TDA9882 Philips Semiconductors, TDA9882 Datasheet - Page 26

• Manufacturer Part Number: TDA9882
• Description: Alignment-free multistandard vision and QSS FM sound IF PLL demodulator
• Manufacturer: Philips Semiconductors

Philips Semiconductors
[21] Calculation of the loop filter can be done approximately by use of the following formulae:
[22] The PC/SC ratio is calculated as the addition of TV transmitter PC/SC
[23] The QSS signal output on pin QSSO is analyzed by a test demodulator TDA9820. The S/N ratio of this device is more than 60 dB,
[24] Measurements taken with SAW filter G3962 for vision IF (suppressed sound carrier) and K9350 for sound IF (suppressed picture
[25] Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
[26] The value of C
[27] Pin REF is able to operate as a 1-pin crystal oscillator input as well as an external reference signal input, e.g. from the tuning system.
Table 10:
Table 11:
9397 750 13507
Product data sheet
BL
100
160
Description
VIF carrier
SIF carrier
Picture-to-sound
carrier ratio
The formulae are only valid under the following conditions:
where: K
capacitor; C
For examples, see
to achieve the S/N
related to a deviation of
carrier). Input level V
3dB
BL
f
o
=
–
1 and C
=
(kHz)
3dB
---------------------------------- -
2R K
----- -
2
1
Examples to the FM PLL filter
Input frequencies and carrier ratios
O
=
is the VCO steepness
K
--------------- -
S
P
1
O
f
o
O
C
> 5C
K
is the parallel capacitor; f
x
K
P
1.55
D
determines the accuracy of the resonance frequency of the crystal. It depends on the used type of crystal.
D
C
P
W
P
Table
values as noted. A different PC/SC ratio will change these values.
–
i(SIF)
C
10
10
Symbol
f
f
f
SC
SC
PC
SC1
SC2
2
10.
S
= 10 mV (RMS), 27 kHz (54 % FM deviation).
27 kHz, in accordance with “CCIR 468” .
1
2
(nF)
rad
------ -
V
o
is the natural frequency of PLL; BL
or
B/G standard
38.9
33.4
33.158
13
20
2
Hz
------ -
V
Rev. 01 — 16 November 2004
C
390
150
; K
P
Multistandard vision and QSS FM sound IF PLL demodulator
D
(pF)
is the phase detector steepness
M/N standard L standard
45.75
41.25
-
7
-
1
ratio and SAW filter PC/SC
3dB
is the loop bandwidth for 3 dB;
R (k )
5.6
9.1
38.9
32.4
-
10
-
------ -
rad
A
; R is the loop resistor; C
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
1
L-accent
standard
33.9
40.4
-
10
-
ratio. This PC/SC ratio is necessary
0.5
0.5
TDA9882
is the damping factor.
w w w . D a t a S h e
Unit
MHz
MHz
MHz
dB
dB
S
is the series
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