Analog Devices Inc./Maxim Integrated MAX11047ECB+

Overview

The MAX11047ECB+ from Maxim Integrated is a 4-channel, 16-bit simultaneous-sampling analog-to-digital converter (ADC) with independent track-and-hold per channel, 250ksps throughput per channel, 0–5V input range, and internal 4.096V reference. It operates from 4.75V–5.25V analog and 2.7V–5.25V digital supplies, and is used in multiphase motor control and power-grid protection systems requiring precise synchronized acquisition.

For engineers reviewing the MAX11047ECB+ datasheet, MAX11047ECB+ pinout, MAX11047ECB+ application, or MAX11047ECB+ equivalent, this page delivers verified specifications, package mapping, functional pin definitions, real-world use cases, and validated alternative parts - all grounded in the official MAX11047–MAX11059 datasheet (Rev 2, Jan 2011).

Technical Context

This ADC employs independent SAR architecture with dedicated T/H circuitry per channel, enabling true simultaneous sampling across all four inputs without inter-channel skew. Its 100ps channel-to-channel T/H matching and 10ns aperture delay ensure high-fidelity phase coherence for multi-sensor measurement systems.

The device supports both internal and external reference modes: the internal 4.096V reference provides ±4ppm/°C drift over –40°C to +85°C, while external reference operation accepts 3.0V–4.25V inputs for full-scale ranges up to +5.2V. A 20MHz bidirectional parallel interface enables low-latency data transfer without protocol overhead.

Key Specifications

Pinout & Package

MAX11047ECB+ is housed in a 64-pin TQFP-EP (10mm × 10mm) package with exposed pad connected internally to AGND. Pin assignments are identical across MAX11047/MAX11048/MAX11049 TQFP variants per datasheet Figure 1 and Pin Description Table (p.11–12).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7606C-4 and ADS8684, the MAX11047ECB+ uniquely delivers true 4-channel simultaneous sampling at 250ksps with parallel interface simplicity, internal reference stability, and proven performance in high-EMI grid and motor-control environments - making it optimal for deterministic, low-jitter, multi-sensor acquisition where timing integrity is non-negotiable.

Availability

MAX11047ECB+ is available at Aetrix Electronics and suitable for power-grid protection relays, multiphase motor drives, and automatic test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX11047ECB+ 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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.

The MAX11047ECB+ belongs to Maxim's precision simultaneous-sampling ADC family, designed specifically for demanding energy infrastructure and motion control systems where channel-to-channel timing coherence and DC accuracy are mission-critical.

FAQ

What is the maximum sampling rate per channel for the MAX11047ECB+?

The MAX11047ECB+ achieves 250ksps per channel with true simultaneous sampling across all four inputs. This rate is maintained under full-load conditions with internal reference, 5V analog supply, and 3.3V digital supply - confirmed in the Electrical Characteristics table (p.3) and Typical Operating Characteristics (p.6, toc06).

Does the MAX11047ECB+ support external reference operation?

Yes, the MAX11047ECB+ supports external reference input via the REFIO pin, accepting voltages from 3.0V to 4.25V to set full-scale input ranges from +3.7V to +5.2V. When using external reference, the internal reference is disabled, and REFIO must be bypassed with a 0.1µF capacitor to AGND per datasheet Section "Pin Description" (p.11).

What is the purpose of the RDC and RDC_SENSE pins on the MAX11047ECB+?

The RDC pin provides decoupling for the internal reference buffer and must be connected to a ≥80µF bulk capacitor network tied to AGND. RDC_SENSE (present only on TQFP packages like MAX11047ECB+) is a feedback sense point for the reference buffer - it must be connected directly to the RDC plane to maintain reference stability and minimize noise-induced errors.

How does the MAX11047ECB+ handle overvoltage conditions on its analog inputs?

The MAX11047ECB+ features internal ±20mA input clamps on each CH0–CH3 pin, providing overrange protection up to –2.5V to +7.5V relative to AGND. When combined with an external series resistor (e.g., 1kΩ), this clamp limits input current and prevents damage during transient overvoltage events without requiring external diodes or TVS devices.

Is the MAX11047ECB+ pin-compatible with other members of the MAX11047–MAX11049 family?

Yes - the MAX11047ECB+ (4-channel, 16-bit, TQFP) shares identical pinout and package dimensions with MAX11048ECB+ (6-channel) and MAX11049ECB+ (8-channel). This allows hardware reuse across channel-count variants; only firmware configuration and input routing differ, simplifying design scalability for multi-tier product families.