
Si2400
88 Rev. 1.3
10. Pin Descriptions: Si3015
Table 30. 3015 Pin Descriptions
Pin # Pin Name Description
1QE2Transistor Emitter 2.
Connects to the emitter of Q4.
2 DCT
DC Termination.
Provides dc termination to the telephone network
3IGND
Isolated Ground.
Connects to ground on the line-side interface. Also connects to capacitor C2.
4C1B
Isolation Capacitor 1B.
Connects to one side of isolation capacitor C1.
5RNG1
Ring 1.
Connects through a capacitor to the TIP lead of the telephone line. Provides the ring
and caller ID signals to the Si2400.
6RNG2
Ring 2.
Connects through a capacitor to the RING lead of the telephone line. Provides the ring
and caller ID signals to the Si2400.
7QB
Transistor Base.
Connects to the base of transistor Q3.
8QE
Transistor Emitter.
Connects to the emitter of Q3.
9VREG
Voltage Regulator.
Connects to an external capacitor to provide bypassing for an internal power supply.
10 VREG2
Voltage Regulator 2.
Connects to an external capacitor to provide bypassing for an internal power supply.
11 REF
Reference.
Connects to an external resistor to provide a high accuracy reference current.
12 REXT2
External Resistor 2.
Sets the complex ac termination impedance.
13 REXT
External Resistor.
Sets the real ac termination impedance.
1
2
3
4
5
6
7
8
9
10
11
12
13
16
15
14
QE2
DCT
IGND
C1B
RNG1
RNG2
QB
QE
FILT2
FILT
RX
REXT
REXT2
REF
VREG2
VREG
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