Overview
The AD8842ARZ, manufactured 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 new designs. The AD8842 is particularly useful for AC or DC gain control of signals up to 50 kHz bandwidth and is beneficial in applications requiring signal inversion and modulation, such as video vertical deflection circuitry.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Bits | 8 |
| Number of D/A Converters | 8 |
| Settling Time | 5.4µs (Typ) |
| Output Type | Voltage - Buffered |
| Differential Output | No |
| Data Interface | SPI |
| Reference Type | External |
| Voltage - Supply, Analog | ±5V |
| INL/DNL (LSB) | ±0.2, ±0.4 |
| Architecture | R-2R |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 24-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Power Consumption | 95 mW from ±5 V power supplies |
Key Features
- Low cost and replaces up to eight potentiometers.
- 50 kHz 4-quadrant multiplying bandwidth.
- Low zero output error.
- Eight individual channels with separate voltage inputs.
- 3-wire serial input interface.
- 500 kHz update data loading rate.
- ±3 V output swing with midscale preset at zero volts.
- Current conveyor amplifier design for improved constant input resistance.
- No need for additional input buffer amplifiers.
- Supports daisy chaining for multiple DAC applications.
Applications
- Automatic adjustment and trimmer replacement.
- Vertical deflection amplitude adjustment in video systems.
- Waveform generation and modulation.
- AC or DC gain control of up to 50 kHz bandwidth signals.
Q & A
- What is the AD8842ARZ used for?
The AD8842ARZ is used for providing eight general-purpose digitally controlled voltage adjustment channels, replacing mechanical trimmers, and controlling AC or DC gain in various applications.
- How many D/A converters does the AD8842ARZ have?
The AD8842ARZ has eight D/A converters.
- What is the settling time of the AD8842ARZ?
The settling time of the AD8842ARZ is 5.4µs (Typ).
- What type of data interface does the AD8842ARZ use?
The AD8842ARZ uses a 3-wire SPI data interface.
- What is the operating temperature range of the AD8842ARZ?
The operating temperature range of the AD8842ARZ is -40°C to 85°C.
- What is the power consumption of the AD8842ARZ?
The AD8842ARZ consumes 95 mW from ±5 V power supplies.
- Can the AD8842ARZ be used in single 5 V supply applications?
No, for single 5 V supply applications, the DAC-8841 should be consulted instead.
- Is the AD8842ARZ pin compatible with other DAC models?
Yes, the AD8842ARZ is pin compatible with the DAC8840.
- What package types are available for the AD8842ARZ?
The AD8842ARZ is available in 24-pin plastic DIP and surface mount SOIC packages.
- Can the AD8842ARZ be daisy-chained for multiple DAC applications?
Yes, the AD8842ARZ supports daisy chaining for multiple DAC applications without additional external decoding logic.
- What is the typical output swing of the AD8842ARZ?
The typical output swing of the AD8842ARZ is ±3 V with a midscale preset at zero volts.
