Octal 8-Bit TrimDAC With Power Shutdown & Mid-Scale Preset
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 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.
Internally the AD8801 AD8803 contain eight voltage output digital-to-analog converters, sharing a common reference voltage input.
Each DAC has its own DAC Register that holds its output state. These DAC Registers are updated from an internal serial-to-parallel 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 mA from 5 V power supplies. In addition, in shutdown mode reference input current consumption is also reduced to 5 A 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.
By Analog Devices, Inc.
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