Analog Devices Inc./Maxim Integrated MAX1309ECM/V+T

Overview

MAX1309ECM/V+T from Maxim Integrated is a 12-bit, 4-channel simultaneous-sampling analog-to-digital converter (ADC) with ±5V input range and ±16.5V fault-tolerant inputs. It achieves 0.9μs two-channel conversion time, 901ksps per channel throughput with external clock, and features internal 2.5V reference, 20MHz T/H bandwidth, and 48-pin LQFP package. It is designed for high-precision multiphase motor control and power-grid synchronization systems requiring channel-to-channel coherence.

For engineers reviewing the MAX1309ECM/V+T datasheet, MAX1309ECM/V+T pinout, MAX1309ECM/V+T application, or MAX1309ECM/V+T equivalent, this page delivers verified specifications including ±1 LSB INL, 84dBc SFDR at 500kHz, 100ps channel-to-channel T/H match, and fault-tolerant analog input protection - all critical for industrial motor drive and power monitoring design validation.

Technical Context

The MAX1309ECM/V+T implements independent track-and-hold circuitry per channel to enable true simultaneous sampling across all four analog inputs. Its bipolar ±5V input range is supported by dedicated internal biasing and reference architecture, including REF+, REF-, COM, and MSV terminals configured for differential reference generation and midscale setting.

Conversion timing is governed by either internal 15MHz clock or user-supplied external clock up to 20MHz; EOC and EOLC signals provide precise conversion status indication, while parallel 12-bit bus (D0–D11) supports high-speed data readout with 30ns access time and tri-state control via RD/CS.

Key Specifications

Pinout & Package

MAX1309ECM/V+T is housed in a 48-pin 7mm × 7mm LQFP package with exposed thermal pad (RoHS-compliant, lead-free). Pin functions are validated per Maxim's official datasheet Rev 6 (19-3052), with dedicated analog/digital ground separation (AGND/DGND), fault-tolerant input pins (CH0–CH3), and full 12-bit parallel data bus (D0–D11).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7357BCPZ and ADS8588SIPM, the MAX1309ECM/V+T uniquely balances 4-channel simultaneity, ±5V native input, integrated reference, and compact 48-pin LQFP - making it optimal for cost-sensitive, space-constrained motor control modules where channel count and fault tolerance are fixed requirements.

Availability

MAX1309ECM/V+T is available at Aetrix Electronics and suitable for multiphase motor control, power-grid synchronization, and vibration analysis applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX1309ECM/V+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 and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on high-reliability, low-power, and signal-integrity-critical applications.

The MAX1304–MAX1314 family was engineered specifically for industrial power electronics and motion control, delivering simultaneous sampling, fault tolerance, and metrology-grade linearity in compact LQFP packages.

FAQ

What is the maximum clock frequency supported by MAX1309ECM/V+T?

The MAX1309ECM/V+T supports external clock frequencies from 0.1MHz to 20MHz, with optimal dynamic performance (e.g., 84dBc SFDR) achieved at 16.67MHz. Internal clock operates at 15MHz. Timing parameters such as tCONV and tNEXT scale linearly with clock period, and minimum clock frequency is limited only by internal T/H droop rate - not by digital logic constraints.

Does MAX1309ECM/V+T require external reference components for basic operation?

No - the MAX1309ECM/V+T includes an internal +2.5V bandgap reference with ±30ppm/°C drift. For standard ±5V operation, only 0.1µF capacitors on REF, REFMS, REF+, REF-, and COM are required. External reference (2.0V–3.0V) is optional and used only when higher initial accuracy or custom scaling is needed.

How does the fault-tolerance specification of ±16.5V apply to MAX1309ECM/V+T inputs?

The ±16.5V fault-tolerance rating means CH0–CH3 can withstand continuous DC overvoltage up to ±16.5V relative to AGND without damage or parametric shift. This protects against transients from inductive kickback or grounding faults in motor drive environments, and is validated per Absolute Maximum Ratings - not guaranteed operational behavior beyond ±5V input range.

Can MAX1309ECM/V+T be used in unipolar input configurations?

No - the MAX1309ECM/V+T is specified exclusively for ±5V bipolar operation. Unlike the MAX1304–MAX1306 series (0 to +5V), its internal biasing, MSV connection (to AGND), and reference architecture are optimized for symmetric input ranges. Attempting unipolar use would violate datasheet operating conditions and invalidate INL/DNL guarantees.

What is the purpose of the EOLC signal in MAX1309ECM/V+T?

EOLC (End-of-Last-Conversion) goes low only after the final selected channel completes conversion - unlike EOC, which pulses for every channel. This allows host processors to trigger DMA transfers or interrupt service routines precisely once per full sequence, reducing software overhead in 4-channel acquisition cycles and preventing partial-data reads.