Overview
The AD8403ARU1-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 replaces traditional mechanical potentiometers or variable resistors with digital control. 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 operates over an extended industrial temperature range of −40°C to +125°C and is available in 24-lead PDIP, SOIC, and TSSOP packages.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Nominal Resistance | RAB | TA = 25°C | 0.8 / 8 / 35 / 70 | 1.2 / 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 |
| Power Shutdown Current | - | - | - | - | < 5 | μA |
| Update Data Loading Rate | - | - | - | - | 10 | MHz |
Key Features
- 256-position digitally controlled variable resistor
- Replaces 1, 2, or 4 mechanical potentiometers
- Available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistance options
- Power shutdown current less than 5 μA
- 3-wire SPI-compatible serial data input
- 10 MHz update data loading rate
- 2.7 V to 5.5 V single-supply operation
- Midscale preset
- 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, time constants
- Volume control, panning
- Line impedance matching
- Power supply adjustment
Q & A
- What is the AD8403ARU1-REEL used for?
The AD8403ARU1-REEL is used as a quad-channel, 256-position digitally controlled variable resistor, replacing traditional mechanical potentiometers or variable resistors.
- What are the available resistance options for the AD8403?
The AD8403 is available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistance options.
- What is the operating temperature range of the AD8403?
The AD8403 operates over an extended industrial temperature range of −40°C to +125°C.
- What is the power shutdown current of the AD8403?
The power shutdown current of the AD8403 is less than 5 μA.
- What is the update data loading rate of the AD8403?
The update data loading rate of the AD8403 is 10 MHz.
- What are the package options for the AD8403?
The AD8403 is available in 24-lead PDIP, SOIC, and TSSOP packages.
- How does the AD8403 control the resistance?
The resistance is controlled by a digital code loaded into the controlling serial input register, which determines the position of the wiper contact on the fixed resistor.
- What are some common applications of the AD8403?
Common applications include mechanical potentiometer replacement, programmable filters, delays, time constants, volume control, panning, line impedance matching, and power supply adjustment.
- What is the supply voltage range for the AD8403?
The supply voltage range for the AD8403 is 2.7 V to 5.5 V.
- Is the AD8403 compatible with SPI communication?
Yes, the AD8403 has a 3-wire SPI-compatible serial data input.
