CS61535A-IL1 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS61535A-IL1' PDF : 48 Pages View PDF
CS61535A
LEN2
0
1
1
1
1
0
0
0
0
LEN1
1
0
0
1
1
0
0
1
1
LEN0
1
0
1
0
1
1
0
0
1
OPTION SELECTED
0-133 FEET
133-266 FEET
266-399 FEET
399-533 FEET
533-655 FEET
AT&T CB113
(CS61535A only)
CCITT G.703
FCC Part 68, Option A
ANSI T1.403
APPLICATION
DSX-1
ABAM
(AT&T 600B
or 600C)
REPEATER
2.048 MHz E1
CSU NETWORK
INTERFACE
Table 3. Line Length Selection
CS61535A line driver is designed to drive a 75 Ω
equivalent load.
width will meet the G.703 pulse shape template
shown in Figure 9, and specified in Table 4.
For E1 applications, the CS61535A driver pro-
vides 14 dB of return loss during the transmission
of both marks and spaces. This improves signal
quality by minimizing reflections off the trans-
mitter. Similar levels of return loss are provided
for T1 applications.
The CS61535A transmitter will detect a failed
TCLK, and will force the TTIP and TRING out-
puts low.
For T1 DSX-1 applications, line lengths from 0 to
655 feet (as measured from the transmitter to the
DSX-1 cross connect) are selectable. The five
partition arrangement meets ANSI T1.102-1993
requirements when using ABAM cable. A typical
output pulse is shown in Figure 8. These pulse
settings can also be used to meet CCITT pulse
shape requirements for 1.544 MHz operation.
NORMALIZED
AMPLITUDE
1.0
0.5
AT&T CB 119
SPECIFICATION
For T1 Network Interface applications, additional
0
options are provided. Note that the optimal pulse
width for Part 68 (324 ns) is narrower than the
optimal pulse width for DSX-1 (350 ns). The
CS61535A automatically adjusts the pulse width -0.5
based upon the "line length " selection made.
0
CS61535A
OUTPUT
PULSE SHAPE
250
500
750
TIME (nanoseconds)
1000
The E1 G.703 pulse shape is supported with line
length selection LEN2/1/0=0/0/0. The pulse
Figure 8. Typical Pulse Shape at DSX-1 Cross Connect
For coaxial cable,
75Ω loa d a nd
transformer specified
in Application Section.
For shielded twisted
pair, 120Ω load and
transformer specified
in Application Section.
Nominal peak voltage of a mark (pulse)
2.37 V
3V
Peak voltage of a space (no pulse)
0 ±0.237 V
0 ±0.30 V
Nominal pulse width
244 ns
Ratio of the amplitudes of positive and negative
pulses at the center of the pulse interval
0.95 to 1.05*
Ratio of the widths of positive and negative
pulses at the nominal half amplitude
0.95 to 1.05*
* When configured with a 0.47 µF nonpolarized capacitor in series with the TX transformer
primary as shown in Figures A1, A2 and A3.
Table 4. CCITT G.703 Specifications
12
DS40F2
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