BA3870 Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BA3870

BBS (bass boost system) for radio cassette players

ROHM Semiconductor 

Audio ICs

BA3870

FOperation notes

(1) External value at CONTτ pin

The BBS on / off “pop” sound can be reduced by increas-

ing the value of the capacitor connected to the CONTτ

pin, however, on / off switching time will increase. Select

a value appropriate for the application.

(2) External value at DET NF pin

The gain GE can be decreased by connecting a series RC

circuit to the DET NF pin, however, feedback will in-

crease causing greater susceptibility to oscillation. We

recommend a gain GE of 10dB or more.

(3) External value at BBS LEVEL pin

The comparator level can be increased by reducing the

ratio of the resistors connected to the BBS LEVEL pin,

however, taking into consideration the power supply volt-

age characteristics and transient characteristics, we rec-

ommend the following:

VBuVBBS LEVELyVB*500mV

VB

: DC voltage at BIAS OUT pin

( = 1 / 2 VCC)

VBBS LEVEL : DC voltage at BBS LEVEL pin

432

(4) External value at LP NF pin

The low frequency gain GB can be decreased by increas-

ing the value of the resistor in the series RC circuit con-

nected to the LP NF pin, however, feedback will increase

causing greater susceptibility to oscillation. We recom-

mend a gain GB of 12dB or more.

(5) Coupling capacitors

Decide the polarity of the input and output coupling ca-

pacitors based on the electrical potentials of the devices

to which they are being connected.

Share Link: