BA335

Audio ICs Audio level sensor BA335 The BA335 is a sensor amplifier which consists of three blocks : a small signal audio amplifier, a hysteresis comparator, and a driver. Housed in a 9-pin SIP package, it is optimal for tape recorder end detection and tape mute detection. FApplications Tape end detection Tape mute detection FFeatures 1) Built-in comparator with stable hysteresis under power supply voltage and temperature fluctuations. 2) Built-in transistor and diode capable of driving an inductive load at 600mA. FAbsolute maximum ratings (Ta = 25_C) 3) Time delays can be created as needed with an external CR circuit. FInternal circuit schematic 829 Audio ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 9.0V) BA335 FMeasurement circuit 830 Audio ICs BA335 FAttached components C1 : Input coupling capacitor. 1 to 2.2µF recommended. C2 : AC bypass capacitor. 0.1 to 0.47µF recommended. R1, C3 : Resistor and capacitor for setting time delay. R2, C4 : Resistor and capacitor for ripple filter. FInput characteristics As shown in Fig. 4, VP6 and VP8 invert when the input reaches approximately *45dBm. VP8 is designed to be able to directly drive the NPN small signal transistor at this time. When on, VP6 is capable of accepting a maximum of 600mA of current (this will vary as shown in the duty cycle table). A continuous ON should last for no more than 3 seconds. Time delay using the hysteresis comparator is as follows. When an input signal of *4...