TDA9801 datasheet(13/32 Pages) PHILIPS

13 / 32 page

1999 Aug 26

Philips Semiconductors

Product speciﬁcation

Single standard VIF-PLL demodulator

and FM-PLL detector

TDA9801

Notes

1. Values of video and sound parameters can be decreased at VP = 4.5 V.

2. This parameter is not tested during production and is only given as application information for designing the television

receiver.

3. Conditions for video demodulator:

a) Loop bandwidth: BL = 60 kHz, natural frequency fn = 15 kHz, damping factor d = 2, calculated with grey level and

FPLL input level

b) Resonance circuit of VCO: Qo > 50, see Table 2 for the value of the external capacitor C; CVCO = 8.5 pF, loop

voltage is approximately 2.6 V at VP = 5 V and approximately 2.7 V at VP =9V.

4. Temperature coefficient of the external LC circuit is equal to zero.

5. Vi(VIF)(rms) = 10 mV; ∆f = 1 MHz (VCO frequency offset related to fPC); white picture video modulation.

6. Vi(VIF) signal for nominal video signal.

7. Broadband transformer at the VIF input (see Fig.12). The C/N ratio at the VIF input for ‘lock-in’ is defined as the VIF

input signal (RMS value of sync pulse level) related to a superimposed 5 MHz band-limited white noise signal

(RMS value). The video modulation is for white picture.

8. The offset current is measured between pin TPLL and half of the supply voltage (VP = 2.5 V) under the conditions:

a) no input signal at VIF inputs

b) IF amplifier gain at minimum (VAGC =VP) and pin ADJ is left open-circuit.

9. The intercarrier output signal is superimposed to the video signal at pin VSO and can be calculated by the following

formula:

where

a) 1.0 V (p-p) = video output signal as reference

= correction term for RMS value

= sound-to-picture carrier ratio at VIF inputs in dB

d) 6 dB = correction term of internal circuitry

±2 dB = tolerance of video output and intercarrier output amplitude Vo(intc)(rms).

f) Example for SAW filter G1962:

sound shelf value = 20 dB,

Measurements from VIF input to AF output; notes 20 and 21; see Fig.13

S/NW

weighted signal-to-noise

ratio

“CCIR 468-4”

black picture (sync only)

−

white picture

−

colour bar

−

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

o(intc)(rms)

1.0 V (p-p)

-----------

i(SC)

i(PC)

--------------- (dB)

6 dB

2 dB

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

-----------

i(SC)

i(PC)

--------------- (dB)

i(SC)

i(PC)

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

27 dB

–

o(intc)(rms)

32 mV (typical value)

⇒

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