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AD5252BRU50 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD5252BRU50 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 28 page Dual 64- and 256-Position I2C Nonvolatile Memory Digital Potentiometers AD5251/AD5252 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 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. 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 aysynchronous dual channel update Wiper setting read back 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 TA = 55°C Operating temperature –40°C to +85°C APPLICATIONS Mechanical potentiometer replacement General purpose DAC replacement LCD panel VCOM 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 FUNDAMENTAL 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. 1The terms nonvolatile memory and EEMEM are used interchangeably. 2The terms digital potentiometer and RDAC are used interchangeably. 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 infor- mation such as memory data for other components, look-up table, or system identification information. The AD5251/AD5252 allow the host I2C 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 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options and all parts can operate over the –40°C to +85°C extended industrial temperature range. |
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