ADM3483 Просмотр технического описания (PDF) - Analog Devices

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ADM3483

3.3 V Slew Rate Limited, Half- and Full-Duplex, RS-485/RS-422 Transceivers

Analog Devices 

Data Sheet

TEST CIRCUITS

ADM3483/ADM3485/ADM3488/ADM3490/ADM3491

A/Y

VOD

B/Z

RL/2

RL/2 VOC

Figure 17. Differential Output Voltage

and Common-Mode Voltage Drivers

D

VCC

375Ω

VOD

RL

VCM =

–7V TO +12V

375Ω

Figure 18. Differential Output Voltage Drivers

with Varying Common-Mode Voltage

VID

R

0

VOL

IOL VOH

IOH

(+)

(–)

Figure 19. CMOS Output Voltage High and

CMOS Output Voltage Low Receivers

GENERATOR1

D

50Ω

VCC

CL

RL =

60Ω

OUT

CL = 15pF2

1PPR = 250kHz, 50% DUTY CYCLE, tR ≤ 6.0ns, ZO = 50Ω.

2CL INCLUDES PROBE AND STRAY CAPACITANCE.

Figure 20. Driver Differential Output Delay and Transition Times

VOM

S1

D

GENERATOR1

50Ω

VCC

RL = 27Ω

OUT

CL = 15pF2

VOH + VOL

VOM =

2

≈ 1.5V

1PPR = 250kHz, 50% DUTY CYCLE, tR ≤ 6.0ns, ZO = 50Ω.

2CL INCLUDES PROBE AND STRAY CAPACITANCE.

Figure 21. Driver Propagation Delays

0V OR 3V

S1

D

CL = 50pF2

OUT

RL = 110Ω

GENERATOR1

50Ω

VOH + VOL

VOM =

2

≈ 1.5V

1PPR = 250kHz, 50% DUTY CYCLE, tR ≤ 6.0ns, ZO = 50Ω.

2CL INCLUDES PROBE AND STRAY CAPACITANCE.

Figure 22. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)

Rev. E | Page 11 of 20

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