DJLXT380LE.B4 Cortina Systems Inc, DJLXT380LE.B4 Datasheet - Page 24

• Manufacturer Part Number: DJLXT380LE.B4
• Manufacturer: Cortina Systems Inc

Specifications of DJLXT380LE.B4

• Lead Free Status / RoHS Status: Not Compliant

LXT380 — Octal E1 G.703 Transceiver
2.5
24
Figure 6. External Transmit/Receive Line Circuitry
Line Protection
As shown in
into the device. Due to the high receiver impedance (70 k typical), the resistors do not affect the
receiver sensitivity. In the transmit side, Schottky diodes D1-D4 protect the output driver. While
not mandatory for normal operation, these protection elements are strongly recommended to
improve the design robustness.
1
2
3
Typical value. Adjust for actual board parasitics to obtain optimum return loss.
Common decoupling capacitor for all TVCC and TGND pins.
Transformer turns ratio tolerance is ± 2%. See Test Specifications Section for transformer specifications.
Figure
68 F
3.3V
6, the 1 k series resistors protect the receiver against current surges coupled
0.1 F
1
3.3V
VCC
GND
COMPONENT
0.1 F
D1 - D4
TVS1
R
R
(ONE CHANNEL)
T
R
LXT380
3.3V
TVS1
75 COAX
11
37.5
RRING
TRING
RTIP
TTIP
INTERNATIONAL RECTIFIER
MOTOROLA
±1%
11DQ04 or 10BQ060
SMLVT 3V3 3.3V
SGS-THOMSON
±1%
TVCC
TVCC
APPLICATION
D4
D3
D2
D1
1k
1k
120 TWISTED PAIR
MBR0540T1
R
560pF
R
T
2
T
11
60
R
R
R
R
±1%
±1%
0.22 F
1:2
3
1:1
3
Tx LINE
Datasheet
Rx LINE