Overview
The AD8402AR1, produced by Analog Devices Inc., is a dual-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 available in a compact SO-14 surface-mount package, making it suitable for space-saving designs. The AD8402AR1 operates over a wide supply voltage range of 2.7 V to 5.5 V and is guaranteed to function across the extended industrial temperature range of −40°C to +125°C.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Nominal Resistance | RAB | TA = 25°C | 0.8 | 1.2 | 1.5 | kΩ |
| Resistance Tempco | ΔRAB/ΔT | VAB = VDD, Wiper = No Connect | 700 | ppm/°C | ||
| Wiper Resistance | RW | VDD = 5V, IW = VDD/RAB | 53 | 100 | Ω | |
| Supply Voltage Range | VDD | 2.7 | 5.5 | V | ||
| Operating Temperature Range | TA | -40 | 125 | °C | ||
| Bandwidth (-3 dB) | BW_10K | R = 10 kΩ | 600 | kHz | ||
| Total Harmonic Distortion | THDW | VA = 1 V rms + 2 V dc, VB = 2 V dc, f = 1 kHz | 0.003 | % |
Key Features
- 256-position variable resistance device, allowing for precise digital control over the resistance value.
- Replaces mechanical potentiometers, offering programmable resistance values between the A terminal and the wiper or the B terminal and the wiper.
- Available in a compact SO-14 surface-mount package, suitable for space-saving designs.
- 3-wire, SPI-compatible serial data input for easy integration into digital systems.
- Power shutdown feature with less than 5 μA current consumption.
- Operating supply voltage range of 2.7 V to 5.5 V, making it versatile for various applications.
- Guaranteed operation over the extended industrial temperature range of −40°C to +125°C.
Applications
- Mechanical potentiometer replacement in various circuits.
- Programmable filters, delays, and time constants.
- Volume control and panning in audio systems.
- Line impedance matching and power supply adjustment.
- Automotive applications due to its robust temperature range and reliability.
Q & A
- What is the AD8402AR1 used for?
The AD8402AR1 is used as a dual-channel, 256-position digitally controlled variable resistor, replacing mechanical potentiometers in various applications.
- What are the available resistance values for the AD8402AR1?
The AD8402AR1 offers fixed A-to-B terminal resistances of 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ.
- What is the operating temperature range of the AD8402AR1?
The AD8402AR1 operates over the extended industrial temperature range of −40°C to +125°C.
- What is the supply voltage range for the AD8402AR1?
The supply voltage range for the AD8402AR1 is 2.7 V to 5.5 V.
- How many positions of resistance does the AD8402AR1 offer?
The AD8402AR1 offers 256 positions of resistance for each channel.
- What interface does the AD8402AR1 use for digital control?
The AD8402AR1 uses a 3-wire, SPI-compatible serial data input for digital control.
- What is the typical wiper resistance of the AD8402AR1?
The typical wiper resistance of the AD8402AR1 is 100 Ω when VDD = 5V and IW = VDD/RAB.
- What are some common applications of the AD8402AR1?
Common applications include mechanical potentiometer replacement, programmable filters, volume control, line impedance matching, and power supply adjustment.
- Is the AD8402AR1 suitable for automotive applications?
Yes, the AD8402AR1 is qualified for automotive applications due to its robust temperature range and reliability.
- What is the bandwidth of the AD8402AR1?
The bandwidth of the AD8402AR1 is 600 kHz for a 10 kΩ resistance configuration.[
