TDA9881 Philips Semiconductors, TDA9881 Datasheet - Page 27

• 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 9. Typical analog AFC characteristic.
Fig 10. Typical signal-to-noise ratio as a function of VIF
(dB)
S/N
80
60
40
20
0
Pin numbers for TDA9881HN in parenthesis.
input voltage.
30
TDA9881
V
P
50
(23)
21
I
AFC
70
V
R1
22 k
R2
22 k
AFC
90
V
(V)
V
AFC
i(VIF)
5
4
3
2
1
0
36
mhc112
(dB V)
Rev. 01 — 16 November 2004
110
Alignment-free vision and FM sound IF PLL demodulator
37
Fig 11. Input signal conditions.
lock range without SAW filter
38
21 dB
SC CC
SC is sound carrier, with respect to sync level.
CC is chrominance carrier, with respect to sync
level.
PC is picture carrier, with respect to sync level.
The sound carrier levels are taking into account a
sound shelf attenuation of 14 dB (SAW filter
G1984M).
13.2 dB
AFC window
38.71 39.09
BLUE
38.9
3.2 dB
PC
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
40
f (MHz)
21 dB
SC CC
13.2 dB
TDA9881
YELLOW
41
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001aab345
10 dB
mha739
0
PC
I
( A)
AFC
100
100
200
200
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