參數(shù)資料
型號(hào)： TDA9886
廠商： NXP Semiconductors N.V.
英文描述： I2C-bus controlled single and multistandard alignment-free IF-PLL demodulators
中文描述： 的I2C控制的單一和多路巴士免費(fèi)中頻鎖相環(huán)解調(diào)器
文件頁數(shù)： 36/56頁
文件大小： 248K
代理商： TDA9886
2003 Oct 02
36
Philips Semiconductors
Product specification
I
2
C-bus controlled single and multistandard
alignment-free IF-PLL demodulators
TDA9885; TDA9886
22. Calculation of the loop filter parameters can be done approximately using the following formulae:
The formulae are only valid under the following conditions:
≤
1 and C
S
> 5C
P
where:
K
O
is the VCO steepness
or
;
K
D
is the phase detector steepness
;
R is the loop resistor;
C
S
is the series capacitor;
C
P
is the parallel capacitor;
f
o
is the natural frequency of PLL;
BL
3dB
is the loop bandwidth for
3 dB;
is the damping factor. For examples, see Table 19.
23. The PC/SC ratio is calculated as the addition of TV transmitter PC/SC
1
ratio and SAW filter PC/SC
1
ratio. This PC/SC
ratio is necessary to achieve the S/N
W
values as noted. A different PC/SC ratio will change these values.
24. Measurements taken with SAW filter G1984 (Siemens) for vision and sound IF (sound shelf: 14 dB).
Picture-to-sound carrier ratio of transmitter PC/SC = 13 dB. Input level on pins VIF1 and VIF2 of
V
i(SIF)
= 10 mV (RMS) sync level, 27 kHz FM deviation for sound carrier, f
AF
= 400 Hz. Measurements in accordance
with “CCIR 468” De-emphasis is 50
μ
s.
25. The QSS signal output on pin SIOMAD is analysed by a test demodulator TDA9820. The S/N ratio of this device is
more than 60 dB, related to a deviation of
±
27 kHz, in accordance with “CCIR 468”
26. Measurements taken with SAW filter K3953 for vision IF (suppressed sound carrier) and K9453 for sound IF
(suppressed picture carrier). Input level V
i(SIF)
= 10 mV (RMS), 27 kHz (54 % FM deviation).
27. Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
28. The value of C
x
determines the accuracy of the resonance frequency of the crystal. It depends on the type of crystal
used.
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
the tuning system.
30. The SDA and SCL lines will not be pulled down if V
CC
is switched off.
31. The AC characteristics are in accordance with the I
2
C-bus specification for fast mode (maximum clock frequency is
400 kHz). Information about the I
2
C-bus can be found in the brochure “The I
2
C-bus and how to use it”(order number
9398 393 40011).
32. Port P1 and port P2 are open-collector outputs.
f
o
π
2
K
K
D
C
P
---------------
=
2R K
O
K
D
C
P
---------------1
=
BL
3dB
–
f
o
1.55
(
2
–
)
=
rV
2
π
V
rad
---A
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TDA9886HN/V4-T 功能描述:調(diào)節(jié)器/解調(diào)器 DEMODULATOR VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9886HN/V5 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:I2C-bus controlled single and multistandard alignment-free IF-PLL demodulators
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