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CD22103AE Arkusz danych(PDF) 3 Page - Intersil Corporation

Numer części CD22103AE
Szczegółowy opis  CMOS HDB3 (High Density Bipolar 3 Transcoder for 2.048/8.448Mb/s Transmission Applications
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CD22103AE Arkusz danych(HTML) 3 Page - Intersil Corporation

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Functional Descriptionup
The CD22103A is designed to code and decode HDB3
signals which are coded as binary digital signals (NRZ-lN)
and (+HDB3 IN, -HDB3 IN), accompanied by sampling
clocks (CTX) and (CRX). The two binary coded HDB3
outputs, (+HDB3 OUT, -HDB3 OUT) may be externally
mixed to create the ternary HDB3 signals (See Figure 1).
The two binary HDB3 input signals have been split from the
input ternary HDB3 in an external line receiver.
The receiver decoder converts binary unipolar inputs
(+HDB3 IN, -HDB3 IN), which were externally split from
ternary bipolar HDB3 signals, and a synchronous clock
signal (CRX) into binary unipolar NRZ signals (NRZ-OUT).
Received signals not consistent with HDB3 coding rules are
detected as errors. The receiver error output (ERR) is active
high during one CRX period of each bit of received data that
is inconsistent with HDB3 coding rules.
An input string consisting of all ones (or marks) is detected
and signaled by a high level at the Alarm Signal (AIS) output.
The AIS output is set to a high level when less than three
zeros are received during two consecutive periods of the
Reset Alarm Inhibit Signal (RAIS). The AIS output is
subsequently reset to a low level when three or more zeros
are received during two periods of the reset signal (RAIS).
A diagnostic Loop-Test Mode may be entered by driving the
Loop Test Enable Input (LTE) high. In this mode the HDB3
transmitter outputs (+HDB3 OUT, -HDB3 OUT) are internally
connected to the HDB3 receiver inputs, and the external
HDB3 receiver inputs, and the external HDB3 receiver inputs
(+HDB3 IN, -HDB3 IN) are disabled. The NRZ binary output
signal (NRZ - OUT) corresponds to the NRZ binary input
signal (NRZ - IN) delayed by approximately 8 clock periods.
The Clock Receiver Output (CKR) is the product of the two
HDB3 input signals or’ed together. The CRX clock signal
may be derived from the CKR signal with external clock
extraction circuitry. In the Loop Test Mode (LTE = 1) CKR is
the product of the +HDB3 OUT and -HDB3 OUT signals
or’ed together.
The CD22103A may also be used to perform the AMI to
NRZ coding/decoding function. To use the CD22103A in this
mode, the HDB3/AMI control input is driven low.
Error Detection
Received HDB3/AMl binary input signals are checked for
coding violations, and an error signal (ERR) is generated as
described below.
HDB3 SIGNALS HDB3/AML = HIGH
The error signal (ERR) is flagged high for one CTX period if
a violation pulse (
±V) is received of the same polarity as the
last received violation pulse.
CRX to CKR (CRX = 8.448MHz)
Pretrigger
tP
5-
-
20
ns
Delay
tD
5-
-
20
ns
DYNAMIC OUTPUT
Transmitter Coder, CTX to HDB3 OUT:
Data Propagation Delay Time
tDD
3-
-
90
ns
Handling Delay Time
tHD
1-
4-
Clock Period
HDB3 OUT Output Pulse Width
(Clock duty cycle = 50%)
fCL = 2.048MHz
tW
3
238
-
260
ns
fCL = 8.448MHz
tW
353
-
65
Receiver Decoder
CRX to NRZ OUT:
Data Propagation Delay Times
tDD
4-
-
90
ns
Handling Delay Time
tHD
2-
4-
Clock Period
HDB3 IN to CKR
HDB3 Propagation Delay Time
LTE = 0
tIN CKR
4-
-
65
ns
LTE = 1
4
-
-
30
ns
Electrical Specifications
TA = -40
oC to 85oC for Plastic Package; -55oC to 125oC for Ceramic Package; V
DD = 4.5V to 5.5V;
CL = 15pF. (Continued)
PARAMETER
SYMBOL
FIGURE
MIN
TYP
MAX
UNITS
CD22103A


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