Analog Devices Inc./Maxim Integrated MAX1248BEEE+T

Overview

MAX1248BEEE+T from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply and achieves 133ksps conversion rate with 1.2mA supply current at +3V - optimized for portable data logging and battery-powered instrumentation.

For engineers reviewing the MAX1248BEEE+T datasheet, MAX1248BEEE+T pinout, MAX1248BEEE+T application, or MAX1248BEEE+T equivalent, this page delivers verified technical context, real-world timing behavior, confirmed package mapping to QSOP-16, validated pin functions, and two rigorously cross-checked alternative ADCs for low-power, serial-interface 10-bit acquisition systems.

Technical Context

The MAX1248BEEE+T uses successive-approximation architecture with an internal capacitive DAC and track/hold circuitry that acquires input signals in ≤1.5µs. Its analog front-end supports pseudo-differential sampling via CH0–CH3 and COM, with channel selection and mode configuration (unipolar/bipolar, single-ended/differential) controlled entirely through an 8-bit serial command word.

It features dual clock modes: external SCLK-driven conversion (with SSTRB strobe synchronized to MSB decision) or internal clock mode (SSTRB asserts low for ≤7.5µs, enabling flexible readout timing). The internal 2.5V reference has ±1.5% adjustment range via REFADJ and ±30ppm/°C temperature coefficient - buffered and stable across VDD = 2.7V to 5.25V.

Key Specifications

Pinout & Package

MAX1248BEEE+T is housed in a 16-pin QSOP package (3.9mm × 4.9mm footprint, same board area as 8-pin SO), optimized for space-constrained portable designs.

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+T uniquely balances ultra-low standby current (1µA), internal reference adjustability (±1.5%), and QSOP-16 compatibility - making it optimal for cost-sensitive, battery-operated systems requiring field recalibration and long service life.

Availability

MAX1248BEEE+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for MAX1248BEEE+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and portable applications.

The MAX1248/MAX1249 product line was designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing integrated functionality (MUX, T/H, reference, serial interface) to reduce system-level component count.

FAQ

What is the maximum sampling rate achievable with MAX1248BEEE+T?

The MAX1248BEEE+T achieves a maximum conversion rate of 133ksps when using a 2MHz external serial clock and 15 clock cycles per conversion. This rate is maintained across its full operating temperature range (0°C to +70°C) and supply voltage range (+2.7V to +5.25V). At lower clock frequencies or in internal clock mode, the effective sampling rate decreases accordingly - for example, 1ksps operation draws only 54µA from a +3V supply, enabling extended battery life in portable applications. The MAX1248BEEE+T's timing is fully characterized in the datasheet's Timing Characteristics table.

Does MAX1248BEEE+T require an external reference voltage?

No, the MAX1248BEEE+T includes an internal 2.500V reference with ±1.5% adjustment range via the REFADJ pin and ±30ppm/°C temperature coefficient - eliminating the need for an external reference IC in most applications. This internal reference is enabled by default and bypassed with a 4.7µF capacitor on the VREF pin. In contrast, the pin-compatible MAX1249 variant requires an external reference. The MAX1248BEEE+T's reference buffer can be disabled by tying REFADJ to VDD, allowing use of an external reference if higher precision or different voltage is needed.

How does the SHDN pin function on MAX1248BEEE+T?

The SHDN pin on MAX1248BEEE+T provides three-level control: pulling it low places the device in full power-down mode (1µA supply current); pulling it high configures the reference buffer for internal compensation; letting it float selects external compensation mode for REFADJ adjustment. Unlike simple enable/disable pins, SHDN directly affects reference buffer topology and power state - and critically, serial interface activity (CS low or DIN/SCLK transitions) automatically wakes the device from power-down. This behavior is confirmed in the Pin Description and Electrical Characteristics sections of the MAX1248BEEE+T datasheet.

Can MAX1248BEEE+T perform differential measurements?

Yes, the MAX1248BEEE+T supports true pseudo-differential measurements using CH0/CH1 and CH2/CH3 input pairs, configured via the SGL/DIF bit in the 8-bit serial control word. In differential mode, the device samples the voltage difference |IN+ − IN−|, with IN− required to remain stable within ±0.5LSB relative to AGND during conversion. A 0.1µF capacitor from the selected IN− channel to AGND is recommended to maintain stability. Differential mode is explicitly supported in Tables 2 and 3 of the MAX1248BEEE+T datasheet and delivers the same ±0.5 LSB INL performance as single-ended operation.

What package type is used for MAX1248BEEE+T?

The MAX1248BEEE+T is supplied in a 16-pin QSOP (Quarter-Size Outline Package) with 0.65mm lead pitch, measuring 3.9mm × 4.9mm - identical in footprint area to an industry-standard 8-pin SOIC. This compact, surface-mount package is explicitly listed in the Ordering Information table of the MAX1248BEEE+T datasheet and is distinct from the 16-pin plastic DIP variants (e.g., MAX1248BCPE). The QSOP-16 package enables high-density PCB layouts while maintaining hand-solderability and compatibility with standard reflow profiles.