bh3543f ROHM Co. Ltd., bh3543f Datasheet - Page 6

• Manufacturer Part Number: bh3543f
• Description: Headphone Amplifier Cd-roms
• Manufacturer: ROHM Co. Ltd.

FApplication example
FExplanation of external components
(1)
Determined by the low-band cut-off frequency. Since the
input impedance for this IC is 180k , it can be deter-
mined by the formula below, but take into consideration
the fluctuations, ambient temperature, etc. (a multi-lay-
ered ceramic capacitor is recommended).
C3 (C5) = 1 / (2
(2)
47 F when V
pacitance is lowered too much, the electrical characteris-
tics will be adversely affected and popping noise may oc-
cur. Therefore, take the sufficient considerations before
changing these values.
(3)
Possesses an impedance of 190k with respect to GND,
FOperation notes
The application example is recommended by ROHM, but
before use in your application, be sure to carefully con-
firm all electrical characteristics.
566
Optical disc ICs
Input coupling capacitor (C3 and C5)
Bias capacitor (C6)
MUTE pin for anti-pop measures (R2, C2)
CC
= 5V, and 33 F when V
180k
f)
CC
= 3V. If the ca-
so if R2 is increased too much, the MUTE mode may be-
come unable to be released.
(4)
Determined by the low-band cutoff frequency. As the out-
put load resistance value R
protection or current limiting, a resistor Rx will be in-
serted), it can be determined by the formula below.
C1 (C7) = 1 / (2
(5)
BH3543F only)
Input gain adjustment can be performed by external re-
sistors R3 and R4. The desired gain can be set by the for-
mula given below.
G
Also, for use with different circuit constants for the exter-
nal circuits, be sure to leave a sufficient margin for fluc-
tuations in characteristics in the external components
and ROHM ICs in not only the static characteristics, but
also the transient characteristics as well.
VC
= 6 ) 20Iog (90k / (90k ) R3)) [dB]
Output coupling capacitor (C1 and C7)
Input gain adjustment resistor (R3 and R4) (for
(R
L
) R
BH3541F / BH3543F
L
X
(assuming that for output
)
f)