Analog Devices Inc./Maxim Integrated MAX5415EUD+T

Overview

MAX5415EUD+T from Maxim Integrated is a dual, 256-tap, 100kΩ digital potentiometer in 14-pin TSSOP packaging, operating from +2.7V to +5.5V with ultra-low 0.1µA supply current. It features glitchless wiper switching, power-on reset to midscale (position 128), and 3-wire SPI-compatible serial interface. Used as digitally programmable resistors in precision gain control and voltage reference circuits.

For engineers reviewing the MAX5415EUD+T datasheet, MAX5415EUD+T pinout, MAX5415EUD+T application, or MAX5415EUD+T equivalent, key selection criteria include end-to-end resistance (100kΩ), ratiometric tempco (5ppm/°C), wiper settling time (650ns), dual independent potentiometer architecture, and guaranteed operation over –40°C to +85°C.

Technical Context

The MAX5415EUD+T integrates two independent 3-terminal digital potentiometers, each with 256 linear-taper tap points controlled via a 9-bit serial word (1 address + 8 data bits). Address bit A0 selects Pot A (A0 = 0) or Pot B (A0 = 1), enabling independent programming without inter-channel interference.

Each potentiometer supports both voltage-divider and variable-resistor configurations. Its BiCMOS process delivers low 35ppm/°C end-to-end tempco and ultra-stable 5ppm/°C ratiometric tempco-critical for gain- and reference-setting applications where resistor ratio stability dominates absolute value drift.

Key Specifications

Pinout & Package

Package: 14-pin TSSOP (thin shrink small-outline package), 5.0mm × 4.4mm × 1.2mm body, 0.65mm lead pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP42100-E/ST, the MAX5415EUD+T offers superior ratiometric tempco (5ppm/°C vs. ≥150ppm/°C), ultra-low quiescent current (0.1µA vs. ≥5µA), and guaranteed POR-making it uniquely suitable for high-stability, low-power, and safety-critical calibration tasks.

Availability

MAX5415EUD+T is available at Aetrix Electronics and suitable for precision gain control, adjustable voltage references, LCD biasing, and programmable filter design requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX5415EUD+T 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and consumer applications.

The MAX5413/MAX5414/MAX5415 family was engineered specifically for digitally programmable precision resistance in gain-setting, reference-adjustment, and calibration circuits demanding low drift and robust serial control.

FAQ

What is the maximum clock frequency supported by the MAX5415EUD+T serial interface?

The MAX5415EUD+T supports a maximum SCLK frequency of 10MHz, enabling fast wiper updates with minimal latency. This timing specification is guaranteed over the full –40°C to +85°C operating range and ensures reliable communication with modern microcontrollers and FPGAs without requiring clock dividers or additional synchronization logic in the MAX5415EUD+T interface path.

Does the MAX5415EUD+T include power-on reset functionality?

Yes, the MAX5415EUD+T incorporates internal power-on reset (POR) circuitry that automatically sets both wiper positions to midscale (tap 128) at power-up. This behavior is guaranteed across the full supply voltage ramp range (+2.7V to +5.5V) and eliminates the need for external reset sequencing or host-initiated initialization before first-use operation of the MAX5415EUD+T.

Can the MAX5415EUD+T operate from a 3.3V supply?

Yes, the MAX5415EUD+T is fully specified for operation from +2.7V to +5.5V, including standard 3.3V systems. At VDD = +3.3V, it maintains 256-tap resolution, glitchless switching, and 5ppm/°C ratiometric tempco performance. Supply current drops to 0.1µA, making the MAX5415EUD+T ideal for low-voltage, low-power embedded designs.

What is the wiper resistance specification for the MAX5415EUD+T?

The MAX5415EUD+T specifies a typical wiper resistance (RW) of 550Ω at VDD = +3V and 275Ω at VDD = +5V. This parameter directly impacts insertion loss and loading effects in variable-resistor mode; designers must account for RW when calculating effective resistance in series configurations or when driving high-impedance nodes with the wiper output of the MAX5415EUD+T.

How are the two potentiometers in the MAX5415EUD+T addressed independently?

The MAX5415EUD+T uses a 9-bit serial command format where the MSB (A0) serves as the potentiometer address bit: A0 = 0 selects Pot A (pins HA, LA, WA), and A0 = 1 selects Pot B (pins HB, LB, WB). The remaining 8 bits (D7–D0) set the wiper position. This addressing scheme allows full independent control of both 100kΩ potentiometers using a single 3-wire SPI bus without external decoding logic for the MAX5415EUD+T.