參數(shù)資料
型號: SI3056DC1-EVB
廠商: Silicon Laboratories Inc
文件頁數(shù): 66/94頁
文件大?。?/td> 0K
描述: DAUGHTERCARD DAA SI3056/SI3019
標準包裝: 1
主要目的: 電信,數(shù)據(jù)采集裝置(DAA)
已用 IC / 零件: Si3056
已供物品: 板,CD
Si3056
Si3018/19/10
Rev. 1.05
69
Reset settings = 0000_0000
Register 26. DC Termination Control
Bit
D7
D6D5D4D3
D2
D1D0
Name
DCV[1:0]
MINI[1:0]
ILIM
DCR
Type
R/W
Bit
Name
Function
7:6
DCV[1:0]
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.
DCV[1:0]
DCT Pin Voltage
00
3.1 V
01
3.2 V
10
3.35 V
11
3.5 V
5:4
MINI[1:0]
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.
MINI[1:0]
Min Loop Current
00
10 mA
01
12 mA
10
14 mA
11
16 mA
3:2
Reserved Do not write to these register bits.
1
ILIM
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.
0
DCR
DC Impedance Selection.
0=50
dc termination is selected. Use this mode for all standard applications.
1 = 800
dc termination is selected.
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