LTC1545_15 datasheet(10/16 Pages) LINER

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LTC1545

APPLICATIONS INFORMATION

Figure 12. V.10 Receiver Input Impedance

Figure 13. V.10 Receiver Configuration

Figure 14. Typical V.11 Interface

124

Ω

20k

LTC1344A

LTC1543

LTC1545

RECEIVER

1545 F15

51.5

Ω

51.5

Ω

10k

GND

20k

–10V

–3.25mA

3.25mA

–3V

10V

1545 F12

20k

LTC1545

RECEIVER

1545 F13

10k

GND

20k

GENERATOR

BALANCED

INTERCONNECTING

CABLE

LOAD

CABLE

TERMINATION

RECEIVER

100

Ω

MIN

1545 F14

GENERATOR

BALANCED

INTERCONNECTING

CABLE

LOAD

CABLE

TERMINATION

RECEIVER

1545 F11

Figure 11. Typical V.10 Interface

Figure 15. V.11 Receiver Configuration

In V.11 mode, all switches are off except S1 inside the

LTC1344A which connects a 103

Ω differential termina-

tion impedance to the cable as shown in Figure 15.

V.28 (RS232) Interface

A typical V.28 unbalanced interface is shown in Figure 16.

A V.28 single-ended generator output A with ground C is

connected to a single-ended receiver with input A

' con-

nected to A, ground C

' connected via the signal return

ground C.

In V.28 mode, all switches are off except S3 inside the

LTC1543/LTC1545 which connects a 6k (R8) impedance

to ground in parallel with 20k (R5) plus 10k (R6) for a

combined impedance of 5k as shown in Figure 17. The

noninverting input is disconnected inside the LTC1543/

LTC1545 receiver and connected to a TTL level reference

voltage for a 1.4V receiver trip point.

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