ROHM BH3562F

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.
3) Operates on a single power supply.
4) Operates on a power supply voltage as low as 3.1V.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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Optical disc ICs
Block diagram
Pin descriptions
128
BH3562F
Optical disc ICs
BH3562F
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC1 = 25_C, VCC2 = 3.5V, RL = 10kΩ)
129
Optical disc ICs
Measurement circuit
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BH3562F
Optical disc ICs
BH3562F
Application example
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Optical disc ICs
Operation 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
Electrical characteristic curve
External dimensions (Units: mm)
132
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 1µF (approx.) capacitor.
(8) Attach a by-pass capacitor (approx. 0.1µF) at the
base of the IC between the power supply.