Analog Devices Inc. AD5203ARU100

Overview

AD5203ARU100 from Analog Devices is a quad-channel, 64-position digital potentiometer in TSSOP-24 package with 100 kΩ end-to-end resistance, ±1% channel-to-channel matching, 700 ppm/°C temperature coefficient, and 3-wire SPI-compatible serial interface. It replaces four mechanical potentiometers in programmable gain amplifiers, line impedance matching circuits, and power supply trimming applications.

For engineers reviewing the AD5203ARU100 datasheet, AD5203ARU100 pinout, AD5203ARU100 application, or AD5203ARU100 equivalent, key selection criteria include its 100 kΩ nominal resistance, shutdown current <5 µA, 6-bit resolution, midscale preset via RS pin, and daisy-chainable SDO output for multi-device configurations.

Technical Context

The AD5203ARU100 implements four independent 6-bit resistor ladders with wiper terminals, each controlled by a dedicated 6-bit latch loaded via an 8-bit serial word (2 address + 6 data bits). Address decoding selects RDAC#1–#4 using A1/A0 inputs, enabling per-channel updates without affecting others.

Its architecture supports both rheostat (A–W or B–W) and potentiometer divider (A–B–W) modes. In divider mode, voltage output exhibits 20 ppm/°C tempco due to ratio-based operation; in rheostat mode, absolute resistance drifts at 700 ppm/°C. Shutdown disconnects all A terminals and shorts W to B, reducing supply current to ≤5 µA.

Key Specifications

Pinout & Package

AD5203ARU100 is housed in a 24-lead Thin Shrink Small Outline Package (TSSOP-24, RU-24), 4.4 mm × 7.9 mm × 1.1 mm, with 0.65 mm lead pitch. All AGND pins must be connected to DGND potential for optimal noise isolation and crosstalk suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5203ARU10 and AD8403ARU100, the AD5203ARU100 offers optimal trade-off between step resolution (64), thermal noise (29 nV/√Hz), and cost for mid-precision industrial trimming - whereas AD5203ARU10 suits low-Z/high-speed use, and AD8403ARU100 targets high-resolution calibration.

Availability

AD5203ARU100 is available at Aetrix Electronics and suitable for programmable gain amplifiers, line impedance matching networks, and power supply trimming applications requiring stable component supply across extended industrial temperature ranges (–40°C to +85°C).

Supply support for AD5203ARU100 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 AD5203 product line delivers quad-channel digital potentiometers optimized for replacing mechanical trimmers in industrial, instrumentation, and communications equipment where reliability, temperature stability, and serial configurability are critical.

FAQ

What is the nominal end-to-end resistance of the AD5203ARU100?

The AD5203ARU100 has a nominal end-to-end resistance (R_AB) of 100 kΩ, as indicated by the "100" suffix in the part number. This value is guaranteed with ±30% device-to-device tolerance and ±1% channel-to-channel matching at +25°C. The resistance exhibits a 700 ppm/°C temperature coefficient in rheostat mode, and the wiper resistance is typically 45 Ω.

How does the AD5203ARU100 handle power-down states?

When the SHDN pin is driven low, the AD5203ARU100 places all A terminals in open-circuit condition and shorts each wiper (W1–W4) to its corresponding B terminal, achieving a microwatt shutdown state with supply current ≤5 µA. Crucially, the internal RDAC latches retain their last programmed values, so resistance settings are restored immediately upon returning SHDN to high.

Can multiple AD5203ARU100 devices be controlled from a single microcontroller SPI port?

Yes - the AD5203ARU100 features an open-drain SDO pin that enables daisy-chaining. By connecting the SDO of one device to the SDI of the next and holding CS low during full 32-bit (4 × 8-bit) transmission, a single SPI port can configure up to four AD5203ARU100 devices. Each device uses its own A1/A0 address bits to decode which RDAC latch receives the subsequent 6-bit data.

What is the function of the RS pin on the AD5203ARU100?

The RS (Reset) pin on the AD5203ARU100 is an active-low input that forces all four RDAC latches to load the hexadecimal value 20H (decimal 32), positioning each wiper at midscale (50% of R_AB). This provides deterministic startup behavior and simplifies system initialization. Unlike SHDN, RS does not affect power consumption or terminal connectivity - it only updates latch contents.

Does the AD5203ARU100 support both rheostat and potentiometer divider configurations?

Yes - the AD5203ARU100 supports both configurations. In rheostat mode (e.g., A–W or B–W), it functions as a two-terminal variable resistor with 100 kΩ maximum resistance and 700 ppm/°C tempco. In potentiometer divider mode (A–B–W), it generates a ratiometric output voltage with significantly improved 20 ppm/°C tempco, making it ideal for precision voltage scaling applications.