78P2351R
Serial 155M
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, Telcordia GR-253, ANSI T1.102
With the coaxial output port driving a 75Ω load, the output pulses conform to the templates in Figures 8 and 9.
These specifications are tested during production test. Consult application note for reference schematic, layout
guidelines, and recommended transformers.
PARAMETER
CONDITION
MIN
NOM
MAX
UNIT
Peak-to-peak Output Voltage
Template, steady state
0.9
1.04
1.1
V
(Fuse-trimmed to nominal target at
final test)
Rise/ Fall Time
10-90%
2
ns
ns
Negative Transitions
-0.1
-0.5
0.1
Positive Transitions at Interval
Boundaries
0.5
Transition Timing Tolerance
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
Page: 21 of 31
2006 Teridian Semiconductor Corporation
Rev. 2.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
