Overview
The AD8842AR-REEL, produced by Analog Devices Inc., is an 8-bit octal, 4-quadrant multiplying, CMOS TrimDAC. This device provides eight general-purpose digitally controlled voltage adjustment channels, making it an ideal replacement for mechanical trimmers in various applications. The AD8842 is designed for both AC and DC gain control of signals up to 50 kHz bandwidth and features a unique current conveyor amplifier design that enhances its four-quadrant multiplying capability. This design improves constant input resistance performance and eliminates the need for additional input buffer amplifiers. The device is available in 24-pin plastic DIP and surface mount SOL-24 packages and consumes only 95 mW from ±5 V power supplies.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Resolution | 8 bits | - |
| Number of Channels | 8 | - |
| Output Voltage Swing | ±3 V | VDD = +5 V, VSS = –5 V |
| Power Consumption | 95 mW | VDD = +5 V, VSS = –5 V |
| Operating Temperature Range | –40°C to +85°C | - |
| Update Data Loading Rate | 500 kHz | - |
| Four-Quadrant Multiplying Bandwidth | 50 kHz | - |
| Package Types | 24-pin plastic DIP, 24-lead SOIC (Wide) | - |
| Input Clock Pulse Width | 60 ns (tCH, tCL) | - |
| Data Setup Time | 40 ns (tDS) | - |
| Data Hold Time | 20 ns (tDH) | - |
Key Features
- Low cost and replaces up to 8 potentiometers.
- Four-quadrant multiplying capability for signal inversion and modulation.
- Eight individual channels with separate voltage inputs.
- 3-wire serial input interface for easy daisy chaining in multiple DAC applications.
- Midscale preset, zero volts output.
- Improved constant input resistance performance due to the current conveyor amplifier design.
- No need for additional input buffer amplifiers.
Applications
- Automatic adjustment and trimmer replacement in various electronic circuits.
- 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 resolution of the AD8842AR-REEL?
The AD8842AR-REEL has an 8-bit resolution.
- How many channels does the AD8842AR-REEL have?
The device has eight individual channels.
- What is the output voltage swing of the AD8842AR-REEL?
The output voltage swing is ±3 V.
- What is the power consumption of the AD8842AR-REEL?
The device consumes 95 mW from ±5 V power supplies.
- What are the typical applications of the AD8842AR-REEL?
Typical applications include automatic adjustment, trimmer replacement, vertical deflection amplitude adjustment, and waveform generation and modulation.
- What is the four-quadrant multiplying bandwidth of the AD8842AR-REEL?
The four-quadrant multiplying bandwidth is 50 kHz.
- What types of packages are available for the AD8842AR-REEL?
The device is available in 24-pin plastic DIP and 24-lead SOIC (Wide) packages.
- How does the AD8842AR-REEL interface with other devices?
The device uses a 3-wire serial input interface that allows for easy daisy chaining in multiple DAC applications.
- What is the update data loading rate of the AD8842AR-REEL?
The update data loading rate is 500 kHz.
- Does the AD8842AR-REEL require additional input buffer amplifiers?
No, the device does not require additional input buffer amplifiers due to its current conveyor amplifier design.
