SI3011-F-FSR Silicon Laboratories Inc, SI3011-F-FSR Datasheet - Page 31

• Manufacturer Part Number: SI3011-F-FSR
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3011-F-FSR

• Lead Free Status / RoHS Status: Supplier Unconfirmed

5.26. Overload Detection
The Si3050 can be programmed to detect an overload
condition that exceeds the normal operating power
range of the DAA circuit. To use the overload detection
feature, the following steps should be followed:
1. Set the OH bit (Register 5, bit 0) to go off-hook, and
2. Enable overload detection by then setting the OPE
If the DAA senses an overload situation it automatically
presents an 800  impedance to the line to reduce the
hookswitch current. At this time, the DAA also sets the
OPD bit (Register 19, bit 0) to indicate that an overload
condition exists. The line current detector within the
DAA has a threshold that is dependent on the ILIM bit
(Register 26). When ILIM = 0, the overload detection
threshold equals 160 mA. When ILIM = 1, the overload
detection threshold equals 60 mA. The OPE bit should
always be cleared before going off-hook.
Si3050
DTX
DRX
wait 25 ms to allow line transients to settle.
bit (Register 17, bit 3).
To
Attenuation
Steps
1 dB
RXA2
TXG2
Steps
1 dB
Gain
Link
Digital
Filter
IIRE
TXG3
TXA3
Gain/ATT
0.1 dB
Steps
Gain/ATT
0.1 dB
Steps
Figure 26. Si3050 Signal Flow Diagram
Figure 25. Si3011 Signal Flow Diagram
RXG3
RXA3
Digital
Filter
IIRE
Steps
Gain
1 dB
RXG2
DAC
ADC
Rev. 1.11
Selectable
Attenuation
TXA2
200 Hz
Steps
HPF
1 dB
5.27. Gain Control
The Si3050 supports multiple levels of gain and
attenuation for the transmit and receive paths.
The TXG2 and RXG2 bits (Registers 38–39) enable
gain or attenuation in 1 dB increments for the transmit
and receive paths (up to 12 dB gain and 15 dB
attenuation). The TGA2 and RGA2 bits select either
gain or attenuation. The TXG3 and RXG3 bits
(Registers 40–41) enable gain or attenuation in 0.1 dB
increments up to 1.5 dB for the transmit and receive
paths. The TGA3 and RGA3 bits select either gain or
attenuation. The transmit and receive paths can be
individually muted with the TXM and RXM bits
(Register 15). The signal flow through the Si3050 and
the Si3011 is shown in Figures 25–26.
Analog
Hybrid
Hybrid
Digital
ACT
Si3050 + Si3011
0.6 Hz
HPF
Link
TX
To Si3011
CO
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