LTC1535 Просмотр технического описания (PDF) - Linear Technology

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LTC1535

Isolated RS485 Transceiver

Linear Technology 

LTC1535

TEST CIRCUIT

**

CTX02-14659

1/2 BAT54C

2

ILOAD

IEXT

VCC2

+

10μF

IVCC2

VCC

+

10μF

1

RO

fRO = MAX

BAUD

RATE

2

1

VCC ST1

3

ST2

420kHz

1/2 BAT54C

2

11

GND2

14

VCC2

28 RO

RE

27

26 DE

25 DI

4 GND

1

LOGIC COMMON

1

A

16

R

B

15

RO2

17

Y

13

D

Z

12

SLO

18

1535 F01

FLOATING RS485 COMMON ** COOPER (888) 414-2645

2

Y

Z

C1

50pF

2

RL

C2

50pF

2

SLOW SLEW

RATE JUMPER

2

Figure 1. Self-Oscillation at Maximum Data Rate (Test Configuration for the First Six Typical Performance Characteristics Curves)

Y

VOD

Z

R

VOC

R

1535 F02

Figure 2. Driver DC Test Load

3V

DE

Y

R

DI

Z

R

CL1

CL2

1535 F04

Figure 4. Driver Timing Test Circuit

RECEIVER

OUTPUT

TEST POINT

S1

CRL

1k S2

1k

VCC

1535 F03

Figure 3. Receiver Timing Test Load

OUTPUT

UNDER TEST

500Ω

CL

S1

S2

1535 F05

VCC

Figure 5. Driver Timing Test Load

1535fb

8

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