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1 / 28 page Quad 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers AD5253/AD5254 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 AD5253: Quad 64-position resolution AD5254: Quad 256-position resolution 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Nonvolatile memory1 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 I2C® compatible serial interface Direct read/write accesses of RDAC2 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 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 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 The AD5253/AD5254 are quad 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 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 I2C SERIAL INTERFACE VDD A0 W0 B0 A1 W1 B1 A2 W2 B2 A3 W3 B3 VSS DGND SCL SDA AD0 AD1 WP EEMEM POWER-ON REFRESH RAB TOL RDAC EEMEM Figure 1. The AD5253/AD5254 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 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 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are guaranteed to operate over the –40°C to +85°C extended industrial temperature range. 1The terms nonvolatile memory and EEMEM are used interchangeably. 2The terms digital potentiometer and RDAC are used interchangeably. |
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