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参数资料
型号： AD5252EVAL
厂商： Analog Devices, Inc.
元件分类： 通用总线功能
英文描述： 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
中文描述： 32抽头、非易失、线性变化数字电位器，SOT23封装
文件页数： 1/28页
文件大小： 859K
代理商： AD5252EVAL
Dual 64-
and
256-Position I
2
C Nonvolatile
Memory Digital Potentiometers
AD5251/AD5252
FEATURES
AD5251: Dual 64-position resolution
AD5252: Dual 256-position resolution
1 k, 10 k, 50 k, 100 k
1
stores wiper setting w/write protection
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
I
2
C compatible serial interface
Direct read/write access of RDAC
2
and EEMEM registers
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 k 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
APPLICATIONS
Mechanical potentiometer replacement
General purpose DAC replacement
LCD panel V
COM
adjustment
GENERAL DESCRIPTION
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
2004 Analog Devices, Inc. All rights reserved.
www.analog.com
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
RDAC1
REGIS-
TER
RDAC3
REGIS-
TER
RDAC1
RDAC3
DATA
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
AD5251/
AD5252
I
2
C
SERIAL
INTERFACE
POWER-
ON RESET
V
DD
V
SS
A1
W1
B1
A3
W3
B3
DGND
WP
SCL
SDA
AD0
AD1
RDAC EEMEM
RAB
TOL
0
EEMEM
POWER-ON
REFRESH
Figure 1.
1
The terms nonvolatile memory and EEMEM are used interchangeably.
2
The terms digital potentiometer and RDAC are used interchangeably.
The AD5251/AD5252 are dual-channel, I
2
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’ 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
2
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 –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 k, 10 k, 50 k, and 100 k options and all parts can
operate over the –40°C to +85°C extended industrial
temperature range.
相关PDF资料
PDF描述
AD5253EVAL Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
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相关代理商/技术参数
参数描述
AD5253 制造商:AD 制造商全称:Analog Devices 功能描述:Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5253_12 制造商:AD 制造商全称:Analog Devices 功能描述:Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers
AD5253BRU1 功能描述:IC DGTL POT QUAD 1K I2C 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR)
AD5253BRU10 功能描述:IC DGTL POT QUAD 10K I2C 20TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR)
AD5253BRU100 功能描述:IC DGTL POT QUAD 100K 20-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR)
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