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AD5204 Datasheet(PDF) 1 Page - Analog Devices |
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AD5204 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 4-/6-Channel Digital Potentiometers AD5204/AD5206 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1999–2010 Analog Devices, Inc. All rights reserved. FEATURES 256 positions Multiple independently programmable channels AD5204—4-channel AD5206—6-channel Potentiometer replacement Terminal resistance of 10 kΩ, 50 kΩ, 100 kΩ 3-wire SPI-compatible serial data input +2.7 V to +5.5 V single-supply operation; ±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 provide 4-/6-channel, 256-position digitally controlled variable resistor (VR) devices. These devices 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 resistance 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 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 10 kΩ, 50 kΩ, or 100 kΩ has a nominal temperature coefficient of 700 ppm/°C. Each VR has its own VR latch that 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 is 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 requiring additional external decoding logic. 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 Figure 1. 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 R D7 D0 RDAC LATCH 6 RDAC LATCH 1 R VSS POWER-ON PRESET Figure 2. An optional reset (PR) pin forces all the AD5204 wipers to the midscale position by loading 0x80 into the VR latch. The AD5204/AD5206 are available in the 24-lead surface- mount SOIC, TSSOP, and PDIP packages. The AD5204 is also available in a 32-lead, 5 mm × 5 mm LFCSP 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 data sheets. |
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