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BA7726 Datasheet(PDF) 10 Page - Rohm |
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BA7726 Datasheet(HTML) 10 Page - Rohm |
10 / 11 page 10 Multimedia ICs BA7726AS / BA7726AFS (8) Microphone input detection function • This function detects the signal input to MIC AMP IN (pin 26) and outputs it to pin 30. Pin 30 output No signal input to MIC AMP IN (pin 26) GND Signal input to MIC AMP IN (pin 26) VCC – 1.0V • The detection level is determined by the voltage impressed on pin 29 (V29, set with resistive division between Vcc and the ground) and is calculated with the following equation, although slight error occurs as V28 approaches ground. 0 VCC = 9.0V 510 Set within this range –70 –20 at MIC AMP IN (f = 1kHz) Pin 29 voltage: V29 (V) Fig. 7 Microphone amplifier input detection level vs. pin 29 voltage ∗ These are figures for standard samples and are not guaranteed standards. •Application example 123456789 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 10 11 12 13 14 15 16 OUTSW VOCAL SW DET ALC VR – EXPAND COMPRESS – VR VR + + 0.015 µ 0.068 µ + + + + + + 47k 18k 39k 220p 3900p 18k 1 µ + BA7726AFS ECHO LEVEL 56k 10k 10k 2.7k + 1 µ + 1000p + 0.1 µ and S H BU9252F VOCAL 8bit A / D LOOP GAIN FADER – Fig.8 VODET 0.03 × ( 0.5 V29 0.85 × (VCC – 1.0), at MIC AMP IN 1 2 × 2 × V29) [Vrms], |
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