Overview
The AD8803AR, produced by Analog Devices Inc., is an Octal 8-Bit TrimDAC (Digital-to-Analog Converter) with power shutdown and mid-scale preset capabilities. This device is designed to replace mechanical trimmers in various applications, offering a digitally controlled alternative for dc voltage adjustments. The AD8803AR features eight voltage output digital-to-analog converters, each with its own DAC register, sharing a common reference voltage input. It is easily programmable via a standard three-wire serial input digital interface, making it suitable for integration with microcontrollers.
Key Specifications
| Parameter | Value |
|---|---|
| Number of DACs | 8 |
| Resolution | 8 bits |
| Supply Voltage | 2.7V to 5.5V |
| Power Consumption (Active) | 5 mA from 5 V power supplies |
| Power Consumption (Shutdown) | 5 µA |
| Package Types | 16-pin plastic DIP, 16-pin SOIC |
| Serial Interface | Three-wire serial input (CLK, CS, SDI) |
| Settling Time | 0.6 µs |
| Operating Temperature | -40°C to +85°C |
Key Features
- Eight independent 8-bit digital-to-analog converters with a common reference voltage input.
- Low power consumption: 5 mA active, 5 µA in shutdown mode.
- Standard three-wire serial input interface for easy microcontroller integration.
- Mid-scale preset feature for initializing DAC outputs to a nominal value.
- Independent control of the top and bottom end of the potentiometer divider, allowing for separate zero-scale voltage settings.
- Available in 16-pin plastic DIP and SOIC packages.
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 dc voltage adjustment applications.
Q & A
- What is the AD8803AR used for? The AD8803AR is used for dc voltage adjustments and can replace mechanical trimmers in various applications.
- How many DACs does the AD8803AR have? The AD8803AR has eight 8-bit digital-to-analog converters.
- What is the power consumption of the AD8803AR in active and shutdown modes? The AD8803AR consumes 5 mA in active mode and 5 µA in shutdown mode.
- What types of packages is the AD8803AR available in? The AD8803AR is available in 16-pin plastic DIP and 16-pin SOIC packages.
- How is the AD8803AR programmed? The AD8803AR is programmed via a standard three-wire serial input digital interface.
- What is the settling time of the AD8803AR? The settling time of the AD8803AR is 0.6 µs.
- What are some common applications of the AD8803AR? Common applications include gain control of video amplifiers, voltage-controlled frequencies and bandwidths in video equipment, and geometric correction in CRT displays.
- Can the AD8803AR be used in low-power applications? Yes, the AD8803AR is suitable for low-power applications due to its low power consumption in both active and shutdown modes.
- How does the mid-scale preset feature work? The mid-scale preset feature initializes all DAC outputs to a nominal value, which is useful for applications where adjustments start at a specific midpoint.
- Is the AD8803AR compatible with microcontrollers? Yes, the AD8803AR is easily integrated with microcontrollers via its standard three-wire serial input interface.
