XRT83L30_06 Datasheet, PDF (10/78 Pages) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.1
TRANSMITTER
SIGNAL NAME
TTIP
TRING
TPOS
TDATA
TNEG
CODES
TCLK
TCLKE
TXON
PIN #
8
10
61
62
60
57
58
TYPE
O
O
I
DESCRIPTION
Transmitter Tip Output
Positive differential transmit output to the line.
Transmitter Ring Output
Negative differential transmit output to the line.
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 50kΩ resistor.
I
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 50kΩ resistor.
I
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.
I
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 50kΩ resistor.
I
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 50kΩ resistor.
2. In Hardware mode only, the receiver is turned on at power-up.
7