78P2351R 155Mbps NRZ to CMI Converter
ELECTRICAL SPECIFICATIONS (continued)
TRANSMITTER SPECIFICATIONS FOR CMI INTERFACE
Bit Rate: 155.52Mbits/s 20ppm
Code: Coded Mark Inversion (CMI)
Relevant Specification: ITU-T G.703
With the coaxial output port driving a 75Ω load, the output pulses conform to the templates in Figures 7 and 8.
These specifications are tested during production test.
PARAMETER
Peak-to-peak Output Voltage
Rise/ Fall Time
CONDITION
Template, steady state
10-90%
MIN
0.9
NOM
MAX
1.1
2
UNIT
V
ns
Negative Transitions
-0.1
-0.5
0.1
Positive Transitions at Interval
Boundaries
0.5
Transition Timing Tolerance
ns
Positive Transitions at mid-
interval
-0.35
0.35
The following specifications are not tested during production test. They are included for information only.
Note that the return loss depends on the board layout and the particular transformer used.
PARAMETER
Output Impedance
Return Loss
CONDITION
MIN
NOM
1
8
MAX
UNIT
MΩ
pF
Driver is open drain
7MHz to 240MHz
15
dB
19
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
