MAX3480A Просмотр технического описания (PDF) - Maxim Integrated

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MAX3480A

Complete, Isolated, 3.3V RS-485/RS-422 Data Interface

Maxim Integrated 

Complete, Isolated, 3.3V

RS-485/RS-422 Data Interface

_________________________________________________________________Test Circuits

A

VOD

B

R

R

VOC

ISOLATION BARRIER

3.3V

DE´

A

DI´

D

VID

B

ISOLATION BARRIER

3.3V

CL1

A

R3

RDIFF

R

RO

B

CL2

Figure 3. Driver DC Test Load

Figure 4. Driver/Receiver Timing Test Circuit

OUTPUT

UNDER TEST

500Ω

CL

ISO VCC1,

S1

ISO VCC2

S2

Figure 5. Driver Timing Test Load

_______________________________________________________Switching Waveforms

VCC_ - 0.4V

´ VCC_ - 0.4V

DI

2

0V

B

A

VDIFF

VO

0V

-VO

VO

1/2 VO

10%

tR

VCC_ - 0.4V

2

tPLH

tPHL

1/2 VO

VDIFF = VA - VB

90%

90%

10%

tF

tSKEW = | tPLH - tPHL |

Figure 6. Driver Propagation Delays and Transition Times

VCC_ - 0.4V

DE´

VCC_ - 0.4V

2

0V

A, B

VOL

A, B

0V

VCC_ - 0.4V

2

tZL

tLZ

2.3V OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

2.3V

tZH

tHZ

VOL + 0.5V

VOH - 0.5V

Figure 7. Driver Enable and Disable Times

______________________________________________________________________________________ 11

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