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| Optical disc ICs Post amplifier applicable with 1-bit D / A converter BH3562F The BH3562F is a post amplifier applicable with 1-bit D / A converter for compact disc players. FApplications Portable CD players, etc. FFeatures 1) 2-chancel analog filter IC for 1-bit D / A converts. 2) Internal partial CR for two channels (left and right) LPF. FAbsolute maximum ratings (Ta = 25_C) 3) Operates on a single power supply. 4) Operates on a power supply voltage as low as 3.1V. FRecommended operating conditions (Ta = 25_C) 127 Optical disc ICs FBlock diagram BH3562F FPin descriptions 128 Optical disc ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC1 = 25_C, VCC2 = 3.5V, RL = 10k) BH3562F 129 Optical disc ICs FMeasurement circuit BH3562F 130 Optical disc ICs FApplication example BH3562F 131 Optical disc ICs 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 (20 pin) or pin 5 (18 pin). (3) Gain can be changed by attaching a resistor to pin 4 (19 pin). (4) Attach a transistor to pin 7 (16 pin) to mute popping sounds. Recommended transistor: 2SD1781K FElectrical characteristic curve BH3562F (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, attach a ripple filter. (7) To prevent popping sounds due to sudden changes in the mute pin voltage, connect pin 8 to 1F (approx.) capacitor. (8) Attach a by-pass capacitor (approx. 0.1F) at the base of the IC between the power supply. FExternal dimensions (Units: mm) 132 |
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