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BA7725S Datasheet(PDF) 7 Page - Rohm |
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BA7725S Datasheet(HTML) 7 Page - Rohm |
7 / 8 page 7 Multimedia ICs BA7725S / BA7725FS 10 5 – 100 –50 0 Secondary echo Sound source Primary echo 0 ATT (dB) V4 = 9.0V LOOP GAIN CTRL pin voltage : (V) Line output attenuation vs. loop gain control pin voltage Fig.7 0 – 50 – 100 05 10 Primary echo Sound source ATT (dB) ECHO LEVEL CTRL pin voltage : (V) Line output attenuation vs. echo level control pin voltage Fig.6 (2) LINE IN / LINE OUT gain Line amplifier gain is fixed at +18dB. + + +12dB Fig.5 2 1 21 22 MIC AMP IN R9 R10 SW LINE OUT LINE IN After being amplified by the internal microphone amplifier, the audio signal is log- arithmically compressed by 1 / 2 then input to the tertiary low pass filter, which comprises an internal BF and attached capacitor and resistor. (3) Echo level control The DC voltage supplied to pin 4 (BA7725S) or pin 3 (BA7725FS) determines when the microphone switch is turned on and off and controls the echo level. Line input and level-controlled microphone input are mixed and output. Mode Threshold voltage Operation L (1.0V Max.) Only line audio is output. MIC OFF H (2.0V Min.) MIC ON Microphone switch control Echo level control Attenuation of the primary echo signals from sound source can be controlled by changing the DC voltage impressed on pin 4 (BA7725S) or pin 3 (BA7725FS) between 2V and 9V. Attenuation of primary echo signals can be controlled by changing the DC voltage impressed on pin 6 (BA7725S) or pin 5 (BA7725FS) . |
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