Overview
The AD5231BRU10, produced by Analog Devices Inc., is a nonvolatile memory, digitally controlled potentiometer with 1024-position resolution. This device performs the same electronic adjustment function as a mechanical potentiometer but offers enhanced resolution, solid-state reliability, and remote controllability. It is designed to operate as a true variable resistor replacement for analog signals within the terminal voltage range of VSS < VTERM < VDD.
The AD5231 features versatile programming using a standard 3-wire SPI-compatible serial interface, supporting 16 modes of operation and adjustment, including scratchpad programming, memory storing and restoring, and predefined increment/decrement instructions.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Resolution | - | - | - | 1024 positions | - | - |
| Terminal Resistance | RAB | - | 10 kΩ, 50 kΩ, 100 kΩ | - | - | - |
| Single-Supply Power Range | VDD | VSS = 0 V | 2.7 V | - | 5.5 V | V |
| Dual-Supply Power Range | VDD/VSS | - | ±2.25 V | - | ±2.75 V | V |
| Positive Supply Current | IDD | VIH = VDD or VIL = GND | 2.7 µA | - | 10 µA | µA |
| Input Current | IIL | VIN = 0 V or VDD | - | ±2.5 µA | - | µA |
| Output Current | IO1, IO2 | VDD = 5 V, VSS = 0 V, TA = 25°C | - | 50 mA | - | mA |
| EEMEM Restore Time | tEEMEM1 | RAB = 10 kΩ | - | 140 µs | - | µs |
Key Features
- 1024-position resolution
- Nonvolatile memory maintains wiper setting
- Power-on refresh with EEMEM setting
- EEMEM restore time: 140 µs typical
- Full monotonic operation
- Permanent memory write protection
- Wiper setting readback
- Predefined linear increment/decrement instructions
- Predefined ±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
- 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 AD5231BRU10?
The AD5231BRU10 has a 1024-position resolution.
- What types of terminal resistance are available for the AD5231BRU10?
The AD5231BRU10 is available with 10 kΩ, 50 kΩ, and 100 kΩ terminal resistance.
- What is the power supply range for the AD5231BRU10?
The AD5231BRU10 can operate with a single supply from 2.7 V to 5.5 V or a dual supply from ±2.25 V to ±2.75 V.
- How does the AD5231BRU10 store and restore its settings?
The AD5231BRU10 uses nonvolatile memory (EEMEM) to store settings, which are restored during power-on with a typical restore time of 140 µs.
- What interface does the AD5231BRU10 use for programming?
The AD5231BRU10 uses a SPI®-compatible serial interface for programming.
- What are some common applications of the AD5231BRU10?
Common applications include mechanical potentiometer replacement, instrumentation for gain and offset adjustment, programmable voltage to current conversion, and sensor calibration.
- How much extra nonvolatile memory does the AD5231BRU10 have for user-defined data?
The AD5231BRU10 has 28 bytes of extra nonvolatile memory for user-defined data.
- What is the typical data retention period for the AD5231BRU10?
The AD5231BRU10 has a typical data retention period of 100 years at TA = 55°C.
- What is the operating temperature range for the AD5231BRU10?
The AD5231BRU10 is guaranteed to operate over the extended industrial temperature range of −40°C to +85°C.
- What package type is the AD5231BRU10 available in?
The AD5231BRU10 is available in a 16-lead TSSOP package.
