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AS2525F 数据表(PDF) 13 Page - ams AG |
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AS2525F 数据表(HTML) 13 Page - ams AG |
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13 / 28 page  Datasheet AS2525 austriamicrosystems Revision 2.1 Page 12 of 27 RO RECI +3dB +14dB Voice switching speech Gmax = -4dB … +16dB (VOL) Gmin = -33dB Offset comp Compress Peak detector Cmicoffset +23dB CBckgnd Offset comp Compress Peak detector CTXoffset Offset comp Compress Peak detector LINE Gmax = +9dB Gmin = -21dB … -40dB (VOL) +12dB RECV FT2 FT1 CBN +8dB Figure 7: Signal path of handsfree circuit Table 18: Handsfree attenuation scheme Speech Mode RX-gain TX-gain Remark RX > TX_atten X Receive 0 dB to -20 dB -50 dB to -30 dB adjustable with [V+]/[V-] keys in 8 steps TX_atten > RX No Idle -25 dB -25 dB middle position TX_atten > RX Yes Transmit -50 dB 0 dB independent of [V+]/[V-] keys -50dB -25dB 0dB TX-mode RX-mode IDLE-mode Vol min Vol default Vol max TX-gain RX-gain -10dB -20dB -40dB -30dB Figure 8: Gain transition of voice switching |
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