TSH80-TSH81-TSH82

Test conditions

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3

Test conditions

3.1

Layout precautions

To use the TSH8X circuits in the best manner at high frequencies, some precautions have to

be taken for power supplies:

●

In high-speed circuit applications, the implementation of a proper ground plane on both

sides of the PCB is mandatory to ensure low inductance and low resistance common

return.

●

Power supply bypass capacitors (4.7µF and ceramic 100pF) should be placed as close

as possible to the IC pins in order to improve high frequency bypassing and reduce

harmonic distortion. The power supply capacitors must be incorporated for both the

negative and the positive pins.

●

All inputs and outputs must be properly terminated with output resistors; thus, the

amplifier load is resistive only and the stability of the amplifier will be improved.

All leads must be wide and as short as possible especially for op-amp inputs and

outputs in order to decrease parasitic capacitance and inductance.

●

In lower gain applications, use a low feedback resistance (under 1k

Ω) to reduce the

time constant with parasitic capacitance.

●

Choose component sizes as small as possible (SMD).

●

On the output, the load capacitance must be negligible to maintain good stability. You

can put a serial resistance as close as possible to the output pin to minimize the effect

of the load capacitance.

Figure 31.

CCIR330 video line