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AD5255 데이터시트(PDF) 1 Page - Analog Devices |
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AD5255 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page 3-Channel Digital Potentiometer with Nonvolatile Memory AD5255 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 3 channels: Dual 512-position Single 128-position 25 kΩ or 250 kΩ full-scale resistance Low temperature coefficient: Potentiometer divider 15 ppm/°C Rheostat mode 35 ppm/ °C Nonvolatile memory retains wiper settings Permanent memory write protection Linear increment/decrement ±6 dB increment/decrement I2C-compatible serial interface 2.7 V to 5.5 V single-supply operation ±2.25 V to ±2.75 V dual-supply operation Power-on reset time 256 bytes general-purpose user EEPROM 11 bytes RDAC user EEPROM GBIC and SFP compliant EEPROM 100-year typical data retention at TA = 55°C APPLICATIONS Mechanical potentiometer replacement RGB LED backlight control White LED brightness adjustment Programmable gain and offset control Programmable filters FUNCTIONAL BLOCK DIAGRAM A0 W0 B0 A1 W1 B1 A2 W2 B2 A0 W0 B0 A0 W0 B0 A1 W1 B1 A1 W1 B1 A2 W2 B2 A2 W2 B2 RDAC0 9 BIT RDAC1 9 BIT RDAC2 7 BIT DATA CONTROL COMMAND DECODE LOGIC ADDRESS DECODE LOGIC DECODE LOGIC POWER-ON RESET I2C SERIAL INTERFACE 32 BYTES RDAC EEPROM 256 BYTES USER EEPROM VDD VSS GND SCL SDA A0_RDAC A1_RDAC A0_E A1_E RS WP Figure 1. GENERAL DESCRIPTION The AD5255 provides dual 512-position and a single 128-position digitally controlled variable resistors1 (VR) in a TSSOP package. This device performs the same electronic adjustment function as a potentiometer, trimmer, or variable resistor. Each VR offers a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. The fixed A-to-B terminal resistance of 25 kΩ or 250 kΩ has a 1% channel-to-channel matching tolerance and a nominal temperature coefficient of 35 ppm/°C. Wiper position programming, EEPROM2 reading, and EEPROM writing is conducted via the standard 2-wire I2C interface. Pre- vious/default wiper position settings can be stored in memory, and refreshed upon system power-up. Additional features of the AD5255 include preprogrammed linear and logarithmic increment/decrement wiper changing. The actual resistor tolerances are stored in EEPROM so that the actual end-to-end resistance is known, which is valuable for calibration in precision applications. The AD5255 is available in a 24-lead TSSOP package. All parts are guaranteed to operate over the extended industrial tempera- ture range of −40°C to +85°C. 1 The terms programmable resistor, variable resistor, RDAC, and digital potentiometer are used interchangeably. 2 The terms nonvolatile memory, EEMEM, and EEPROM are used interchangeably. |
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