company blog about TI RUN-FDA-4567-EVM Fully Differential Amplifier Evaluation Module With Input Common Mode Control

TI RUN-FDA-4567-EVM Fully Differential Amplifier Evaluation Module With Input Common Mode Control

Shenzhen Mingjiada Electronics Co., Ltd. is a globally renowned distributor of electronic components, offering immediate availability of TI's RUN-FDA-4567-EVM fully differential amplifier evaluation module with input common-mode control.

The RUN-FDA-4567-EVM evaluation module, specifically engineered for the THS4567 high-performance fully differential amplifier, serves as an invaluable tool for engineers exploring complex differential signal processing circuits.

【Core Overview of the RUN-FDA-4567-EVM Evaluation Module】

The RUN-FDA-4567-EVM is an evaluation module (EVM) suitable for fully differential amplifiers with input common-mode control, such as the THS4567 in a RUN (VQFN-16) package. This EVM is designed to demonstrate the amplifier's functionality and versatility quickly and conveniently. Via on-board connectors, the RUN-FDA-4567-EVM evaluation module connects directly to power supplies, signal sources, and test equipment. Its inputs and outputs can be configured for straightforward connection to common 50Ω laboratory equipment or optionally connected via differential diodes as inputs. The module offers multiple connection options for input common-mode, output common-mode, and enable control signals. The output stage may be optionally connected via a transformer to convert differential outputs to single-ended signals for compatibility with test equipment.

Unlike standard fully differential amplifiers which only provide output common-mode control, the THS4567's core innovation lies in its independent input common-mode (VICM) and output common-mode (VOCM) control loops. This feature grants designers unprecedented flexibility to optimise bias conditions and maximise signal swing when operating as a photodiode transimpedance amplifier (TIA) or analogue-to-digital converter (ADC) driver. The RUN-FDA-4567-EVM was specifically developed to demonstrate and validate this powerful capability. Its design philosophy enables engineers to evaluate device performance rapidly, straight out of the box, thereby accelerating product development cycles.

The core strength of the RUN-FDA-4567-EVM evaluation module lies in its comprehensive connectivity options, offering multiple connection methods for input common-mode, output common-mode, and enable control signals. The output features an optional transformer interface, enabling conversion of differential outputs to single-ended signals for convenient use with standard test equipment.

【RUN-FDA-4567-EVM Key Features and Design Advantages】

The RUN-FDA-4567-EVM evaluation module is meticulously engineered with multiple features facilitating laboratory evaluation and prototyping:

Flexible Power Supply and Interface Configuration: The module is pre-configured for dual-supply operation (±1.65V to ±2.75V) while also supporting modification to single-supply operation (3.3V to 5.5V), accommodating diverse system power environments. Standard SMA connectors are employed for both inputs and outputs, with reserved connection points for terminating resistors to match 50Ω impedance test equipment (such as signal generators and spectrum analysers), ensuring signal integrity at high frequencies.

Configurable input common-mode control: The module incorporates optional diode input clamping pins, allowing flexible configuration of input common-mode control. This is critical for applications requiring precise input bias voltage settings, such as photodetector interfaces.

Comprehensive output conversion options: The evaluation board provides optional transformer connection points, enabling straightforward conversion of the amplifier's differential outputs to single-ended signals. This facilitates connection to most test and measurement equipment that only supports single-ended inputs.

Performance-optimised layout: The entire PCB layout is optimised for high-bandwidth devices like the THS4567, designed to minimise parasitic effects and ensure evaluation accurately reflects the chip's ultimate performance.

Technical Highlights of the Companion Chip THS4567

To fully appreciate the value of the RUN-FDA-4567-EVM, one must understand its counterpart, the THS4567 fully differential amplifier. This device represents a new generation of fully differential amplifiers (FDAs), employing an undercompensated design with a minimum stable gain of 10 V/V.

The THS4567 boasts impressive key specifications: a gain-bandwidth product (GBWP) of 220 MHz and a slew rate of 500 V/µs. At a gain of 10 V/V, it achieves a bandwidth of 42 MHz while maintaining low voltage noise of 4.2 nV/√Hz.

The chip supports a wide supply voltage range: single-supply operation from 3.3 V to 5.5 V, and dual-supply operation from ±1.65 V to ±2.75 V. This broad operating voltage range enables adaptation to diverse application environments.

The THS4567 offers an option to disable the input common-mode loop, allowing it to function as a standard fully differential amplifier. This flexibility allows engineers to compare the performance differences between input common-mode controlled and traditional fully differential amplifiers in specific applications.

【RUN-FDA-4567-EVM Target Application Scenarios】

The RUN-FDA-4567-EVM and its core evaluated THS4567 amplifier are ideal for the following high-performance applications:

High-speed data acquisition system front-end: As an ADC driver, its 220MHz gain-bandwidth product and 500 V/µs slew rate handle high-speed signals. Independent common-mode control ensures perfect matching with the ADC reference voltage, enhancing system signal-to-noise ratio.

Precision sensor interface: Particularly suited for connecting photodiodes, differential-output pressure sensors, etc. Independent VICM control allows optimal bias voltage provision for sensors without compromising amplifier operating range (e.g., maximising photodiode reverse bias to reduce junction capacitance), thereby enhancing response speed and sensitivity.

Professional video and RF signal processing: Its fully differential architecture and robust common-mode rejection capability significantly improve signal quality in scenarios requiring long cable runs or harsh electromagnetic environments.

Mingjiada Electronics maintains long-term supply of other TI evaluation board components, including but not limited to the following models:

DLP5530Q1EVM

DLP470NEEVM

DLP470TEEVM

DLP480REEVM

DLP550HEEVM

DLP650LEEVM

DLP650NEEVM

DLP660TEEVM

DLP670REEVM

DLP780NEEVM

DLP780TEEVM

DLP800REEVM

DLP550JEEVM

DLP650TEEVM

DLP3021LEQ1EVM