Overview
The AD8801, produced by Analog Devices Inc., is an octal 8-bit TrimDAC (digitally controlled potentiometer) with power shutdown and mid-scale preset capabilities. This component is designed to replace mechanical trimmers in new designs, offering precise digital control over eight dc voltage outputs. It is ideal for applications requiring adjustable dc voltage settings, such as gain control in video amplifiers, voltage-controlled frequencies and bandwidths in video equipment, and geometric correction in CRT computer graphic displays.
Key Specifications
| Parameter | Value |
|---|---|
| Number of DACs | 8 |
| Resolution | 8 bits |
| Power Supply Range | 2.7 V to 5.5 V |
| Supply Current (CMOS) | 0.01 mA to 5 mA |
| Shutdown Current | 5 µA |
| Reference Input Voltage Range | 0 V to VDD |
| Input Resistance (RREFH) | 2 kΩ |
| Logic High (VIH) at VDD = +5 V | 2.4 V |
| Logic Low (VIL) at VDD = +5 V | 0.8 V |
| Package Types | 16-pin plastic DIP, 16-pin SOIC |
Key Features
- 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.
- Standard three-wire serial input digital interface for programming.
- Eleven data bits make up the data word, with the first 3 bits determining the address of the DAC register.
- Mid-scale preset capability for easy initialization.
- Power shutdown mode with reduced current consumption.
- Compact 16-pin packages (DIP and SOIC).
Applications
- Gain control of video amplifiers.
- Voltage-controlled frequencies and bandwidths in video equipment.
- Geometric correction and automatic adjustment in CRT computer graphic displays.
- Replacement of mechanical trimmers in various electronic designs.
Q & A
- What is the AD8801 used for? The AD8801 is used for dc voltage adjustment applications, replacing mechanical trimmers in new designs.
- How many DACs does the AD8801 contain? The AD8801 contains eight voltage output digital-to-analog converters.
- What is the resolution of each DAC? Each DAC has an 8-bit resolution.
- What is the power supply range for the AD8801? The power supply range is from 2.7 V to 5.5 V.
- How much current does the AD8801 consume in shutdown mode? The AD8801 consumes 5 µA in shutdown mode.
- What is the mid-scale preset feature? The mid-scale preset feature allows all DAC latches to be loaded with 80H, setting the outputs to mid-scale.
- How is the AD8801 programmed? The AD8801 is programmed through a standard three-wire serial input digital interface.
- What are the package options for the AD8801? The AD8801 is available in 16-pin plastic DIP and 16-pin SOIC packages.
- Does the AD8801 support independent control of the potentiometer divider? The AD8803 variant provides independent control of both the top and bottom end of the potentiometer divider.
- What is the typical supply current for the AD8801? The typical supply current is between 0.01 mA and 5 mA.
