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| Optical disc ICs Headphone amplifier for CD-ROMs BH3541F / BH3543F The BH3541F and BH3543F are digital-source dual headphone amplifiers. The BH3541F has a fixed gain of 0dB and the BH3543F has a fixed gain of 6dB so that external gain setting is unnecessary. Both the BH3541F and BH3543F have internal mute functions so that prevention of the popping sound when the power is turned on and off is greatly simplified. Also, these ICs are equipped with thermal shutdown circuits to prevent damage from short circuits. FApplications Devices that use the headphone output from CD-ROMs, CDs, MDs, personal computers, notebook computers, camcorders, etc. FFeatures 1) Internal mute function to prevent popping sounds when the power is turned on and off. 2) Built-in thermal shutdown circuit (150_C) to prevent damage to the IC if a short circuit occurs. 3) Compact SOP8 pin package. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions (Ta = 25_C) 561 Optical disc ICs FBlock diagram BH3541F / BH3543F 562 Optical disc ICs FPin descriptions BH3541F / BH3543F 563 Optical disc ICs BH3541F / BH3543F FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5.0V, RL = 32, BF3541F: VIN = 0dBV, BH3543F: VIN = -6dBV, and f = 1kHz) FMeasurement circuit 564 Optical disc ICs FMeasurement conditions BH3541F / BH3543F FCircuit operation Rising edge timing 565 Optical disc ICs FApplication example BH3541F / BH3543F FExplanation of external components (1) Input coupling capacitor (C3 and C5) Determined by the low-band cut-off frequency. Since the input impedance for this IC is 180k, it can be determined by the formula below, but take into consideration the fluctuations, ambient temperature, etc. (a multi-layered ceramic capacitor is recommended). C3 (C5) = 1 / (2 180k f) (2) Bias capacitor (C6) 47F when VCC = 5V, and 33F when VCC = 3V. If the capacitance is lowered too much, the electrical characteristics will be adversely affected and popping noise may occur. Therefore, take the sufficient considerations before changing these values. (3) MUTE pin for anti-pop measures (R2, C2) Possesses an impedance of 190k with respect to GND, FOperation notes The application example is recommended by ROHM, but before use in your application, be sure to carefully confirm all electrical characteristics. so if R2 is increased too much, the MUTE mode may become unable to be released. (4) Output coupling capacitor (C1 and C7) Determined by the low-band cutoff frequency. As the output load resistance value RL (assuming that for output protection or current limiting, a resistor Rx will be inserted), it can be determined by the formula below. C1 (C7) = 1 / (2 (RL ) RX) f) (5) Input gain adjustment resistor (R3 and R4) (for BH3543F only) Input gain adjustment can be performed by external resistors R3 and R4. The desired gain can be set by the formula given below. GVC = 6 ) 20Iog (90k / (90k ) R3)) [dB] Also, for use with different circuit constants for the external circuits, be sure to leave a sufficient margin for fluctuations in characteristics in the external components and ROHM ICs in not only the static characteristics, but also the transient characteristics as well. 566 Optical disc ICs FElectrical characteristics curves BH3541F / BH3543F 567 Optical disc ICs BH3541F / BH3543F FExternal dimensions (Units: mm) 568 |
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