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AD8801AR Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD8801AR Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 page REV. A 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 Octal 8-Bit TrimDAC with Power Shutdown AD8801/AD8803 © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES Low Cost Replaces Eight Potentiometers Eight Individually Programmable Outputs Three-Wire Serial Input Power Shutdown ≤ 25 W Including I DD and IREF Midscale Preset, AD8801 Separate VREFL Range Setting, AD8803 +3 V to +5 V Single Supply Operation APPLICATIONS Automatic Adjustment Trimmer Potentiometer Replacement Video and Audio Equipment Gain and Offset Adjustment Portable and Battery Operated Equipment GENERAL DESCRIPTION The AD8801/AD8803 provides eight digitally controlled dc voltage outputs. This potentiometer divider TrimDAC ® allows replacement of the mechanical trimmer function in new designs. The AD8801/AD8803 is ideal for dc voltage adjustment applications. Easily programmed by serial interfaced microcontroller ports, the AD8801 with its midscale preset is ideal for potentiometer replacement where adjustments start at a nominal value. Appli- cations such as gain control of video amplifiers, voltage con- trolled frequencies and bandwidths in video equipment, geometric correction and automatic adjustment in CRT com- puter graphic displays are a few of the many applications ideally suited for these parts. The AD8803 provides independent con- trol of both the top and bottom end of the potentiometer divider allowing a separate zero-scale voltage setting determined by the VREFL pin. This is helpful for maximizing the resolution of de- vices with a limited allowable voltage control range. FUNCTIONAL BLOCK DIAGRAM (DACs 2–7 Omitted for Clarity) Internally the AD8801/AD8803 contain eight voltage output digital-to-analog converters, sharing a common reference volt- age input. Each DAC has its own DAC register that holds its output state. These DAC registers are updated from an internal serial-to-par- allel shift register that is loaded from a standard three-wire serial input digital interface. Eleven data bits make up the data word clocked into the serial input register. This data word is decoded where the first 3 bits determine the address of the DAC register to be loaded with the last 8 bits of data. The AD8801/AD8803 consumes only 5 µA from 5 V power supplies. In addition, in shutdown mode reference input current consumption is also re- duced to 5 µA while saving the DAC latch settings for use after return to normal operation. The AD8801/AD8803 is available in 16-pin plastic DIP and the 1.5 mm height SO-16 surface mount packages. TrimDAC is a registered trademark of Analog Devices, Inc. DAC 8 VOUT VREFH VREFL . . . . . . AD8801/AD8803 VREFL VREFH O1 O8 SHDN RS CS CLK SDI GND VDD 8 8 8 88 8 3 DAC SELECT 11-BIT SERIAL LATCH D CK RS 1 8 ADDRESS 8-BIT LATCH CK RS 8-BIT LATCH CK RS DAC 1 VOUT VREFH VREFL See the AD8802/AD8804 for a twelve channel version of this product. |
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