LTC485 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LTC485

Low Power RS485 Interface Transceiver

Linear Technology 

LTC485

Test Circuits

A

R

VOD

R

VOC

B

485 F01

Figure 1. Driver DC Test Load

3V

DE

A

DI

B

RDIFF

A

CL1

B

CL2

RO

RE

15pF

485 F03

Figure 3. Driver/Receiver Timing Test Circuit

TEST POINT

S1

RECEIVER

OUTPUT

CRL

15pF

1k

S2

1k

VCC

485 F02

Figure 2. Receiver Timing Test Load

OUTPUT

UNDER TEST

500Ω

CL

S1

VCC

S2

485 F04

Figure 4. Driver Timing Test Load #2

Switching Time Waveforms

3V

DI

0V

B

A

VO

0V

–VO

1.5V

f = 1MHz, tr ≤ 10ns, tf ≤ 10ns

1.5V

tPLH

tPLH

1/2 VO

VO

1/2 VO

10%

tr

tSKEW

80%

VDIFF = V(A) – V(B)

tSKEW

90%

20%

tf

485 F05

Figure 5. Driver Propagation Delays

485fi

6

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