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AD5235BRU25-EP-RL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD5235BRU25-EP-RL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page Nonvolatile Memory, Dual 1024-Position Digital Potentiometer AD5235-EP Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Dual-channel, 1024-position resolution 25 kΩ nominal resistance 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 SPI-compatible serial interface 3 V to 5 V single supply or ±2.5 V dual supply 26 bytes extra nonvolatile memory for user-defined information 100-year typical data retention, TA = 55°C Power-on refreshed with EEMEM settings Enhanced Features 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 APPLICATIONS 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 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-EP’s 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. FUNCTIONAL BLOCK DIAGRAM ADDR DECODE AD5235-EP RDAC1 SERIAL INTERFACE CS CLK SDI SDO PR WP RDY RDAC1 REGISTER EEMEM1 RDAC2 REGISTER EEMEM2 26 BYTES RTOL* USER EEMEM POWER-ON RESET W1 B1 RDAC2 W2 B2 A1 VDD A2 VSS GND EEMEM CONTROL *RAB TOLERANCE 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. The EEMEM content can be restored dynamically or through external PR strobing, and a WP function protects EEMEM contents. 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. 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. 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. |
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