Overview
The AD8804AR, produced by Analog Devices Inc., is a 12-channel, 8-bit TrimDAC (digitally controlled potentiometer) integrated circuit. This component is designed to provide independent digitally controllable voltage outputs in a compact 20-lead package. It is ideal for replacing mechanical trimmers in various applications, offering precise digital control over voltage outputs. The AD8804AR is particularly useful in applications requiring multiple voltage adjustments, such as gain control, offset adjustment, and automatic trimming in electronic equipment.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 12 |
| Number of Bits | 8 |
| Package Type | 20-SOIC (0.295", 7.50mm Width) |
| Supply Voltage (Analog/Digital) | 2.7 V ~ 5.5 V |
| Output Type | Voltage - Unbuffered |
| Differential Output | No |
| Data Interface | SPI (3-wire) |
| Reference Type | External |
| Settling Time | 600 ns (Typ) |
| INL/DNL (LSB) | ±0.5, ±0.25 |
| Architecture | R-2R |
| Operating Temperature | -40°C ~ 85°C |
Key Features
- Low Cost: Replaces up to 12 mechanical potentiometers.
- Individually Programmable Outputs: Each channel can be programmed independently.
- 3-Wire SPI Compatible Serial Input: Easy integration with microcontrollers.
- Power Shutdown: Low power consumption (<55 μW including IDD & IREF).
- Midscale Preset (AD8802): Useful for applications where adjustments start at a nominal value.
- Separate VREFL Range Setting (AD8804): Allows for a separate zero-scale voltage setting.
- Single Supply Operation: Compatible with +3 V to +5 V supply voltage.
Applications
- Automatic Adjustment: Ideal for applications requiring automatic voltage adjustments.
- Trimmer Replacement: Replaces mechanical trimmers in new designs.
- Video and Audio Equipment: Used in gain control, voltage-controlled frequencies, and bandwidth adjustments.
- Portable and Battery Operated Equipment: Suitable due to low power consumption.
- Geometric Correction and Automatic Adjustment in CRT Computer Graphic Displays.
Q & A
- What is the AD8804AR used for?
The AD8804AR is used for providing independent digitally controllable voltage outputs, replacing mechanical trimmers, and is ideal for applications such as gain control, offset adjustment, and automatic trimming.
- How many channels does the AD8804AR have?
The AD8804AR has 12 channels.
- What is the resolution of the AD8804AR?
The AD8804AR has an 8-bit resolution.
- What type of package does the AD8804AR come in?
The AD8804AR comes in a 20-SOIC package.
- What is the supply voltage range for the AD8804AR?
The supply voltage range for the AD8804AR is 2.7 V to 5.5 V.
- What type of data interface does the AD8804AR use?
The AD8804AR uses a 3-wire SPI interface.
- What is the settling time of the AD8804AR?
The settling time of the AD8804AR is typically 600 ns.
- Does the AD8804AR support differential output?
No, the AD8804AR does not support differential output.
- What is the operating temperature range of the AD8804AR?
The operating temperature range of the AD8804AR is -40°C to 85°C.
- What are some common applications of the AD8804AR?
Common applications include automatic adjustment, trimmer replacement, video and audio equipment, and portable and battery-operated equipment.
