AN618 Panasonic Semiconductor, AN618 Datasheet - Page 7

• Manufacturer Part Number: AN618
• Description: Recording and playing amplifier IC for answering telephones
• Manufacturer: Panasonic Semiconductor

ICs for Telephone
C1 : Output comparison between TLOG1 and RLOG1.
C2 : Output comparison between TLOG2 and RLOG2.
Block Diagram
Operation in the Hand-free Mode
Trans./Rec. Switching Characteristics
Attenuator Control
RX
RX
RX
TX
TX
TX
TX
C1
—
MIC
SP
TLOG1
RLOG1
Receiver Gain
RX
RX
RX
TX
TX
TX
TX
C2
—
Input signal
MIC Level
Monitor
SP Level
Monitor
Trans. noise
noise
noise
noise
TX
TX
TX
—
—
Idle Mode
Noise Level
Monitor
REC– CONT
C1
0
0
0
0
0
0
0
1
Attenuator Control
Trans. Attenuator
Rec. Attenuator
Transmitter mode
High-speed switching idle mode
High-speed switching idle mode
Receiver mode
Low-speed switching idle mode
Low-speed switching idle mode
Low-speed switching idle mode
Receiver mode
Transmitter Gain
C2
Trans. Level
Monitor
Rec. Level
Monitor
Operation mode
TLOG2
RLOG1
Line Interface
AN6175K
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