Overview
The AD5231BRUZ50-REEL7, produced by Analog Devices Inc., is a nonvolatile memory, digitally controlled potentiometer with a 1024-step resolution. This device functions as a true variable resistor replacement, offering enhanced resolution, solid-state reliability, and remote controllability. It is designed to perform the same electronic adjustment functions as a mechanical potentiometer but with the advantages of digital control and nonvolatile memory.
The AD5231 is available in a 16-lead TSSOP package and operates over an extended industrial temperature range of −40°C to +85°C. It features a standard 3-wire SPI-compatible serial interface, allowing for versatile programming and adjustment modes.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | - | - | 1024 steps | - | - |
| Terminal Resistance | - | - | 10 kΩ, 50 kΩ, 100 kΩ | - | - |
| Power Supply | VSS = 0 V | 2.7 V | - | 5.5 V | V |
| Dual-Supply Power Range | - | ±2.25 V | - | ±2.75 V | V |
| Positive Supply Current | VIH = VDD or VIL = GND | 2.7 µA | - | 10 µA | µA |
| Input Current | VIN = 0 V or VDD | - | - | ±2.5 µA | µA |
| Input Capacitance | - | - | - | 4 pF | pF |
| Output Current | VDD = 5 V, VSS = 0 V, TA = 25°C | - | - | 50 mA | mA |
| EEMEM Store Mode Current | VIH = VDD or VIL = GND, VSS = GND, ISS ≈ 0 | - | - | 40 mA | mA |
Key Features
- Nonvolatile memory maintains wiper setting even after power-off.
- Power-on refresh with EEMEM setting.
- EEMEM restore time: 140 μs typical.
- Full monotonic operation.
- Permanent memory write protection.
- Predefined linear increment/decrement instructions and ±6 dB/step log taper increment/decrement instructions.
- SPI-compatible serial interface.
- 3 V to 5 V single-supply or ±2.5 V dual-supply operation.
- Wiper setting readback capability.
- 28 bytes extra nonvolatile memory for user-defined data.
- 100-year typical data retention at TA = 55°C.
Applications
- Mechanical potentiometer replacement.
- Instrumentation: gain, offset adjustment.
- Programmable voltage to current conversion.
- Programmable filters, delays, time constants.
- Programmable power supply.
- Low resolution DAC replacement.
- Sensor calibration.
Q & A
- What is the resolution of the AD5231 digital potentiometer?
The AD5231 has a 1024-step resolution.
- What are the available terminal resistances for the AD5231?
The terminal resistances available are 10 kΩ, 50 kΩ, and 100 kΩ.
- What is the operating temperature range of the AD5231?
The device operates over an extended industrial temperature range of −40°C to +85°C.
- What type of interface does the AD5231 use for programming?
The AD5231 uses a standard 3-wire SPI-compatible serial interface.
- How does the AD5231 store and restore its settings?
The device stores settings in nonvolatile EEMEM, which is restored automatically during system power-on.
- What is the purpose of the extra nonvolatile memory in the AD5231?
The extra 28 bytes of nonvolatile memory are for user-defined data, such as memory data for other components, look-up tables, or system identification information.
- How long does it take to store EEMEM data in the AD5231?
The storing of EEMEM data takes approximately 25 ms.
- What is the typical data retention time for the AD5231 at 55°C?
The typical data retention time is 100 years at 55°C.
- What are some common applications of the AD5231?
Common applications include mechanical potentiometer replacement, instrumentation, programmable voltage to current conversion, programmable filters, delays, time constants, programmable power supply, low resolution DAC replacement, and sensor calibration.
- What package type is the AD5231 available in?
The AD5231 is available in a 16-lead TSSOP package.
