TDA9881 Philips Semiconductors, TDA9881 Datasheet - Page 31

• Manufacturer Part Number: TDA9881
• Description: Alignment-free vision and FM sound IF PLL demodulator
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 13417
Product data sheet
Fig 18. Audio signal-to-noise ratio as a function of picture-to-sound carrier ratio in intercarrier mode.
(1) Signal.
(2) Noise at H-picture (CCIR weighted quasi peak).
(3) Noise at black picture (CCIR weighted quasi peak).
S/N
(dB)
Conditions: PC/SC ratio is measured at pins VIF1 and VIF2; via transformer; 27 kHz FM deviation; 50 s de-emphasis.
W
10
10
20
30
40
50
60
70
0
52
49
46
43
40
37
Rev. 01 — 16 November 2004
34
gain controlled operation of FM PLL
Alignment-free vision and FM sound IF PLL demodulator
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28
25
22
19
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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13
PC/SC ratio
TDA9881
10
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(1)
(2)
(3)
7
mhc118
4
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