Analog Devices Inc./Maxim Integrated MAX1303BEUP+

Overview

MAX1303BEUP+ from Maxim Integrated is a 16-bit successive-approximation analog-to-digital converter (ADC) with four single-ended or two differential analog input channels, ±6V overvoltage tolerance, software-programmable input ranges (±VREF/4 to ±2×VREF), and 115ksps maximum throughput. It operates from a single +5V analog supply and supports digital interfacing at 2.7V–5.25V via SPI/QSPI/MICROWIRE-compatible serial interface, targeting precision data acquisition in industrial control and avionics.

For engineers reviewing the MAX1303BEUP+ datasheet, MAX1303BEUP+ pinout, MAX1303BEUP+ application, or MAX1303BEUP+ equivalent, key selection considerations include its multirange bipolar/unipolar programmability per channel, internal +4.096V reference with ±30ppm/°C drift, 20-pin TSSOP package, -40°C to +85°C temperature rating, and partial/full power-down modes reducing current to 1.3mA/1µA.

Technical Context

The MAX1303BEUP+ implements a fully differential SAR architecture with integrated track-and-hold, supporting both single-ended and true differential conversions. Its analog front-end includes fault-tolerant ±6V inputs, programmable gain/offset per channel, and independent configuration of input range (seven unipolar/bipolar options) and mode (DIF/SGL) via an 8-bit configuration byte.

It features four dedicated analog supply domains (AVDD1/AGND1, AVDD2/AGND2, AGND3, REF/REFCAP) and dual digital supplies (DVDD/DGND, DVDDO/DGNDO) to isolate noise-sensitive sections. The internal reference buffer allows seamless switching between internal +4.096V and external 3.800V–4.136V references, with REFCAP threshold detection enabling automatic mode selection.

Key Specifications

Pinout & Package

The MAX1303BEUP+ is housed in a 20-pin thin shrink small-outline package (TSSOP) with exposed pad, optimized for thermal performance and PCB space efficiency in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit multichannel SAR ADC applications.

Compared with ADS8684IPWR and AD7606BSTZ, the MAX1303BEUP+ offers unique value in space-constrained, low-power industrial nodes requiring robust ±6V input protection, flexible per-channel range programming, and minimal external components-without sacrificing 16-bit accuracy or 115ksps throughput.

Availability

MAX1303BEUP+ is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor interfaces, and robotics joint feedback requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1303BEUP+ 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX1303BEUP+ belongs to Maxim's high-accuracy SAR ADC product line, engineered for multichannel data acquisition systems requiring software-configurable input ranges, fault tolerance, and low-power operation in harsh environments.

FAQ

What is the maximum sample rate of the MAX1303BEUP+ and under what conditions is it achieved?

The MAX1303BEUP+ achieves a maximum sample rate of 115ksps in external clock mode with fCLK = 3.5MHz and VREF = 4.096V. This rate applies to both single-ended and differential configurations across all supported input ranges. Performance remains stable over the full -40°C to +85°C operating temperature range, with typical SINAD of 88dB at 5kHz input frequency under these conditions.

Does the MAX1303BEUP+ include an internal voltage reference, and what are its specifications?

Yes, the MAX1303BEUP+ integrates an internal +4.096V bandgap reference with ±1% initial accuracy (4.056V to 4.136V) and ±30ppm/°C temperature coefficient. It is enabled by bypassing the REF pin with a 1.0µF capacitor to AGND1 and the REFCAP pin with a 0.01µF capacitor to AGND1. The device also supports external references from 3.800V to 4.136V.

How many analog input channels does the MAX1303BEUP+ support, and what configurations are available?

The MAX1303BEUP+ supports four analog input channels (CH0–CH3), configurable as either four single-ended inputs or two true differential pairs (CH0–CH1 and CH2–CH3). Each channel is independently programmable for input range and polarity via an 8-bit configuration byte sent over the SPI interface, enabling mixed-mode acquisition within a single conversion sequence.

What power supply requirements does the MAX1303BEUP+ have, and how are they partitioned?

The MAX1303BEUP+ requires four isolated supply domains: AVDD1 (4.75V–5.25V, 3mA typ) for core ADC, AVDD2 (4.75V–5.25V, 17.5mA typ) for preamplifier, DVDD (4.75V–5.25V, 0.9mA typ) for digital logic, and DVDDO (2.7V–5.25V, 0.2mA typ) for I/O drivers. All corresponding grounds (AGND1/AGND2/AGND3/DGND/DGNDO) must be connected at a single point near the device.

Is the MAX1303BEUP+ pin-compatible with other devices in the MAX130x family, such as the MAX1303AEUP+?

Yes, the MAX1303BEUP+ is pin-compatible with the MAX1303AEUP+ and all MAX130x variants in the 20-pin TSSOP package. Both share identical pinout, electrical characteristics, and functional behavior, differing only in guaranteed INL specification (±2 LSB for MAX1303AEUP+, ±4 LSB for MAX1303BEUP+), making them drop-in replacements where the tighter INL spec is not required.