Overview
The AD5254BRU100-RL7, produced by Analog Devices Inc., is a quad-channel, I²C-compatible, nonvolatile memory digital potentiometer. This device performs the same electronic adjustment functions as mechanical potentiometers, trimmers, and variable resistors. It features 256-position resolution and is available in a 20-lead TSSOP package. The AD5254 is designed to provide versatile programmability, including read/write access to RDAC and EEMEM registers, increment/decrement of resistance, and resistance changes in ±6 dB scales. It also includes extra EEMEM for storing user-defined information such as memory data for other components, lookup tables, or system identification information.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Resolution | - | - | 256 positions | - | - |
| Resistance Range | - | - | 100 kΩ | - | - |
| Supply Voltage | - | 2.7 V | - | 5.5 V | V |
| Dual Supply Voltage | - | ±2.25 V | - | ±2.75 V | V |
| Operating Temperature | - | -40°C | - | +105°C | °C |
| Wiper Resistance | IW = 1 V/R, VDD = 5 V | 75 Ω | - | 130 Ω | Ω |
| Wiper Resistance | IW = 1 V/R, VDD = 3 V | 200 Ω | - | 300 Ω | Ω |
| Resistance Tolerance | TA = 25°C | -20% | - | +20% | % |
| Resistance Temperature Coefficient | - | - | 650 ppm/°C | - | - |
| Channel-Resistance Matching | RAB = 100 kΩ | - | - | 0.05% | % |
| Differential Nonlinearity (DNL) | - | -1.0 LSB | - | +1.0 LSB | LSB |
| Integral Nonlinearity (INL) | - | -1.5 LSB | - | +1.5 LSB | LSB |
Key Features
- Quad-channel, I²C-compatible interface with direct read/write access to RDAC and EEMEM registers.
- 256-position resolution with nonvolatile memory to store wiper settings.
- Predefined linear increment/decrement commands and ±6 dB step change commands.
- Synchronous or asynchronous quad-channel update mode.
- Wiper setting readback and extra EEMEM for user-defined information.
- Patented resistance-tolerance storing function for precision applications.
- Single supply operation from 2.7 V to 5.5 V and dual supply operation from ±2.25 V to ±2.75 V.
- Operating temperature range from –40°C to +105°C.
- 100-year typical data retention at TA = 55°C.
Applications
- Mechanical potentiometer replacement.
- Low resolution DAC replacement.
- RGB LED backlight control.
- White LED brightness adjustment.
- RF base station power amp bias control.
- Programmable gain and offset control.
- Programmable attenuators.
- Programmable voltage-to-current conversion.
- Programmable power supply.
- Programmable filters.
- Sensor calibrations.
Q & A
- What is the resolution of the AD5254BRU100-RL7?
The AD5254BRU100-RL7 has a resolution of 256 positions. - What are the available resistance ranges for the AD5254?
The AD5254 is available in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ resistance ranges. - What is the operating temperature range of the AD5254?
The operating temperature range is from –40°C to +105°C. - Does the AD5254 support nonvolatile memory?
Yes, the AD5254 supports nonvolatile memory to store wiper settings. - What is the typical data retention time for the AD5254 at 55°C?
The typical data retention time is 100 years at 55°C. - Can the AD5254 be used in synchronous or asynchronous mode?
Yes, the AD5254 supports both synchronous and asynchronous quad-channel update modes. - What is the supply voltage range for the AD5254?
The supply voltage range is from 2.7 V to 5.5 V for single supply and ±2.25 V to ±2.75 V for dual supply. - Does the AD5254 have extra EEMEM for user-defined information?
Yes, the AD5254 has 12 extra bytes in EEMEM for storing user-defined information. - What are some common applications of the AD5254?
Common applications include mechanical potentiometer replacement, RGB LED backlight control, white LED brightness adjustment, and programmable gain and offset control. - How does the AD5254 handle resistance tolerance?
The AD5254 has a patented resistance-tolerance storing function that allows users to access the EEMEM and obtain the absolute end-to-end resistance values of the RDACs.
