Analog Devices Inc./Maxim Integrated MAX19505ETM+

Overview

MAX19505ETM+ from Maxim Integrated is a dual-channel, 8-bit analog-to-digital converter (ADC) delivering 65Msps sampling rate with 49.8dBFS SNR and 69dBc SFDR at 70MHz input. 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+ datasheet, MAX19505ETM+ pinout, MAX19505ETM+ application, or MAX19505ETM+ equivalent, key selection considerations include its dual parallel/multiplexed CMOS output bus, programmable clock divider (DIV1/DIV2/DIV4), SPI-controlled feature set, and 7mm × 7mm 48-pin TQFN-EP package with exposed pad for thermal management.

Technical Context

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

It supports both differential and single-ended analog inputs, differential or single-ended clock inputs, and offers programmable common-mode voltage (0.45V–1.35V in 0.15V steps) and output data formats (two's complement, gray code, offset binary). The integrated self-sensing voltage regulator allows flexible AVDD sourcing.

Key Specifications

Pinout & Package

MAX19505ETM+ is housed in a 7mm × 7mm, 48-pin thin QFN package with exposed pad (EP), optimized for thermal dissipation and high-density PCB layouts. The EP must be soldered to a large ground plane.

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 MAX19506ETM+ and MAX19515ETM+, the MAX19505ETM+ delivers optimal balance of power efficiency (43mW/channel), 65Msps throughput, and cost for mid-tier communications and instrumentation-without requiring PCB redesign.

Availability

MAX19505ETM+ is available at Aetrix Electronics and suitable for cellular infrastructure, microwave radio, ultrasound imaging, and portable test equipment requiring stable component supply and extended temperature support (-40°C to +85°C).

Supply support for MAX19505ETM+ 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+ belongs to Maxim's high-speed ADC product line, engineered specifically for RF/IF digitization in zero-IF and high-IF receiver architectures where low power, small size, and flexible interface control are essential.

FAQ

What is the absolute maximum clock frequency supported by the MAX19505ETM+?

The MAX19505ETM+ supports a maximum clock frequency of 65MHz, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Operation beyond this frequency may cause timing violations, data corruption, or permanent damage. The minimum clock frequency is 30MHz, allowing flexible clock source selection in systems with variable-rate sampling requirements. The MAX19505ETM+ maintains full AC performance specifications across this range.

Does the MAX19505ETM+ support single-ended analog inputs?

Yes, the MAX19505ETM+ supports both differential and single-ended analog inputs on channels A and B. When configured for single-ended mode, one input (e.g., INA+) is driven with the signal while the complementary input (INA-) is tied to a fixed common-mode voltage (0.4V–1.4V). The device's wide common-mode range and internal biasing options ensure accurate sampling without external level-shifting circuitry. This capability is explicitly verified in the datasheet's Analog Inputs section.

How does the internal voltage regulator in the MAX19505ETM+ operate?

The MAX19505ETM+ integrates a self-sensing voltage regulator that automatically activates when AVDD is supplied between 2.5V and 3.3V, generating a regulated 1.8V analog core supply internally. When AVDD = 1.8V, the regulator is bypassed. This dual-supply flexibility eliminates the need for an external low-noise 1.8V LDO in many designs. The regulator's behavior is transparent to the user and requires no configuration-activation is automatic based on AVDD voltage level.

Can the MAX19505ETM+ output data in offset binary format?

Yes, the MAX19505ETM+ supports offset binary output format, along with two's complement and gray code. Format selection is controlled via SPI register programming (address 01h, bit D0) or through pin-strapped mode when SPEN is high (using CS/OUTSEL and SCLK/DIV pins). Offset binary simplifies interface with legacy DSPs and FPGAs expecting unsigned integer representation, and its implementation is confirmed in the "Data Output Format" subsection of the datasheet.

What is the wake-up time from power-down mode for the MAX19505ETM+?

The MAX19505ETM+ requires 5ms to wake up from power-down mode when using the internal reference and a 0.1µF REFIO bypass capacitor (10τ time constant). This specification is measured under standard conditions (VAVDD = 1.8V, TA = +25°C) and is guaranteed by characterization. During wake-up, the internal reference stabilizes and pipeline stages reinitialize-full AC performance resumes after this interval. The MAX19505ETM+ also supports faster 15µs wake-up from standby mode.