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| Optical disc ICs Headphone amplifier with internal LPF and EVR for CD-ROM BA3530FS The BA3530FS is an H / P amplifier with internal secondary LPF and EVR circuits. When multibit output from a D / A converter is input, the secondary LPF outputs an audio signal. The amplifier circuit allows for line output and headphone output. The output level for headphones can be changed with the EVR circuit. This IC also has independent internal mute circuits for the left and right channels. FApplications CD-ROM drives and other products (with line and headphone output pins) that process digital audio signals FFeatures 1) Internal LPF, line amplifier and EVR. 2) Internal mute function. 3) Internal thermal shutdown circuit. 4) No attached components are needed for oscillation prevention, even at a load of 8. 5) Mute function reduces the popping noises that can occur when the power is turned on and off. FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions 140 Optical disc ICs FBlock diagram BA3530FS 141 Optical disc ICs BA3530FS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5.0V, line RL1 = 50k, H / P RL2 = 32, VIN = 0.8Vrms, f = 1kHz, EVR Max.) 142 Optical disc ICs FMeasurement circuit BA3530FS 143 Optical disc ICs FApplication example BA3530FS 144 Optical disc ICs FOperation notes (1) Preventing popping noises The BA3530FS has a mute function that reduces the popping noises that can occur when the power is turned on or off. The popping noises that occur when the muting function turns on and off can be reduced by attaching a capacitor and resistor to the mute pins (pins 3 and 14). BA3530FS (2) Recommended time chart FElectrical characteristic curves FExternal dimensions (Units: mm) 145 |
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