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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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BA3430S Arkusz danych(PDF) 8 Page - Rohm |
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BA3430S Arkusz danych(HTML) 8 Page - Rohm |
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8 / 14 page  30k ) R1 ) R2 G = 20 log R1 ) R2 (dB) 1 fL = 2 π C (R1 ) R2) (Hz) 5.4 C τ 1 = I (S) 1/2 VCC )2.0 τ 2 = C R In 2.0 (S) 276 Audio ICs BA3430S / BA3430F / BA3430FS (3) Sensitivity switch amplifier Equivalent circuit schematic R2 is a resistor inside the IC which is 100 Ω during play- back and 360 Ω during fast forward. The gain of the amplifier is The low cutoff frequency fL of the amplifier is (4) Comparator circuit This circuit detects the presence or not of the signal and outputs a detection signal. The circuit consists of two comparators. The first comparator detects the level of the signal and the second comparator detects the duration of the signal. When a signal above VCC /30 (VO-P) is input, the first comparator turns on and draws a constant current I from the time constant pin. This causes the voltage of the time constant pin to fall, and when it drops below VCC - 2.7(V) the next comparator turns on, changing the mute detec- tion output pin to low. If the signal level drops below VCC / 30 (VO-P), the first comparator turns off and the voltage of the time constant pin rises due to the external discharge resistor. When this voltage rises above VCC - 2.0(V), the next comparator turns off, changing the mute detection output pin to high. The time ι1 from the arrival of the signal to the changeover of the mute detection output pin to low is given as follows: This equation holds when the input signal is sufficiently large. See Fig. 20 for the small signal time τ1. The time τ2 from the ceasing of the signal to the change- over of the mute detection output pin to high is as follows: I: Output current of first comparator = approx. 1mA C: External capacitor connected to time constant pin R: External resistor connected to time constant pin (this should be 22k Ω or higher) Equivalent circuit schematic |
Podobny numer części - BA3430S |
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Podobny opis - BA3430S |
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