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U4082BG-S28-T Datasheet(PDF) 10 Page - Unisonic Technologies |
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U4082BG-S28-T Datasheet(HTML) 10 Page - Unisonic Technologies |
10 / 13 page UNISONIC TECHNOLOGIES CO., LTD U4082B LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 10 of 13 www.unisonic.com.tw QW-R108-020.A FUNCTIONAL DESCRIPTION(Cont.) AGC The AGC circuit only affects the circuit under such situation: when the circuit is in the receive mode, and when VCC is less than 3.5v. As while as VCC falls below 3.5 volts, the transmit path attenuation changes so that the sum of the transmit and receive gains remains constant. ATTENUATOR CONTROL BLOCK This block has the seven: * C1: The output of the comparator operated by RLO2 and TLO2 (here means in microphone/ speaker side). * C2: The output of the comparator operated by RLO1 and TLO1 (here means Tip/ Ring side). * C3: The output of the transmit background noise monitor. * C4: The output of the receive background noise monitor. * Volume control * Dial tone detector * AGC circuit The C1~C4 effect is as follows: INPUTS OUTPUT C1 C2 C3 C4 TX TX 1 X Transmit Mode TX RX Y Y Fast Idle Mode RX TX Y Y Fast Idle Mode RX RX X 1 Receive Mode TX TX 0 X Slow Idle Mode TX RX 0 0 Slow Idle Mode RX TX 0 0 Slow Idle Mode RX RX X 0 Slow Idle Mode Switching to the full transmit or receive from any other mode is at the fast rate (~30 ms). X :Don’t care Y :C3,C4 are not both 0 |
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