Analog Devices Inc. AD5271BCPZ-20-RL7

Overview

AD5271BCPZ-20-RL7 from Analog Devices is a single-channel, 256-position digital rheostat with 20 kΩ nominal resistance, ±1% end-to-end resistor tolerance error, SPI interface, and 50-times programmable (50-TP) nonvolatile wiper memory - used for precision gain/offset calibration in industrial instrumentation and op-amp feedback networks.

For engineers reviewing the AD5271BCPZ-20-RL7 datasheet, AD5271BCPZ-20-RL7 pinout, AD5271BCPZ-20-RL7 application, or AD5271BCPZ-20-RL7 equivalent, key selection criteria include guaranteed 1% resistor tolerance in R-Perf mode, 5 ppm/°C tempco in rheostat configuration, 3 mm × 3 mm LFCSP-10 package, and dual-supply operation supporting ±2.5 V bipolar signal adjustment.

Technical Context

The AD5271BCPZ-20-RL7 implements a segmented thin-film resistor ladder with digitally controlled CMOS switches to realize precise rheostat behavior. Its 8-bit RDAC register directly sets wiper position across 256 discrete taps, with integral nonlinearity (R-INL) ≤ ±1 LSB and differential nonlinearity (R-DNL) ≤ ±1 LSB over −40°C to +125°C.

R-Perf mode enables 1% resistor tolerance calibration across defined code ranges (e.g., 0x1E–0xFF at |VDD−VSS| = 4.5–5.5 V), while 50-TP memory stores one wiper setting permanently via fuse-blow programming requiring no external voltage - executed in ~350 ms with 4 mA peak current.

Key Specifications

Pinout & Package

AD5271BCPZ-20-RL7 is housed in a 3 mm × 3 mm × 0.8 mm, 10-lead LFCSP package with exposed pad (EPAD). Pin functions are validated per Analog Devices Rev. H datasheet Figure 6 and Table 10.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital rheostat applications.

Compared with AD5271BCPZ-20-RL7, AD5272BRUZ-20 offers higher resolution but sacrifices compact LFCSP packaging and identical 1% R-Perf code coverage, while MCP41HV51-203 lacks guaranteed tolerance and nonvolatile memory - making AD5271BCPZ-20-RL7 optimal for space-constrained, high-accuracy calibration tasks requiring factory-set permanence.

Availability

AD5271BCPZ-20-RL7 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable op-amp gain control, and programmable power supply feedback requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD5271BCPZ-20-RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.

The AD5270/AD5271 family was designed specifically for high-accuracy, nonvolatile digital rheostat replacement in calibration-critical analog signal chains - emphasizing guaranteed resistor tolerance, low tempco, and robust 50-TP memory architecture.

FAQ

What is the guaranteed resistor tolerance of AD5271BCPZ-20-RL7 in precision applications?

The AD5271BCPZ-20-RL7 guarantees ±1% end-to-end resistor tolerance in R-Perf mode across specific code ranges - for example, codes 0x1E to 0xFF at |VDD−VSS| = 4.5–5.5 V. This tolerance is validated over −40°C to +125°C and enables open-loop calibration without trimming. Outside R-Perf mode, tolerance degrades to ±15%. The AD5271BCPZ-20-RL7 datasheet Table 5 defines exact code boundaries per supply condition.

How does the 50-TP memory function in AD5271BCPZ-20-RL7, and what is its programming lifetime?

The AD5271BCPZ-20-RL7 features 50-TP (50-times programmable) nonvolatile memory that permanently stores one wiper position using fuse-blow technology. Each program cycle consumes ~4 mA for 55 ms and completes in ~350 ms total. The memory retains data over 100k power cycles and across −40°C to +125°C. Once programmed, AD5271BCPZ-20-RL7 automatically restores this value at power-up. No external voltage is needed - programming uses only VDD/VSS rails.

Can AD5271BCPZ-20-RL7 operate with bipolar analog signals, and what are the voltage limits?

Yes, AD5271BCPZ-20-RL7 supports true bipolar operation with ±2.5 V to ±2.75 V dual supplies, enabling ground-referenced AC or bipolar signal adjustment. Terminal A and W accept voltages from VSS to VDD - so with VSS = −2.5 V and VDD = +2.5 V, analog signals from −2.5 V to +2.5 V are fully supported. Absolute maximum ratings allow VA/VW up to VSS − 0.3 V and VDD + 0.3 V, per datasheet Table 8.

What package type and thermal performance does AD5271BCPZ-20-RL7 use?

AD5271BCPZ-20-RL7 uses a 3 mm × 3 mm × 0.8 mm, 10-lead LFCSP package with exposed pad (EPAD). Its junction-to-ambient thermal resistance (θJA) is 58.4°C/W in JEDEC natural convection, significantly lower than the MSOP variant (161.8°C/W). This compact thermally enhanced package supports high-density PCB layouts while maintaining safe junction temperatures under typical 1 µA supply current and 20 kΩ load conditions.

Does AD5271BCPZ-20-RL7 support SPI daisy-chaining, and how is it implemented?

Yes, AD5271BCPZ-20-RL7 supports SPI daisy-chaining via its SDO (serial data out) pin, which operates as an open-drain output requiring an external pull-up resistor. In daisy-chain mode, the SDO of one device connects to the DIN of the next. Data is clocked through multiple devices using shared SCLK and SYNC lines. Command execution remains independent per device, and readback is sequential. This capability is documented in the AD5271BCPZ-20-RL7 datasheet Section "SDO Pin and Daisy-Chain Operation".