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 THS4151 EVM

2-5

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Texas Instruments THS4151 manual Power Down Verification, Measuring the Frequency Response
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THS4151 specifications

Texas Instruments THS4151 is a high-performance analog amplifier designed to meet the needs of various applications where precision and low power consumption are critical. This device is known for its wide bandwidth, low noise, and high slew rate, making it suitable for high-speed signal processing in telecommunications, industrial automation, and medical devices.

One of the main features of the THS4151 is its high bandwidth, with a gain bandwidth product of up to 50 MHz. This characteristic allows the amplifier to handle fast-changing signals efficiently, which is essential in modern electronic devices that require rapid response times. Furthermore, the THS4151 boasts a high slew rate of 100 V/µs, enabling it to accommodate fast signal swings without distortion, thus ensuring signal integrity across a variety of applications.

The THS4151 utilizes advanced complementary bipolar technology to achieve excellent performance while maintaining low power consumption. With a supply voltage range from 4.5 V to 12 V, the device can operate effectively in battery-operated systems, contributing to longer battery life and reduced power costs. The low quiescent current of only 5 mA further enhances its efficiency, making the THS4151 an ideal choice for portable electronics.

In addition to its impressive performance metrics, the THS4151 is designed with thermal stability in mind. Its built-in features help minimize drift and improve accuracy over a wide temperature range, which is particularly important for precision measurement applications. The device also offers a low input offset voltage and low input bias current, ensuring minimal errors in amplification.

Another key characteristic of the THS4151 is its compatibility with a wide range of input and output loads, making it versatile for different circuit configurations. The amplifier can be easily integrated into various designs, from simple feedback configurations to more complex signal conditioning applications.

Overall, the Texas Instruments THS4151 stands out as a leading choice in the high-speed amplifier market, combining advanced technology, low power consumption, and robust performance to meet the demands of today's sophisticated electronic designs. Whether used in audio processing, video signal enhancement, or sensor interfacing, the THS4151 delivers reliability and precision that engineers and designers can count on.
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