Analog Devices Inc. AD5245BRJZ50-R2

Overview

AD5245BRJZ50-R2 from Analog Devices is a 256-position I²C-compatible digital potentiometer with 50 kΩ end-to-end resistance, SOT-23-8 package (2.9 mm × 3 mm), ±0.25 LSB integral nonlinearity, 45 ppm/°C resistance tempco, and operates from 2.7 V to 5.5 V - used for precision LCD VCOM adjustment and RF amplifier biasing in automotive and industrial systems.

For engineers reviewing the AD5245BRJZ50-R2 datasheet, AD5245BRJZ50-R2 pinout, AD5245BRJZ50-R2 application, or AD5245BRJZ50-R2 equivalent, key selection criteria include I²C address flexibility via AD0, midscale power-on preset, shutdown mode (<1 µA), and guaranteed monotonicity in both rheostat and potentiometer modes.

Technical Context

The AD5245BRJZ50-R2 implements a thin-film resistor ladder with CMOS switch matrix controlled by an 8-bit wiper register, supporting both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations. Its I²C interface uses standard-mode timing (400 kHz max) with programmable slave address via AD0 pin.

Internal power-on circuitry forces wiper to code 0x80 (midscale) at VDD ramp-up; shutdown mode opens Terminal A and shorts W to B, preserving register contents. Temperature drift is minimized via ratio-based operation in divider mode (15 ppm/°C voltage tempco) versus absolute-resistance mode (45 ppm/°C).

Key Specifications

Pinout & Package

AD5245BRJZ50-R2 is housed in a compact 8-lead SOT-23-8 package (2.9 mm × 3 mm), optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX5487ETE+T and MCP41050-I/P, AD5245BRJZ50-R2 offers I²C address flexibility (AD0), smaller SOT-23 footprint, and guaranteed monotonicity - making it optimal for space-constrained, multi-device I²C systems requiring deterministic analog tuning behavior.

Availability

AD5245BRJZ50-R2 is available at Aetrix Electronics and suitable for LCD panel VCOM adjustment, RF amplifier biasing, and automotive sensor calibration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD5245BRJZ50-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD5245 product line delivers compact, low-power digital potentiometers for replacing mechanical trimmers in precision analog signal conditioning - targeting applications where reliability, temperature stability, and I²C configurability are critical.

FAQ

What is the power-on behavior of the AD5245BRJZ50-R2?

The AD5245BRJZ50-R2 features an internal power-on reset circuit that automatically sets the wiper to midscale (code 0x80) upon VDD ramp-up. This eliminates the need for host MCU initialization and ensures predictable startup in safety-critical systems. The AD5245BRJZ50-R2 maintains this state until the first I²C command is received, and the behavior is guaranteed across –40°C to +125°C.

Can multiple AD5245BRJZ50-R2 devices share the same I²C bus?

Yes - the AD5245BRJZ50-R2 includes an AD0 pin that selects between I²C slave addresses 0x2C and 0x2D, allowing two devices on a single I²C bus without address collision. No additional hardware or level-shifting is required. This capability is confirmed in the AD5245BRJZ50-R2 datasheet Rev. C, Table 10 and Figure 44.

What is the maximum voltage allowed at terminals A, B, or W of the AD5245BRJZ50-R2?

The AD5245BRJZ50-R2 specifies that VA, VB, and VW must remain within GND ≤ V ≤ VDD per Absolute Maximum Ratings (Table 4). Voltages exceeding this range forward-bias internal ESD protection diodes, potentially powering VDD unintentionally. Therefore, the AD5245BRJZ50-R2 must be powered (VDD/GND established) before applying any signal to A/B/W terminals.

Does the AD5245BRJZ50-R2 retain its wiper setting after power loss?

No - the AD5245BRJZ50-R2 is a volatile digital potentiometer with no EEPROM or nonvolatile memory. Upon power cycle, it resets to midscale (0x80) regardless of prior setting. For nonvolatile storage, external MCU firmware must reprogram the AD5245BRJZ50-R2 after each power-up using its I²C interface.

How does shutdown mode affect the AD5245BRJZ50-R2's terminal connections?

In shutdown mode (SD bit = 1), the AD5245BRJZ50-R2 opens Terminal A and shorts W to B, resulting in ~0 Ω resistance between W and B in rheostat mode or 0 V output in potentiometer mode. Crucially, the wiper register contents are preserved, so exiting shutdown restores the prior resistance setting without host intervention.