Analog Devices Inc./Maxim Integrated MAX1303BEUP+T

Overview

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

For engineers reviewing the MAX1303BEUP+T datasheet, MAX1303BEUP+T pinout, MAX1303BEUP+T application, or MAX1303BEUP+T equivalent, key selection considerations include its 20-pin TSSOP package, internal +4.096V reference (±1%), ±1.0 LSB INL (typ), partial power-down mode (1.3mA), and full power-down mode (1µA).

Technical Context

The MAX1303BEUP+T implements a fully differential SAR architecture with integrated track-and-hold, supporting both unipolar and bipolar configurations across seven single-ended and three differential input ranges. Its analog front-end includes ±6V fault-tolerant inputs and programmable channel-specific gain/offset settings via SPI-configurable registers.

It uses four independent power domains-AVDD1/AGND1 (analog core), AVDD2/AGND2 (preamplifier), DVDD/DGND (digital logic), and DVDDO/DGNDO (I/O)-with dedicated bypassing to minimize noise coupling. Reference operation is selectable between internal +4.096V (±30ppm/°C TC) and external 3.800V–4.136V sources.

Key Specifications

Pinout & Package

MAX1303BEUP+T is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch), optimized for thermal performance and PCB area efficiency in high-density industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8684IPW and AD7606BSTZ, the MAX1303BEUP+T uniquely combines per-channel software-programmable input ranges, ±6V overvoltage tolerance, and ultra-low 1µA full power-down current in a compact 20-pin TSSOP-making it optimal for battery-powered, space-constrained industrial sensors where flexibility and robustness outweigh raw channel count or sample rate.

Availability

MAX1303BEUP+T is available at Aetrix Electronics and suitable for industrial control systems, data-acquisition systems, avionics, and robotics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

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

The MAX1303BEUP+T belongs to Maxim's high-accuracy, low-power SAR ADC product line, engineered specifically for multichannel, multirange data acquisition in harsh environments where signal integrity, fault resilience, and supply flexibility are critical.

FAQ

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

The MAX1303BEUP+T achieves a maximum sample rate of 115ksps in external clock mode with fCLK = 3.5MHz and VREF = 4.096V. This rate applies to single-ended conversions using the maximum bipolar input range (±VREF). Performance remains stable across the full -40°C to +85°C operating temperature range, with typical SINAD of 88dB at this rate.

Does the MAX1303BEUP+T support both single-ended and differential input configurations, and how are they selected?

Yes, the MAX1303BEUP+T supports four single-ended or two true-differential analog inputs. Configuration is controlled per channel via the DIF/SGL bit in the analog input configuration byte sent over SPI. When DIF/SGL = 0, the selected channel is referenced to AGND1; when DIF/SGL = 1, differential pairs (e.g., CH0–CH1) are formed, enabling rejection of common-mode noise in motor current sensing.

What is the accuracy specification of the MAX1303BEUP+T, and how does it vary between grade versions?

The MAX1303BEUP+T has a maximum integral nonlinearity (INL) of ±4 LSB (typical ±1.0 LSB) and guaranteed no missing codes. This B-grade accuracy is tighter than the A-grade (±2 LSB max) but less stringent than C-grade devices. The specification is validated across the full operating temperature range and applies to all supported input ranges when using either internal or external reference.

How does the internal reference of the MAX1303BEUP+T compare to external reference options in terms of stability and accuracy?

The MAX1303BEUP+T internal reference provides +4.096V ±1% (±41mV) initial accuracy and ±30ppm/°C temperature coefficient. External references between 3.800V and 4.136V offer higher initial accuracy (e.g., REF5040: ±0.05%) but require additional board space and cost. Internal reference operation simplifies design and reduces BOM count while meeting most industrial calibration requirements.

Can the MAX1303BEUP+T operate with different supply voltages for analog and digital sections, and what are the valid ranges?

Yes, the MAX1303BEUP+T features four independent supply domains: AVDD1 and AVDD2 accept +4.75V to +5.25V for analog circuitry; DVDD accepts +4.75V to +5.25V for digital logic; DVDDO accepts +2.7V to +5.25V for I/O interfacing. This allows direct connection to 3.3V microcontrollers while maintaining 5V analog performance, with each supply requiring local 0.1µF bypassing to its respective ground.