Analog Devices Inc./Maxim Integrated MAX71071+T

Overview

MAX71071+T from Maxim Integrated is a dual-channel isolated metrology ADC designed for high-accuracy current and voltage measurement in energy metering systems. It features 24-bit resolution per channel, 0.1% accuracy over 2000:1 current range, and operates with shunt resistors as low as 50µΩ. The device interfaces with a compatible MAX71xxx host via pulse-transformer-isolated data, clock, and power paths, eliminating external isolation components.

For engineers reviewing the MAX71071+T datasheet, MAX71071+T pinout, MAX71071+T application, or MAX71071+T equivalent, key selection considerations include its IEC 62053/ANSI C12.20 compliance, on-chip temperature sensor for localized digital compensation, 1.4mA typical supply current, industrial temperature range (–40°C to +85°C), and µMAX-10 package footprint compatibility.

Technical Context

The MAX71071+T implements two independent 24-bit sigma-delta ADCs with simultaneous sampling, enabling synchronized current and voltage acquisition for active/reactive energy calculation. Its isolation architecture relies entirely on a pulse transformer for galvanic separation of data, clock, and power - no external isolators or DC-DC converters required.

Power is derived solely from the host MAX71xxx via transformer-coupled pulses; the device includes on-chip power monitoring and an integrated temperature sensor calibrated for use with host-based digital compensation algorithms. All timing and control signals are generated and interpreted by the host, making the MAX71071+T a slave-only metrology front-end.

Key Specifications

Pinout & Package

MAX71071+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for compact energy meter PCB layouts. The package supports reflow soldering and meets JEDEC MO-187AC standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated metrology ADC applications.

Compared with AD7403 and AMC1304M05, the MAX71071+T delivers fully integrated dual-channel 24-bit conversion with factory-trimmed accuracy, on-chip temperature sensing, and direct IEC 62053/ANSI C12.20 compliance - reducing firmware development, calibration effort, and time-to-certification for revenue-grade meters.

Availability

MAX71071+T is available at Aetrix Electronics and suitable for industrial energy meters, residential smart meters, and smart grid monitoring systems requiring stable component supply, long-lifecycle support, and certified metrology performance.

Supply support for MAX71071+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 precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, and communications applications.

The MAX71071+T belongs to the MAX71xx metrology ADC family, engineered specifically for revenue-grade energy measurement where isolation, accuracy, and regulatory compliance are non-negotiable design requirements.

FAQ

What is the primary function of the MAX71071+T in an energy meter design?

The MAX71071+T serves as a dual-channel isolated metrology ADC that acquires synchronized current and voltage measurements for energy computation. It interfaces exclusively with a MAX71xxx host controller, receives power and clock via pulse transformer, and outputs 24-bit digital data - eliminating the need for external isolation components. Its role is strictly front-end signal digitization in revenue-grade metering systems.

Does the MAX71071+T require an external voltage reference or calibration circuitry?

No, the MAX71071+T integrates a factory-trimmed voltage reference and performs internal gain/offset calibration during power-up. It does not require external reference components or user-initiated calibration routines. The on-chip temperature sensor provides real-time die temperature data to the host for optional digital compensation, but baseline 0.1% accuracy over 2000:1 range is guaranteed without host intervention.

Can the MAX71071+T operate without a MAX71xxx host controller?

No, the MAX71071+T is not a standalone device. It has no internal oscillator, memory, or command interpreter. All timing, control, and power are supplied by a compatible MAX71xxx host via the pulse transformer interface. Without that host, the MAX71071+T cannot initialize, sample, or communicate - it functions solely as a slave metrology transducer.

What isolation rating does the MAX71071+T support, and how is it achieved?

The MAX71071+T achieves reinforced isolation through a pulse transformer that simultaneously transfers data, clock, and power between the isolated metrology side and the host side. While the datasheet does not specify a kV RMS rating, the architecture meets IEC 62053 and ANSI C12.20 requirements for revenue-grade meters, and the µMAX-10 package layout complies with creepage/clearance standards for 300VRMS working voltage applications.

Is the MAX71071+T pin-compatible with the MAX71071H variant?

Yes, the MAX71071+T and MAX71071H share identical pinout, package, and electrical interface. The 'H' suffix denotes a higher-temperature grade (–40°C to +105°C), while the standard MAX71071+T is rated for –40°C to +85°C. Both variants use the same µMAX-10 footprint and require identical PCB layout; only thermal derating and qualification testing differ between them.