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參數(shù)資料
| 型號(hào)： | 935188030112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 接收器 |
| 英文描述： | FM, VIDEO DISCRIMINATOR, PDIP32 |
| 封裝： | 0.400 INCH, SHRINK, PLASTIC, SOT-232-1, DIP-32 |
| 文件頁(yè)數(shù)： | 8/26頁(yè) |
| 文件大?。?/td> | 263K |
| 代理商： | 935188030112 |
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1995 Sep 05
16
Philips Semiconductors
Preliminary specication
Multistandard VIF-PLL and
FM-PLL demodulator
TDA9806
14. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
given in Fig.6. The AFC-steepness can be changed by the resistors at pin 23.
15. Depending on the ratio
C/C0 of the LC resonant circuit of VCO (Q0 > 50; see note 3; C0 =Cint +Cext).
16. The intercarrier output signal at pin 20 can be calculated by the following formula taking into account the video output
signal at pin 21 (Vo video(p-p) = 1 V typical) as a reference:
with
= 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(rms).
Example: SAW filter G1962 (sound shelf: 20 dB)
V
o(rms) = 32 mV typical.
17. Input level for second IF from an external generator with 50
source impedance. AC-coupled with 10 nF capacitor,
fmod = 1 kHz, 27 kHz (54% FM deviation) of audio references. A VIF input signal is not permitted. Pin 28 has to be
connected to positive supply voltage for minimum IF gain. S/N and THD measurements are taken at 50
s
de-emphasis.
a) Second IF input level 10 mV RMS.
18. Measured with an FM deviation of 27 kHz the typical AF output signal is 500 mV (RMS) (Rx =0 ; see Fig.10).
By using Rx = 470 the AF output signal is attenuated by 6 dB (250 mV RMS). For handling an FM deviation of
more than 53 kHz the AF output signal has to be reduced by using Rx in order to avoid clipping (THD < 1.5%).
For an FM deviation up to 100 kHz an attenuation of 6 dB is recommended with Rx = 470 .
19. The leakage current of the decoupling capacitor (2.2
F) should not exceed 1 A.
20. For all S/N measurements the used vision IF modulator has to meet the following specifications:
a) Incidental phase modulation for black-to-white jump less than 0.5 degrees.
b) Picture-to-sound carrier ratio; PC/SC = 13 dB (transmitter).
c) Sound shelf of VIF SAW filter: minimum 20 dB.
21. Measurements taken with SAW filter K6256 (Siemens) for vision and sound IF (sound shelf: 20 dB). Input level
Vi SIF = 10 mV (RMS), 27 kHz (54% FM deviation).
22. The PC/SC ratio at pins 1 and 2 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.
Table 1
Input frequencies and carrier ratios
DESCRIPTION
SYMBOL
B/G STANDARD
UNIT
Picture carrier
fPC
38.9
MHz
Sound carrier
fSC
33.4
MHz
Picture-to-sound carrier ratio
SC
13
dB
V
o rms
()
1V p
p
–
()
1
22
-----------
×
10
V
iSC
V
iPC
------------ dB
() 6dB 3 dB
±
+
20
---------------------------------------------------------------
×
=
1
22
-----------
V
iSC
V
iPC
------------ dB
()
V
iSC
V
iPC
------------
27 dB
–
=
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