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U4082BG-S28-T Datasheet(PDF) 10 Page - Unisonic Technologies

Part # U4082BG-S28-T
Description  VOICE SWITCHED SPEAKER-PHONE CIRCUIT
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

U4082BG-S28-T Datasheet(HTML) 10 Page - Unisonic Technologies

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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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