Link Budget Examples
Cable
Typical transmit couple power to fiber (µW)
Minimum LED responsivity (A/W)
Available current (µA)
Minimum ACS101A sensitivity (nA)
Link budget (dB)
200 micron
1200
0.05
60
500
20
100 micron
260
0.06
15.6
500
15
62.5 micron
100
0.1
10
500
13
50 micron
40
0.12
4.8
500
10
Note 7: Link Budget Calculations for a typical 1A-212 LED from MITEL Semiconductor.
t
t
wh
wl
TxCL and RxCL clock pulse widths
2
tr
t
f
90 % 90 %
10 %
10 %
Digital Outputs rise and fall times
TxCL
t
t
sut
ht
RxCL
t
t
sur
hr
TxD
RxD
Transmit set-up and hold times
Receive set-up and hold times
Figure 3. Timing diagrams
9
ACS101A Issue 1.2 October 1999.