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XRT83L30

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

Exar Corporation 

XRT83L30

REV. 1.0.1 SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

TERMINATIONS

SIGNAL NAME

TERSEL1

TERSEL0

PIN #

43

42

TYPE

I

DESCRIPTION

Termination Impedance Select pin 1

Termination Impedance Select pin 0

In the Hardware mode and in the Internal Termination mode (TXTSEL=”1”

and/or RXTSEL=”1”) TERSEL[1:0] control the transmit and receive termina-

tion impedance according to the following table:

TERSEL1 TERSEL0

0

0

0

1

1

0

1

1

Termination

100Ω

110Ω

75 Ω

120Ω

RXRES1

RXRES0

In the Internal Termination mode, the receive termination is realized com-

pletely by internal resistors or the combination of internal and one fixed exter-

nal resistor (see description for RXRES[1:0] pins). In the internal termination

mode the transformer ratio of 1:2 and 2:1 is required for the transmitter and

receiver respectively with the transmitter output AC coupled to the trans-

former.

NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.

51

I

Receive External Resistor Control pin 1

52

Receive External Resistor Control pin 0

In Hardware mode, RXRES[1:0] pins selects the required value of the exter-

nal fixed resistor for the receiver according to the following table. This mode

is only available in the internal impedance mode by pulling RXTSEL “High”.

RXRES1 RXRES0

RX Fixed Resistor

0

0

No External Fixed Resistor

0

1

240Ω

1

0

210Ω

1

1

150Ω

NOTE: Internally pulled “Low” with 50kΩ resistor.

12

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