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 THS4150 EVM

2-5

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Texas Instruments THS4150 manual Power Down Verification, Measuring the Frequency Response
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THS4150 specifications

Texas Instruments (TI) is renowned for its innovative analog and mixed-signal technologies, and one of its standout products in the operational amplifier domain is the THS4150. This high-speed, precision, voltage-feedback amplifier has garnered attention in various applications, particularly in high-frequency and low-noise environments.

One of the main features of the THS4150 is its impressive bandwidth. It boasts a bandwidth of 120 MHz, making it suitable for wideband signal amplification in applications like video processing, data conversion, and instrumentation. The amplifier also has a high slew rate of 1600 V/μs, enabling it to respond quickly to rapid signal changes. This characteristic is particularly crucial for applications where maintaining signal integrity is paramount.

The THS4150 operates with a supply voltage range from ±2.5 V to ±9 V, providing flexibility for designers looking to optimize power consumption and performance in battery-operated systems or other sensitive applications. Its low input offset voltage of 0.5 mV ensures accurate signal amplification, making it ideal for precision measurement systems.

Another noteworthy aspect of the THS4150 is its output drive capability. The amplifier can source and sink up to 200 mA of output current, allowing it to drive heavy loads without significant distortion. This feature is beneficial in driving capacitive loads and connecting directly to other stages in an analog signal chain.

In terms of technology, the THS4150 employs TI’s advanced bipolar process, which combines high-speed and low-noise characteristics essential for modern electronics. The amplifier is also designed to minimize power supply rejection, ensuring stable performance even under varying power supply conditions.

The device includes built-in protection features that accommodate various real-world scenarios, such as limited input voltage conditions and short circuits at the output. Consequently, this contributes to its reliability and robustness in demanding applications.

In summary, the Texas Instruments THS4150 is a high-performance voltage-feedback amplifier that stands out due to its wide bandwidth, high slew rate, low offset voltage, and strong output drive capability. These features make it a versatile choice for various applications, including high-speed data acquisition, video signal processing, and low-noise amplification. As designers seek to create sophisticated systems requiring reliable signal integrity and performance, the THS4150 is poised to be an invaluable component in their toolbox.
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