DS21448A1 Maxim Integrated, DS21448A1 Datasheet - Page 39

• Manufacturer Part Number: DS21448A1
• Description: Network Controller & Processor ICs 3.3V E1/T1/J1 Quad Interface
• Manufacturer: Maxim Integrated

Specifications of DS21448A1

• Part # Aliases: 90-21448-0A1

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