參數(shù)資料
型號(hào): XRT73LC04AIV
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PQFP144
封裝: 20 X 20 MM, 1.40 MM HEIGHT, TQFP-144
文件頁數(shù): 39/64頁
文件大?。?/td> 360K
代理商: XRT73LC04AIV
XRT73LC04A
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
35
3.0
Figure 13 indicates the Receive Section consists of
the following blocks:
AGC/Equalizer
Peak Detector
Slicer
Clock Recovery PLL
Data Recovery
HDB3/B3ZS Decoder
The purpose of the Receive Section is to take an in-
coming attenuated/distorted bipolar signal from the
THE RECEIVE SECTION
line and encode it back into the TTL/CMOS format
where it can be received and processed by the Termi-
nal Equipment.
3.1
I
NTERFACING
THE
R
ECEIVE
S
ECTIONS
OF
THE
XRT73LC04A
TO
THE
L
INE
The design of the Receive Circuitry should be trans-
former-coupled to the Receive Section to the line.
The specification documents for E3, DS3, and STS-1
all specify 75 Ohm termination loads when transmit-
ting over coaxial cable. The recommended method to
interface the Receive Section to the line in a manner
is shown in Figure 22.
F
IGURE
22. R
ECOMMENDED
S
CHEMATIC
FOR
I
NTERFACING
THE
R
ECEIVE
S
ECTION
OF
THE
XRT73LC04A
TO
THE
L
INE
(T
RANSFORMER
-C
OUPLING
)
J1
BNC
T1
1:1
R1
37.4
R2
37.4
Channel (n)
RxPOS_(n)
RxNEG_(n)
RxClk_(n)
RTIP_(n)
RRing_(n)
RPOS_(n)
RNEG_(n)
RxClk_(n)
C1
0.01uf
Only One Channel Shown
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