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AD8801:  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 ...More

AD8801:  Octal 8-Bit TrimDAC with Power Shutdown & Mid-Scale Preset

Product 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 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 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.

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  • Low Cost
  • Replaces Eight Potentiometers
  • Eight Individually Programmable Outputs
  • Three-Wire Serial Input
  • Power Shutdown = µW
    Including IDD an IREF
  • Midscale Preset, AD8801
  • Separate VREFLRange Setting, AD8803
  • +3 to +5 Single Supply Operation
  • Resolution (Bits): 8bit
  • DAC Update Rate: 1.7MSPS
  • DAC Settling Time: 600ns
  • # DAC Outputs: 8
  • DAC Type: Voltage Out
  • DAC Input Format: Ser,SPI
  • Output FSR: (Uni Vdd),(Uni Vref)
  • Ref Int/Ext: Ext
  • Supply Vnom: Single(+3),Single(+3.3),Single(+5)
  • Pwr Diss: 20mW
  • Package: DIP,SOIC

Functional Block Diagram for AD8801

AD8801 Diagram
Functional Block Diagram for AD8801

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Part# Bits Update Rate Settling Time # Outputs
AD8803 8 1.7MSPS 600ns 8
AD8801 8 1.7MSPS 600ns 8
AD8802 8 1.7MSPS 600ns 12
AD8804 8 1.7MSPS 600ns 12
AD7568 12 2MSPS 500ns 8
ADV7129 8 360MSPS 25ns 3
ADV7120 8 80MSPS 12ns 3
AD5428 8 21.3MSPS 30ns 2
AD5429 8 2.47MSPS 30ns 2
AD7628 8 2.9MSPS 350ns 2
AD9709 8 125MSPS 35ns 2
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.