DS21448LDK Maxim Integrated Products, DS21448LDK Datasheet - Page 39
DS21448LDK
Manufacturer Part Number
DS21448LDK
Description
KIT DESIGN LIU DS21448L T1/J1/E1
Manufacturer
Maxim Integrated Products
Datasheet
1.DS21448L.pdf
(60 pages)
Specifications of DS21448LDK
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Figure 7-4. Dual Connector-Protected Interface Using Receive Termination
BALANCED LINE
(100Ω/120Ω)
UNBALANCED
LINE (75Ω)
UNBALANCED
LINE (75Ω)
BALANCED LINE
(100Ω/120Ω)
NOTE 1: REFER TO APPLICATION NOTE 384 FOR A COMPLETE DISCUSSION OF THIS CIRCUIT.
NOTE 2: ALL RESISTOR VALUES ARE ±1%.
NOTE 3: THE FUSES ARE OPTIONAL TO PREVENT AC POWER LINE CROSSES FROM COMPROMISING THE TRANSFORMERS.
NOTE 4: S IS A SIDACTOR.
NOTE 5: THE R
NOTE 6: THE 68 µ F IS USED TO KEEP THE LOCAL POWER PLANE POTENTIAL WITHIN TOLERANCE DURING A SURGE.
FOR T1 APPLICATIONS.
T
51.1
RESISTORS ARE USED TO INCREASE THE TRANSMITTER RETURN LOSS
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
S
S
S
S
S
S
S
S
0.22µF
0.22µF
L1
L1
0.22µF
0.22µF
1.6:1
0.8:1
0.8:1:1CT
2:1
1:1
0.8:1:1CT
39 of 60
60
S
S
1.0µF
0.1µF
60
R
R
t
t
(Table 7-C).
RTIP
TTIP
TRING
RRING
Semiconductor
DS21448
Dallas
NO RETURN LOSS IS REQUIRED
MCLK
V
V
V
V
DD
DD
SS
SS
0.01µF
0.1µF
2.048MHz (THIS CAN ALSO
BE 1.544MHz FOR T1 ONLY
OPERATION)
0.1µF
10µF
0.01µF
V
DD
+
68µF
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