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SP481RCN

1/10th Unit Load RS-485 Transceiver

Signal Processing Technologies 

TEST CIRCUITS

A

R

VOD

B

R VOC

Figure 1. Driver DC Test Load Circuit

Receiver

Output

Test Point

1kΩ

S1

VCC

CRL

1kΩ

S2

Figure 2. Receiver Timing Test Load Circuit

CL1

DI

A RL

B

CL2

A

RO

B

15pF

Output

Under

Test CL

500Ω

S1

VCC

S2

Figure 3. Driver/Receiver Timing Test Circuit

Figure 4. Driver Timing Test Load #2 Circuit

SWITCHING WAVEFORMS

+3V

DI

0V

B

DRIVER

OUTPUT A

DIFFERENTIAL VO+

OUTPUT 0V

VA – VB VO–

f = 1MHz; tR < 10ns; tF < 10ns

1.5V

1.5V

VO 1/2VO

tPLH

tPHL

tDPLH

tDPHL

tR

tPLH

1/2VO

tF

tSKEW = | tDPLH - tDPHL |

Figure 5. Driver Propagation Delays

Date: 6/21/04

SP485R RS-485 Serial Transceiver

4

© Copyright 2004 Sipex Corporation

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