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AD5235-EP

更新时间: 2024-11-07 12:26:31
品牌 Logo 应用领域
亚德诺 - ADI 数字电位计
页数 文件大小 规格书
16页 376K
描述
Nonvolatile Memory, Dual 1024-Position Digital Potentiometer

AD5235-EP 数据手册

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Nonvolatile Memory, Dual  
1024-Position Digital Potentiometer  
AD5235-EP  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Dual-channel, 1024-position resolution  
25 kΩ nominal resistance  
AD5235-EP  
V
ADDR  
DECODE  
DD  
RDAC1  
REGISTER  
CS  
CLK  
SDI  
A1  
Low temperature coefficient: 35 ppm/°C  
Nonvolatile memory stores wiper settings  
Permanent memory write protection  
Wiper setting readback  
Resistance tolerance stored in EEMEM  
Predefined linear increment/decrement instructions  
Predefined 6 dB/step log taper increment/decrement  
instructions  
W1  
SERIAL  
INTERFACE  
B1  
RDAC1  
SDO  
EEMEM1  
POWER-ON  
RESET  
PR  
RDAC2  
REGISTER  
A2  
WP  
EEMEM  
CONTROL  
W2  
RDY  
B2  
RDAC2  
EEMEM2  
SPI-compatible serial interface  
V
SS  
26 BYTES  
USER EEMEM  
3 V to 5 V single supply or 2.5 V dual supply  
26 bytes extra nonvolatile memory for user-defined  
information  
RTOL*  
GND  
*RAB TOLERANCE  
100-year typical data retention, TA = 55°C  
Power-on refreshed with EEMEM settings  
Enhanced Features  
Figure 1.  
In scratchpad programming mode, a specific setting can be  
programmed directly to the RDAC2 register that sets the resistance  
between Terminal W and Terminal A, and Terminal W and  
Terminal B. This setting can be stored into the EEMEM and  
is restored automatically to the RDAC register during system  
power-on.  
Supports defense and aerospace applications (AQEC)  
Temperature range: −40°C to +125°C  
Controlled manufacturing baseline  
1 assembly/test site  
1 fabrication site  
Enhanced product change notification  
Qualification data available on request  
The EEMEM content can be restored dynamically or through  
PR  
WP  
external strobing, and a  
function protects EEMEM contents.  
APPLICATIONS  
To simplify the programming, the independent or simultaneous  
linear-step increment or decrement commands can be used to move  
the RDAC wiper up or down, one step at a time. For logarithmic  
6 dB changes in the wiper setting, the left or right bit shift  
command can be used to double or halve the RDAC wiper setting.  
DWDM laser diode driver, optical supervisory systems  
Mechanical potentiometer replacement  
Instrumentation: gain, offset adjustment  
Programmable voltage-to-current conversion  
Programmable filters, delays, time constants  
Programmable power supply  
The AD5235-EP patterned resistance tolerance is stored in the  
EEMEM. Therefore, in readback mode, the host processor can  
know the actual end-to-end resistance. The host can execute the  
appropriate resistance step through a software routine that simplifies  
open-loop applications as well as precision calibration and  
tolerance matching applications.  
Low resolution DAC replacement  
Sensor calibration  
GENERAL DESCRIPTION  
The AD5235-EP is a dual-channel, nonvolatile memory,1  
digitally controlled potentiometer2 with 1024-step resolution.  
The device performs the same electronic adjustment function as a  
mechanical potentiometer with enhanced resolution, solid state  
reliability, and superior low temperature coefficient performance.  
The AD5235-EPs versatile programming via an SPI®-compatible  
serial interface allows 16 modes of operation and adjustment  
including scratchpad programming, memory storing and restoring,  
increment/decrement, 6 dB/step log taper adjustment, wiper setting  
readback, and extra EEMEM1 for user-defined information such as  
memory data for other components, look-up tables, or system  
identification information.  
The AD5235-EP is available in a thin, 16-lead TSSOP package.  
The part is guaranteed to operate over the extended industrial  
temperature range of −40°C to +125°C.  
Full details about this enhanced product, including theory of  
operation, register details, and applications information, are  
available in the AD5235 data sheet, which should be consulted  
in conjunction with this data sheet.  
1 The terms nonvolatile memory and EEMEM are used interchangeably.  
2 The terms digital potentiometer and RDAC are used interchangeably.  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2010 Analog Devices, Inc. All rights reserved.  
 
 
 

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