401

Optical disc ICs

BA6897S/BA6897FP

FOperation notes

(1)

The BA6897S and BA6897FP have an internal

thermal shutdown circuit. Output current is muted when

the chip temperature exceeds 175

_C (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-

(5)

Be sure to connect the IC to a 0.1

µF 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.

FElectrical characteristic curves