Analog Devices Inc./Maxim Integrated MAX1248AEEE+

Overview

MAX1248AEEE+ 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 sensor digitization.

For engineers reviewing the MAX1248AEEE+ datasheet, MAX1248AEEE+ pinout, MAX1248AEEE+ application, or MAX1248AEEE+ equivalent, this page delivers verified electrical specs, QSOP-16 package details, SPI/QSPI/MICROWIRE-compatible interface behavior, shutdown power management, and real-world use context - all confirmed against Maxim's official 19-1072 Rev 2 datasheet.

Technical Context

The MAX1248AEEE+ employs successive-approximation register (SAR) architecture with an integrated track/hold circuit that acquires input signals in ≤1.5µs. Its analog front-end supports four single-ended or two pseudo-differential input pairs (CH0/CH1, CH2/CH3), with COM pin establishing zero-code reference in single-ended mode.

It features dual clock modes: internal clock (7.5µs max conversion time, SHDN = FLOAT) or external SCLK-driven operation (15 clocks/conversion at 2MHz). The device includes a reference-buffer amplifier with ±1.5% REFADJ adjustment range and hard-wired SHDN pin enabling full power-down (<1µA) or fast power-down (54µA at 1ksps).

Key Specifications

Pinout & Package

MAX1248AEEE+ is housed in a 16-pin QSOP package (same board footprint as 8-pin SO), optimized for space-constrained portable instrumentation. Pin functions are validated per Maxim's Pin Description section (Rev 2, p.7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1249AEEE+, the MAX1248AEEE+ reduces BOM count by integrating the reference, while ADS7822U trades off power efficiency and strobe support for higher resolution - making MAX1248AEEE+ optimal for compact, low-power, reference-free 10-bit systems.

Availability

MAX1248AEEE+ is available at Aetrix Electronics and suitable for portable data logging, medical instruments, and battery-powered instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1248AEEE+ 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 portable applications.

The MAX1248/MAX1249 product line targets low-power, multi-channel data acquisition in space- and energy-constrained systems - delivering integrated signal conditioning, reference, and serial interface in minimal footprint.

FAQ

What is the reference voltage source for MAX1248AEEE+?

The MAX1248AEEE+ integrates a factory-trimmed 2.500V ±0.3% internal reference buffer, accessible at the VREF pin. This eliminates the need for an external reference IC. The REFADJ pin allows ±1.5% fine adjustment of the output; tying REFADJ to VDD disables the buffer for external reference use - though MAX1248AEEE+ is specified for internal reference operation.

Does MAX1248AEEE+ support differential input mode?

Yes, MAX1248AEEE+ supports pseudo-differential input mode using two channel pairs: CH0/CH1 and CH2/CH3. In this mode, the device samples the voltage difference |IN+ − IN−|, with IN− required to remain stable within ±0.5LSB of AGND. Configuration is done via the SGL/DIF bit (bit 2) and SEL2–SEL0 bits in the 8-bit control byte.

How does the SHDN pin function on MAX1248AEEE+?

The SHDN pin on MAX1248AEEE+ is a three-level control: pulled low → full power-down (<1µA); floated → external compensation mode (4.7µF cap at VREF); pulled high → internal compensation mode (0µF cap at VREF). It is hard-wired and does not require software configuration - enabling deterministic, hardware-initiated sleep states independent of serial interface activity.

What is the maximum sampling rate achievable with MAX1248AEEE+?

The MAX1248AEEE+ achieves a maximum sampling rate of 133ksps using a 2MHz external serial clock and 15-clock conversion cycle. In internal clock mode, conversion time is fixed at ≤7.5µs (SHDN = FLOAT), allowing flexible readout timing but limiting sustained throughput to ~133ksps under continuous operation due to acquisition and overhead constraints.

Is MAX1248AEEE+ pin-compatible with other variants in the MAX1248 family?

Yes, MAX1248AEEE+ is pin-compatible with all MAX1248 variants in QSOP-16 packaging (e.g., MAX1248BCEE+, MAX1248ACEE+), sharing identical pinout, electrical characteristics, and timing. Temperature grade differences (A = 0°C to +70°C) do not affect mechanical or functional compatibility - only operating range and tested parameter limits.