Overview
The AD8403ARU1, produced by Analog Devices Inc., is a quad-channel, 256-position digitally controlled variable resistor (VR) device. This component performs the same electronic adjustment function as a mechanical potentiometer or variable resistor. It is available in a 24-lead TSSOP package and operates on a single supply voltage ranging from 2.7 V to 5.5 V, making it suitable for battery-powered applications and various other uses.
The device contains four independent variable resistors, each with a fixed resistor and a wiper contact that taps the fixed resistor value based on a digital code loaded into the controlling serial input register. This allows for completely programmable resistance values between the A terminal and the wiper or the B terminal and the wiper.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Nominal Resistance | RAB | TA = 25°C | 0.8 | 1.2 | 1.5 | kΩ |
| Resistance Tempco | ΔRAB/ΔT | VAB = VDD, Wiper = No Connect | 700 | ppm/°C | ||
| Wiper Resistance | RW | VDD = 5V, IW = VDD/RAB | 53 | 100 | Ω | |
| Supply Voltage | VDD | 2.7 | 5.5 | V | ||
| Operating Temperature | TA | -40 | 125 | °C | ||
| Interface | 3-wire SPI-compatible | |||||
| Number of Positions | 256 |
Key Features
- Quad-channel, 256-position digitally controlled variable resistor.
- Single-supply operation from 2.7 V to 5.5 V, suitable for battery-powered applications.
- Available in 24-lead PDIP, SOIC, and TSSOP packages.
- 3-wire SPI-compatible serial data input interface.
- Completely programmable resistance values between the A terminal and the wiper or the B terminal and the wiper.
- ±1% channel-to-channel matching tolerance.
- Nominal temperature coefficient of 500 ppm/°C or 700 ppm/°C depending on the model.
- Low power shutdown current of less than 5 μA.
- Guaranteed operation over the extended industrial temperature range of -40°C to +125°C.
Applications
- Mechanical potentiometer replacement.
- Programmable filters, delays, and time constants.
- Volume control and panning in audio systems.
- Line impedance matching.
- Power supply adjustment.
- Automotive applications due to its robust temperature range and reliability.
Q & A
- What is the AD8403ARU1 used for?
The AD8403ARU1 is used as a digitally controlled variable resistor, replacing mechanical potentiometers in various applications.
- What are the available package types for the AD8403?
The AD8403 is available in 24-lead PDIP, SOIC, and TSSOP packages.
- What is the operating voltage range of the AD8403ARU1?
The operating voltage range is from 2.7 V to 5.5 V.
- How many positions does the AD8403ARU1 have?
The AD8403ARU1 has 256 positions for each of its four variable resistors.
- What is the temperature coefficient of the AD8403ARU1?
The nominal temperature coefficient is 700 ppm/°C.
- What interface does the AD8403ARU1 use for communication?
The AD8403ARU1 uses a 3-wire SPI-compatible serial data input interface.
- What is the power shutdown current of the AD8403ARU1?
The power shutdown current is less than 5 μA.
- What is the operating temperature range of the AD8403ARU1?
The operating temperature range is from -40°C to +125°C.
- Is the AD8403ARU1 suitable for automotive applications?
Yes, it is qualified for automotive applications due to its robust temperature range and reliability.
- What are some common applications of the AD8403ARU1?
Common applications include mechanical potentiometer replacement, programmable filters, volume control, line impedance matching, and power supply adjustment.
