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AD8400ARZ1-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD8400ARZ1-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page 1-/2-/4-Channel Digital Potentiometers AD8400/AD8402/AD8403 Rev. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 © 2010 Analog Devices, Inc. All rights reserved. FEATURES 256-position variable resistance device Replaces 1, 2, or 4 potentiometers 1 k Ω, 10 kΩ, 50 kΩ, 100 kΩ Power shutdown—less than 5 μA 3-wire,SPI-compatible serial data input 10 MHz update data loading rate 2.7 V to 5.5 V single-supply operation Qualified for automotive applications APPLICATIONS Mechanical potentiometer replacement Programmable filters, delays, time constants Volume control, panning Line impedance matching Power supply adjustment GENERAL DESCRIPTION The AD8400/AD8402/AD8403 provide a single-, dual-, or quad-channel, 256-position, digitally controlled variable resistor (VR) device.1 These devices perform the same electronic adjust- ment function as a mechanical potentiometer or variable resistor. The AD8400 contains a single variable resistor in the compact SOIC-8 package. The AD8402 contains two independent variable resistors in space-saving SOIC-14 surface-mount packages. The AD8403 contains four independent variable resistors in 24-lead PDIP, SOIC, and TSSOP packages. Each part contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by the digital code loaded into the controlling 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. Each 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 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ has a ±1% channel-to-channel matching tolerance with a nominal temperature coefficient of 500 ppm/°C. A unique switching circuit minimizes the high glitch inherent in traditional switched resistor designs, avoiding any make-before-break or break-before-make operation. (continued on Page 3) 1 The terms digital potentiometer, VR, and RDAC are used interchangeably. FUNCTIONAL BLOCK DIAGRAM 8 8-BIT LATCH CK RS 8 8-BIT LATCH CK RS 8 8-BIT LATCH CK RS 8 8-BIT LATCH CK RS DAC SELECT A1, A0 1 10-BIT SERIAL LATCH CK RS Q D SDO SHDN RS AD8403 VDD DGND SDI CLK CS 8 2 3 2 4 RDAC1 W1 A1 B1 AGND1 RDAC2 W2 A2 B2 AGND2 RDAC3 W3 A3 B3 AGND3 RDAC4 W4 A4 B4 AGND4 SHDN SHDN SHDN SHDN Figure 1. CODE (Decimal) 100 75 50 25 0 0 64 128 192 255 RWA RWB Figure 2. RWA and RWB vs. Code |
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