DS2148 datasheet(52/75 Pages) DALLAS

52 / 75 page

DS2148/Q48

52 of 75

PROTECTED INTERFACE USING INTERNAL RECEIVE TERMINATION

Figure 9-2

NOTES:

1) All resistor values are ±1%.

2) C1 = C2 = 0.1µF.

3) S is a 6V transient suppresser.

4) D1 to D8 are Schottky diodes.

5) The fuses are optional to prevent AC power line crosses from compromising the transformers.

6) Rp resistors exist to keep the Fuses from opening during a surge. If they are used, then the 60

receive termination resistance must be adjusted to match the line impedance.

7) The Rt resistors are used to increase the transmitter return loss (Table 9-1). No return loss is required

for T1 applications.

8) The transmit transformer turns ratio (N) would be 1:1.36 for 5V operation.

9) The 68

mF is used to keep the local power plane potential within tolerance during a surge.

RTIP

RRING

TTIP

TRING

Receive

Line

N:1

(larger winding

toward the network)

DS2148

0.47uF

(non-

polarized)

VDD (21)

VSS (22)

0.1uF

VDD (36)

VSS (35)

0.1uF

+VDD

0.01uF

2.048MHz

(this clock can also

be 1.544MHz for T1

only applications)

MCLK

+VDD

1:1

Fuse

+VDD

68uF

(optional)

Transmit

Line

Fuse

(optional)

10uF

0.1uF

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