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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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MSM7731-01 Fiches technique(PDF) 5 Page - OKI electronic componets |
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MSM7731-01 Fiches technique(HTML) 5 Page - OKI electronic componets |
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5 / 43 page  5/43 ¡ Semiconductor MSM7731-01 PIN FUNCTIONAL DESCRIPTION AIN, AGSX These are the acoustic analog input and level adjusting pins. The AIN pin is connected to the inverting input of the internal amp and the AGSX pin is connected to the amp output. For level adjustment, refer to the diagram below (Figure 1). At power-down reset, the AGSX pin goes to a high impedance state. AVFRO, AOUT, APWI These are the acoustic analog output and level adjusting pins. The AVFRO pin is an audio output and can directly drive 20 kW. The AOUT pin is an analog output and can directly drive a load of 1.2 kW. For level adjustment, refer to the diagram below (Figure 1). At power-down reset, these output pins go to a high impedance state. LIN, LGSX These are the line analog input and level adjusting pins. The LIN pin is connected to the inverting input of the internal amp and the LGSX pin is connected to the amp output. For level adjustment, refer to the diagram below (Figure 1). At power-down reset, the LGSX pin goes to a high impedance state. If LIN is not used, short the LIN and LGSX pins together. LVFRO, LOUT, LPWI These are the line analog output and level adjusting pins. The LVFRO pin is an audio output and can directly drive 20 kW. The LOUT pin is an analog output and can directly drive a load of 1.2 kW. For level adjustment, refer to the diagram below (Figure 1). At power-down reset, these output pins go to a high impedance state. If LOUT is not used, short the LPWI and LOUT pins together. LINEEN This is the power-down control pin for the line CODEC. A logic "0" continues normal operation and a logic "1" powers down only the line CODEC. If the line CODEC is not used, power down the line CODEC and short the LIN pin to the LGSX pin and the LPWI pin to the LOUT pin. This procedure results in the low consumption of electrical power. At power-down, the output pins go to a high impedance state. Since this pin is ORed with CR0-B5 of the control register, set the pin to a logic "0" when controlling power-down by the control register. If the pin setting is changed, reset must be activated by either the PDN/RST pin or the PDN/RST bit (CR0-B7). Figure 1 Analog Interface Acoustic CODEC + – SG AIN AGSX R2 R1 C1 VI R2≥20kW VAGSX/VI=R2/R1 £ 30 + – 10mF 0.1mF R3 R4 + – APWI AOUT C2 VO Speaker Speaker amp VO/VAVFRO=R3/R4 R3≥20kW Line CODEC LGSX LIN LVFRO LPWI LOUT LINEEN Same as the acoustic analog interface Line side (portable phone) Reception signal Transmission signal Acoustic side (microphone, speaker) Microphone VREF to ENCODER from DECODER AVFRO |
Numéro de pièce similaire - MSM7731-01 |
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Description similaire - MSM7731-01 |
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