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CHEETAH 15K.7 FC PRODUCT MANUAL, REV. E 64
11.6.2 LED driver signals
Fault and Active LED signals are located in the FC-SCA connector (J1). See Table 30 for the output characteristics of the
LED drive signals.
11.6.3 FC Differential output
The serial output signal voltage characteristics are provided in Table 31. The outputs are not AC coupled in order to deliver
maximum signal without rise and fall time degradation. You must AC couple the receiver to isolate potentially different DC
characteristics of the outputs and the receiver.
Figure 16 provides the data output valid eye diagram relative to the bit cell time.
Figure 16. Transmit eye diagram
Table 30 LED drive signal
STATE CURRENT DRIVE AVAILABLE OUTPUT VOLTAGE
LED off, high 0 < I
OH
< 100μA
LED on, low I
OL
< -30 mA 0 < V
OL
< 0.8V
Table 31 FC Differential output characteristics
DESCRIPTION PARAMETER NOTES
Serial output voltage swing 600 < V
out
< 1300 mV Centered at 1.32V
Bit Time
Vout (mv)
XMIT Eye