Overview
The AD8402AR10 from Analog Devices Inc. is a dual-channel digital potentiometer designed to provide adjustable resistance values in electronic circuits. This device is part of the AD8400/AD8402/AD8403 series, which offers single-, dual-, or quad-channel configurations. The AD8402AR10 specifically contains two independent variable resistors, each with 256-position resolution, making it suitable for applications requiring precise and programmable resistance adjustments.
The device operates within a single-supply voltage range of 2.7 V to 5.5 V and is compatible with 3-wire SPI interfaces, allowing for easy integration with microcontrollers or other digital control units. It is also qualified for automotive applications and operates over an extended industrial temperature range of −40°C to +125°C.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Number of Circuits | - | - | 2 | - | - | - |
| Number of Taps | - | - | 256 | - | - | - |
| Resistance (Ohms) | RAB | TA = 25°C | 8 | 10 | 12 | kΩ |
| Temperature Coefficient | ΔRAB/ΔT | VAB = VDD, Wiper = No Connect | - | 500 | - | ppm/°C |
| Wiper Resistance | RW | VDD = 5V, IW = VDD/RAB | 50 | 100 | - | Ω |
| Supply Voltage Range | VDD | - | 2.7 | - | 5.5 | V |
| Supply Current (CMOS) | IDD | VIH = VDD or VIL = 0 V | 0.01 | - | 5 | μA |
| Operating Temperature Range | TA | - | -40 | - | 125 | °C |
| Package Type | - | - | - | - | - | 14-SOIC |
Key Features
- 256-position resolution for each 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
- Single-supply operation from 2.7 V to 5.5 V
- Low power shutdown current of less than 5 μA
- Extended industrial temperature range of −40°C to +125°C
- Qualified for automotive applications
- Linear taper and midscale preset
Applications
- Mechanical potentiometer replacement
- Programmable filters, delays, and time constants
- Volume control and panning in audio equipment
- Line impedance matching
- Power supply adjustment
Q & A
- What is the AD8402AR10 used for?
The AD8402AR10 is a dual-channel digital potentiometer used for adjustable resistance values in electronic circuits, replacing mechanical potentiometers and providing precise resistance adjustments.
- What is the resolution of the AD8402AR10?
The AD8402AR10 has a 256-position resolution for each variable resistor.
- What are the available resistance values for the AD8402AR10?
The AD8402AR10 is available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistance values.
- What is the operating voltage range of the AD8402AR10?
The AD8402AR10 operates within a single-supply voltage range of 2.7 V to 5.5 V.
- How does the AD8402AR10 communicate with other devices?
The AD8402AR10 uses a 3-wire SPI-compatible serial data input for communication.
- What is the temperature coefficient of the AD8402AR10?
The temperature coefficient of the AD8402AR10 is 500 ppm/°C.
- What is the typical wiper resistance of the AD8402AR10?
The typical wiper resistance of the AD8402AR10 is 100 Ω when VDD = 5V.
- What is the power shutdown current of the AD8402AR10?
The power shutdown current of the AD8402AR10 is less than 5 μA.
- Is the AD8402AR10 suitable for automotive applications?
Yes, the AD8402AR10 is qualified for automotive applications.
- What is the operating temperature range of the AD8402AR10?
The AD8402AR10 operates over an extended industrial temperature range of −40°C to +125°C.
