Datasheet

To Rx Front-End
INM
INP
Cable
10 k 10 k
Rx On/Off
Rx On/Off
Legend for Cable
Internal
TX_CTRL_SUP
1 k
100 PA 100 PA
GND Wires
PD Wires
LED Wires
AFE4490
SBAS602F –DECEMBER 2012–REVISED OCTOBER 2013 www.ti.com
DIAGNOSTICS
The device includes diagnostics to detect open or short conditions of the LED and photosensor, LED current
profile feedback, and cable on or off detection.
Photodiode-Side Fault Detection
Figure 75 shows the diagnostic for the photodiode-side fault detection.
Figure 75. Photodiode Diagnostic
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