315

Optical disc ICs

BA6198S / BA6198FP

FOperation notes

(1)

Relationship between mute and reset output

Drop in regulator voltage

When the regulator volt-

age drops below 4.0V (typically), the reset output

changes to the low level and the IC is simultaneously

muted. When the regulator voltages rises above 4.2V

(typically), reset output changes to the high level and

muting is released.

Drop in bias voltage

When the bias pin voltage

drops below 1.4V (typically), the IC is muted and the re-

set output simultaneously changes to the low level. Dur-

ing ordinary use, the bias voltage should be kept above

1.6V.

Thermal shutdown

When the chip temperature

rises above 175

_C (typically), the IC is muted and the re-

set output simultaneously changes to the low level.

Muting

When the mute pin voltage is opened or

lowered below 0.5V, the IC is muted, but the reset output

remains the same.

(2)

Muting occurs during thermal shutdown, mute-on

operations or a drop in the bias pin voltage or regulator

voltage. In each case, only the drivers are muted. During

muting, the output pins remain at the internal bias volt-

(3)

Be sure to connect the IC to a 0.1

µF bypass capaci-

tor between the power supplies, at the base of the IC.

(4)

The radiating fin is connected to the package’s in-

ternal GND, but should also be connected to an external

ground.

(5)

The capacitor between regulator output (pin 8) and

GND also serves to prevent oscillation of the IC, so select

one with good temperature characteristics.

FElectrical characteristic curves