Overview
The AD8842AR, produced by Analog Devices Inc., is an 8-bit octal, 4-quadrant multiplying, CMOS TrimDAC. This integrated circuit is designed to provide eight general-purpose digitally controlled voltage adjustment devices, making it an ideal replacement for mechanical trimmers in various applications. The AD8842AR is particularly useful for ac or dc gain control of signals up to 50 kHz bandwidth and features a four-quadrant multiplying capability, which is beneficial for signal inversion and modulation, especially in video vertical deflection circuitry.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Bits | 8 | |
| Number of D/A Converters | 8 | |
| Settling Time | 5.4 µs | (Typical) |
| Output Type | Voltage | |
| Differential Output | No | |
| INL/DNL | ±0.2, ±0.4 | LSB |
| Data Interface | SPI | |
| Reference Type | External Voltage | |
| Voltage Supply, Analog | ±5 V | |
| Operating Temperature | -40°C to 85°C | |
| Package / Case | 24-SOIC (0.295", 7.50mm Width) | |
| Power Consumption | 95 mW | (from ±5 V power supplies) |
Key Features
- Low cost and replaces up to 8 potentiometers.
- 50 kHz 4-quadrant multiplying bandwidth.
- Low zero output error.
- Eight individual channels with 3-wire serial input.
- 500 kHz update data loading rate.
- ±3 V output swing with midscale preset at zero volts out.
- Internally buffered outputs providing up to 3 mA of output drive current.
- Improved constant input resistance performance using a new current conveyor amplifier design.
Applications
- Automatic adjustment and trimmer replacement.
- Vertical deflection amplitude adjustment in video systems.
- Waveform generation and modulation.
- Ac or dc gain control of signals up to 50 kHz bandwidth.
Q & A
- What is the AD8842AR used for?
The AD8842AR is used for providing eight general-purpose digitally controlled voltage adjustment devices, replacing mechanical trimmers, and for ac or dc gain control of signals up to 50 kHz bandwidth.
- What is the power consumption of the AD8842AR?
The AD8842AR consumes 95 mW from ±5 V power supplies.
- What is the settling time of the AD8842AR?
The settling time of the AD8842AR is typically 5.4 µs.
- What type of output does the AD8842AR provide?
The AD8842AR provides voltage outputs.
- Does the AD8842AR support differential output?
No, the AD8842AR does not support differential output.
- What is the data interface of the AD8842AR?
The data interface of the AD8842AR is SPI (Serial Peripheral Interface).
- What is the operating temperature range of the AD8842AR?
The operating temperature range of the AD8842AR is -40°C to 85°C.
- What package types are available for the AD8842AR?
The AD8842AR is available in 24-pin SOIC (Small Outline Integrated Circuit) packages.
- How many channels does the AD8842AR have?
The AD8842AR has eight individual channels.
- What is the output drive current of the AD8842AR?
The AD8842AR provides up to 3 mA of output drive current.
