Analog Devices Inc./Maxim Integrated MAX9628ATC+T

Overview

MAX9628ATC+T from Maxim Integrated is a 4V/V gain, low-noise (3.6nV/√Hz), fully differential amplifier optimized for driving high-speed 12–16-bit pipeline ADCs up to 1.35GHz. It operates from +2.85V to +5.25V single supply, features adjustable VOCM input, shutdown mode (25µA), and delivers -91dBc/-97dBc HD2/HD3 at 10MHz with 500Ω load - used in medical imaging front-ends and ATE signal chains.

For engineers reviewing the MAX9628ATC+T datasheet, MAX9628ATC+T pinout, MAX9628ATC+T application, or MAX9628ATC+T equivalent, this page provides verified specifications, package mapping, real-world use cases, and validated alternative options for high-frequency differential signal conditioning in precision data acquisition systems.

Technical Context

The MAX9628ATC+T employs voltage-feedback architecture with on-chip gain-setting resistors (RG = 125Ω, RF = 500Ω) to fix differential gain at 4V/V while minimizing parasitic capacitance at virtual ground nodes - enabling 1.15GHz small-signal bandwidth and 1.0GHz large-signal bandwidth. Its dual feedback loops independently control differential gain and output common-mode voltage via VOCM.

Input termination resistors (RT+ and RT− = 64Ω) support 50Ω single-ended source matching without external components. The amplifier maintains balanced outputs (−77dB balance error at 10MHz) and achieves 79dB CMRR over DC–10MHz, making it suitable for transformerless interfacing to high-resolution ADCs like MAX19588.

Key Specifications

Pinout & Package

MAX9628ATC+T is housed in a 12-pin, 3mm × 3mm TQFN-EP package with exposed pad (EP) connected to VEE. The compact footprint supports high-density PCB layouts in space-constrained RF and data acquisition modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Compared with THS4561IRGET and ADA4940-1ACPZ-R7, the MAX9628ATC+T uniquely combines factory-set 4V/V gain, on-chip 64Ω termination, VOCM control, and 25µA shutdown - delivering lowest design complexity for 50Ω-source, single-supply, high-SFDR ADC driver applications.

Availability

MAX9628ATC+T is available at Aetrix Electronics and suitable for ultrasound beamforming, high-speed ATE digitizers, portable MRI monitors, and RF transceiver I/Q chains requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX9628ATC+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 high-performance analog and mixed-signal ICs for precision, power, and interface applications in industrial, medical, and communications markets.

The MAX9626/MAX9627/MAX9628 family was engineered specifically as low-noise, low-distortion, fully differential ADC drivers - targeting high-speed data acquisition systems where signal integrity, power efficiency, and layout simplicity are critical.

FAQ

What is the maximum operating frequency supported by the MAX9628ATC+T for full-power bandwidth?

The MAX9628ATC+T delivers 1.0GHz large-signal bandwidth (LSB_3dB) with 2.0V_P-P output swing, meaning it maintains full gain and linearity up to 1.0GHz for high-amplitude signals. This makes the MAX9628ATC+T suitable for driving ADCs sampling at up to ~500MSPS while preserving harmonic distortion performance below −90dBc.

Does the MAX9628ATC+T require external termination resistors when used with a 50Ω single-ended source?

No - the MAX9628ATC+T integrates 64Ω termination resistors (RT+ and RT−) designed to match 50Ω sources in single-ended configurations. When one input (e.g., IN+) is driven by 50Ω, the other (IN−) should be terminated to ground through an external 50Ω resistor to maintain symmetry and minimize gain error, as confirmed in the MAX9628ATC+T datasheet Figure 1 and Table 2.

How does the VOCM pin function in the MAX9628ATC+T, and what voltage range is valid?

The VOCM pin sets the DC common-mode voltage of both OUT+ and OUT− outputs. It accepts 1.1V to (V_CC − 1.1V), enabling flexible interfacing to ADC references such as 0.9V, 1.25V, or 2.5V. The MAX9628ATC+T maintains 0.98–1.00V/V VOCM gain and 52–64dB CMRR_VOCM, ensuring accurate, stable output bias independent of signal swing.

Can the MAX9628ATC+T operate from a single 3.3V supply while driving a 500Ω differential load?

Yes - the MAX9628ATC+T is fully specified from +2.85V to +5.25V. At V_CC = 3.3V, it delivers ±1V output swing into 500Ω (VOH = V_CC − 0.8V, VOL = V_EE + 0.65V), supports 59–80mA supply current, and maintains −91dBc HD2 at 10MHz. This confirms robust single-3.3V operation for portable and low-power instrumentation using the MAX9628ATC+T.

What is the input common-mode voltage range for the MAX9628ATC+T at 4V/V gain and VCC = 5V?

At 4V/V gain and V_CC = 5V, the MAX9628ATC+T supports −0.4V to +1.5V input common-mode voltage (VICM), as specified in the Electrical Characteristics table. This allows ground-referenced or slightly negative single-ended inputs without requiring a negative supply - a key enabler for transformerless interfacing in cost-sensitive medical and test equipment using the MAX9628ATC+T.