Overview
The AD5220BRZ100, 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 mechanical potentiometers and 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 operates over an extended industrial temperature range of -40°C to +85°C and is available in various package types, including SO-8, 8-lead plastic DIP, and thin μSOIC packages.
Key Specifications
| Parameter | Symbol | Conditions | Min | |||
|---|---|---|---|---|---|---|
| Resistor Differential Nonlinearity | R-DNL | RWB, VA = NC, RAB = 10 kΩ | -1 | ±0.4 | +1 | LSB |
| Resistor Integral Nonlinearity | R-INL | RWB, VA = NC, RAB = 10 kΩ | -1 | ±0.5 | +1 | LSB |
| Nominal Resistor Tolerance | ∆R | TA = +25°C | -30 | +30 | % | |
| Resistance Temperature Coefficient | ∆RAB/∆T | VAB = VDD, Wiper = No Connect | 800 | ppm/°C | ||
| Wiper Resistance | RW | IW = VDD/R, VDD = +3 V or +5 V | 40 | 100 | Ω | |
| Input Logic High | VIH | VDD = +5 V/+3 V | 2.4/2.1 | V | ||
| Input Logic Low | VIL | VDD = +5 V/+3 V | 0.8/0.6 | V | ||
| Power Supply Range | VDD | 2.7 | 5.5 | V | ||
| Supply Current | IDD | VIH = +5 V or VIL = 0 V, VDD = +5 V | 15 | 40 | µA |
Key Features
- Digital Control: The AD5220 features a 128-position digitally controlled variable resistor, allowing for precise adjustments via a three-wire serial interface (CLK, CS, and UP/DOWN).
- Low Power Consumption: The device operates with very low power, with a maximum supply current of 40 µA.
- Multiple Resistance Values: Available in 10 kΩ, 50 kΩ, and 100 kΩ end-to-end resistance values.
- Temperature Stability: The resistor has a nominal temperature coefficient of 800 ppm/°C.
- Compact Packaging: Available in SO-8, 8-lead plastic DIP, and thin μSOIC packages.
- Automotive Qualified: Suitable for automotive applications, with extended industrial temperature range of -40°C to +85°C.
Applications
- Mechanical Potentiometer Replacement: Ideal for replacing mechanical potentiometers in various applications.
- Incremental Adjustment Applications: Suitable for gain, offset adjustment, and other incremental adjustment needs in instrumentation.
- Programmable Voltage-to-Current Conversion: Can be used in programmable voltage-to-current conversion circuits.
- Programmable Filters, Delays, Time Constants: Useful in designing programmable filters, delays, and time constants.
- Line Impedance Matching: Can be applied in line impedance matching applications.
- Power Supply Adjustment: Suitable for adjusting power supply settings.
Q & A
- What is the AD5220BRZ100 used for?
The AD5220BRZ100 is a digitally controlled variable resistor used to replace mechanical potentiometers and provide precise digital control over resistance values.
- What are the available resistance values for the AD5220BRZ100?
The device is available in 10 kΩ, 50 kΩ, and 100 kΩ end-to-end resistance values.
- How is the resistance adjusted in the AD5220BRZ100?
The resistance is adjusted using a three-wire serial interface (CLK, CS, and UP/DOWN) that controls the internal UP/DOWN counter.
- What is the power consumption of the AD5220BRZ100?
The device operates with a maximum supply current of 40 µA.
- Is the AD5220BRZ100 suitable for automotive applications?
Yes, the AD5220BRZ100 is qualified for automotive applications and operates over an extended industrial temperature range of -40°C to +85°C.
- What types of packages are available for the AD5220BRZ100?
The device is available in SO-8, 8-lead plastic DIP, and thin μSOIC packages.
- What is the temperature coefficient of the AD5220BRZ100?
The resistor has a nominal temperature coefficient of 800 ppm/°C.
- Why is external debounce circuitry required for the AD5220BRZ100?
External debounce circuitry is required for the negative-edge sensitive CLK pin to avoid clocking multiple pulses into the internal UP/DOWN counter.
- What are some common applications of the AD5220BRZ100?
Common applications include mechanical potentiometer replacement, incremental adjustment in instrumentation, programmable voltage-to-current conversion, and power supply adjustment.
- How does the AD5220BRZ100 power on?
The device powers on in a centered wiper position, exhibiting nearly equal resistances of RWA and RWB.
