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AD5251

更新时间： 2024-11-03 22:53:27

品牌	Logo	应用领域
亚德诺 - ADI		电位器存储
页数	文件大小	规格书
28页	1181K
描述
Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers

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AD5251 数据手册

Dual 64-and 256-Position I²C Nonvolatile

Memory Digital Potentiometers

AD5251/AD5252

White LED brightness adjustment

FEATURES

AD5251: Dual 64-position resolution

AD5252: Dual 256-position resolution

1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

Nonvolatile memory¹stores wiper setting w/write protection

Power-on refreshed with EEMEM settings in 300 µs typ

EEMEM rewrite time = 540 µs typ

RF base station power amp bias control

Programmable gain and offset control

Programmable voltage-to-current conversion

Programmable power supply

Sensor calibrations

Resistance tolerance stored in nonvolatile memory

12 extra bytes in EEMEM for user-defined information

I²C compatible serial interface

Direct read/write access of RDAC²and EEMEM registers

Predefined linear increment/decrement commands

Predefined 6 dB step change commands

Synchronous or aysynchronous dual channel update

Wiper setting read back

FUNDAMENTAL BLOCK DIAGRAM

RDAC EEMEM

RDAC1

REGIS-

TER

EEMEM

POWER-ON

REFRESH

RAB

TOL

DGND

DATA

RDAC3

SCL

SDA

RDAC3

REGIS-

TER

I C

SERIAL

INTERFACE

CONTROL

AD0

AD1

COMMAND

DECODE LOGIC

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_A= 55°C

Operating temperature –40°C to +85°C

ADDRESS

DECODE LOGIC

AD5251/

AD5252

POWER-

ON RESET

CONTROL LOGIC

Figure 1.

APPLICATIONS

¹The terms nonvolatile memory and EEMEM are used interchangeably.

²The terms digital potentiometer and RDAC are used interchangeably.

Mechanical potentiometer replacement

General purpose DAC replacement

LCD panel V_COMadjustment

they are restored automatically to the RDAC registers at system

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

GENERAL DESCRIPTION

The AD5251/AD5252 are dual-channel, I²C, 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’ 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 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 allow the host I²C 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,

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.

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

Fax: 781.326.8703

www.analog.com

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与AD5251相关器件

型号	品牌	获取价格	描述	数据表
AD5251_12	ADI	获取价格	Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251_15	ADI	获取价格	Dual 64-/256-Position IC Nonvolatile Memory Digital Potentiometers
AD5251BRU1	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU10	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU100	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU100-RL7	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU10-RL7	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU1-RL7	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU50	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5251BRU50-RL7	ADI	获取价格	Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers

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