Si2401
64
Preliminary Rev. 0.9
Reset settings
=
1111_0000 (0xF0)
SF6 (DAA6). DAA Low Level Functions 6
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
MINI[1:0]
DCV[1:0]
ACT[3:0]
Type
R/W
R/W
R/W
Bit
Name
Function
7:6
MINI[1:0]
Minimum Operational Loop Current.
Adjusts the minimum loop current at which the DAA can operate. Increasing the mini-
mum operational loop current can improve signal headroom at a lower TIP/RING volt-
age.
MINI[1:0] Min Loop Current
00
10 mA
01
12 mA
10
14 mA
11
16 mA
5:4
DCV[1:0]
TIP/RING Voltage Adjust.
These bits 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 volt-
age. Raising the TIP/RING voltage can improve signal headroom.
DCV[1:0] DCT Pin Voltage
00
3.1 V
01
3.2 V
10
3.35 V
11
3.5 V
3:0
ACT[3:0]
AC Termination Select.
ACT[3:0] AC Termination
0000
Real 600
Ω
termination that satisfies the impedance requirements
of FCC part 68, JATE, and other countries.
0011
Global complex impedance. Complex impedance that satisfies global
impedance requirements EXCEPT New Zealand. May achieve higher
return loss for countries requiring complex ac termination.
[220
Ω
+ (820
Ω
|| 120 nF) and 220
Ω
+ (820
Ω
|| 115 nF)].
0100
Complex impedance for use in New Zealand.
[370
Ω
+ (620
Ω
|| 310 nF)]
1111
Complex impedance that satisfies global impedance requirements.
