78P2351R 查看數據表（PDF） - Teridian Semiconductor Corporation
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78P2351R Datasheet PDF : 31 Pages
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DESCRIPTION
The 78P2351R is Teridian’s second generation Line
Interface Unit (LIU) for 155 Mbit/s electrical SDH
interfaces (STM1e). The device is a single chip
solution that includes an integrated Clock & Data
Recovery in both the transmit and receive paths for
easy, cost efficient NRZ to CMI conversion.
The device interfaces to 75Ω coaxial cable through
wideband transformers and can handle over 12.7dB
of cable loss. By eliminating the needs for
synchronous clocks, the small 78P2351R (7x7mm
MLF package) is ideal for new STM1e (ES1) Small
Form-factor Pluggable (SFP) transceiver modules.
APPLICATIONS
• STM1e SFP modules
• SDH/ATM Line Cards
• Add Drop Multiplexers (ADMs)
• PDH/SDH Test Equipment
• Digital Microwave Radios
• Multi-Service Switches
78P2351R
Serial 155M
NRZ to CMI Converter
DATA SHEET
AUGUST 2006
FEATURES
• ITU-T G.703 compliant, adjustable cable driver
for 155.52 Mbps CMI-coded coax transmission
• Integrated adaptive CMI equalizer and CDR in
receive path handles over 12.7dB of cable loss
• LVPECL-compatible system interface with
integrated CDR in transmit path for flexible NRZ
to CMI conversion
• Configurable via HW control pins or 4-wire serial
port interface
• Compliant with ANSI T1.105.03-1994; ITU-T
G.813, G.825, G.958; and Telcordia GR-253-
CORE for jitter performance
• Receive Loss of Signal (Rx LOS) detection
• Receive Monitor Mode handles up to 20dB of
flat loss (at max 6dB cable loss)
• Optional fixed backplane equalizer compensates
for up to 1.5m of trace
• Operates from a single 3.3V supply
• Available in a small 7x7mm 56-pin QFN
package
• Industrial Temperature: -40˚C to +85˚C
BLOCK DIAGRAM
75ohm Coax
(CMI Encoded)
78P2351R
Adaptive
Eq.
CDR
CDR
Fixed
Eq.
CMI
ENDEC
Tx Disable
TD +
TD -
RD +
RD -
LVPECL Data
(NRZ Encoded)
Rx LOS
Page: 1 of 31
2006 Teridian Semiconductor Corporation
Rev. 2.1
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