Analog Devices Inc. AD5247BKSZ100-R2

Overview

AD5247BKSZ100-R2 from Analog Devices is a 128-position I²C-compatible digital potentiometer in SC70-6 package with 100 kΩ end-to-end resistance, ±20% nominal tolerance, and 45 ppm/°C rheostat temperature coefficient. It operates from 2.7 V to 5.5 V, draws 0.9 µA typical supply current at 3.3 V, and supports midscale power-on preset for sensor biasing and LCD contrast control.

For engineers reviewing the AD5247BKSZ100-R2 datasheet, AD5247BKSZ100-R2 pinout, AD5247BKSZ100-R2 application, or AD5247BKSZ100-R2 equivalent, key selection criteria include I²C slave address (0x5E), wiper resistance ≤300 Ω at code 0x00, ±1 LSB DNL in potentiometer mode, −40°C to +125°C operating range, and SC70-6 thermal resistance of 340°C/W.

Technical Context

The AD5247BKSZ100-R2 implements a 7-bit RDAC latch decoded to select one of 128 linearly spaced tap points across a thin-film 100 kΩ resistor string. Its I²C interface supports standard-mode (400 kHz) timing with SCL high/low periods ≥0.6 µs and data setup/hold times compliant with I²C specification.

In rheostat mode (A open, W–B active), output resistance follows RWB = (D × RAB)/128 + 2 × RW; in potentiometer divider mode (A–B biased), VW = VA × D/128 (ideal) or VW = VA × RWB/(RWA + RWB) (with wiper resistance), delivering 15 ppm/°C voltage-divider temperature coefficient.

Key Specifications

Pinout & Package

SC70-6 package (2.0 mm × 2.1 mm × 0.9 mm), 6-pin surface-mount with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5247BKSZ100-R2, AD5170BRMZ-100 offers 8× more steps but requires PCB layout changes and firmware adaptation for SPI, while MCP4018T-104I/OT matches pin count and bus but sacrifices temperature stability and absolute max ratings.

Availability

AD5247BKSZ100-R2 is available at Aetrix Electronics and suitable for pressure sensor calibration, LCD contrast control, RF amplifier biasing, and industrial temperature transmitter applications requiring stable component supply across automotive and industrial temperature ranges.

Supply support for AD5247BKSZ100-R2 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The AD5247 product line delivers compact, low-power digital potentiometers optimized for replacing mechanical trimmers in harsh-environment applications including automotive, industrial sensing, and portable instrumentation.

FAQ

What is the I²C slave address for AD5247BKSZ100-R2?

The AD5247BKSZ100-R2 uses a fixed 7-bit I²C slave address of 0x5E (1011110b), with R/W bit appended. This address is hard-coded and shared across all AD5247 10 kΩ and 100 kΩ variants in the BKSZ and BKS families per Table 8 of the Rev. F datasheet. No external address pins are provided, so only one AD5247BKSZ100-R2 can reside on a given I²C bus unless level-shifting or multiplexing is implemented.

Does AD5247BKSZ100-R2 support both rheostat and potentiometer configurations?

Yes, AD5247BKSZ100-R2 supports both configurations. In rheostat mode, Terminal A is left open and resistance is measured between W and B (or W and A); in potentiometer mode, Terminals A and B are biased to define a voltage divider with W as the adjustable tap. The datasheet confirms monotonicity and specified DNL/INL for both modes, with distinct temperature coefficients: 45 ppm/°C for rheostat and 15 ppm/°C for potentiometer divider operation.

What is the maximum current rating for the wiper terminal of AD5247BKSZ100-R2?

The AD5247BKSZ100-R2 wiper terminal supports ±5 mA continuous current and ±20 mA pulsed current per Absolute Maximum Ratings (Table 4). Exceeding these limits risks degradation of internal CMOS switches. At code 0x00, wiper-to-B resistance is 150 Ω minimum, so applying >750 mV across W–B would exceed the 5 mA continuous limit - design must ensure voltage compliance with current constraints in all operating codes.

How does the power-on preset function work in AD5247BKSZ100-R2?

The AD5247BKSZ100-R2 features an internal power-on reset circuit that automatically loads code 0x40 (midscale) into the RDAC latch upon VDD ramping above 2.7 V. This occurs independently of I²C activity and ensures a known, repeatable resistance state (50 kΩ ±20%) at startup. No external hardware or software initialization is required to achieve this default condition, simplifying system boot sequences in sensor and display applications.

Can AD5247BKSZ100-R2 operate with a 2.7 V supply and still meet all specifications?

Yes, AD5247BKSZ100-R2 is fully specified from 2.7 V to 5.5 V. Electrical Characteristics tables explicitly list parameters at VDD = 2.7 V, including supply current (0.9 µA typ), DNL (±1 LSB), and bandwidth (40 kHz for 100 kΩ version). Performance curves (Figures 4–13) confirm INL/DNL, tempco, and error behavior remain within spec across the full voltage range, making it suitable for single-cell Li-ion and energy-harvesting systems.