Analog Devices Inc./Maxim Integrated MAX1248BEEE

Overview

MAX1248BEEE from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and internal 2.5V reference. It operates from a single +2.7V to +5.25V supply, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and achieves 133ksps conversion rate using internal or external clocking. It is used in portable data loggers for battery-efficient, precision signal digitization of sensor outputs.

For engineers reviewing the MAX1248BEEE datasheet, MAX1248BEEE pinout, MAX1248BEEE application, or MAX1248BEEE equivalent, key selection considerations include its QSOP-16 package, 1.2mA active current at 133ksps, ±1 LSB INL, SPI/QSPI/MICROWIRE compatibility, and shutdown current below 1µA - all critical for low-power embedded sensing systems.

Technical Context

The MAX1248BEEE employs successive-approximation register (SAR) architecture with an integrated track/hold circuit that acquires input signals within 1.5µs. Its analog front-end supports four single-ended or two pseudo-differential input pairs (CH0/CH1, CH2/CH3), with COM pin defining common-mode reference and ±0.5LSB stability requirement.

It features dual clock modes: internal clock (freeing host MCU from timing constraints) and external clock (enabling precise synchronization up to 2MHz). The 4-wire serial interface uses SCLK, DIN, DOUT, and CS, with SSTRB providing strobe feedback for conversion status - directly compatible with TMS320-family DSPs without glue logic.

Key Specifications

Pinout & Package

The MAX1248BEEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm), occupying the same PCB footprint as an 8-pin SOIC - enabling compact, high-density layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit serial ADC applications.

Compared with ADS7822U and MAX11100ETE+, the MAX1248BEEE uniquely balances 10-bit precision, ultra-low shutdown current (1µA), integrated reference, and QSOP-16 footprint - making it optimal for space- and power-constrained portable instrumentation where 133ksps suffices.

Availability

MAX1248BEEE is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply across extended production lifecycles.

Supply support for MAX1248BEEE 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, medical, and communications applications.

The MAX1248BEEE belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated and space-constrained data acquisition systems requiring integrated reference and flexible input configuration.

FAQ

What is the operating temperature range for the MAX1248BEEE?

The MAX1248BEEE is rated for 0°C to +70°C ambient operation, as indicated by the "B" grade suffix in its ordering code. This commercial-grade temperature range is validated across all electrical specifications including INL (±1 LSB), supply current (1.2mA typical at 133ksps), and reference voltage stability (±30ppm/°C). The device maintains full functionality within this range without derating.

Does the MAX1248BEEE require external components for stable reference operation?

Yes - the MAX1248BEEE requires a 4.7µF capacitor at the VREF pin for internal reference stability, as specified in the Typical Operating Circuit and Electrical Characteristics tables. This capacitor suppresses noise and ensures ±1.5% reference accuracy over temperature and load. Additionally, a 0.01µF capacitor is recommended at REFADJ for adjustment filtering. These values are mandatory for achieving datasheet performance.

How does the SHDN pin function in the MAX1248BEEE?

The SHDN pin on the MAX1248BEEE implements three distinct power states: pulled low → full power-down (<1µA supply current); pulled high → internal reference compensation mode; left floating → external compensation mode. Unlike simple enable/disable pins, SHDN directly configures the reference-buffer amplifier's compensation network, affecting VREF stability and startup time - a unique feature confirmed in the Pin Description and Detailed Description sections.

Can the MAX1248BEEE interface directly with a TMS320 DSP without level-shifting?

Yes - the MAX1248BEEE's SSTRB output is designed for direct connection to TMS320-family DSPs. Its logic levels (VOH ≥ VDD – 0.5V, VOL ≤ 0.4V) and timing (SSTRB pulse aligns with MSB decision in external clock mode) meet TMS320 interface requirements. No level-shifter is needed when both devices share the same VDD rail (e.g., +3.3V), as verified in the Electrical Characteristics and Typical Operating Circuit.

What is the minimum acquisition time required for accurate conversions on the MAX1248BEEE?

The MAX1248BEEE requires a minimum acquisition time (tACQ) of 1.5µs, as guaranteed across all operating conditions. This value is independent of source impedance below 3kΩ and ensures full 10-bit settling. If source impedance exceeds 3kΩ, tACQ increases per the formula tACQ = 7.6 × (RS + 9kΩ) × 16pF - meaning external input capacitance (e.g., 0.01µF) may be needed to maintain accuracy at higher impedances.