Overview
The AD8402ARZ50-REEL is a dual-channel digital potentiometer manufactured by Analog Devices Inc. This device is part of the AD8400/AD8402/AD8403 family, which provides single-, dual-, or quad-channel, 256-position, digitally controlled variable resistors. The AD8402 specifically contains two independent variable resistors in a compact 14-pin SOIC surface-mount package. It is designed to replace mechanical potentiometers and variable resistors, offering precise digital control over resistance values.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 2 | |
| Number of Positions | 256 | |
| Resistance Value | 50 kΩ | |
| Resistance Tolerance | ±30% | |
| Temperature Coefficient | 500 ppm/°C | |
| Memory Type | Volatile | |
| Interface | 3-wire, SPI-compatible | |
| Supply Voltage | 2.7 V to 5.5 V | |
| Operating Temperature | -40 °C to 125 °C | |
| Package Type | 14-pin SOIC | |
| Package Dimensions | 4 mm (width) x 8.75 mm (length) x 1.5 mm (height) |
Key Features
- 256-position variable resistance with linear taper.
- Single power supply operation from 2.7 V to 5.5 V.
- 3-wire, SPI-compatible serial data input with a 10 MHz update data loading rate.
- Power shutdown feature with less than 5 μA current consumption.
- Reset pin to force the wiper to midscale.
- Simple daisy chaining in multiple VR applications without additional external decoding logic.
- Volatile memory; settings are lost when power is turned off.
Applications
- Mechanical potentiometer replacement.
- Programmable filters, delays, and time constants.
- Volume control and panning in audio systems.
- Line impedance matching.
- Power supply adjustment.
Q & A
- What is the AD8402ARZ50-REEL used for?
The AD8402ARZ50-REEL is used as a dual-channel digital potentiometer to replace mechanical potentiometers and variable resistors in various electronic applications.
- How many positions does the AD8402ARZ50-REEL have?
The AD8402ARZ50-REEL has 256 positions for each of its two independent variable resistors.
- What is the resistance value of the AD8402ARZ50-REEL?
The resistance value of the AD8402ARZ50-REEL is 50 kΩ.
- What is the operating temperature range of the AD8402ARZ50-REEL?
The operating temperature range is from -40 °C to 125 °C.
- What type of interface does the AD8402ARZ50-REEL use?
The AD8402ARZ50-REEL uses a 3-wire, SPI-compatible serial data input interface.
- What is the power shutdown feature of the AD8402ARZ50-REEL?
The power shutdown feature forces the resistor to an end-to-end open-circuit condition on the A terminal and shorts the wiper to the B terminal, achieving a microwatt power shutdown state.
- What is the package type of the AD8402ARZ50-REEL?
The package type is a 14-pin SOIC (Small Outline Integrated Circuit).
- Is the AD8402ARZ50-REEL suitable for automotive applications?
No, the AD8402ARZ50-REEL is not specifically qualified for automotive applications, although it has a wide operating temperature range and other robust features.
- How does the reset pin function on the AD8402ARZ50-REEL?
The reset pin forces the wiper to midscale by loading 80H into the VR latch.
- Can multiple AD8402ARZ50-REEL devices be daisy-chained?
