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AD5252BRU50 数据表(PDF) 1 Page - Analog Devices |
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AD5252BRU50 数据表(HTML) 1 Page - Analog Devices |
1 / 28 page Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers Data Sheet AD5251/AD5252 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2004–2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES AD5251: Dual 64-position resolution AD5252: Dual 256-position resolution 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Nonvolatile memory1 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 I2C-compatible serial interface Direct read/write access of RDAC2 and EEMEM registers Predefined linear increment/decrement commands Predefined ±6 dB step change commands Synchronous or asynchronous dual-channel update Wiper setting readback 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 +105°C APPLICATIONS Mechanical potentiometer replacement General-purpose DAC replacement LCD panel V COM adjustment 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 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 information, such as memory data for other components, look-up table, or system identification information. FUNCTIONAL BLOCK DIAGRAM RDAC1 REGIS- TER RDAC3 REGIS- TER RDAC1 RDAC3 DATA CONTROL COMMAND DECODE LOGIC ADDRESS DECODE LOGIC CONTROL LOGIC AD5251/ AD5252 I2C SERIAL INTERFACE POWER- ON RESET VDD A1 W1 B1 A3 W3 B3 VSS DGND SCL SDA AD0 AD1 WP RDAC EEMEM RAB TOL EEMEM POWER-ON REFRESH Figure 1. The AD5251/AD5252 allow the host I2C 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 AD5251/AD5252 provide additional increment, decrement, +6 dB step change, and –6 dB step change in synchronous or asynchronous channel update mode. The increment and decrement functions allow stepwise linear adjustments, with a ± 6 dB step change 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 AD5251/AD5252 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 AD5251/AD5252 are available in TSSOP-14 packages in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are guaranteed to operate over the –40°C to +105°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. |
类似零件编号 - AD5252BRU50 |
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类似说明 - AD5252BRU50 |
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