GENERAL DESCRIPTION

The 12-channel AD8802/AD8804 provides independent digitally controllable voltage outputs in a compact 20-lead package. This potentiometer divider TrimDAC® allows replacement of the mechanical trimmer function in new designs. The AD8802/AD8804 is ideal for dc voltage adjustment applications.

Easily programmed by serial interfaced microcontroller ports, the AD8802 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 AD8804 provides independent control 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 devices with a limited allowable voltage control range.

FEATURES

Low Cost

Replaces 12 Potentiometers

Individually Programmable Outputs

3-Wire SPI Compatible Serial Input

Power Shutdown <55 mWatts Including IDD & IREF

Midscale Preset, AD8802

Separate VREFL Range Setting, AD8804

+3 V to +5 V Single Supply Operation

APPLICATIONS

Automatic Adjustment

Trimmer Replacement

Video and Audio Equipment Gain and Offset Adjustment

Portable and Battery Operated Equipment

AD8804AN属于集成电路（IC） > 数模转换器（DAC）。亚德诺半导体技术有限公司制造生产的AD8804AN数模转换器（DAC）数模转换器（DAC、D/A、D2A 或 D 转 A）可将数字信号转换为缓冲或无缓冲的模拟电压或电流。DAC 架构是否适合特定应用，要取决于分辨率和采样频率。DAC 通常用于音乐播放器，将数字数据流转换为模拟音频流。它们还用于电视和手机，将数字视频数据转换为模拟视频信号，再连接到屏幕驱动器，以显示单色或彩色图像。