Overview
The AD8403ARZ100-REEL, produced by Analog Devices Inc., is a 4-channel digital potentiometer designed for precision control applications. This device is part of the AD8400/AD8402/AD8403 series, which provides single-, dual-, or quad-channel, 256-position, digitally controlled variable resistors. The AD8403 specifically contains four independent variable resistors, each offering a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. This component is housed in a 24-lead SOIC (Wide) package and is suitable for a wide range of applications requiring electronic adjustment functions similar to mechanical potentiometers or variable resistors.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 4 | |
| Number of Positions | 256 | |
| Operating Temperature Range | -40 to +125 | °C |
| Resistance Values | 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ | |
| Resistance Tempco (typ) | 500 | ppm/°C |
| Supply Voltage Range | 2.7 to 5.5 | V |
| Wiper Resistance (VDD = 5V) | 50 to 100 | Ω |
| Wiper Resistance (VDD = 3V) | 200 | Ω |
| Resistor Tolerance (max) | 20% | |
| THD (typ) | -90 | dB |
| Package Type | 24-Lead SOIC (Wide) |
Key Features
- Four independent variable resistors with 256 positions each.
- Programmable resistance values between the A terminal and the wiper or the B terminal and the wiper.
- 3-wire, SPI-compatible serial data input with a 10 MHz update data loading rate.
- Power shutdown feature with less than 5 μA current consumption.
- Operating temperature range of -40°C to +125°C.
- Single-supply operation from 2.7 V to 5.5 V.
- Daisy chaining capability without additional external decoding logic.
- Reset (RS) pin to force the wiper to midscale.
Applications
- Mechanical potentiometer replacement.
- Programmable filters, delays, and time constants.
- Volume control and panning in audio systems.
- Line impedance matching.
- Power supply adjustment.
- Adjustable power supplies.
- Automotive applications.
Q & A
- What is the AD8403ARZ100-REEL used for?
The AD8403ARZ100-REEL is a 4-channel digital potentiometer used for precision control applications, such as adjustable power supplies, audio level control, and mechanical potentiometer replacement.
- How many variable resistors does the AD8403 contain?
The AD8403 contains four independent variable resistors.
- What are the available resistance values for the AD8403?
The available resistance values are 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ.
- What is the operating temperature range of the AD8403?
The operating temperature range is -40°C to +125°C.
- What is the supply voltage range for the AD8403?
The supply voltage range is 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?
- What is the purpose of the reset (RS) pin?
The reset (RS) pin forces the wiper to midscale by loading 80H into the VR latch.
- Is the AD8403 RoHS compliant?
- What package types are available for the AD8403?
The AD8403 is available in 24-lead PDIP, SOIC, and TSSOP packages.
