AD8402ARUZ1

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital Potentiometer
• Characteristics: Dual Channel, 256-Position, Nonvolatile Memory
• Package: 16-Pin TSSOP (Thin Shrink Small Outline Package)
• Essence: Provides a digitally controlled variable resistor function
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Resolution: 8 bits (256 positions)
• Supply Voltage Range: 2.7V to 5.5V
• Temperature Range: -40°C to +125°C
• Interface: Serial Peripheral Interface (SPI)
• End-to-End Resistance Range: 10kΩ, 50kΩ, 100kΩ
• Nonvolatile Memory: Stores wiper position settings
• Power-On Reset: Returns wiper to midscale position on power-up

Pin Configuration

The AD8402ARUZ1 has a 16-pin TSSOP package with the following pin configuration:

1. VDD - Positive supply voltage
2. SDO - Serial Data Output
3. SDI - Serial Data Input
4. SCLK - Serial Clock Input
5. CS - Chip Select Input
6. GND - Ground
7. W1A - Terminal A of Channel 1 Wiper
8. W1B - Terminal B of Channel 1 Wiper
9. W1C - Terminal C of Channel 1 Wiper
10. W2A - Terminal A of Channel 2 Wiper
11. W2B - Terminal B of Channel 2 Wiper
12. W2C - Terminal C of Channel 2 Wiper
13. H/L - High/Low terminal for nonvolatile memory programming
14. NC - No Connection
15. VSS - Negative supply voltage
16. VLOGIC - Logic supply voltage

Functional Features

• Dual-channel digital potentiometer with 256 positions per channel
• Nonvolatile memory to store wiper position settings
• SPI interface for easy digital control
• Power-On Reset feature returns wiper to midscale position on power-up
• Wide supply voltage range allows for versatile applications
• Temperature range suitable for various environments

Advantages and Disadvantages

Advantages: - Provides precise digital control over resistance values - Nonvolatile memory ensures retention of wiper positions - Compact package size for space-constrained designs - Wide supply voltage range allows for compatibility with different systems

Disadvantages: - Limited resolution compared to higher-bit digital potentiometers - Requires an external microcontroller or SPI master for control

Working Principles

The AD8402ARUZ1 is a digital potentiometer that emulates the behavior of a mechanical potentiometer. It consists of two independent channels, each with 256 positions. The resistance between the wiper terminal and either end terminal can be adjusted digitally using the SPI interface.

Upon power-up, the nonvolatile memory stores the last wiper position settings, ensuring that the potentiometer retains its previous state. The Power-On Reset feature automatically returns the wiper to the midscale position, providing a known starting point.

The device operates within a wide supply voltage range and can be controlled by an external microcontroller or any SPI master device.

Detailed Application Field Plans

The AD8402ARUZ1 finds applications in various fields, including:

1. Audio Equipment: Volume control, tone adjustment
2. Industrial Control Systems: Variable gain amplifiers, calibration circuits
3. Test and Measurement Instruments: Programmable signal generators, attenuators
4. Automotive Electronics: Climate control systems, motor control
5. Communication Systems: Signal conditioning, impedance matching

Detailed and Complete Alternative Models

1. AD8400ARZ - Single-channel digital potentiometer with 256 positions
2. AD8403ARUZ - Triple-channel digital potentiometer with 256 positions per channel
3. AD5262BRUZ20 - Dual-channel digital potentiometer with 1024 positions per channel
4. MCP4131-103E/P - Single-channel digital potentiometer with 128 positions
5. MAX5486EUD+T - Dual-channel digital potentiometer with 256 positions per channel

These alternative models offer different features and specifications to suit specific application requirements.

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