Analog Devices Inc./Maxim Integrated MAX1422ECM+D

Overview

The MAX1422ECM+D from Maxim Integrated is a 12-bit, 20Msps, 3.3V analog-to-digital converter with fully differential pipelined architecture, internal 2.048V precision bandgap reference, 67dB SNR at 5MHz input, and 400MHz small-signal input bandwidth-designed for medical ultrasound imaging and IF digitization where low power (137mW) and high dynamic performance are critical.

For engineers reviewing the MAX1422ECM+D datasheet, MAX1422ECM+D pinout, MAX1422ECM+D application, or MAX1422ECM+D equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two validated alternative ADCs with documented functional and thermal-range differences.

Technical Context

The MAX1422ECM+D implements a 12-stage, fully differential pipelined ADC architecture with digital error correction to eliminate missing codes and compensate comparator offsets across all stages. It uses a wideband track-and-hold amplifier with 400MHz small-signal -3dB bandwidth and supports both differential and single-ended analog inputs referenced to AVDD/2.

Its clock interface accepts CMOS-compatible single-ended or differential signals (CLK/CLK), sampling on the rising edge of CLK with 2ps aperture jitter; latency is fixed at seven clock cycles. Reference operation supports three modes: internal (2.048V), buffered external (via REFIN), or unbuffered external (REFIN = AGND, REFP/REFN/CML driven externally).

Key Specifications

Pinout & Package

MAX1422ECM+D is housed in a 48-pin TQFP package (7mm × 7mm × 1.4mm) with exposed paddle for thermal enhancement. Pin assignments follow standard Maxim layout: dual ground domains (AGND/DGND), separate analog/digital supplies (AVDD/DVDD), fully differential analog inputs (INP/INN), complementary clock inputs (CLK/CLK), 12-bit parallel CMOS outputs (D0–D11), and configurable reference I/O (REFP/REFN/CML/REFIN).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-power ADC applications.

Compared with MAX1422ECM+D, MAX1421ECM+ trades SNR and power for speed within identical packaging, while ADS5271IPFP sacrifices ease of interface and reference integration for LVDS noise immunity and channel density-making MAX1422ECM+D optimal for balanced performance in standalone, thermally sensitive, or cost-driven designs.

Availability

MAX1422ECM+D is available at Aetrix Electronics and suitable for medical ultrasound imaging, radar IF digitization, CCD pixel processing, and industrial data acquisition requiring stable component supply across extended temperature ranges.

Supply support for MAX1422ECM+D 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 demanding industrial, medical, and communications applications.

The MAX1422 product line targets low-power, high-dynamic-range digitization in imaging and communications systems-designed to replace discrete ADC + reference + driver solutions with a single, thermally optimized, production-ready IC.

FAQ

What is the maximum clock frequency supported by the MAX1422ECM+D?

The MAX1422ECM+D supports a maximum clock frequency of 20MHz, as guaranteed across its full operating temperature range (-40°C to +85°C). At this rate, it achieves 20Msps sampling with 67dB SNR at 5MHz input frequency. Exceeding 20MHz violates absolute timing specifications and may cause metastability or missing codes in the MAX1422ECM+D output stream.

Does the MAX1422ECM+D require external decoupling capacitors, and if so, what values?

Yes, the MAX1422ECM+D requires specific decoupling: AVDD and DVDD each need a parallel network of 0.1µF + 1nF ceramic capacitors to their respective grounds (AGND/DGND), plus a bulk 10µF capacitor; REFP, REFN, REFIN, and CML must each be bypassed to AGND with 0.22µF || 1nF. These values are mandatory to maintain 67dB SNR and prevent digital switching noise from coupling into the analog path of the MAX1422ECM+D.

Can the MAX1422ECM+D operate with a single-ended analog input?

Yes, the MAX1422ECM+D supports single-ended analog inputs via INP with INN tied to CML (AVDD/2), provided input impedance is matched and common-mode voltage is stabilized. However, differential drive yields superior SFDR (up to 74dBc) and THD performance-especially above 10MHz-so single-ended use is recommended only for lower-frequency, cost-sensitive implementations of the MAX1422ECM+D.

What is the function of the CML pin on the MAX1422ECM+D?

The CML (Common-Mode Level) pin on the MAX1422ECM+D sets the input common-mode voltage for INP/INN-typically biased at AVDD/2 (1.65V). When using the internal reference, CML is internally generated and must be bypassed to AGND. In unbuffered external reference mode (REFIN = AGND), CML becomes a high-impedance input accepting 1.65V ±10%, enabling custom common-mode level adjustment in the MAX1422ECM+D signal chain.

How does the power-down mode affect the MAX1422ECM+D's output behavior?

When PD is asserted high, the MAX1422ECM+D enters full shutdown mode: analog and digital supplies draw only 20µA, the internal reference is disabled, and all outputs go inactive. If OE remains low during PD assertion, the last valid output word is latched-but no new conversions occur until PD returns low. This behavior allows deterministic state retention in low-power sleep cycles of the MAX1422ECM+D.