bh3866as ROHM Co. Ltd., bh3866as Datasheet - Page 21

• Manufacturer Part Number: bh3866as
• Description: Dual-line Serial Control Sound Processor Ic
• Manufacturer: ROHM Co. Ltd.

(4) Bass filter for tone control
(5) Treble filter for tone control
(6) Setting the AGC level
The AGC level is set by the voltage divider between
voltage V
used in the range of 100mVrms to 400mVrms.
GND
Video ICs
0.001
V
0.01
CC
0.1
10
1
0.001
Gain 0dB voltage
Fig. 6 (Reference data)
AGC off
CC
INPUT VOLTAGE (Vrms)
0.01
and GND. A gain of 0dB voltage should be
AGC characteristic
GND
V
V
AGCADJ voltage = 4.1V
LR common-mode input
0.1
CC
CC
R
1
= 9V
1
2 V
RB, LB, and CB pins
Fig.4
30k
CC
AGC on
1
C
1
1
2 V
10
CC
5k
R
+
–
2
25k
1
2 V
30k
CC
RT, LT, and CT pins
C
2
+
–
Fig.5
· Determining cutoff frequencies
At a frequency of f
600
500
400
300
200
100
f
C1
0
Fig. 7 (Reference data) Relation
2
=
HPF configuration
2 C
AGCADJ VOLTAGE (V)
2.5
between AGCADJ voltage
and gain 0dB voltage
1
1
R
3
1
LPF
=
3.5
C1
f
C2
2 C
, the LPF will be –3dB.
+
=
4
1
+
1
2 C
V
LR same-phase input
CC
–
= 9V
[3pin]
30k
1
4.5
2
R
2
=
5
BH3866AS
2 C
2
1
30k
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