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 HITACHI
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9 page 
HA13151, HA13152 9 2. How to Reduce the Popping Noise by Muting Circuit At normal operating circuit, Muting circuit operates at high speed under 1 µs. In case popping noise becomes a problem, it is possible to reduce the popping noise by connecting capacitor, which determines the switching time constant, between pin 10 and GND. (Following figure 2) We recommend value of capacitor greater then 1 µF. Also transitional popping noise can be reduced sharply by muting before V CC and Standby are ON/OFF. Figure 2 How to use Muting Circuit Table 1 Muting ON/OFF Time C (µF) ON Time OFF Time nothing under 1 µs under 1 µs 0.47 2 ms 2 ms 4.7 19 ms 19 ms |
