Analog Devices Inc. AD5293BRUZ-20-RL7

Overview

AD5293BRUZ-20-RL7 from Analog Devices is a single-channel, 1024-position digital potentiometer with 20 kΩ nominal resistance, ±1% end-to-end resistor tolerance in resistor performance mode, and 35 ppm/°C rheostat temperature coefficient. It operates from 9 V to 33 V single supply or ±9 V to ±16.5 V dual supply, features SPI-compatible serial interface, wiper readback, and is used for precision gain/offset adjustment in instrumentation and programmable power supplies.

For engineers reviewing the AD5293BRUZ-20-RL7 datasheet, AD5293BRUZ-20-RL7 pinout, AD5293BRUZ-20-RL7 application, or AD5293BRUZ-20-RL7 equivalent, key selection criteria include guaranteed 1% R-tolerance in R-perf mode, 10-bit resolution, high-voltage terminal rating (V_A/V_B/V_W = V_SS to V_DD), extended industrial temperature range (−40°C to +105°C), and TSSOP-14 package compatibility.

Technical Context

The AD5293BRUZ-20-RL7 implements a digitally controlled variable resistor using a segmented thin-film resistor ladder with CMOS switch matrix, supporting both rheostat (two-terminal) and potentiometer divider (three-terminal) configurations. Its resistor performance mode enables calibrated 1% end-to-end tolerance by restricting valid code ranges per Table 2 of the datasheet.

It uses a 16-bit SPI-compatible serial interface with SYNC frame synchronization, SCLK up to 50 MHz, and open-drain RDY/SDO pins for write completion indication and daisy-chain readback. Internal power-on reset and hardware RESET pin ensure deterministic midscale initialization.

Key Specifications

Pinout & Package

The AD5293BRUZ-20-RL7 is housed in a 14-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pin 1 is marked with dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5292BRUZ-20-RL7 and MCP42050-I/ST, the AD5293BRUZ-20-RL7 uniquely delivers guaranteed 1% resistor tolerance with wiper readback and ±16.5 V dual-supply capability-enabling high-accuracy, high-voltage analog tuning unattainable with either alternative.

Availability

AD5293BRUZ-20-RL7 is available at Aetrix Electronics and suitable for instrumentation gain adjustment, programmable power supply design, and sensor calibration requiring stable component supply across extended temperature and voltage ranges.

Supply support for AD5293BRUZ-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, headquartered in Norwood, MA.

The AD5293 is part of Analog Devices' precision digital potentiometer product line, engineered for high-voltage, high-accuracy analog tuning in industrial, test & measurement, and medical instrumentation applications.

FAQ

What is the guaranteed resistor tolerance of AD5293BRUZ-20-RL7 in resistor performance mode?

The AD5293BRUZ-20-RL7 guarantees ±1% end-to-end resistor tolerance in resistor performance mode, validated across the specified operating temperature range (−40°C to +105°C) and supply conditions. This tolerance applies only within the code ranges defined in Table 2 of the datasheet (e.g., 0x15E–0x3FF for RWB at |VDD−VSS| = 30–33 V). Outside this mode, nominal tolerance is ±7%.

Does AD5293BRUZ-20-RL7 support dual-supply operation, and what are the voltage limits?

Yes, AD5293BRUZ-20-RL7 supports dual-supply operation from ±9 V to ±16.5 V. Terminal voltages VA, VB, and VW are rated from VSS to VDD, enabling true bipolar signal adjustment with ground-referenced inputs. The device maintains full 10-bit resolution and 1% tolerance compliance across this range, as confirmed in Tables 1 and 3 of the Rev. E datasheet.

Can AD5293BRUZ-20-RL7 be used in a rheostat configuration, and what is its wiper resistance?

Yes, AD5293BRUZ-20-RL7 operates in rheostat mode using terminals A and W or B and W. Its wiper resistance is specified at 60–100 Ω (typical 80 Ω), measured under standard conditions. This low value minimizes insertion error in current-sensing or gain-setting paths, especially when combined with the 35 ppm/°C temperature coefficient for stable performance.

What is the maximum clock frequency supported by the SPI interface of AD5293BRUZ-20-RL7?

The AD5293BRUZ-20-RL7 supports SCLK frequencies up to 50 MHz, with minimum high/low times of 10 ns each (Table 5). Timing is CPOL = 0 and CPHA = 1, meaning data is sampled on the falling edge of SCLK. The 16-bit shift register requires 16 clock cycles per transaction, enabling sub-microsecond update times in normal mode (410 ns RDY low time).

Is wiper position readback supported on AD5293BRUZ-20-RL7, and how is it implemented?

Yes, AD5293BRUZ-20-RL7 supports wiper position readback via the SDO pin. When a read command is issued (C3 = 1, C2 = 0 in Figure 2), the current 10-bit wiper code is shifted out MSB-first on SDO, synchronized to SCLK falling edges. SDO is open-drain and requires an external pull-up resistor; timing is specified in Table 5 (t14 = 450 ns max).