tda9885ts NXP Semiconductors, tda9885ts Datasheet - Page 36

• Manufacturer Part Number: tda9885ts
• Description: I2c-bus Controlled Single And Multistandard Alignment-free If-pll Demodulators
• Manufacturer: NXP Semiconductors

Philips Semiconductors
22. Calculation of the loop filter parameters can be done approximately using the following formulae:
23. The PC/SC ratio is calculated as the addition of TV transmitter PC/SC
24. Measurements taken with SAW filter G1984 (Siemens) for vision and sound IF (sound shelf: 14 dB).
25. The QSS signal output on pin SIOMAD is analysed by a test demodulator TDA9820. The S/N ratio of this device is
26. Measurements taken with SAW filter K3953 for vision IF (suppressed sound carrier) and K9453 for sound IF
27. Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
28. The value of C
29. Pin REF is able to operate as a 1-pin crystal oscillator input as well as an external reference signal input, e.g. from
30. The SDA and SCL lines will not be pulled down if V
31. The AC characteristics are in accordance with the I
32. Port P1 and port P2 are open-collector outputs.
2003 Oct 02
I
alignment-free IF-PLL demodulators
2
The formulae are only valid under the following conditions:
where:
K
K
R is the loop resistor;
C
C
f
BL
ratio is necessary to achieve the S/N
Picture-to-sound carrier ratio of transmitter PC/SC = 13 dB. Input level on pins VIF1 and VIF2 of
V
with “CCIR 468” . De-emphasis is 50 s.
more than 60 dB, related to a deviation of 27 kHz, in accordance with “CCIR 468” .
(suppressed picture carrier). Input level V
used.
the tuning system.
400 kHz). Information about the I
9398 393 40011).
f
BL
o
C-bus controlled single and multistandard
o
O
D
i(SIF)
S
P
is the damping factor. For examples, see Table 19.
is the natural frequency of PLL;
=
=
–
is the VCO steepness
is the phase detector steepness
is the series capacitor;
is the parallel capacitor;
3dB
1 and C
3dB
----------------------------------- -
2R K
------ -
2
1
= 10 mV (RMS) sync level, 27 kHz FM deviation for sound carrier, f
is the loop bandwidth for 3 dB;
=
K
-------------- -
f
o
C
1
O
O
S
K
K
P
1.55
> 5C
x
D
D
determines the accuracy of the resonance frequency of the crystal. It depends on the type of crystal
C
P
–
P
2
rad
------- -
V
2
or
C-bus can be found in the brochure “The I
W
2
------- -
rad
A
values as noted. A different PC/SC ratio will change these values.
Hz
------ -
V
i(SIF)
;
;
= 10 mV (RMS), 27 kHz (54 % FM deviation).
2
CC
C-bus specification for fast mode (maximum clock frequency is
36
is switched off.
1
ratio and SAW filter PC/SC
AF
2
= 400 Hz. Measurements in accordance
C-bus and how to use it” (order number
TDA9885; TDA9886
Product specification
1
ratio. This PC/SC