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AD5235 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD5235 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 10 page PRELIMINARY TECHNICAL DATA a Nonvolatile Memory, Dual 1024 Position Digital Potentiometers AD5235 REV PrD 6 Nov 2000 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 U.S.A. Tel: 781/329-4700 Fax:781/326-8703 FEATURES Dual, 1024 Position Resolution 25K, 250K Ohm Terminal Resistance with 50ppm/°C Tempco Nonvolatile Memory Preset SPI Compatible Serial Data Input with Readback Function Increment/Decrement Commands, Push Button Command +3 to +5V Single Supply Operation ±2.5V Dual Supply Operation 30 bytes of general purpose nonvolatile memory APPLICATIONS Mechanical Potentiometer Replacement Instrumentation: Gain, Offset Adjustment Programmable Voltage to Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching Power Supply Adjustment DIP Switch Setting GENERAL DESCRIPTION The AD5235 provides a dual channel, digitally controlled variable resistor (VR) with resolutions of 1024 positions. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD5235’s versatile programming via a Micro Controller allows multiple modes of operation and adjustment. In the direct program mode a predetermined setting of the RDAC register can be loaded directly from the micro controller. Another key mode of operation allows the RDAC register to be refreshed with the setting previously stored in the EEMEM register. When changes are made to the RDAC register to establish a new wiper position, the value of the setting can be saved into the EEMEM by executing an EEMEM save operation. Once the settings are saved in the EEMEM register, these values will be transferred automatically to the RDAC register to set the wiper position at system power ON. Such operation is enabled by the internal preset strobe and the preset can also be accessed externally. An internal scratch pad RDAC register can be programmed by the micro controller to set the resistance between terminals W-and-B. Once the target value is achieved, the RDAC content register can be placed in the non-volatile memory for automatic recall during Power Up. The AD5235 is available in the thin TSSOP-16 package. All parts are guaranteed to operate over the extended industrial temperature range of -40°C to +85°C. FUNCTIONAL BLOCK DIAGRAMS GND RDAC2 RDAC1 PWR ON PRESET SER I A L IN P U T R E GIST ER RDAC1 REGISTER PR WP CS GND VDD W1 A1 B1 VSS ADDRESS DECO DE RDY CLK EEMEM1 W2 A2 B2 EEMEM2 EEMEM CONTROL RDAC2 REGISTER SDI SDO SPARE EEMEM |
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