ADM3483E Ver la hoja de datos (PDF) - Analog Devices

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Lista de partido

ADM3483E

3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers

Analog Devices 

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E

TEST CIRCUITS AND SWITCHING CHARACTERISTICS

Y

VOD

RL/2

RL/2 VOC

Z

Figure 7. Driver Differential Output Voltage and

Common-Mode Output Voltage

375Ω

D

VOD RL

VCM =

–7V TO +12V

VCC

375Ω

Figure 8. Driver Differential Output Voltage with

Varying Common-Mode Voltage

VID

R

0

VOL

IOL VOH

IOH

(+)

(–)

Figure 9. Receiver Output Voltage High and Output Voltage Low

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.

IN

Y

OUT

Z

OUT

3V

1.5V

1.5V

tPLH

VOM

tPHL

VOM

tPHL

VOM

tPLH

VOM

0V

VOH

VOL

VOH

VOL

Figure 11. Driver Propagation Delays

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.

+3V

IN

+1.5V

+1.5V

0V

tDD

tDD

OUT

50%

10%

90%

tTD

90%

50%

10%

tTD

≈ +2V

≈ –2V

Figure 10. Driver Differential Output Delay and Transition Times

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.

3V

IN

1.5V

1.5V

0V

tPZH

OUT

tPHZ

VOM

0.25V VOH

0V

Figure 12. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)

Rev. A | Page 9 of 20

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