XRT83SL30(2003) データシートの表示（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 

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XRT83SL30

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

PRELIMINARY

REV. P1.0.4

JITTER ATTENUATOR

SIGNAL NAME

JABW

JASEL1

JASEL0

PIN #

46

47

48

TYPE

I

I

DESCRIPTION

Jitter Attenuator Bandwidth

In Hardware and E1 mode, when JABW=”0” the jitter attenuator bandwidth is

10Hz (normal mode). Setting JABW to “1” selects a 1.5Hz Bandwidth for the

Jitter Attenuator and the FIFO length will be automatically set to 64 bits. In T1

mode the Jitter Attenuator Bandwidth is always set to 3Hz, and the state of

this pin has no effect on the Bandwidth. See table under JASEL[1:0] pin,

below.

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

Jitter Attenuator select pin 1

Jitter Attenuator select pin 0

In Hardware Mode, JASEL0, JASEL1 and JABW pins are used to place the

jitter attenuator in the transmit path, the receive path or to disable it and set

the jitter attenuator bandwidth and FIFO size per the following table.

JABW JASEL1 JASEL0 JA Path

0

0

0

Disabled

JA BW (Hz)

T1

E1

------ ------

FIFO Size

T1/E1

------

0

0

1

Transmit

3

10

32/32

0

1

0

Receive

3

10

32/32

0

1

1

Receive

3

10

64/64

1

0

0

Disabled ------ ------

--------

1

0

1

Transmit

3

1.5

32/64

1

1

0

Receive

3

1.5

32/64

1

1

1

Receive

3

1.5

64/64

NOTE: These pins are internally pulled "Low" with 50kΩ resistors.

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