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參數(shù)資料
| 型號(hào)： | BA7797 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | VCR standard audio signal processor |
| 中文描述： | 錄像機(jī)標(biāo)準(zhǔn)音頻信號(hào)處理器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 108K |
| 代理商： | BA7797 |
7
Video ICs
BA7797F
Operation notes
(1) ALC level
Set the ALC level in the range – 8dBV to 0dBV by con-
necting a resistor between pin 9 and GND.
The formula for approximating the value of this resistor
is as follows:
When pin 9 is open, V
OA
is preset to – 8dBV (for V
CC
=
10V).
Note that the supply voltage V
CC
has an effect.
(2) Mute signal
Apply the mute signal shown below at power on and off.
If the muting time is short, a “pop” sound will be audi-
ble, particularly when the power is switched on.
9
ALC LEVEL
R
4k
32k
V
BIAS
ALC DET
ADJ
Fig.4
(H)
(H)
V
CC
MUTE CTRL
LINE OUT
Fig.5
2 sec. Min.
Also, be certain to apply the mute signal when switch-
ing between PB / LINE / TU. In the case of LINE / TU
switching, it is possible to suppress switching noise by
applying a time constant to the signal, in which case it
is not necessary to apply the mute signal.
(3) Recording control
Do not switch the PB and REC modes on together.
This will cause faulty operation.
(4) Line output
The line output can drive a load resistance of up to 2k
.
Depending on the type of load, it can cause local oscil-
lation (eg. large capacitive loads that draw large cur-
rent), so caution is required. In particular, when there is
a possibility that the line output will be connected to a
shielded cable, or line cable, connect a resistor of about
1k
in series with the output so that the capacitive load
is not directly coupled to the IC output terminal.
2
V
CC
– 0.7
V
BIAS
V
OA
=
2
1
1
4k
4k + 32k
×
R / (32k + R)
4k
4k + 32k
×
R / (32k + R)
2
=
2
V
CC
– 0.7
V
BIAS
V
BIAS
=
32k
×
R / (32k + R)
4k + 32k
×
R / (32k + R)
9pin Voltage =
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相關(guān)代理商/技術(shù)參數(shù) |
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| BA7797F | 制造商:ROHM 制造商全稱:Rohm 功能描述:VCR standard audio signal processor |
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