ROHM BA3530FS

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.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions
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4) No attached components are needed for oscillation
prevention, even at a load of 8Ω.
5) Mute function reduces the popping noises that can
occur when the power is turned on and off.
Optical disc ICs
BA3530FS
Block diagram
141
Optical disc ICs
BA3530FS
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5.0V, line RL1 = 50kΩ, H / P RL2 = 32Ω,
VIN = 0.8Vrms, f = 1kHz, EVR Max.)
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Optical disc ICs
BA3530FS
Measurement circuit
143
Optical disc ICs
Application example
144
BA3530FS
Optical disc ICs
Operation 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
Electrical characteristic curves
External dimensions (Units: mm)
145