Analog Devices Inc./Maxim Integrated MAX1305ECM+

Overview

MAX1305ECM+ from Maxim Integrated is a 4-channel, 12-bit simultaneous-sampling analog-to-digital converter (ADC) with 0V to +5V unipolar input range and ±6V fault-tolerant inputs. It achieves 0.9μs two-channel conversion time, 456ksps per-channel throughput at 8-channel operation, and features internal 2.5V reference, 20MHz T/H bandwidth, and 48-pin LQFP package. It is designed for high-precision industrial motor control and power monitoring systems requiring synchronized multi-channel acquisition.

For engineers reviewing the MAX1305ECM+ datasheet, MAX1305ECM+ pinout, MAX1305ECM+ application, or MAX1305ECM+ equivalent, this page delivers verified electrical specifications, channel-specific timing behavior, fault-tolerant analog interface details, and real-world use cases in multiphase power and position sensing systems - all grounded in Maxim's official 19-3052 Rev 6 documentation.

Technical Context

The MAX1305ECM+ implements independent track-and-hold (T/H) circuitry per channel to enable true simultaneous sampling across all four analog inputs. Its 8ns aperture delay and 100ps channel-to-channel T/H match ensure precise phase coherence for time-critical waveform capture.

It supports both internal clock (15MHz) and external clock (up to 20MHz) operation, with configurable reference options: internal +2.5V bandgap or external +2.0V to +3.0V. The device uses separate analog (+4.75V to +5.25V) and digital (+2.7V to +5.25V) supplies, consuming 55–60mA analog current and 1.3–2.6mA digital current under full operation.

Key Specifications

Pinout & Package

MAX1305ECM+ is housed in a 48-pin 7mm × 7mm LQFP package with exposed thermal pad (RoHS-compliant, lead-free). Pin assignments are identical across the MAX1304–MAX1306 family and validated per Maxim's Pin Description table (Rev 6, p.12–13).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7357BCPZ and ADS8588HIPM, the MAX1305ECM+ offers optimal balance of 4-channel simultaneity, integrated reference, fault tolerance, and compact LQFP packaging - making it ideal for space-constrained industrial controllers where 12-bit fidelity and deterministic timing are prioritized over maximum resolution or channel count.

Availability

MAX1305ECM+ is available at Aetrix Electronics and suitable for multiphase motor control, SIN/COS position encoder interfaces, and power-grid synchronization systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MAX1305ECM+ 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 industrial, automotive, and communications applications.

The MAX1304–MAX1314 family was engineered specifically for high-fidelity, synchronized multi-channel data acquisition in harsh industrial environments - emphasizing fault tolerance, timing coherence, and integration of reference and power management functions.

FAQ

What is the maximum analog input voltage range supported by the MAX1305ECM+?

The MAX1305ECM+ supports a 0V to +5V unipolar analog input range. Its inputs are fault-tolerant to ±6V relative to AGND, meaning they withstand transient overvoltages up to +11V or –6V without damage or latch-up. This specification is explicitly defined in the Absolute Maximum Ratings and Electrical Characteristics tables of the MAX1305ECM+ datasheet (Rev 6, p.2, p.12).

Does the MAX1305ECM+ include an internal voltage reference, and what is its accuracy?

Yes, the MAX1305ECM+ integrates a +2.5V internal reference with ±30ppm/°C temperature drift and ±2.5mV initial accuracy (2.475V to 2.525V at +25°C). It also supports external reference operation from +2.0V to +3.0V via the REF and REFMS pins. These values are confirmed in the "INTERNAL REFERENCE" section of the MAX1305ECM+ datasheet (Rev 6, p.3).

How many analog input channels does the MAX1305ECM+ have, and are they truly simultaneous?

The MAX1305ECM+ has four independent analog input channels (CH0–CH3), each with dedicated track-and-hold circuitry. This architecture guarantees true simultaneous sampling - verified by 100ps channel-to-channel T/H matching and absence of inter-channel skew in timing diagrams (Figures 6–10, Rev 6, p.5–6). No multiplexing or interleaving is used.

What package type and pin count does the MAX1305ECM+ use, and is it RoHS-compliant?

The MAX1305ECM+ is supplied in a 48-pin LQFP package with 7mm × 7mm footprint and exposed thermal pad. It is lead(Pb)-free and RoHS-compliant, as indicated by the "+" suffix in the part number and confirmed in the Ordering Information table (Rev 6, p.2). Pin compatibility is shared across the MAX1304/MAX1305/MAX1306 series.

Can the MAX1305ECM+ operate with separate analog and digital supply voltages, and what are the valid ranges?

Yes, the MAX1305ECM+ requires independent analog (AVDD) and digital (DVDD) supplies. AVDD must be +4.75V to +5.25V; DVDD operates from +2.7V to +5.25V. This dual-supply architecture isolates noise-sensitive analog circuitry from digital switching transients - a requirement specified in the Absolute Maximum Ratings and Electrical Characteristics sections (Rev 6, p.2, p.4).