SI3018FS Silicon Laboratories Inc, SI3018FS Datasheet - Page 69
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SI3018FS
Manufacturer Part Number
SI3018FS
Description
DAA - MODEM FA19 TELECOM/DATACO
Manufacturer
Silicon Laboratories Inc
Datasheet
1.SI3018-FS.pdf
(94 pages)
- Current page: 69 of 94
- Download datasheet (2Mb)
Register 26. DC Termination Control
Reset settings = 0000_0000
Bit
7:6
5:4
3:2
Name
Type
1
0
Bit
Reserved Do not write to these register bits.
DCV[1:0]
MINI[1:0]
Name
DCR
ILIM
D7
DCV[1:0]
R/W
TIP/RING Voltage Adjust.
Adjust the voltage on the DCT pin of the line-side device, which affects the TIP/RING voltage
on the line. Low voltage countries should use a lower TIP/RING voltage. Raising the TIP/
RING voltage improves signal headroom.
Minimum Operational Loop Current.
Adjusts the minimum loop current so the DAA can operate. Increasing the minimum opera-
tional loop current improves signal headroom at a lower TIP/RING voltage.
Current Limiting Enable.
0 = Current limiting mode disabled.
1 = Current limiting mode enabled. Limits loop current to a maximum of 60 mA per the TBR21
standard.
DC Impedance Selection.
0 = 50 Ω dc termination is selected. Use this mode for all standard applications.
1 = 800 Ω dc termination is selected.
DCV[1:0]
MINI[1:0]
D6
00
01
10
11
00
01
10
11
D5
DCT Pin Voltage
Min Loop Current
MINI[1:0]
R/W
3.1 V
3.2 V
3.35 V
3.5 V
10 mA
12 mA
14 mA
16 mA
D4
D3
Rev. 1.05
D2
Function
ILIM
R/W
D1
DCR
R/W
D0
Si3018/19/10
69
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