FEDL 7012-03-01
1
Semiconductor
ML7012-03
Analog Interface
Symbol
AOUT
RCI
RCAO
TXAI
TXAN
TXAP
AIN
GSR
SG
I/O
O
I
O
I
O
O
I
O
O
Transmit analog output pin
When
PDN/RST
=
“0”,
AOUT is in a high impedance state.
Operational amplifier input pin constituting transmit RC active
Operational amplifier output pin constituting transmit RC active
When
PDN/RST
=
“0”,
RCAO is in a high impedance state.
Input pin of the line transformer drive amplifier
Output pin of the line transformer drive amplifier (1)
When
PDN/RST
=
“0”,
TXAN is in a high impedance state.
Output pin of the line transformer drive amplifier (2)
When
PDN/RST
=
“0”,
TXAP is in a high impedance state.
Input pin of the receive input amplifier
Output pin of the receive input amplifier
When
PDN/RST
=
“0”,
GSR is in a high impedance state.
Pin to connect capacitors for the SG circuit
When
PDN/RST
=
“0”,
SG is in a high impedance state.
Description
PSTN Line Control Interface
Symbol
I/O
Description
Off-hook and pulse dial control signal output pin (*1)
RLY1
O
0: On-hook or break state of pulse dial
1: Off-hook or make state of pulse dial
When
PDN/RST
=
“0”,
RLY1 outputs “0”.
The control signal output pin to disconnect interlinked telephones (*1)
RLY2
O
0: PSTN is connected with interlinked telephones
1: PSTN is disconnected with interlinked telephones but connected with modem
When
PDN/RST
=
“0”,
RLY2 outputs “0”.
Incoming signal input pin (*2)
RII
I
Input
“0”
while detecting an incoming signal
Input
“1”
while not detecting an incoming signal
Speaker control signal output pin
SPK
O
0: speaker On
1: speaker Off
When
PDN/RST
=
“0”,
SPK outputs
“1”.
5/22
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