le79r79 Zarlink Semiconductor, le79r79 Datasheet - Page 13

• Manufacturer Part Number: le79r79
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

2.
3.
4.
5.
6.
7.
8.
9.
10. Lower power is achieved by switching into low-battery state in standby. Standby loop current is returned to V
SLIC Device Decoding
Note:
* Only –1 and –2 performance grade device supports polarity reversal.
** For correct ground-start operation using Tip Open, V
a. Overload level is defined when THD = 1%.
b. Overload level is defined when THD = 1.5%.
Balance return signal is the signal generated at V
programmed impedance.
Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.
This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
Group delay can be greatly reduced by using a Z
less than 2 µs and increases 2WRL. The effect of group delay on linecard performance may also be compensated for by synthesizing
complex impedance with the QSLAC or DSLAC device.
70 Vpk provides 50 Vrms with a crest factor of 1.25 to a load of 1400 Ω with 2 • Rf = 100, and Rline = 70 Ω (1570 Ω).
Open Circuit V
R
selected.
D
must be greater than 56 kΩ.
State
6*
7*
0
1
2
3
4
5
AB
can be modified using R
C3 C2 C1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
See User-Programmable Components, on page 14.
0
1
0
1
0
1
0
1
SGH
Open Circuit
Ringing
Active
On-hook TX (OHT)
Reserved
Standby
Active Polarity Reversal
OHT Polarity Reversal
.
Two-Wire Status
TX
T
BAT1
network such as that shown in Note 1 above. The network reduces the group delay to
by V
Zarlink Semiconductor Inc.
on-hook battery must be used.
RX
. This specification assumes that the two-wire AC load impedance matches the
13
Loop detector
Ring trip
Ring trip
Loop detector
Loop detector
Loop detector
Loop detector
Loop detector
E1 = 1
for typical value of R
(DET) Output
Ring trip
Ring trip
Ground key
Ground key
Ground key
Ground key
Ground key
Ground key
E1 = 0
LTH
BAT1
.
regardless of the battery
B2EN = 1**
Battery
B2EN
V
B2EN
BAT1