поискавой системы для электроныых деталей |
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BA3826 датащи(PDF) 4 Page - Rohm |
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BA3826 датащи(HTML) 4 Page - Rohm |
4 / 7 page 579 Audio ICs BA3826S (2) Band-pass filter circuit This circuit extracts the required frequency range from the input signal and amplifies it. The center frequency is determined by the value of the current flowing through the resistor connected to pin 14. Q is set to 3.5 (Typ.). Due to the characteristics of the band-pass filter circuit, the circuit has a transition rise and fall characteristic. Due to the transition rise characteristic, five input cycles are required until peak output is reached. When RESET is input, a built-in circuit cancels the fall transition characteristic (input the reset signal for 0.5ms). (3) DET circuit The DET circuit detects the signal selected by the band pass filter and performs peak hold. The RESET Driver discharges the charge stored in the capacitor. After the RESET input is released, the RESET Driver discharges continuously for 14ms. (4) Timing 1) RESET timing The RESET input is used as the RESET signal for the band-pass filter circuit and the DET circuit. The setting time is 0.5ms min. When performing a RESET input, disable both the Lin and Rin inputs. The synchronous shift in this case must be "0.1ms max. 2) Output select timing The audio input signal is not accepted when the RESET input and L (R) inputs are low. There are no particular re- strictions on the select input for the various frequencies, but there are delay times until the peak voltage is settles (see (a) and (b) below). Accordingly, set the read timing for the DET signal after the longer of the delay times in (a) and (b). (a) For the band-pass filter, a sampling time of at least 5 cycles is required due to the transition rise characteris- tic. |
Аналогичный номер детали - BA3826 |
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Аналогичное описание - BA3826 |
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