Texas Instruments THS4141 manual Power Down Verification, Measuring the Frequency Response

Page 21

2.5 Power Down Verification

This EVM is used to evaluate devices with and without the shutdown function. Therefore, this step is only applicable if the device has a shutdown function. Please see the data sheet for power-down verification.

1)Insert the jumper JU1 to power down the device. The current consumption

(dc current meters) should drop to less than 1.5 mA. Remember to dis- count the current flow through the 10-kΩpullup resistor on the EVM when

calculating the device current consumption in the shutdown mode.

2)Turn off the power supply and disconnect the wiring.

3)Turn off the function generator and disconnect the wiring.

4)Basic operation of the operational amplifier and its EVM is complete.

2.6Measuring the Frequency Response

This EVM is designed to easily interface with network analyzers. Jumpers J3 and J4 facilitate the use and insertion of the differential probes at the input and output nodes. It is important to consider the following steps to ensure optimal performance in terms of bandwidth, phase margin, gain, and peaking

1)Connect the power supply according to the power supply set up (section 2.2)

2)Use proper load values. Loads directly effect the performance of the differential operational amplifier (the suggested value is 200 Ω differentially, 100 Ω on each output node).

Caution:

Incorrect connections cause excessive current flow and may damage the device.

3)Place the GND connection of the probe as close as possible to the output nodes. Use the GND holes on the EVM. The GND holes create a shorter route to the GND plane and output nodes.

4)Place the probe at the input nodes, set the power level of the network analyzer to the proper level (information in the data sheet typically is produced at ±20 dBm power level), and calibrate the network analyzer.

Note:

If a differential probe is used, verify that resistors R1a, R1b, R4b, and R4a are in place. The resistors are 0 Ω values providing the path to the differential probe terminals.

5)Place the probe at the output nodes (if a differential probe is used, insert the probe into the provided jumper), and measure the frequency response.

Using the THS4141 EVM

2-5

Page 20 Page 22
Image 21
Page 20 Page 22
Contents Users Guide Important Notice Preface Trademarks Contents Figures Introduction and Description Description Evaluation Module FeaturesSchematic of the Populated Circuit Default Configuration THS4141 EVM Specifications±2. Schematic THS4141 EVM SchematicAdditional Sample Schematics ±5. Vicr Level Shifter ±7. Top Layer Silkscreen THS4141 EVM Layout±9. Internal Plane Layer 2 Ground Plane ±11. Bottom Layer 4 Ground and Signal Introduction and Description Using the THS4141 EVM Required Equipment Power Supply Setup±2. Signal Connections Input and Output Setup±3. Driver 1 Output Signal Testing the EVM SetupMeasuring the Frequency Response Power Down VerificationButterworth Filter Butterworth Filter±1. THS4141 EVM Bill of Materials THS4141 EVM Bill of MaterialsP374CTR-ND General High-Speed Amplifier Design Considerations General High-Speed Amplifier Design Considerations

THS4141 specifications

The Texas Instruments THS4141 is a high-performance, broadband operational amplifier that is particularly well-suited for applications requiring high speed and precision. As a member of the THS family, this device is optimized for driving high-capacitance loads and is frequently utilized in communications, signal processing, and data acquisition systems. The THS4141 stands out due to its impressive specifications and advanced technologies.

One of the most significant features of the THS4141 is its high bandwidth. With a gain-bandwidth product of approximately 100 MHz, the amplifier can provide high fidelity signal amplification across a wide frequency range, making it ideal for high-speed applications. Additionally, it supports a slew rate of up to 2000 V/μs, which ensures fast response times to rapidly changing input signals. This characteristic is crucial for minimizing distortion in high-frequency scenarios where signal integrity is paramount.

The device operates from a wide supply voltage range of ±2.5V to ±15V, allowing flexibility in design configurations and making it suitable for both single-supply and dual-supply operation. This versatility enables designers to integrate the THS4141 seamlessly into various systems, enhancing design efficiency.

Another key characteristic of the THS4141 is its low input noise, which ensures that it can amplify weak signals without introducing significant distortion or interference. The low noise performance is critical in applications where signal clarity is essential, such as in medical imaging or precision measurement environments.

In terms of technology, the THS4141 employs advanced biCMOS processes that combine the benefits of both bipolar and CMOS technologies. This hybrid approach delivers exceptional performance through improved dynamic range and thermal stability while maintaining low power consumption.

The THS4141 is also designed to drive capacitive loads effectively, making it ideal for use in applications involving filters or transmission lines. Its output stage can handle loads of up to 1000 pF without significant instability, ensuring reliable performance in real-world conditions.

Overall, the Texas Instruments THS4141 operational amplifier is a versatile and high-performance device that excels in high-speed processing and precision applications. Its advanced features, including high bandwidth, low noise, flexible supply voltage, and stability with capacitive loads, make it a valuable component in modern electronic design, catering to the demands of innovative engineering challenges.
Top Page Image Contents