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BA6297AFP Datasheet(PDF) 5 Page - Rohm |
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BA6297AFP Datasheet(HTML) 5 Page - Rohm |
5 / 6 page ![]() VCC *VF 2 322 Optical disc ICs BA6297AFP FCircuit operation The BA6297AFP comprises a 4-channel driver, internal bias amplifier, mute pin and thermal shutdown. (1) Driver The driver uses a buffer to output one of the outputs from its preamplifier with no modification, and uses an inver- sion amplifier to invert the other output before sending it to the driver buffer. The inversion amplifier’s reference is the bias voltage generated internally (pin 7 voltage), and so the preamplifier output must make the zero level equal to the internal bias voltage. See Figs. 7 and 8 for exam- ples. (2) Internal bias amplifier Configured as shown in Fig. 9. The internal bias voltage (Vref) is calculated thus : Vref= (3) Mute pin (pin 15) The output current is muted when this pin receives the low level or a high impedance. Set the pin voltage at high during normal operation. (4) Thermal shutdown The BA6297AFP has an internal thermal shutdown cir- cuit. Output current is muted when the chip temperature exceeds 175 _C (typically). |
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