ADM3485EARZ datasheet(7/16 Pages) AD

7 / 16 page

ADM3485E

Rev. D | Page 7 of 16

TEST CIRCUITS AND SWITCHING CHARACTERISTICS

VOC

RL/2

VOD

Figure 3. Driver Differential Output Voltage and

Common-Mode Output Voltage

375

Ω

375

Ω

VOD

VCM =

–7V TO +12V

VCC

Figure 4. Driver Differential Output Voltage with

Varying Common-Mode Voltage

VOH

IOH

(–)

VID

IOL

(+)

VOL

Figure 5. Receiver Output Voltage High and Output Voltage Low

OUT

+1.5V

+3V

≈ +2V

≈ –2V

tDD

tTD

50%

10%

90%

GENERATOR1

VCC

Ω

RL =

Ω

CL = 15pF2

OUT

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

2CL INCLUDES PROBE AND STRAY CAPACITANCE.

Figure 6. Driver Differential Output Delay and Transition Times

VOH

VOL

VOH

VOL

VOM

OUT

1.5V

tPLH

tPHL

tPLH

VOM

RL = 27Ω

OUT

CL = 15pF2

GENERATOR1

VCC

Ω

VOM =

VOH + VOL

≈ 1.5V

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

2CL INCLUDES PROBE AND STRAY CAPACITANCE.

Figure 7. Driver Propagation Delays

OUT

CL = 50pF2

GENERATOR1

Ω

VOM =

VOH + VOL

≈ 1.5V

RL = 110Ω

0V OR 3V

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

2CL INCLUDES PROBE AND STRAY CAPACITANCE.

VOH

1.5V

0.25V

OUT

VOM

tPZH

tPHZ

Figure 8. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)

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