Analog Devices Inc./Maxim Integrated MAX19505ETM+T

Overview

The MAX19505ETM+T from Maxim Integrated is a dual-channel, 8-bit analog-to-digital converter (ADC) with 65Msps sampling rate, 49.8dBFS SNR at 70MHz, and 69dBc SFDR at 70MHz. It operates from a 1.8V analog supply (or 2.5–3.3V via integrated regulator), supports DC-coupled RF/IF inputs across 0.4V–1.4V common-mode range, and targets zero-IF and high-IF sampling in cellular base stations and microwave receivers.

For engineers reviewing the MAX19505ETM+T datasheet, MAX19505ETM+T pinout, MAX19505ETM+T application, or MAX19505ETM+T equivalent, key selection considerations include its dual parallel CMOS output bus, programmable clock divider (DIV1/DIV2/DIV4), 7mm × 7mm 48-pin TQFN package with exposed pad, and support for single-ended or differential analog/clock inputs.

Technical Context

The MAX19505ETM+T employs a 10-stage fully differential pipelined architecture with 9-cycle latency, enabling high-speed conversion while maintaining low power. Its digital error correction ensures no missing codes and compensates for comparator offsets across all stages.

It features dual independent track-and-hold circuits per channel, programmable common-mode reference (0.45V–1.35V in 0.15V steps), and configurable data output timing via DCLKA/DCLKB. The device supports both SPI-controlled register programming and pin-strapped parallel mode for output format, clock division, and bus configuration.

Key Specifications

Pinout & Package

The MAX19505ETM+T is housed in a 7mm × 7mm, 48-pin thin QFN package with exposed thermal pad (EP), rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 8-bit, high-speed ADC applications.

Compared with MAX19505ETM+T, MAX19506ETM+ delivers higher sample rate at increased power, while ADS5271IPFP offers comparable speed but demands more external support circuitry and lacks on-chip clock/data timing aids.

Availability

MAX19505ETM+T is available at Aetrix Electronics and suitable for cellular infrastructure, microwave communications, medical ultrasound, and portable instrumentation requiring stable component supply, RoHS-compliant packaging, and extended temperature operation.

Supply support for MAX19505ETM+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and medical applications.

The MAX19505ETM+T belongs to Maxim's high-speed data converter family, engineered specifically for RF/IF digitization in wireless infrastructure and test equipment where low power, small footprint, and flexible interface are critical.

FAQ

What is the maximum input frequency supported by the MAX19505ETM+T?

The MAX19505ETM+T specifies a full-power bandwidth (FPBW) of >850MHz, meaning it maintains specified dynamic performance (e.g., SNR, SFDR) for analog inputs up to at least 850MHz. This enables undersampling of RF signals far beyond its 65Msps Nyquist limit, supporting direct IF sampling in cellular and microwave applications without external anti-alias filtering.

Does the MAX19505ETM+T support both differential and single-ended analog inputs?

Yes, the MAX19505ETM+T supports both configurations. Each channel (INA+/INA-, INB+/INB-) can accept differential inputs by default. For single-ended use, tie one input (e.g., INA-) to the corresponding common-mode reference (CMA) and drive the other (INA+) with the signal referenced to that common-mode voltage. Input resistance and capacitance values remain valid in either mode.

How does the internal voltage regulator in the MAX19505ETM+T work?

The MAX19505ETM+T integrates a self-sensing analog supply regulator that automatically activates when AVDD is set to 2.5V–3.3V, allowing operation from a higher-voltage rail while maintaining internal 1.8V core logic. When AVDD = 1.8V, the regulator is bypassed. This dual-supply flexibility simplifies power system design and improves noise isolation between digital and analog domains in mixed-signal systems.

Can the MAX19505ETM+T operate with an external reference voltage?

Yes, the MAX19505ETM+T supports external reference via the REFIO pin. An externally applied voltage between 1.125V and 1.3125V (±5% of 1.25V) adjusts the full-scale range according to V_FS = 1.5 × [V_REFIO/1.25] V. Internal reference is enabled by bypassing REFIO to ground with ≥0.1µF; external reference requires disabling the internal generator via register control.

What are the power states and wake-up times for the MAX19505ETM+T?

The MAX19505ETM+T offers three power states: active (43mW/channel), standby (15mW), and power-down (0.65mW). Wake-up from power-down takes 5ms (with internal reference and 0.1µF C_REFIO), while wake-up from standby is 15µs. These fast transitions support burst-mode acquisition in portable and energy-sensitive applications without sacrificing signal integrity on resume.