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參數(shù)資料
| 型號(hào)： | LE79555-2VC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 411K |
| 代理商： | LE79555-2VC |
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10
Le79555 Data Sheet
Notes:
1. Unless otherwise noted, test conditions are VBAT1 = VBAT2 =
–
52 V, V
CC
= +5 V, R
L
= 600
, R
DC1
= R
DC2
= 13.02K, R
D
= 35.4 k
, no fuse resistors, C
HP
= 0.22 μF, C
DC
= 0.33 μF, C
CAS
= 0.33 μF, D1 = 1N400x, two-wire AC input impedance is
a 600
resistance synthesized by the programming network shown below.
2. a. Overload level is defined when THD = 1%.
b. Overload level is defined when THD = 1.5%.
3. Balance return signal is the signal generated at V
TX
by V
RX
. This specification assumes that the two-wire, AC-load impedance
matches the programmed impedance.
4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.
5. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
6. Tested with 0
source impedance. 2 M
is specified for system design only.
7. Group delay can be greatly reduced by using a Z
T
network such as that shown in Note 1. The network reduces the group
delay to less than 2 μs and increases 2WRL. The effect of group delay on linecard performance also may be compensated
for by synthesizing complex impedance with the QSLAC
or DSLAC
device.
8. Minimum current level guaranteed not to cause a false loop detect.
9. V
DC
/V
AB
Table 1.
SLIC Decoding
State
0
1
2
3
4
5
6
7
C3
0
0
0
0
1
1
1
1
C2
0
0
1
1
0
0
1
1
C1
0
1
0
1
0
1
0
1
Two-Wire Status
Reserved
Reserved
Active Polarity Reversal
Tip Open
Open Circuit
Ringing
Active
Standby
DET Output
X
X
Loop detector
Ground Key*
Ring trip
Ring trip
Loop detector
Loop detector
*Ground key selection in Tip Open is automatic. If longitudinal current is greater than 9 mA in
Active, Standby, or Tip Open, the DET will go low. Therefore, if in Active or Standby, DET may
be an indication of off hook, ground key, or both.
R
RX
= 150 k
R
T1
= 75 k
VTX
RSN
V
RX
R
T2
= 75 k
C
T1
= 120 pF
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