Overview
The AD8402AR100, produced by Analog Devices Inc., is a 2-channel digital potentiometer that offers a digitally controlled variable resistor (VR) function. This device is part of the AD8400/AD8402/AD8403 series, which replaces traditional mechanical potentiometers with a more precise and programmable electronic solution. The AD8402 specifically contains two independent variable resistors, each with 256 programmable positions, allowing for fine-tuned adjustments in various applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Nominal Resistance | RAB | TA = 25°C, Model: AD840XYY100 | 70 | 100 | 130 | kΩ |
| Resistance Tempco | ΔRAB/ΔT | VAB = VDD, Wiper = No Connect | 500 ppm/°C | |||
| Wiper Resistance | RW | VDD = 5V, IW = VDD/RAB | 50 | 100 | Ω | |
| Wiper Resistance | RW | VDD = 3V, IW = VDD/RAB | 200 | Ω | ||
| Supply Voltage | VDD | 2.7 | 5.5 | V | ||
| Operating Temperature | TA | -40 | 125 | °C | ||
| Power Shutdown Current | < 5 μA |
Key Features
- 256-position digitally controlled variable resistor (VR) with 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ nominal resistance.
- 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.
- Power shutdown mode with less than 5 μA current consumption.
- Midscale preset and reset functionality.
- Available in various packages including SOIC-14, PDIP-14, and TSSOP-14 for different application needs.
- Guaranteed operation over an extended industrial temperature range of -40°C to +125°C.
Applications
- Mechanical potentiometer replacement.
- Programmable filters, delays, and time constants.
- Volume control and panning.
- Line impedance matching.
- Power supply adjustment.
Q & A
- What is the AD8402AR100 used for?
The AD8402AR100 is a 2-channel digital potentiometer used to replace mechanical potentiometers in various applications, offering precise and programmable resistance adjustments.
- What are the available resistance values for the AD8402AR100?
The AD8402AR100 is available with nominal resistance values of 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ.
- What is the operating temperature range of the AD8402AR100?
The device operates over an extended industrial temperature range of -40°C to +125°C.
- How does the power shutdown feature work?
The power shutdown mode 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.
- What is the supply voltage range for the AD8402AR100?
The device operates with a single supply voltage from 2.7 V to 5.5 V.
- What is the update data loading rate for the AD8402AR100?
The device has a 10 MHz update data loading rate.
- What communication interface does the AD8402AR100 use?
The device uses a 3-wire SPI-compatible serial data input interface.
- What packages are available for the AD8402AR100?
The device is available in SOIC-14, PDIP-14, and TSSOP-14 packages.
- How many programmable positions does each variable resistor have?
Each variable resistor has 256 programmable positions.
- What is the typical wiper resistance of the AD8402AR100?
The typical wiper resistance is 50 Ω at VDD = 5V and 200 Ω at VDD = 3V.
