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AD5258EVAL2 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD5258EVAL2 bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 24 page Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer AD5258 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 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Nonvolatile memory maintains wiper settings 64-position Compact MSOP-10 (3 mm × 4.9 mm) package I2C®-compatible interface VLOGIC pin provides increased interface flexibility End-to-end resistance 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Resistance tolerance stored in EEPROM (0.1% accuracy) Power-on EEPROM refresh time <1 ms Software write protect command Three-state Address Decode Pins AD0 and AD1 allow 9 packages per bus 100-year typical data retention at 55°C Wide operating temperature −40°C to +85°C 3 V to 5 V single supply APPLICATIONS LCD panel VCOM adjustment LCD panel brightness and contrast control Mechanical potentiometer replacement in new designs Programmable power supplies RF amplifier biasing Automotive electronics adjustment Gain control and offset adjustment Fiber to the home systems Electronics level settings GENERAL DESCRIPTION The AD5258 provides a compact, nonvolatile 3 mm × 4.9 mm packaged solution for 64-position adjustment applications. These devices perform the same electronic adjustment function as mechanical potentiometers1 or variable resistors, but with enhanced resolution and solid-state reliability. The wiper settings are controllable through an I2C-compatible digital interface that is also used to read back the wiper register and EEPROM content. Resistor tolerance is also stored within EEPROM providing an end-to-end tolerance accuracy of 0.1%. There is also a software write protection function that ensures data cannot be written to the EEPROM register. A separate VLOGIC pin delivers increased interface flexibility. For users who need multiple parts on one bus, Address Bit AD0 and Address Bit AD1 allow up to nine devices on the same bus. FUNCTIONAL BLOCK DIAGRAMS RDAC REGISTER RDAC DATA CONTROL COMMAND DECODE LOGIC ADDRESS DECODE LOGIC CONTROL LOGIC AD5258 I2C SERIAL INTERFACE POWER- ON RESET A W B SCL SDA AD0 AD1 VDD VLOGIC GND RDAC EEPROM 6 6 Figure 1. Block Diagram COMMAND DECODE LOGIC ADDRESS DECODE LOGIC CONTROL LOGIC SCL SDA AD0 AD1 GND EEPROM I2C SERIAL INTERFACE RDAC REGISTER AND LEVEL SHIFTER A W B VLOGIC VDD Figure 2. Block Diagram Showing Level Shifters CONNECTION DIAGRAM AD5258 TOP VIEW (Not to Scale) W 1 AD0 2 AD1 3 SDA 4 SCL 5 A B VDD GND VLOGIC 10 9 8 7 6 Figure 3. Pinout 1 The terms digital potentiometer, VR (variable resistor), and RDAC are used interchangeably. |
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