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| Optical disc ICs Post amplifier applicable with 1-bit D / A converter BH3561AF The BH3561AF is a post amplifier applicable with 1-bit D / A converter for compact disc players. FApplications CD players, etc. FFeatures 1) 2-channel analog filter IC for 1-bit D / A converters. 2) Internal partial CR for two channels (left and right) LPF. FBlock diagram 3) Operates on a single power supply. 121 Optical disc ICs FAbsolute maximum ratings (Ta = 25_C) BH3561AF FRecommended operating conditions (Ta = 25_C) FPin descriptions 122 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC1 = 5V, VCC2 = 5V, RL = 10k) BH3561AF 123 Optical disc ICs FMeasruement circuit BH3561AF 124 Optical disc ICs FApplication example BH3561AF FOperation notes (1) When the MUTE pin voltage reaches 1.5V or higher, the output voltage is muted and the bias level is output. (2) Frequency characteristics can be changed by adjusting the capacitor attached to pin 3 (pin 20) or pin 5 (pin 18). (3) Gain can be changed by attaching a resistor to pin 4 (pin 19). (4) Attach a transistor to pin 7 (pin 16) to mute popping sounds. Recommended transistor : 2SD1781K (5) The reset block idling power supply for pin 15 should be left on as it prevents popping sounds. (6) To prevent popping sounds due to sudden fluctuation in the power supply voltage, configure a ripple filter. (7) To prevent popping sounds due to sudden changes in the mute pin voltage, connect pin 8 to a 1F (approx.) capacitor. (8) Attach a by-pass capacitor (approx. 0.1F) at the base of the IC between the power supply. 125 Optical disc ICs FElectrical characteristic curve BH3561AF FExternal dimensions (Units: mm) 126 |
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