BH3866AS datasheet(21/25 Pages) ROHM

21 / 25 page

Video ICs

BH3866AS

(4) Bass filter for tone control

GND

VCC

2 V

30k

2 V

25k

RB, LB, and CB pins

GND

VCC

2 V

30k

LPF

RT, LT, and CT pins

HPF configuration

–

0.001

0.1

0.01

0.001

0.01

0.1

Gain 0dB voltage

VCC = 9V

AGCADJ voltage = 4.1V

LR common-mode input

AGC off

AGC on

INPUT VOLTAGE (Vrms)

Fig. 6 (Reference data)

AGC characteristic

600

500

400

300

200

100

2.5

3.5

4.5

[3pin]

VCC = 9V

LR same-phase input

AGCADJ VOLTAGE (V)

Fig. 7 (Reference data) Relation

between AGCADJ voltage

and gain 0dB voltage

· Determining cutoff frequencies

At a frequency of fC1, the LPF will be –3dB.

fC1 =

πC1R1

πC1 × 30k

(5) Treble filter for tone control

Fig.5

Fig.4

(6) Setting the AGC level

The AGC level is set by the voltage divider between

voltage VCC and GND. A gain of 0dB voltage should be

used in the range of 100mVrms to 400mVrms.

fC2 =

πC2R2

πC2 × 30k

BH3866AS Datasheet(PDF) 21 Page - Rohm

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