AD8801

a FEATURES Low Cost Replaces Eight Potentiometers Eight Individually Programmable Outputs Three-Wire Serial Input Power Shutdown ≤ 25 ␮W Including IDD and IREF Midscale Preset, AD8801 Separate V REFL 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 SDI CLK CS VDD GND Octal 8-Bit TrimDAC with Power Shutdown AD8801/AD8803 FUNCTIONAL BLOCK DIAGRAM (DACs 2–7 Omitted for Clarity) VREFH VREFL AD8801/AD8803 8 8-BIT LATCH CK RS VREFH DAC 1 VOUT VREFL 8 O1 DAC SELECT 1 8 ADDRESS 3 11-BIT SERIAL 8 LATCH D CK RS 8 8-BIT 8 LATCH CK RS . . . . . . VREFH DAC 8 VOUT VREFL 8 O8 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. Applications such as gain control of video amplifiers, voltage controlled frequencies and bandwidths in video equipment, geometric correction and automatic adjustment in CRT computer graphic displays are a few of the many applications ideally suited for these parts. The AD8803 provides independent co...