401
Optical disc ICs BA6897S/BA6897FP
Operation notes
(1) The BA6897S and BA6897FP have an internal
thermal shutdown circuit. Output current is muted when
the chip temperature exceeds 175C (typically).
(2) If the mute pin voltage is opened or lowered below
0.5V, the output current will be muted. The mute pin
should be pulled up above 2.0V during normal use.
(3) The bias pin is muted when lowered below 1.4V
(typically). Make sure it stays above 1.6V during normal
use.
(4) Muting occurs during thermal shutdown, mute-on
operations or a drop in the bias pin voltage or supply volt-
age. In each case, only the drivers are muted. During
muting, the output pins remain at the internal bias volt-
age, roughly (V
CC–VF)/2.
(5) Be sure to connect the IC to a 0.1µF bypass capaci-
tor to the power supply, at the base of the IC.
(6) The radiating fin is connected to the packages inter-
nal GND, but should also be connected to an external
ground.
(7) The capacitor between regulator output (pin 6) and
GND also serves to prevent oscillation of the IC, so select
one with good temperature characteristics.
Electrical characteristic curves
