TDA8708 datasheet(9/24 Pages) PHILIPS

9 / 24 page

June 1994

Philips Semiconductors

Product speciﬁcation

Video analog input interface

TDA8708A

Notes

1. 0 dB is obtained at the AGC amplifier when applying Vi(p-p) = 1.33 V.

2. The output current at pin 19 should not exceed 1 mA. The load impedance RL should be referenced to VCCA and

defined as:

a) AC impedance

≥1kΩ and the DC impedance >2.7 kΩ.

b) The load impedance should be coupled directly to the output of the amplifier so that the DC voltage supplied by

the clamp is not disturbed.

3. Control mode 2 is selected.

4. Signal-to-noise ratio measured with 5 MHz bandwidth:

5. The voltage ratio is expressed as:

for VI = 1 V (p-p), gain at 100 kHz = 1 and 1 V supply variation.

6. It is recommended that the rise and fall times of the clock are

≥2 ns. In addition, a ‘good layout’ for the digital and

analog grounds is recommended.

7. These measurements are realized on analog signals after a digital-to-analog conversion (TDA8702 is used).

8. The supply voltage rejection is the relative variation of the analog signal (full-scale signal at input) for 1 V of supply

variation:

9. Full-scale sine wave (fi = 4.4 MHz; fclk = 27 MHz).

----

20 log

ANOUTC p

–

()

ANOUTY (RMS noise)

-------------------------------------------------at B = 5 MHz.

SVRR1

20 log

∆V

CCA

------------------

∆G

--------

SVRR2

∆ V

I00

()

IFF

()

–

()

I00

()

IFF

()

–

()

∆V

CCA

-----------------------------------------------------------------------------------------------------

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