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CXA2506Q

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Sony Semiconductor 

CXA2506Q

(4) Zero-cross detector and Timer

A built-in zero-cross detection circuit is used to detect the zero-cross points of the input signal. When data

arrived at the IC, they are executed at the next zero-cross point or when there is no input signal. This is to

minimize 'click' noise during the transition of levels.

The timer circuit is added to ensure that the data is executed even when a zero-cross point is not detected

after a pre-determined period of time from the falling edge of the CE pulse.

Time constant=(0.5/10µ) × C [sec]

VCC

10µA

0.5V

CE

CXA2506Q

15

TIMER

C

(5) VCT pin

The internal circuit of VCT pin has the following structure.

Insert a buffer when using it as a reference voltage for an external circuit.

VCC

VCT 17

100k

100k

CXA2506Q

GND

(6) Power-off Mute

This function mutes the output pins FNTO1, FNTO2, REO1 and REO2, when the VCC goes below 5V, by

turning off the bias of the output stage of the fader circuit. By so doing, the 'pop' noise caused by the drop

in these pins potential from VCC/2 during power-off can be avoided.

—18—

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