tda9884 NXP Semiconductors, tda9884 Datasheet - Page 37

• Manufacturer Part Number: tda9884
• Description: Tda9884 I2c-bus Controlled Multistandard Alignment-free If-pll For Mobile Reception
• Manufacturer: NXP Semiconductors

Philips Semiconductors
[25] Measured with an FM deviation of 25 kHz and the typical AF output voltage of 500 mV (RMS). The AF output signal can be attenuated
[26] The lower limit of the audio bandwidth depends on the value of the capacitor at pin AFD. A value of C
[27] For all S/N measurements the VIF modulator in use has to meet the following specifications:
[28] Calculation of the loop filter parameters can be done approximately using the following formulae:
[29] The PC/SC ratio is calculated as the addition of TV transmitter PC/SC
[30] Measurements taken with SAW filter G1984 (Siemens) for vision and sound IF (sound shelf: 14 dB). Picture-to-sound carrier ratio of
[31] The QSS signal output on pin SIOMAD is analyzed by a test demodulator TDA9820. The S/N ratio of this device is more than 60 dB,
[32] Measurements taken with SAW filter K3953 for vision IF (suppressed sound carrier) and K9453 for sound IF (suppressed picture
[33] Measurements taken with SAW filter K9453 (Siemens) for AM sound IF (suppressed picture carrier).
[34] The value of C
[35] 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.
[36] The SDA and SCL lines will not be pulled down if V
[37] The AC characteristics are in accordance with the I
[38] Port P1 and port P2 are open-collector outputs.
Table 26.
Table 27.
TDA9884_2
Product data sheet
BL
100
160
Description
VIF carrier
SIF carrier
Picture-to-sound carrier ratio
3dB
by 6 dB to 250 mV (RMS) via the I
reduced in order to avoid clipping (THD < 1.5 %).
f
a) Incidental phase modulation for black-to-white jump less than 0.5 degrees.
b) QSS AF performance, measured with the television demodulator AMF2 (audio output, weighted S/N ratio) better than 60 dB (at
c) Picture-to-sound carrier ratio PC/SC
K
capacitor; C
factor. For examples, see
to achieve the S/N
transmitter PC/SC = 13 dB. Input level on pins VIF1 and VIF2 of V
carrier, f
related to a deviation of 27 kHz, in accordance with “ITU-R BS.468-4” .
carrier). Input level V
Information about the I
AF( 3dB)
O
=
deviation 27 kHz) for 6 kHz sine wave black-to-white video modulation.
is the VCO steepness
(kHz)
---------------------------------- - ;
2R K
AF
Examples for
Input frequencies and carrier ratios
20 Hz and C
= 400 Hz. Measurements in accordance with “ITU-R BS.468-4” . De-emphasis is 50 s.
P
1
O
is the parallel capacitor; f
K
x
determines the accuracy of the resonance frequency of the crystal. It depends on the type of crystal used.
D
C
W
P
values as noted. A different PC/SC ratio will change these values.
i(SIF)
2
AF
BL
C-bus can be found in the brochure “The I
C
10
10
Table note 28
S
= 10 mV (RMS), 27 kHz (54 % FM deviation).
= 220 nF leads to f
Table
3dB
(nF)
rad
-------- -
V
= f
Symbol B/G standard
f
f
f
SC
SC
PC
SC1
SC2
26.
o
or
(1.55
2
1
2
C-bus. For handling a frequency deviation of more than 55 kHz, the AF output signal has to be
2
o
1
------ - ;
Hz
is the natural frequency of the PLL; BL
V
= 13 dB (transmitter).
of
38.9
33.4
33.158
13
20
2
). The formulae are only valid under the following conditions:
AF( 3dB)
Table 25
K
D
is the phase detector steepness
CC
2
C
390
150
C-bus specification for fast mode (maximum clock frequency is 400 kHz).
Rev. 02 — 12 May 2006
P
is switched off.
40 Hz.
(pF)
(FM-PLL filter)
M/N standard
45.75 or 58.75
41.25 or 54.25
-
7
-
I
2
C-bus controlled multistandard alignment-free IF-PLL
2
i(SIF)
C-bus and how to use it” (order number 9398 393 40011).
1
ratio and SAW filter PC/SC
= 10 mV (RMS) sync level, 27 kHz FM deviation for sound
R (k )
5.6
9.1
3dB
is the loop bandwidth for 3 dB;
L standard L accent standard Unit
38.9
32.4
-
10
-
-------- - ;
rad
A
R is the loop resistor; C
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
f
1
o
33.9
40.4
-
10
-
ratio. This PC/SC ratio is necessary
=
AF
----- -
2
= 470 nF leads to
1
0.5
0.5
K
--------------- - ;
1 and C
O
C
TDA9884
K
P
D
S
is the series
S
is the damping
> 5C
MHz
MHz
MHz
dB
dB
P
, where:
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