TSH70CDT datasheet(19/25 Pages) STMICROELECTRONICS

19 / 25 page

TSH70, 71, 72, 73, 74, 75

19/25

TESTING CONDITIONS:

Layout precautions:

To use the TSH7X circuits in the best manner at

high frequencies, some precautions have to be

taken for power supplies:

- First of all, the implementation of a proper ground

plane in both sides of the PCB is mandatory for

high speed circuit applications to provide low in-

ductance and low resistance common return.

- Power supply bypass capacitors (4.7uF and ce-

ramic 100pF) should be placed as close as possi-

ble to the IC pins in order to improve high frequen-

cy bypassing and reduce harmonic distortion. The

power supply capacitors must be incorporated for

both the negative and the positive pins.

- Proper termination of all inputs and outputs must

be in accordance with output termination resistors;

then the amplifier load will be only resistive 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.

- For lower gain application, attention should be

paid not to use large feedback resistance (>1k

Ω)

to reduce time constant with parasitic capacitanc-

es.

- Choose component sizes as small as possible

(SMD).

- Finally, on output, the load capacitance must be

negligible to maintain good stability. You can put a

serial resistance the closest to the output pin to

minimize its influence.

CCIR330 video line

Maximum input level:

The input level must not exceed the following val-

ues:

u negative peak: must be greater than

-Vcc+400mV.

u positive peak value: must be lower than

+Vcc-400mV.

The electrical characteristics show the influence of

the load on this parameter.

Video capabilities:

To characterize the differential phase and differ-

ential gain a CCIR330 video line is used.

The video line contains 5 (flat) levels of luma on

which is superimposed chroma signal. (the first

level contains no luma). The luma gives various

amplitudes which define the saturation of the sig-

nal. The chrominance gives various phases which

define the colour of the signal.

Differential phase (respectively differential gain)

distortion is present if a signal chrominance phase

(gain) is affected by luminance level. They repre-

sent the ability to uniformly process the high fre-

quency information at all luminance levels.

When differential gain is present, colour saturation

is not correctly reproduced.

The input generator is the Rohde & Schwarz

CCVS. The output measurement is done by the

Rohde and Schwarz VSA.

Measurement on Rohde and Schwarz VSA.

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