XRT83L30 datasheet(9/78 Pages) EXAR

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XRT83L30

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

PRELIMINARY

REV. P1.3.0

TRANSMITTER

SIGNAL NAME

PIN #TYPE

DESCRIPTION

TTIP

Transmitter Tip Output

Positive differential transmit output to the line.

TRING

Transmitter Ring Output

Negative differential transmit output to the line.

TPOS

TDATA

Transmitter Positive Data Input

In dual-rail mode, this signal is the positive-rail input data for the transmitter.

Transmitter Data Input

In single-rail mode, this pin is used as the NRZ input data for the transmitter.

NOTE: Internally pulled “Low” with a 50k

Ω resistor.

TNEG

CODES

Transmitter Negative NRZ Data Input

In dual-rail mode, this signal is the negative-rail input data for the transmitter.

In single-rail mode, this pin can be left unconnected.

Coding Select

In Hardware mode and with single-rail mode selected, connecting this pin

"Low" enables HDB3 in E1 or B8ZS in T1 encoding and decoding. Connect-

ing this pin "High" selects AMI data format.

NOTE: Internally pulled “Low” with a 50k

Ω resistor.

TCLK

Transmitter Clock Input

E1 rate at 2.048MHz ± 50ppm

T1 rate at 1.544MHz ± 32ppm

During normal operation, both in Host mode and Hardware mode, TCLK is

used for sampling input data at TPOS/TDATA and TNEG/CODES while

MCLK is used as the timing reference for the transmit pulse shaping circuit.

TCLKE

Transmit Clock Edge

In Hardware mode, with this pin set to a "High", transmit input data is sam-

pled at the rising edge of TCLK. With this pin tied "Low", input data are sam-

pled at the falling edge of TCLK.

NOTE: Internally pulled “Low” with a 50k

Ω resistor.

TXON

Transmitter Turn On

In Hardware mode, setting this pin "High" turns on the Transmit Section. In

this mode, when TXON = “0”, TTIP and TRING driver outputs will be tri-

stated.

NOTES:

1. Internally pulled "Low" with a 50k

Ω resistor.

2. In Hardware mode only, the receiver is turned on at power-up.

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