Overview
The AD8402AR1-REEL, produced by Analog Devices Inc., is a 2-channel digital potentiometer that offers a digitally controlled variable resistor (VR) device. This component is part of the AD8400/AD8402/AD8403 family, which provides single, dual, or quad-channel configurations. The AD8402 specifically contains two independent variable resistors in a space-saving 14-lead SOIC surface-mount package. These devices perform the same electronic adjustment function as mechanical potentiometers or variable resistors, making them ideal for various applications requiring precise and programmable resistance control.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Nominal Resistance (RAB) | TA = 25°C | 0.8 / 8 / 35 / 70 | 1 / 10 / 50 / 100 | 1.6 / 12 / 65 / 130 | kΩ |
| Resistance Tempco (ΔRAB/ΔT) | VAB = VDD, Wiper = No Connect | - | - | 500 / 700 ppm/°C | - |
| Wiper Resistance (RW) | VDD = 5V, IW = VDD/RAB | - | - | 50 / 100 Ω | - |
| Nominal Resistance Match (ΔR/RAB) | CH 1 to 2, 3, or 4, VAB = VDD, TA = 25°C | - | - | 0.2 / 1 % | - |
| Supply Voltage (VDD) | - | 2.7 | - | 5.5 | V |
| Operating Temperature (TA) | - | -40 | - | 125 | °C |
| Resolution | - | - | - | 256 positions (8 bits) | - |
Key Features
- Dual-Channel Configuration: The AD8402 contains two independent variable resistors, each with 256 programmable positions.
- Programmable Resistance: Each variable resistor offers a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper.
- Low Power Shutdown: Less than 5 μA in power shutdown mode.
- Serial Interface: 3-wire, SPI-compatible serial data input with a 10 MHz update data loading rate.
- Temperature Stability: Nominal temperature coefficient of 500 ppm/°C or 700 ppm/°C depending on the resistance value.
- Glitch-Free Operation: Unique switching circuit minimizes high glitch inherent in traditional switched resistor designs, avoiding make-before-break or break-before-make operations.
Applications
- Mechanical Potentiometer Replacement: Ideal for replacing mechanical potentiometers in various applications.
- Programmable Filters, Delays, Time Constants: Can be used in filter circuits, delay lines, and time constant adjustments.
- Volume Control and Panning: Suitable for audio applications requiring precise volume control and panning.
- Line Impedance Matching: Used for matching impedance in various signal processing applications.
- Power Supply Adjustment: Can be used to adjust power supply voltages and currents.
- Automotive Applications: Qualified for use in automotive environments due to its robust temperature range and reliability.
Q & A
- What is the AD8402AR1-REEL used for?
The AD8402AR1-REEL is a 2-channel digital potentiometer used for applications requiring precise and programmable resistance control, such as mechanical potentiometer replacement, programmable filters, and volume control.
- What are the available resistance values for the AD8402?
The AD8402 is available with nominal resistance values of 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ.
- What is the resolution of the AD8402?
The AD8402 has a resolution of 256 positions (8 bits) for each variable resistor.
- What is the operating temperature range of the AD8402?
The operating temperature range is from -40°C to +125°C.
- What is the supply voltage range for the AD8402?
The supply voltage range is from 2.7 V to 5.5 V.
- Does the AD8402 support SPI communication?
Yes, the AD8402 has a 3-wire, SPI-compatible serial data input.
- What is the power consumption in shutdown mode?
The power consumption in shutdown mode is less than 5 μA.
- Is the AD8402 suitable for automotive applications?
Yes, the AD8402 is qualified for automotive applications due to its robust temperature range and reliability.
- What is the temperature coefficient of the AD8402?
The nominal temperature coefficient is 500 ppm/°C or 700 ppm/°C depending on the resistance value.
- How does the AD8402 minimize glitches?
The AD8402 uses a unique switching circuit that minimizes high glitches inherent in traditional switched resistor designs, avoiding make-before-break or break-before-make operations.
