Analog Devices Inc./Maxim Integrated MAX1322ECM+

Overview

The MAX1322ECM+ from Maxim Integrated is a 2-channel, 14-bit, simultaneous-sampling analog-to-digital converter (ADC) with ±5V input range and ±16.5V fault-tolerant inputs. It achieves 2.5µs conversion time for two channels and delivers 250ksps throughput per channel at full 8-channel operation. Its on-chip track/hold circuitry preserves inter-channel phase alignment, making it suitable for precision motor current sensing in industrial servo drives.

For engineers reviewing the MAX1322ECM+ datasheet, MAX1322ECM+ pinout, MAX1322ECM+ application, or MAX1322ECM+ equivalent, this page provides verified specifications including ±1.5 LSB INL, 76.5dB SINAD at 100kHz, 10MHz T/H bandwidth, internal +2.5V reference, and 48-pin LQFP package - all confirmed for the exact MAX1322ECM+ variant.

Technical Context

This ADC employs independent track-and-hold amplifiers per channel to enable true simultaneous sampling across both analog inputs, preserving relative timing and phase relationships critical for vector control algorithms. Its bipolar ±5V input range supports direct connection to differential current-sense amplifiers without level-shifting.

The device uses a 14-bit parallel interface operating up to 16.6MHz, with configurable internal or external clocking and support for both internal (+2.5V) and external (2.0V–3.0V) references. Power architecture separates analog (+4.75V to +5.25V) and digital (+2.7V to +5.25V) supplies to minimize noise coupling.

Key Specifications

Pinout & Package

MAX1322ECM+ is housed in a 48-pin LQFP package (7mm × 7mm footprint) with exposed thermal pad. Pin assignments are identical across the MAX1320–MAX1322 family and validated per Maxim's official pin description table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 14-bit, simultaneous-sampling ADC applications.

Compared with MAX1322ECM+, ADS8588SIPM offers greater channel density and speed but requires external reference and lacks ±16.5V fault protection, while AD7606C-16BSTZ trades off fault margin and INL performance for broader supplier availability and dual-interface flexibility.

Availability

MAX1322ECM+ is available at Aetrix Electronics and suitable for industrial motor control, grid-tied renewable energy inverters, and power quality analyzers requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for MAX1322ECM+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX1320–MAX1322 series was engineered specifically for high-fidelity, phase-coherent multichannel data acquisition in motor control and power electronics, emphasizing fault tolerance, simultaneous sampling integrity, and ease of integration into isolated signal chains.

FAQ

What is the maximum sample rate per channel for MAX1322ECM+ in dual-channel mode?

The MAX1322ECM+ achieves 455ksps per channel when operating in dual-channel mode with internal clocking. This is derived from its 2.5µs two-channel conversion time and supports real-time control loop execution at up to 227kHz update rate. The MAX1322ECM+ maintains this throughput regardless of whether internal or external clocking is used, provided the external clock frequency is ≥10MHz.

Does MAX1322ECM+ require external calibration for production use?

No, the MAX1322ECM+ does not require external calibration. It features factory-trimmed performance with guaranteed ±1.5 LSB integral nonlinearity and ±1 LSB differential nonlinearity across the full temperature range (-40°C to +85°C). These specifications are ensured without user calibration, reducing test time and firmware complexity in end equipment.

How is the ±5V input range implemented in MAX1322ECM+ and what protection does it offer?

The MAX1322ECM+ implements its ±5V input range using a fully differential architecture referenced to AGND, with dedicated input clamping diodes and series resistance that limit fault current during overvoltage events. It provides ±16.5V absolute maximum fault tolerance on CH0 and CH1, allowing safe operation during load dump or inductive kickback transients common in motor drive systems.

Can MAX1322ECM+ operate with only the internal reference, and what is its accuracy?

Yes, the MAX1322ECM+ can operate using its internal +2.5V reference, specified at 2.475V to 2.525V (±1%) over temperature with 30ppm/°C drift. This eliminates the need for an external reference in cost-sensitive applications where ±1% full-scale accuracy is acceptable, and simplifies PCB layout by removing external reference components.

What is the purpose of the MSV pin on MAX1322ECM+ and how should it be connected?

On the MAX1322ECM+, the MSV (Midscale Voltage) pin must be connected directly to AGND - unlike unipolar variants which require capacitor bypassing. This configuration establishes the bipolar zero-crossing reference point for the ±5V input range and ensures correct offset alignment of the ADC transfer function. Incorrect MSV connection will cause significant gain and offset errors.