XRT7296_10 Datasheet, PDF (1/2 Pages) Exar Corporation – XRT7296 DS3 STS-1 E3 Integrated Line Transmitter

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XRT7296 DS3 STS-1 E3 Integrated Line Transmitter
General Description:
The XRT7296 is a fully integrated PCM Line Driver IC intended for
DS3 (44.736Mbps) or E3(34.368Mbps) applications. It can also be
used for transmitting SONET STS-1 (51.84Mbps) signals over
coaxial cable. The IC is designed to complement either XRT7295
DS3/SONET STS-1 or XRT7295E E3 Integrated Line Receivers. The
XRT7296 converts input clock and dual-rail unipolar data into AMI
pulses according to AT&T Technical Advisory No. 34 or CCITT G.703
recommendations.
The device provides B3ZS (DS3) or HDB3 (E3) encoding functions for data to be transmitted to the line. A
complimentary decoder circuit is also included in the chip for decoding received signals from an external
line receiver. Both encoder and decoder functions can be disabled independently through external control
pins. In the receive direction, coding errors and bipolar violations are detected and flagged at an output
pin.
On-chip pulse shaper circuitry eliminates normally required external components for line equalization to
meet the cross-connect template. For system level trouble-shooting and testing, both local and remote
loop-backs are possible with the built-in loop-back circuit.
The XRT7296 is manufactured using BiCMOS
technology and is packaged in a 28-pin PDIP or SOJ
packages. The device requires a single 5V power
supply and consumes a maximum power of 700mW.
(Line current feed + device dissipation).
Key Features:
 Fully Integrated Transmit Interface for
DS3/E3/STS-1
 Integrated Pulse Shaping Circuit
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