SLXT332QE.G2 Cortina Systems Inc, SLXT332QE.G2 Datasheet - Page 34

• Manufacturer Part Number: SLXT332QE.G2
• Manufacturer: Cortina Systems Inc

Specifications of SLXT332QE.G2

• Operating Supply Voltage (typ): 5V
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

LXT332
Datasheet
249075, Revision 2.0
26 June 2007
5.5
5.5.1
5.5.2
Figure 15
Cortina Systems
2.048 Mbps E1/CEPT Interface Applications
E1 Coaxial Applications
Figure 15
The LEN code should be set to 000 for coax. With 9.1 Ω Rt resistors in line with the 1:2
output transformers, the LXT332 produces 2.37 V peak pulses as required for coax
applications. As in the T1 application shown in
are used on the receive side.
E1 Twisted-Pair Applications
Figure 16
TRSTE pin tied to ground, the LXT332 operates in the bipolar data I/O mode. The JA
circuit is placed in the transmit path by the Low on JASEL. The line length equalizers are
controlled by the hardwired LEN inputs. With the LEN code set to 001 and 15 Ω Rt
resistors in line with the 1:2 output transformers, the LXT332 produces the 3.0 V peak
pulses required for this application. Center tapped 1:2 transformers are used on the
receive side.
A single clock source provides the 2.048 MHz input to MCLK and TCLK. The DFM pin
may routed to an LED driver or other indicator, or it may be left unconnected. Switches on
the TAOS, LLOOP and RLOOP inputs provide mode control and hardware reset
capability.
The transmit driver power supply pins (TVCC0 and TVCC1) are tied to a common bus
with 68 µF decoupling capacitors. The power supply for the remaining (non-driver)
circuitry (VCC) uses 1.0 µF and 0.1 µF decoupling capacitors.
Line Interface for E1 Coax Applications
®
LXT332 Dual T1/E1 Line Interface Unit with Crystal-less Jitter Attenuation
shows the line interface for a typical 2.048 Mbps E1 coaxial (75 Ω) application.
shows a typical 2.048 Mbps E1 twisted-pair (120 Ω) application. With the
LXT332
2
1 Typical value. Adjust for actual board
parasitics to obtain optimum return loss.
Protection diodes (Schottky):
International Rectifier: 11DQ04 or 10BQ060;
Motorola*: MBR0540T1.
RRINGn
TRINGn
RTIPn
TTIPn
2
+5V
1kΩ
1kΩ
Figure
+5V
Rr=150Ω
Rr=150Ω
Rt
Rt
=9.1Ω
=9.1Ω
470
pF
14, center tapped 1:2 transformers
1
2CT:1
1:2
5.5 2.048 Mbps E1/CEPT
Interface Applications
Page 34