參數(shù)資料
型號: XRT81L27IV
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
中文描述: DATACOM, PCM TRANSCEIVER, PQFP128
封裝: TQFP-128
文件頁數(shù): 24/30頁
文件大小: 194K
代理商: XRT81L27IV
XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. 1.1.0
á
22
2.5
The driver block will take the TP and TN pulses out of
the Pulse Shaping circuit and apply these to the TTIP
and TRING pins. Output drive control is available
from either a dedicated signal or (in Host mode) from
one of register control bits to turn the channel “off” by
placing the drivers in a high impedance state.
T
HE
L
INE
D
RIVER
BLOCK
2.6
I
NTERFACING
THE
T
RANSMIT
S
ECTIONS
OF
THE
XRT81L27
TO
THE
L
INE
In both (75
or 120
) applications, the user is ad-
vised to interface the Transmitter to the Line, using
the termination as shown in Figure 12. This includes
1:2 transformer with the intrinsic impedance of the
line used as a termination resistance.
The configuration differs only in the type of line con-
nects, The internal circuit adjusts to the load imped-
ance
F
IGURE
11. ITU-T G.703 P
ULSE
T
EMPLATE
1
1
1
1
1
1
269 ns
(244 + 25)
194 ns
(244 – 50)
244 ns
219 ns
(244 – 25)
488 ns
(244 + 244)
0%
50%
2
V = 100%
Nominal pulse
Note
– V corresponds to the nominal peak value.
2
2
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