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參數(shù)資料
| 型號(hào)： | AN3672NFBP |
| 廠商： | PANASONIC CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Audio signal processor IC for HiFi VCR incorporating EIAJ sound multiplex system |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | QFH-64 |
| 文件頁數(shù)： | 23/29頁 |
| 文件大小： | 229K |
| 代理商： | AN3672NFBP |
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ICs for VCR
AN3672NFBP
23
I
Application Notes (continued)
3. I
2
C bus of this IC (continued)
5) Serial mode of sound multiplex
Broadcasting
signal
Serial setting Sub address (B)
D4
D3
Bilingual CTL
Line out
D2
L-ch.
R-ch.
Contents
LED-PORT (Pin 56)
Forced monaural
Bilingual
0
0
0
Main
Sub
Both
min. 2.7 V to
0
1
0
Main
Main
Main
(typ. 3.1 V)
1
*
*
*
*
0
*
*
*
*
0
Sub
Sub
Sub
1
Main
Main
Mono
Stereo
0
L
R
Stereo
min. 1.3 V to max. 1.9 V
1
*
L
+
R
L
+
R
Mono
(typ. 1.6 V)
Mono
L
+
R
L
+
R
Mono
max. 0.4 V
(typ. 0.1 V)
6) Precautions on MTS application circuit
(1) When an external input is selected with large amplitude noise into an input pin of television sound multiplex
block, an appropriate signal to noise ratio is not always guaranteed. On use of SIF input, you can counter this
problem by switching the setting from SIF to base band input through a serial control when using an external
input. In this time, however, a timing control is required to return it to SIF in advance so as not to cause any
shock noise which is likely to come out when HiFi input selector returns to television sound multiplex side.
On use of a base band input, it is recommended that you perform muting outside to prevent from noise being
inputted into television sound multiplex.
(2) On use of television sound multiplex with a base band input, if you adjust an input level for 106 mV[rms] (
=
300 mV[p-p]) with mono 100% modulation pre-emphasis off, the IC is in a state of an optimum separation.
When you can not obtain an appropriate separation due to deviation of input signal frequency characteristics,
however, you can adjust separation by fitting a volume of 100 k
between pin 47 and GND.
As the IC is already adjusted for an optimum separation with the above reference input, you can substitute
the input level adjusting volume for a separation adjustment. In this case, do not forget to set pin 47 to open.
(3) On use of sound multiplex with SIF input, an SIF input level from a tuner be set to 90 dB
μ
V
±
10 dB
μ
V
against a typical RF electric field input.
To get an appropriate separation without adjustment, you are required to use the flattest possible SIF-BPF
band width that does not cause any delay time difference between main and sub in the range of 4.5 MHz
±
42
kHz. Likewise, use the gain band width which is broad enough not to attenuate cue signal carrier where a
main component of 4.5 MHz
±
55 kHz.
(4) In the tuner characteristics, a demodulation linearity must be set to 250% or more modulation to prevent the
sub-carrier signal from being damaged by over-modulation of pre-emphasis in a higher band width.
(5) The stereo modulator must be used with good characteristics and well-calibrated equipment at measurement
of separation. When using SIF input, FM modulation factor must be tuned exactly so as to be
±
25 kHz at
mono 100% modulation and pre-emphasis off. At the same time, measurement must be done by using the
LPF which can attenuate 20 dB or more at 30 kHz between line-out and AC level-meter.
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