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AD5204BN10 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD5204BN10 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 11 page 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. a AD5204/AD5206 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 REV. 0 4-/6-Channel Digital Potentiometers FUNCTIONAL BLOCK DIAGRAMS D7 D0 A1 W1 B1 VDD AD5204 CS CLK 8 EN ADDR DEC A2 A1 A0 SDI DI SER REG D0 D7 A4 W4 B4 GND RDAC LATCH #1 R D7 D0 RDAC LATCH #4 R POWER- ON PRESET VSS SDO DO PR SHDN D7 D0 A1 W1 B1 VDD AD5206 CS CLK 8 EN ADDR DEC A2 A1 A0 SDI DI SER REG D0 D7 A6 W6 B6 GND RDAC LATCH #1 R D7 D0 RDAC LATCH #6 R POWER- ON PRESET VSS FEATURES 256 Position Multiple Independently Programmable Channels AD5204—4-Channel AD5206—6-Channel Potentiometer Replacement 10 k , 50 k , 100 k 3-Wire SPI-Compatible Serial Data Input +2.7 V to +5.5 V Single Supply; 2.7 V Dual Supply Operation Power ON Midscale Preset APPLICATIONS Mechanical Potentiometer Replacement Instrumentation: Gain, Offset Adjustment Programmable Voltage-to-Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching GENERAL DESCRIPTION The AD5204/AD5206 provides four-/six-channel, 256 position digitally-controlled Variable Resistor (VR) devices. These de- vices perform the same electronic adjustment function as a potentiometer or variable resistor. Each channel of the AD5204/ AD5206 contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digital code loaded into the SPI-compatible serial-input register. The resis- tance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the VR latch. The variable resistor offers a completely program- mable 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 10 k Ω, 50 kΩ, or 100 kΩ has a nominal tempera- ture coefficient of 700 ppm/ °C. Each VR has its own VR latch which holds its programmed resistance value. These VR latches are updated from an internal serial-to-parallel shift register that is loaded from a standard 3-wire serial-input digital interface. Eleven data bits make up the data word clocked into the serial input register. The first three bits are decoded to determine which VR latch will be loaded with the last eight bits of the data word when the CS strobe is returned to logic high. A serial data output pin at the opposite end of the serial register (AD5204 only) allows simple daisy-chaining in multiple VR applications without additional external decoding logic. An optional reset ( PR) pin forces all the AD5204 wipers to the midscale position by loading 80H into the VR latch. The AD5204/AD5206 is available in both surface mount (SOL-24), TSSOP-24 and the 24-lead plastic DIP package. All parts are guaranteed to operate over the extended industrial temperature range of –40 °C to +85°C. For additional single, dual, and quad channel devices, see the AD8400/AD8402/ AD8403 products. |
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