ADM2485(RevPrk) Просмотр технического описания (PDF) - Analog Devices

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ADM2485
(Rev.:RevPrk)

High Speed Isolated RS-485 Transceiver with Integrated Transformer Driver

Analog Devices 

Preliminary Technical Data

SWITCHING CHARACTERISTICS

3V

1.5V

0V

B

1/2VO

VO

tPLH

A

1.5V

tPHL

tSKEW = |tPLH – tPHL|

VO

0V

–VO

90% POINT

10% POINT

tR

90% POINT

10% POINT

tF

Figure 12. Driver Propagation Delay, Rise/Fall Timing

A–B

0V

0V

RxD

tPLH

1.5V

tPHL

tSKEW = |tPLH – tPHL|

1.5V

VOH

VOL

Figure 13. Receiver Propagation Delay

ADM2485

RTS

A–B

A–B

0.5VDD1

tZL

2.3V

tZH

2.3V

0.5VDD1

tLZ

0.7VDD1

0.3VDD1

VOH +0.5V

VOL

tHZ

VOH –0.5V

VOH

0V

RE

RxD

RxD

0V

Figure 14. Driver Enable/Disable Timing

0.5VDD1

tZL

1.5V

tZH

O/P LOW

O/P HIGH

1.5V

0.5VDD1

tLZ

0.7VDD1

0.3VDD1

VOH +0.5V

VOL

tHZ

VOH

VOH –0.5V

Figure 15. Receiver Enable/Disable Timing

Rev. PrK | Page 9 of 15

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