-001

FUNCTIONAL BLOCK DIAGRAM

RDAC EEMEM

EEMEM

POWER-ON

REFRESH

TOL

RDAC0

REGIS-

TER

RDAC0

RDAC1

REGIS-

TER

RDAC2

REGIS-

TER

AD5253/AD5254

Figure 1.

APPLICATIONS

Mechanical potentiometer replacement

Low resolution DAC replacement

RGB LED backlight control

White LED brightness adjustment

RF base station power amp bias control

Programmable gain and offset control

Programmable attenuators

Programmable voltage-to-current conversion

Programmable power supply

Programmable filters

Sensor calibrations

The AD5253/AD5254 allow the host I

C controllers to write any

of the 64-/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 AD5253/AD5254 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 adjustment applications such as white LED brightness

and audio volume control.

The AD5253/AD5254 have a patented resistance tolerance

storing function that allows the user to access the EEMEM and

obtain the absolute end-to-end resistance values of the RDACs

for precision applications.

The AD5253/AD5254 are available in TSSOP-20 packages in

1 k鈩? 10 k鈩? 50 k鈩? and 100 k鈩?options. All parts are

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

industrial temperature range.

GENERAL DESCRIPTION

The AD5253/AD5254 are quad 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 AD5253/AD5254鈥檚 versatile programmability allows multi-

ple modes of operation, including read/write accesses 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 informa-

tion, such as memory data for other components, look-up table,

or system identification information.

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.

The terms nonvolatile memory and EEMEM are used interchangeably.

The terms digital potentiometer and RDAC are used interchangeably.

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

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