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| Audio ICs Mute detector IC BA3707 The BA3707 is a mute detector, with an on-chip output transistor that can directly drive a solenoid. It features low operating voltage, and a wide power supply voltage range. FApplications Mute, and end-of-tape detector for tape players FFeatures 1) Open-collector output transistor with 300mA drive capacity. 2) Sense time, TC, can be set to the desired length using an external RC circuit. 3) By grounding the MUTE input (pin 6), song selection can be forcibly halted. 4) When muted, the input impedance at the input (pin 3) is several hundred ohms, which prevents crosstalk between left and right channels in stereo equipment. 5) The circuit has been designed to prevent incorrect operation due to tape noise between songs. 6) A wide operating power supply voltage range (3V to 14V). FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions 733 Audio ICs FBlock diagram BA3707 FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 6V) FMeasurement circuit 734 Audio ICs FApplication example BA3707 FElectrical characteristics curves 735 Audio ICs BA3707 FDifferences between BA3707 and BA3706 The basic operation and pin layout for the two chips are the same, but the BA3707 is designed for low-voltage operation, and uses a modified version of the BA3706 circuit. The differences are as follows : (1) The pulldown discharge resistor for MUTE (pin 6) is built into the BA3706. The BA3707 does not have this resistor. Be aware of this when using a switch to switch muting on and off (pin 6) with the BA3707. (2) As the BA3707 is designed for low voltage operation, the threshold level is different to that of the BA3706. For this reason, the circuit time constants differ as given in the table below. 736 Audio ICs FTiming chart BA3707 FExternal dimensions (Units: mm) 737 |
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