XRT83SL30(2003) Просмотр технического описания (PDF) - Exar Corporation

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XRT83SL30
(Rev.:2003)

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

Exar Corporation 

XRT83SL30

áç

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

REV. P1.0.4

PRELIMINARY

FUNCTIONAL DESCRIPTION

The XRT83SL30 is a fully integrated single channel short-haul transceiver intended for T1, J1 or E1 systems.

Simplified block diagrams of the device are shown in Figure 1, Host mode and Figure 2, Hardware mode.

In T1 applications, the XRT83SL30 can generate five transmit pulse shapes to meet the short-haul Digital

Cross-connect (DSX-1) template requirement. It also provides programmable transmit output pulse generator

that can be used for output pulse shaping allowing performance improvement over a wide variety of conditions.

The operation and configuration of the XRT83SL30 can be controlled through a serial microprocessor Host

interface or, by Hardware control.

MASTER CLOCK GENERATOR

Using a variety of external clock sources, the on-chip frequency synthesizer generates the T1 (1.544MHz) or

E1 (2.048MHz) master clocks necessary for the transmit pulse shaping and receive clock recovery circuit.

There are two master clock inputs MCLKE1 and MCLKT1. In systems where both T1 and E1 master clocks are

available these clocks can be connected to the respective pins.

In systems that have only one master clock source available (E1 or T1), that clock should be connected to both

MCLKE1 and MCLKT1 inputs for proper operation. T1 or E1 master clocks can be generated from 8kHz,

16kHz, 56kHz, 64kHz, 128kHz and 256kHz external clocks under the control of CLKSEL[2:0] inputs according

to Table 1.

NOTE: EQC[4:0] determine the T1/E1 operating mode. See Table 5 for details.

FIGURE 4. TWO INPUT CLOCK SOURCE

2.048MHz

+/-50ppm

1.544MHz

+/-50ppm

Two Input Clock Sources

MCLKE1

MCLKT1

MCLKOUT

1.544MHz

or

2.048MHz

FIGURE 5. ONE INPUT CLOCK SOURCE

Input Clock Options

8kHz

16kHz

56kHz

64kHz

128kHz

256kHz

1.544MHz

2.048MHz

One Input Clock Source

MCLKE1

MCLKT1

MCLKOUT

1.544MHz

or

2.048MHz

17

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