Analog Devices Inc./Maxim Integrated MAX1377ATP+T

Overview

MAX1377ATP+T from Maxim Integrated is a dual, simultaneous-sampling, 12-bit SAR ADC with SPI/QSPI/MICROWIRE/DSP-compatible serial interface and internal 2.048V reference. It operates from 2.7V–3.6V analog supply, delivers 1.25Msps per channel, achieves 70dB SINAD and 84dBc SFDR at 500kHz input, and targets high-precision industrial process control and motor control systems requiring synchronized sampling of two analog signals.

For engineers reviewing the MAX1377ATP+T datasheet, MAX1377ATP+T pinout, MAX1377ATP+T application, or MAX1377ATP+T equivalent, this page provides verified technical context, exact pin functions, real-world use cases in motor feedback and sensor acquisition, and validated alternative options for dual-channel 12-bit simultaneous ADC selection.

Technical Context

The MAX1377ATP+T implements two independent successive approximation register (SAR) ADCs sharing a common conversion timing engine, enabling true simultaneous sampling with ≤2ns aperture-delay matching. Its dual-output serial interface supports independent DOUT1/DOUT2 streams at up to 1.25Msps or single-output mode at 0.625Msps, eliminating inter-channel skew in closed-loop control.

It features programmable unipolar (0–VREF) or bipolar (±VREF/2) input ranges per channel, selectable via U/B pin, with 34kΩ input impedance and 16pF input capacitance. Power management includes partial power-down (2mA I_AVDD) and full power-down (1µA I_AVDD) modes, optimized for low-duty-cycle acquisition in battery-sensitive applications.

Key Specifications

Pinout & Package

MAX1377ATP+T is housed in a 20-pin TQFN-EP (4mm × 4mm, 0.5mm pitch) with exposed pad for thermal dissipation, rated for -40°C to +125°C automotive operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel 12-bit simultaneous ADC applications.

Compared with ADS8325IPW and AD7327BRUZ, the MAX1377ATP+T uniquely delivers guaranteed simultaneous sampling with <2ns matching, integrated 2.048V reference, and ultra-low 3µW full power-down-making it optimal for space-constrained, thermally sensitive motor control and portable instrumentation where timing integrity and power efficiency are non-negotiable.

Availability

MAX1377ATP+T is available at Aetrix Electronics and suitable for industrial process control, motor control, and RF signal monitoring requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.

Supply support for MAX1377ATP+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 MAX1377ATP+T belongs to Maxim's high-performance data acquisition product line, engineered specifically for applications requiring synchronized dual-channel sampling, low power, and robust operation in harsh environments.

FAQ

What is the maximum sampling rate supported by the MAX1377ATP+T?

The MAX1377ATP+T supports a maximum sampling rate of 1.25Msps per ADC channel in dual-output mode. This rate is achieved with a 20MHz SCLK and 16-clock-cycle conversion time. In single-output mode, the maximum throughput is reduced to 0.625Msps due to serialized data transfer. The device maintains full linear bandwidth (1MHz) only above 10ksps sample rates.

Does the MAX1377ATP+T include an internal voltage reference?

Yes, the MAX1377ATP+T integrates a precision 2.048V internal voltage reference with ±10mV initial accuracy and ±50ppm/°C temperature coefficient. When REFSEL is driven low, the internal reference is enabled and appears at the REF pin, requiring a ≥1µF capacitor to RGND for stability. This eliminates the need for an external reference in most applications.

How does the MAX1377ATP+T handle simultaneous sampling across its two ADCs?

The MAX1377ATP+T guarantees true simultaneous sampling via a shared track-and-hold circuit and matched aperture delay paths. Electrical specifications confirm ≤2ns aperture-delay matching between channels, ensuring phase-coherent acquisition critical for motor control and I/Q demodulation. The CNVST pin triggers both ADCs identically on the falling edge.

What power-saving modes are available on the MAX1377ATP+T?

The MAX1377ATP+T offers two power-saving modes: partial power-down (2mA I_AVDD, reference active for fast wake-up) and full power-down (1µA I_AVDD, reference disabled). Both are controlled via the CNVST pin sequence. Full power-down reduces total supply current to microamp levels, ideal for duty-cycled sensor nodes and portable instruments.

Can the MAX1377ATP+T interface directly with 1.8V logic systems?

Yes, the MAX1377ATP+T supports a separate digital supply VL from 1.8V to AVDD, enabling direct interfacing with 1.8V, 2.5V, or 3.3V logic without level translators. Digital inputs accept 0.3×VL (low) and 0.7×VL (high) thresholds, and DOUT pins drive VOH = VL − 0.5V and VOL = 0.4V, ensuring reliable communication across mixed-voltage systems.