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参数资料
型号： AD5253
厂商： Analog Devices, Inc.
元件分类： 通用总线功能
英文描述： Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
中文描述： 双路、256抽头、非易失、I2C接口、数字电位器
文件页数： 1/28页
文件大小： 834K
代理商： AD5253
Quad 64-/256-Position I
2
C Nonvolatile
Memory Digital Potentiometers
AD5253/AD5254
FEATURES
AD5253: Quad 64-position resolution
AD5254: Quad 256-position resolution
1
stores wiper settings with write
protection
Power-on refreshed to 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 accesses of RDAC
2
and EEMEM registers
Predefined linear increment/decrement commands
Predefined ±6 dB step change commands
Synchronous or asynchronous quad channel update
Wiper setting readback
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
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
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
The AD5253/AD5254 are quad 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 AD5253/AD5254’s 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 ±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.
FUNCTIONAL BLOCK DIAGRAM
RDAC0
REGIS-
TER
RDAC1
REGIS-
TER
RDAC2
REGIS-
TER
RDAC3
REGIS-
TER
RDAC0
RDAC1
RDAC2
RDAC3
DATA
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
AD5253/AD5254
I
2
C
SERIAL
INTERFACE
V
DD
V
SS
A0
W0
B0
A1
W1
B1
A2
W2
B2
A3
W3
B3
DGND
WP
SCL
SDA
AD0
AD1
0
EEMEM
POWER-ON
REFRESH
R
AB
TOL
RDAC EEMEM
Figure 1.
The AD5253/AD5254 allow the host I
2
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 –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 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, 10 k, 50 k, and 100 k options. All parts are
guaranteed to operate over the –40°C to +85°C extended
industrial temperature range.
1
The terms nonvolatile memory and EEMEM are used interchangeably.
2
The terms digital potentiometer and RDAC are used interchangeably.
相关PDF资料
PDF描述
AD5253BRU1 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_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)
AD5253BRU100-RL7 制造商:Analog Devices 功能描述:Digital Potentiometer 64POS 100KOhm Quad 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:DGTL POTENTIOMETER 64POS 100KOHM QUAD 20TSSOP - Tape and Reel
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