Overview
The AD8403AR10, 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 replaces traditional mechanical potentiometers or variable resistors with a digital interface. The AD8403AR10 is housed in a 24-lead SOIC package and offers four independent variable resistors, each with a fixed resistor and a wiper contact that can be programmed via a 3-wire SPI-compatible serial data input.
The device operates over a single-supply voltage range of 2.7 V to 5.5 V and is qualified for extended industrial temperature ranges from -40°C to +125°C. It features a power shutdown mode that reduces current consumption to less than 5 μA, making it suitable for a variety of applications where power efficiency is crucial.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Power Supply Range | VDD | 2.7 | 5.5 | V | ||
| Supply Current (CMOS) | IDD | VIH = VDD or VIL = 0 V | 0.01 | 5 | μA | |
| Supply Current (TTL) | IDD | VIH = 2.4 V or 0.8 V, VDD = 5.5 V | 0.9 | 4 | mA | |
| Power Dissipation (CMOS) | PDISS | VIH = VDD or VIL = 0 V, VDD = 5.5 V | 27.5 | μW | ||
| Fixed A-to-B Terminal Resistance | 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ | |||||
| Channel-to-Channel Matching Tolerance | ±1% | |||||
| Temperature Coefficient | 500 ppm/°C | |||||
| Operating Temperature Range | -40°C | +125°C |
Key Features
- Quad-channel, 256-position digitally controlled variable resistor.
- Available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ fixed resistor values.
- 3-wire SPI-compatible serial data input with a 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 consumption.
- Midscale preset via the reset (RS) pin.
- Extended industrial temperature range of -40°C to +125°C.
- Available in 24-lead PDIP, SOIC, and TSSOP packages.
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 robust design.
Q & A
- What is the AD8403AR10 used for?
The AD8403AR10 is used as a digitally controlled variable resistor, replacing traditional mechanical potentiometers in various applications.
- What are the available resistance values for the AD8403AR10?
The AD8403AR10 is available with fixed resistor values of 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ.
- What is the operating voltage range of the AD8403AR10?
The device operates over a single-supply voltage range of 2.7 V to 5.5 V.
- How many positions can the variable resistor be set to?
The variable resistor can be set to 256 different positions.
- What is the power consumption in shutdown mode?
In shutdown mode, the power consumption is less than 5 μA.
- What is the temperature range for the AD8403AR10?
The device is guaranteed to operate over an extended industrial temperature range of -40°C to +125°C.
- What packages are available for the AD8403AR10?
The AD8403AR10 is available in 24-lead PDIP, SOIC, and TSSOP packages.
- How does the device interface with other components?
The device uses a 3-wire SPI-compatible serial data input interface.
- What is the maximum update rate for the digital code?
The maximum update data loading rate is 10 MHz.
- Can the device be used in automotive applications?
Yes, the AD8403AR10 is qualified for automotive applications due to its robust design and extended temperature range.
