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參數(shù)資料
| 型號： | BD3860K |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Built-in BBE Audio sound controller |
| 中文描述： | 內(nèi)置BBE的Audio聲音控制器 |
| 文件頁數(shù)： | 22/27頁 |
| 文件大?。?/td> | 295K |
| 代理商： | BD3860K |
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BD3860K
Audio ICs
22/26
(3) Explanation of external constant
Characteristic of high frequency filter
Frequency characteristic at a maximum process control level is shown in the under-mentioned chart:
Gain
Large
C1
C2
C1 : Capacitor of VCA1-MIX1
Capacitor of VCA2-MIX2
C2 : Capacitor of MIX1-BBOUT1
Capacitor of MIX2-BBOUT2
Small
Small Large
Fig. 13
Lo
Contour
Process
Control
f
As shown in the above-mentioned chart, the cut-off frequency of treble constituent is decided by the external capacitors
C1 and C2. The frequency characteristic marked with a dotted line varies depending on this value. Balance of harmonics
changes and , therefore, it is an important parameter to decide the sound tone.
10
4
+
4
+
6
+
10
+
8
0
2
+
2
+
14
+
12
100
50
500 1k
5k 10k
100k
f(Hz)
G
VCC
=
9V
VIN
=
200mVrms
VOL
=
0dB
C1
=
0.047
μ
F
C2
=
470pF
LO CONTOUR
5dB (f
=
50Hz)
PROCESS CONTROL
12dB (f
=
10kHz)
9dB
6dB
3dB
Fig.14 BBE
ΙΙ
gain-frequency (reference)
characteristics
Controls the amplitude of treble by input signal level
The attack and release time of controls the amplitude of treble can be decided by outside constant.
The pins are DET1 (Pin 28) and DET2 (Pin 26). The method of setting is the lower figure.
The input signal level started to control the amplitude of treble is fixed on about
40dBV (Typ.) by inside circuit. Therefor, it
cannot be change from outside pin.
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