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| 型號： | TDA9880T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Alignment-free multistandard vision and FM sound IF-PLL demodulator |
| 中文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO20 |
| 封裝： | 7.50 MM, PLASTIC, MS-013AC, SOT-163-1, SOP-20 |
| 文件頁數(shù)： | 19/40頁 |
| 文件大?。?/td> | 195K |
| 代理商： | TDA9880T |
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1999 Jul 21
19
Philips Semiconductors
Product specification
Alignment-free multistandard vision and
FM sound IF-PLL demodulator
TDA9880
14. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
given in Fig.8. The AFC steepness can be changed by resistors R1 and R2.
15. The tolerance of the reference frequency determines the accuracy of the VIF AFC, FM demodulator centre frequency
and maximum FM deviation.
16. The intercarrier output signal at pin 11 can be calculated by the following formula taking into account the internal
video signal with 1.1 V (p-p) as a reference:
V
×
=
where:
= correction term for RMS value,
= sound-to-picture carrier ratio at VIF input (pins 1 and 2) in dB,
6 dB = correction term of internal circuitry and
±
3 dB = tolerance of video output and intercarrier output amplitude
V
o(intc)(rms)
.
17. For normal operation no DC load at pin 11 is allowed, so the automatic audio mute function is not active.
By connecting a 2.2 k
resistor between pin 11 and ground the automatic audio mute function will be activated.
With this application also the series capacitor C
S
of the loop filter at pin 4 should be changed from 33 nF to 4.7 nF.
18. Calculation of the FM-PLL filter can be done approximately by use of the following formulae:
The formulae are only valid under the following conditions:
≤
1 and C
S
> 5C
P
where:
V
K
O
= VCO steepness
or
; K
D
= phase detector steepness
;
R
S
= loop resistor; C
S
= series capacitor; C
P
= parallel capacitor; f
o
= natural frequency of PLL;
BL
3 dB
= loop bandwidth for
3 dB;
= damping factor. For examples see Table 1.
19. For all S/N measurements the used vision IF modulator requires an incidental phase modulation for black-to-white
jump of less than 0.5 degrees.
20. Measurements taken with SAW filter M1963M (Siemens) for vision and sound IF (sound shelf: 20 dB).
Picture-to-sound carrier ratio of transmitter: PC/SC = 10 dB. Input level (at pins 1 and 2) V
i(VIF)(rms)
= 10 mV (sync
level), 25 kHz FM deviation for sound carrier, f
AF
= 400 Hz. Measurement in accordance with “CCIR 468-4”
De-emphasis = 75
μ
s.
21. The PC/SC ratio is calculated as the addition of TV transmitter PC/SC ratio and SAW filter PC/SC 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.
22. Measured with an FM deviation of 25 kHz, the typical AF output signal is 500 mV (RMS). By using R
x
= 20 k
the
AF output signal is attenuated by 6 dB, so 250 mV (RMS). For handling an FM deviation of more than 55 kHz the
AF output signal has to be reduced by using R
x
in order to avoid clipping (THD < 1.5%). For an FM deviation up to
100 kHz an attenuation of 6 dB is recommended.
23. C
DEEM
= 10 nF results in
τ
= 50
μ
s and C
DEEM
= 15 nF results in
τ
= 75
μ
s.
V
o(intc)(rms)
1.1 V (p-p)
2 2
----1
×
10
V
---------------------------20
(
)
6 dB
3 dB
±
+
2 2
----1
V
V
i PC
)
--------------- dB
)
f
o
π
2
K
K
D
C
P
---------------
=
2R K
O
K
D
C
P
---------------1
=
BL
3 dB
–
f
o
1.55
(
2
–
)
=
rad
2
π
V
Hz
μ
A
rad
--------
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