Texas Instruments SLOU106 User Manual download pdf (Page 20)

2-4

Using the THS4140 EVM

2.4 Testing the EVM Setup

1) Turn on the dc power supply.

2) Verify that both the +5 V (current meter 1) and the –5 V (current meter 2)

currents are below 20 mA.

Caution:

Currents above 20 mA indicate a possible short or a wrong resistor value

on the PCB. Do not proceed until this situation is corrected.

3) Turn on the function generator.

4) Verify the oscilloscope is showing two 1 MHz sine waves with amplitude

of ±0.125 V. The dc offset of the signal must be below 50 mV.

Note: V

OUT+

and V

OUT–

should be 180 degrees out of phase. The internal

attenuation of the scope should be set to 6 dB for a gain of one. Otherwise,

the output will show a

gain of one-half

due to the voltage division occurring

at the 50-Ω termination resistor.

Use Figure 3 as a reference for the input and output signals.

Figure 2–3. Driver 1 Output Signal

THS4140

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Texas Instruments SLOU106 User Manual Page 20