LTC1544 Просмотр технического описания (PDF) - Linear Technology

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LTC1544

Software-Selectable Multiprotocol Transceiver

Linear Technology 

LTC1544

APPLICATIONS INFORMATION

V.35 Interface

A typical V.35 balanced interface is shown in Figure 18. A

V.35 differential generator with outputs A and B with

ground C is connected to a differential receiver with

ground C', inputs A' connected to A, B' connected to B. The

V.35 interface requires a T or delta network termination at

the receiver end and the generator end. The receiver

differential impedance measured at the connector must be

100Ω␣ ±10Ω, and the impedance between shorted termi-

nals (A' and B') and ground C' must be 150Ω ±15Ω.

In V.35 mode, both switches S1 and S2 inside the LTC1344A

are on, connecting the T network impedance as shown in

Figure 19. The switch in the LTC1543 is off. The 30k input

impedance of the receiver is placed in parallel with the T

network termination, but does not affect the overall input

impedance significantly.

GENERATOR

BALANCED

INTERCONNECTING

CABLE

LOAD

CABLE

TERMINATION

RECEIVER

A

A'

50Ω

125Ω

50Ω

125Ω

50Ω

B

C

50Ω

B'

C'

1544 F18

Figure 18. Typical V.35 Interface

A'

A

R1 LTC1344A

51.5Ω

R5

R8 20k

6k

S1

R3

S3

S2 124Ω

R2

51.5Ω

B'

C'

R4

B

20k

GND

LTC1543

R6 RECEIVER

10k

R7

10k

1544 F19

Figure 19. V.35 Receiver Configuration

12

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