78P2351R
155M NRZ to
CMI Converter
PRELIMINARY DATASHEET
FEBRUARY 2004
DESCRIPTION
The 78P2351R is TDK’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 the transmit path for easy, cost efficient
NRZ to CMI conversion.
The device interfaces to 75Ω coaxial cable through
wideband transformers and can handle over 15dB of
cable loss.
By integrating CDR capabilities in the transmit path,
the small 78P2351R (7x7mm MLF package) is also
ideal for new STM1e Small Form-factor Pluggable
(SFP) modules.
APPLICATIONS
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STM1e SFP modules
SDH/ATM Line Cards
Add Drop Multiplexers (ADMs)
PDH/SDH test equipment
FEATURES
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BLOCK DIAGRAM
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 15dB of cable loss
Serial, 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
Provides G.783 compliant Loss of Signal (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
75ohm Coax
(CMI Encoded)
78P2351R
Tx Disable
Fixed
Eq.
CDR
TD +
TD -
Adaptive
Eq.
CMI
ENDEC
CDR
RD +
RD -
Rx LOS
LVPECL Data
(NRZ Encoded)
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TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
