Overview
The AD8403AR100-REEL, produced by Analog Devices Inc., is a quad-channel, 256-position digitally controlled variable resistor (VR) device. This component is part of the AD8400/AD8402/AD8403 series, which performs the same electronic adjustment function as a mechanical potentiometer or variable resistor. The AD8403 specifically 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 device is available in 24-lead PDIP, SOIC, and TSSOP packages, making it versatile for various applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Nominal Resistance | RAB | TA = 25°C | 70 | 100 | 130 | kΩ |
| Resistance Tempco | ΔRAB/ΔT | VAB = VDD, Wiper = No Connect | 500 | ppm/°C | ||
| Wiper Resistance | RW | VDD = 5V, IW = VDD/RAB | 50 | 100 | Ω | |
| Wiper Resistance | RW | VDD = 3V, IW = VDD/RAB | 200 | Ω | ||
| Shutdown Current | IA_SD | VA = VDD, VB = 0 V, SHDN = 0 | 0.01 | 5 | µA | |
| Shutdown Wiper Resistance | RW_SD | VA = VDD, VB = 0 V, SHDN = 0, VDD = 5 V | 100 | 200 | Ω | |
| Operating Temperature Range | TA | -40 | +125 | °C |
Key Features
- Quad-channel, 256-position digitally controlled variable resistor.
- Available in 24-lead PDIP, SOIC, and TSSOP packages.
- Fixed resistor values of 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ with ±1% channel-to-channel matching tolerance.
- Nominal temperature coefficient of 500 ppm/°C.
- 3-wire, SPI-compatible serial data input with 10 MHz update data loading rate.
- Single-supply operation from 2.7 V to 5.5 V.
- Power shutdown mode with less than 5 μA current draw.
- Daisy-chaining capability without additional external decoding logic.
- 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 extended temperature range and reliability.
Q & A
- What is the AD8403AR100-REEL used for?
The AD8403AR100-REEL is used as a quad-channel, digitally controlled variable resistor, replacing mechanical potentiometers in various applications.
- What are the available resistor values for the AD8403?
The AD8403 is available with fixed resistor values of 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ.
- What is the temperature coefficient of the AD8403?
The nominal temperature coefficient of the AD8403 is 500 ppm/°C.
- What is the operating voltage range of the AD8403?
The AD8403 operates with a single supply from 2.7 V to 5.5 V.
- How does the power shutdown feature work?
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.
- Can the AD8403 be daisy-chained?
Yes, the AD8403 can be daisy-chained without additional external decoding logic due to its serial data output pin.
- What is the operating temperature range of the AD8403?
The AD8403 is guaranteed to operate over the extended industrial temperature range of -40°C to +125°C.
- What are some common applications of the AD8403?
Common applications include mechanical potentiometer replacement, programmable filters, volume control, line impedance matching, and power supply adjustment.
- Is the AD8403 suitable for automotive applications?
Yes, the AD8403 is qualified for automotive applications due to its extended temperature range and reliability.
- How many positions can the resistance be set to in the AD8403?
The resistance can be set to 256 different positions.
