Overview
The AD8802ARUZ, produced by Analog Devices Inc., is a 12-channel digital-to-analog converter (DAC) designed to provide independent digitally-controllable voltage outputs. This component is part of the TrimDAC® family, which replaces mechanical trimmer functions in new designs. It is ideal for DC voltage adjustment applications and can be easily programmed via a serial interface using microcontroller ports. The AD8802 features a midscale preset, making it suitable for potentiometer replacement where adjustments start at a nominal value.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Resolution | N | 8 Bits | ||||
| Differential Nonlinearity Error | DNL | –1 | ±1/4 | +1 | LSB | |
| Integral Nonlinearity Error | INL | –1.5 | ±1/2 | +1.5 | LSB | |
| Full-Scale Error | GFSE | –1 | 1/2 | +1 | LSB | |
| Zero Code Error | VZSE | –1 | 1/4 | +1 | LSB | |
| DAC Output Resistance | ROUT | 3 | 5 | 8 | kΩ | |
| Output Resistance Match | ∆R/RO | 1.5 % | ||||
| Reference Input Voltage Range | VREFH | 0 | VDD | V | ||
| Power Dissipation | PDISS | VIH = VDD or VIL = 0 V, VDD = +5.5 V | 55 µW | |||
| Power Supply Sensitivity | PSRR | VDD = +5 V ± 10% | 0.001 | 0.002 | %/% | |
| VOUT Settling Time | tS | ±1/2 LSB Error Band | 0.6 µs |
Key Features
- Low Cost: Replaces 12 potentiometers with a single component.
- Individually Programmable Outputs: Each DAC can be programmed independently.
- 3-Wire SPI Compatible Serial Input: Easy integration with microcontrollers.
- Power Shutdown: Reduces power consumption to less than 55 µW, including IDD and IREF.
- Midscale Preset: Available on the AD8802, ideal for potentiometer replacement starting at a nominal value.
- Separate VREFL Range Setting: Available on the AD8804, allowing for a separate zero-scale voltage setting.
- +3 V to +5 V Single Supply Operation: Flexible power supply options.
Applications
- Automatic Adjustment: Suitable for applications requiring automatic adjustments.
- Trimmer Replacement: Replaces mechanical trimmers in new designs.
- Video and Audio Equipment: Ideal for gain control of video amplifiers, voltage-controlled frequencies, and bandwidths.
- Geometric Correction and Automatic Adjustment: Used in CRT computer graphic displays.
- Portable and Battery Operated Equipment: Low power consumption makes it suitable for battery-operated devices.
Q & A
- What is the AD8802ARUZ used for?
The AD8802ARUZ is used for DC voltage adjustment applications, replacing mechanical trimmers and potentiometers in new designs.
- How many channels does the AD8802ARUZ have?
The AD8802ARUZ has 12 independent digitally-controllable voltage output channels.
- What is the resolution of the AD8802ARUZ?
The AD8802ARUZ has an 8-bit resolution.
- What is the power consumption of the AD8802ARUZ in shutdown mode?
In shutdown mode, the AD8802ARUZ consumes only 10 µA from a 5 V power supply.
- What are the available package options for the AD8802ARUZ?
The AD8802ARUZ is available in 20-pin plastic DIP, SOIC-20 surface mount, and 1 mm thin TSSOP-20 packages.
- How is the AD8802ARUZ programmed?
The AD8802ARUZ is programmed via a 3-wire SPI compatible serial input interface.
- What is the midscale preset feature in the AD8802ARUZ?
The midscale preset feature allows adjustments to start at a nominal value, making it ideal for potentiometer replacement.
- Can the AD8802ARUZ be used in battery-operated devices?
Yes, the low power consumption of the AD8802ARUZ makes it suitable for battery-operated equipment.
- What are some common applications of the AD8802ARUZ?
Common applications include gain control in video amplifiers, voltage-controlled frequencies and bandwidths in video equipment, and geometric correction in CRT computer graphic displays.
- How fast can the AD8802ARUZ load all 12 DACs?
The AD8802ARUZ can load all 12 DACs in as little as 4.6 µs.
