Analog Devices Inc./Maxim Integrated MAX1449EHJ

Overview

The MAX1449EHJ from Maxim Integrated is a 10-bit, 105Msps analog-to-digital converter optimized for high-dynamic-performance imaging and digital communications systems. It features a fully differential pipelined architecture, 58.5dB SNR at 20MHz input, 400MHz -3dB input bandwidth, and operates from a single 3.3V supply consuming 62mA in normal mode. It is used in ultrasound and CCD imaging front-ends where low power and wideband signal fidelity are critical.

For engineers reviewing the MAX1449EHJ datasheet, MAX1449EHJ pinout, MAX1449EHJ application, or MAX1449EHJ equivalent, key selection considerations include its 105Msps sampling rate, internal 2.048V reference, CMOS-compatible three-state parallel outputs, differential input support, and 32-pin TQFP package with extended industrial temperature range (-40°C to +85°C).

Technical Context

The MAX1449EHJ implements a 10-stage fully differential pipelined ADC architecture with digital error correction, achieving 5.5 clock-cycle latency and enabling high-speed conversion while minimizing power. Its track-and-hold circuit supports both differential and single-ended inputs with 400MHz -3dB bandwidth and 2V_P-P differential input range.

It integrates an on-chip 2.048V precision bandgap reference with 60ppm/°C temperature coefficient and supports three reference modes: internal, buffered external, and unbuffered external. Digital outputs are offset binary, CMOS-compatible, and operate from 1.7V to 3.6V OVDD, with output enable (OE) and power-down (PD) control.

Key Specifications

Pinout & Package

The MAX1449EHJ is housed in a 32-pin TQFP package (5mm × 5mm) with exposed pad, compatible with standard surface-mount reflow processes and suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1448EHJ and ADS5271IPFP, the MAX1449EHJ delivers the highest sampling rate in its pin-compatible family and includes an integrated reference-reducing BOM count and layout complexity for space-constrained imaging systems requiring >100Msps throughput.

Availability

MAX1449EHJ is available at Aetrix Electronics and suitable for ultrasound imaging systems, CCD-based machine vision platforms, and digital set-top box video digitization requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1449EHJ 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, medical, and communications markets.

The MAX1449EHJ belongs to Maxim's high-speed data acquisition product line, engineered specifically for low-power, high-SNR digitization in medical imaging and broadband communications equipment.

FAQ

What is the maximum clock frequency supported by the MAX1449EHJ?

The MAX1449EHJ supports a maximum clock frequency of 105MHz, as specified in its electrical characteristics table. This enables a sustained 105Msps sampling rate. Operation beyond this frequency is not guaranteed and may degrade SNR, SFDR, or cause timing violations. The device exhibits stable performance up to 105.26MHz under typical conditions, with clock pulse width requirements of 4.76ns ±0.47ns high and low time.

Does the MAX1449EHJ require an external reference voltage?

No, the MAX1449EHJ does not require an external reference voltage because it integrates a precision 2.048V bandgap reference with 60ppm/°C temperature coefficient. REFOUT can be directly connected to REFIN via a 10kΩ resistor for internal reference mode. External references are optional and only needed when higher accuracy, different full-scale range, or system-level reference synchronization is required.

What is the function of the COM pin on the MAX1449EHJ?

The COM pin on the MAX1449EHJ provides the common-mode voltage output for the differential analog input stage, typically at VDD/2 (1.65V with 3.3V supply). It serves as the reference midpoint for IN+ and IN−, enabling proper biasing of fully differential or single-ended input configurations. The pin must be bypassed to GND with a >0.1µF capacitor to maintain stability and noise immunity.

How does the power-down mode work on the MAX1449EHJ?

The MAX1449EHJ enters power-down mode when the PD pin is driven high, reducing analog supply current to 4–15µA and digital supply current to 1–20µA. Wake-up time from shutdown is 1.5µs, after which full performance resumes. During power-down, digital outputs enter high-impedance state if OE is also high; if OE is low, outputs retain their last valid value until wake-up completes.

Can the MAX1449EHJ accept single-ended analog inputs?

Yes, the MAX1449EHJ can accept single-ended analog inputs: connect the signal source to IN+ and tie IN− to the COM pin. While differential operation delivers optimal SFDR and CMRR, single-ended use is supported with only modest degradation-e.g., SNR drops from 58.5dB to 57.7dB at 20MHz. Input impedance remains ~20kΩ, and the full-scale range stays at ±1.0V referenced to COM.