CXA2546Q データシートの表示（PDF） - Sony Semiconductor

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CXA2546Q

3-band Electronic Volume

Sony Semiconductor 

CXA2546Q

(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 certain period of time from the falling edge of the CE pulse.

Time constant=(0.5/10µ) × C [s]

VCC

10µA

0.5V

CE

15

TIMER

C

CXA2546Q

(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

CXA2546Q

GND

(6) Power-off mute

When VCC goes below 5 V, the output stage bias of the fader output pins FNTO1, FNTO2, REO1, and

REO2 is turned off and the pins go to high impedance. This operation prevents popping noises caused by

the output pin potential deviating from VCC/2 when the power is turned off.

—17—

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