Overview
The AD5220BR100-REEL7, produced by Analog Devices Inc., is a single-channel, 128-position digitally controlled variable resistor (VR) device. This component functions as an electronic replacement for potentiometers or variable resistors, offering precise digital control over resistance values. It is optimized for use in instrument and test equipment, particularly in push-button applications. The device features a fixed resistor with a wiper contact that can be positioned at one of 128 points, determined by a digitally controlled UP/DOWN counter.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| End-to-End Resistance | RAB | - | - | 100 kΩ | - | kΩ |
| Number of Positions | - | - | - | 128 | - | - |
| Resistance Step Size | - | - | - | 781.25 Ω (for 100 kΩ) | - | Ω |
| Input Logic High | VIH | VDD = +5 V | - | 2.4 V | - | V |
| Input Logic Low | VIL | VDD = +5 V | - | 0.8 V | - | V |
| Power Supply Range | VDD | - | 2.7 V | 5.5 V | - | V |
| Supply Current | IDD | VIH = +5 V or VIL = 0 V, VDD = +5 V | 15 µA | 40 µA | - | µA |
| Power Dissipation | PDISS | VIH = +5 V or VIL = 0 V, VDD = +5 V | 75 µW | 200 µW | - | µW |
| Resistance Temperature Coefficient | ∆RAB/∆T | VAB = VDD, Wiper = No Connect | - | 800 ppm/°C | - | ppm/°C |
Key Features
- Digital Control: The AD5220BR100-REEL7 features a three-wire serial input interface with clock (CLK), chip select (CS), and UP/DOWN (U/D) control inputs, allowing for precise digital control over the variable resistor settings.
- 128 Positions: The device offers 128 distinct positions for the wiper, providing fine granularity in resistance adjustment.
- Low Power Consumption: With a supply current of 15 µA to 40 µA, this device is very power-efficient, making it suitable for battery-powered applications.
- Multiple Resistance Values: Available in 10 kΩ, 50 kΩ, and 100 kΩ end-to-end resistance configurations.
- Automotive Qualification: Qualified for use in automotive applications, ensuring reliability in harsh environments.
- Simple Interface: The digital interface eliminates the need for microcontrollers in front panel interface designs, simplifying the overall system architecture.
Applications
- Instrument and Test Equipment: Ideal for applications requiring precise resistance adjustments, such as calibration and measurement instruments.
- Automotive Systems: Suitable for use in automotive systems due to its qualification for automotive applications and robust performance in varying temperatures.
- Industrial Control Systems: Can be used in industrial control systems where adjustable resistance is necessary, such as in feedback loops and sensor calibration.
- Medical Devices: Applicable in medical devices that require precise and reliable resistance adjustments.
Q & A
- What is the AD5220BR100-REEL7 used for?
The AD5220BR100-REEL7 is used as a digitally controlled variable resistor, replacing traditional potentiometers in various applications.
- How many positions does the AD5220BR100-REEL7 offer?
The device offers 128 distinct positions for the wiper.
- What are the available end-to-end resistance values for the AD5220BR100-REEL7?
The device is available in 10 kΩ, 50 kΩ, and 100 kΩ configurations.
- What is the power supply range for the AD5220BR100-REEL7?
The power supply range is from 2.7 V to 5.5 V.
- Is the AD5220BR100-REEL7 suitable for automotive applications?
Yes, it is qualified for use in automotive applications.
- How is the wiper position controlled in the AD5220BR100-REEL7?
The wiper position is controlled using a three-wire serial input interface with clock (CLK), chip select (CS), and UP/DOWN (U/D) control inputs.
- What is the typical supply current of the AD5220BR100-REEL7?
The typical supply current is between 15 µA and 40 µA.
- What is the resistance temperature coefficient of the AD5220BR100-REEL7?
The resistance temperature coefficient is 800 ppm/°C.
- Does the AD5220BR100-REEL7 require external debounce circuitry?
Yes, external debounce circuitry is required for the negative-edge sensitive CLK pin.
- In what types of packages is the AD5220BR100-REEL7 available?
The device is available in various packages including SOIC-8 and MSOP-8.
