Overview
The AD8400AR50, produced by Analog Devices Inc., is a single-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 housed in a compact 8-lead SOIC package and operates over a single-supply voltage range of 2.7 V to 5.5 V. The device features a 3-wire SPI-compatible serial data input and supports a high update data loading rate of 10 MHz. The AD8400AR50 is designed for applications requiring precise digital control over resistance, offering a fully programmable resistance value between the A terminal and the wiper or the B terminal and the wiper.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Resistance Value | RAB | TA = 25°C | 35 | 50 | 65 | kΩ |
| Temperature Coefficient | ΔRAB/ΔT | VAB = VDD, Wiper = No Connect | 500 | ppm/°C | ||
| Supply Voltage Range | VDD | 2.7 | 5.5 | V | ||
| Supply Current (CMOS) | IDD | VIH = VDD or VIL = 0 V | 0.01 | 5 | μA | |
| Power Dissipation (CMOS) | PDISS | VIH = VDD or VIL = 0 V, VDD = 5.5 V | 27.5 | μW | ||
| Operating Temperature Range | TA | -40 | 125 | °C | ||
| Input Logic High | VIH | VDD = 5 V | 2.4 | V | ||
| Input Logic Low | VIL | VDD = 5 V | 0.8 | V |
Key Features
- Single-channel, 256-position digitally controlled variable resistor.
- Available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistance values.
- 3-wire SPI-compatible serial data input with a 10 MHz update data loading rate.
- Power shutdown feature with less than 5 μA current draw.
- Operating voltage range of 2.7 V to 5.5 V.
- Compact 8-lead SOIC package.
- Operating temperature range of -40°C to +125°C.
- Midscale preset and reset functionality.
- Low power dissipation and high accuracy.
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 industrial temperature range.
Q & A
- What is the primary function of the AD8400AR50?
The AD8400AR50 is a digitally controlled variable resistor that performs the same electronic adjustment function as a mechanical potentiometer or variable resistor.
- What are the available resistance values for the AD8400 series?
The AD8400 series is available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistance values.
- What is the operating voltage range of the AD8400AR50?
The operating voltage range is from 2.7 V to 5.5 V.
- What is the power shutdown current of the AD8400AR50?
The power shutdown current is less than 5 μA.
- What is the temperature coefficient of the AD8400AR50?
The temperature coefficient is 500 ppm/°C.
- What is the update data loading rate of the AD8400AR50?
The update data loading rate is 10 MHz.
- What package types are available for the AD8400AR50?
The AD8400AR50 is available in an 8-lead SOIC package.
- What is the operating temperature range of the AD8400AR50?
The operating temperature range is from -40°C to +125°C.
- Does the AD8400AR50 support SPI communication?
Yes, it supports 3-wire SPI-compatible serial data input.
- What are some common applications of the AD8400AR50?
Common applications include mechanical potentiometer replacement, programmable filters, volume control, line impedance matching, and power supply adjustment.
