Overview
The AD5291BRUZ-20, manufactured by Analog Devices Inc., is a single-channel, 256-position digital potentiometer. This device combines industry-leading variable resistor performance with nonvolatile memory (NVM) in a compact 14-lead TSSOP package. It is designed to operate across a wide voltage range, supporting both dual supply operation at ±10.5 V to ±16.5 V and single supply operation at +21 V to +33 V. The AD5291BRUZ-20 is notable for its low resistor tolerance error of ±1%, which simplifies open-loop applications, precision calibration, and tolerance matching applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Nominal Resistance | RAB | - | 20 kΩ, 50 kΩ, 100 kΩ | - | - | Ω |
| Resistor Tolerance Error | - | - | - | - | ±1% | % |
| Temperature Coefficient (Rheostat Mode) | - | - | - | - | 35 ppm/°C | ppm/°C |
| Temperature Coefficient (Voltage Divider Mode) | - | - | - | - | 5 ppm/°C | ppm/°C |
| Bandwidth | BW | -3 dB, code = half scale | 105 kHz (RAB = 100 kΩ) | 210 kHz (RAB = 50 kΩ) | 520 kHz (RAB = 20 kΩ) | kHz |
| Total Harmonic Distortion | THD | VA = 1 V rms, VB = 0 V, f = 1 kHz | -106 dB (RAB = 100 kΩ) | -101 dB (RAB = 50 kΩ) | -93 dB (RAB = 20 kΩ) | dB |
| Settling Time | tS | VA = 30 V, VB = 0 V, ±0.5 LSB error band | 2.5 µs (Code = full scale, R-Perf mode) | 750 ns (Code = full scale, normal mode) | - | ns/µs |
| Operating Temperature Range | - | - | -40°C | - | +105°C | °C |
Key Features
- Single-channel, 256-position resolution
- 20 kΩ, 50 kΩ, and 100 kΩ nominal resistance options
- Maximum ±1% nominal resistor tolerance error
- 20-times programmable (20-TP) wiper memory
- SPI-compatible serial interface for wiper setting control
- Wiper setting readback capability
- No external voltage supply required for fuse blow
- Compact 14-lead TSSOP package
- Extended industrial temperature range of −40°C to +105°C
Applications
- Mechanical potentiometer replacement
- Instrumentation: gain and offset adjustment
- Programmable voltage-to-current conversion
- Programmable filters, delays, and time constants
- Programmable power supply
- Low resolution DAC replacement
- Sensor calibration
Q & A
- What is the nominal resistance range of the AD5291BRUZ-20?
The AD5291BRUZ-20 is available with nominal resistances of 20 kΩ, 50 kΩ, and 100 kΩ.
- What is the resistor tolerance error of the AD5291BRUZ-20?
The resistor tolerance error is ±1%.
- What is the temperature coefficient in rheostat mode?
The temperature coefficient in rheostat mode is 35 ppm/°C).
- What is the temperature coefficient in voltage divider mode?
The temperature coefficient in voltage divider mode is 5 ppm/°C).
- What is the operating temperature range of the AD5291BRUZ-20?
The operating temperature range is −40°C to +105°C).
- How is the wiper setting controlled and read back?
The wiper setting is controlled through the SPI digital interface, and it supports wiper setting readback).
- Does the AD5291BRUZ-20 require an external voltage supply for fuse blow?
No, it does not require an external voltage supply for fuse blow).
- What is the package type of the AD5291BRUZ-20?
The package type is a compact 14-lead TSSOP).
- What are some common applications of the AD5291BRUZ-20?
Common applications include mechanical potentiometer replacement, instrumentation, programmable voltage-to-current conversion, programmable filters, and sensor calibration).
- How many times can the wiper position be permanently programmed?
The wiper position can be permanently programmed 20 times using the 20-TP memory).
