Overview
The AD8804ARU, produced by Analog Devices Inc., is a 12-channel, 8-bit TrimDAC (digital-to-analog converter) designed to provide independent digitally-controllable voltage outputs. This component is housed in a compact 20-lead TSSOP package and is ideal for DC voltage adjustment applications. It replaces the mechanical trimmer function in new designs, making it suitable for various electronic systems that require precise voltage control.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Number of Channels | 12 | |
| Resolution | 8-bit | |
| Supply Voltage | +3 V to +5 V | |
| Power Consumption (Active) | < 55 μW (including IDD & IREF) | VDD = +3 V or +5 V |
| Power Consumption (Shutdown) | 10 μA | VDD = +5 V |
| Reference Voltage Input | VREFH = +VDD, VREFL = 0 V to VDD | |
| Operating Temperature | –40°C to +85°C | |
| Package Type | 20-lead TSSOP |
Key Features
- Low cost and compact design, replacing up to 12 potentiometers.
- Individually programmable outputs.
- 3-wire SPI compatible serial input interface.
- Power shutdown feature with low power consumption.
- Midscale preset for AD8802 models.
- Separate VREFL range setting for AD8804 models, allowing independent control of the potentiometer divider.
Applications
- Automatic adjustment and trimmer replacement in various electronic systems.
- Gain control of video amplifiers and audio equipment.
- Voltage-controlled frequencies and bandwidths in video equipment.
- Geometric correction and automatic adjustment in CRT computer graphic displays.
- Portable and battery-operated equipment requiring precise voltage control.
Q & A
- What is the primary function of the AD8804ARU?
The AD8804ARU is a 12-channel, 8-bit TrimDAC designed to provide independent digitally-controllable voltage outputs, replacing mechanical trimmers in electronic systems.
- What are the available supply voltage ranges for the AD8804ARU?
The AD8804ARU operates with a supply voltage range of +3 V to +5 V.
- How many channels does the AD8804ARU have?
The AD8804ARU has 12 independent channels.
- What is the resolution of the AD8804ARU?
The resolution of the AD8804ARU is 8 bits.
- What is the power consumption of the AD8804ARU in active mode?
The power consumption is less than 55 μW, including IDD and IREF.
- How does the power shutdown feature work?
In shutdown mode, the power consumption is reduced to 10 μA, while the DAC latch settings are saved for use after returning to normal operation.
- What types of packages are available for the AD8804ARU?
The AD8804ARU is available in 20-lead TSSOP, PDIP, and SOIC packages.
- What are some common applications of the AD8804ARU?
Common applications include gain control in video and audio equipment, voltage-controlled frequencies and bandwidths, geometric correction in CRT displays, and portable battery-operated devices.
- How is the AD8804ARU programmed?
The AD8804ARU is easily programmed using a 3-wire SPI compatible serial input interface connected to a microcontroller.
- What is the significance of the VREFL pin in the AD8804ARU?
The VREFL pin allows for a separate zero-scale voltage setting, which is helpful for maximizing the resolution of devices with limited allowable voltage control ranges.
