RING-TRIP COMPONENTS
RRT2 = 42 kΩ
CRT = 1.0 µF
VBAT1
---------------------------------------------------------------------------------------------------------------------------------------------------
RRT1 = 300 • CF •
• (RLRT + 150 + 2RF)
V
BAT1 – 3.5 – (15 µA • 300 • CF • (RLRT + 150 + 2RF))
where RLRT = Loop-detection threshold resistance for ring trip and CF = Crest factor of ringing signal (≈ 1.414)
Figure 3. Input via Output of Sinusoidal with DC Offset
VRING
RRef
Vbat/2
Figure 4. Feed Programming
A (TIP)
a
b
RSN
IL
RL
SLIC
RDC1
CDC
RDC2
B (RING)
RDC
Feed current programmed by R DC1 and RDC2
14
Le79R101 Data Sheet
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
