ADM2485(RevPrk) Просмотр технического описания (PDF) - Analog Devices

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ADM2485
(Rev.:RevPrk)

High Speed Isolated RS-485 Transceiver with Integrated Transformer Driver

Analog Devices 

ADM2485

TEST CIRCUITS

VOD

R

R

VOC

Figure 3. Driver Voltage Measurement

375Ω

VOD3 60Ω

VTST

375Ω

Figure 4. Driver Voltage Measurement

DDE OUT

RTS

150Ω

TxD

RxD

RE

VDD1

GND1

VDD2

195Ω

A

B

110Ω

VDD2 GND2

195Ω

GND2

Figure 5. Supply-Current Measurement Test Circuit

RTS

DDEE OUT

TxD

VCM(HF)

RxD

2.2kΩ

GND2

RECEIVE

ENABLE

VDD1

GND1 VDD2

VDD2

195Ω

B

A

110Ω 470nF

195Ω

GND2

GND2

50Ω

FTEST,

110nF VHF

50Ω

22kΩ

VTEST2

100nF

100nF

Figure 6. High Frequency Common-Mode Noise Test Circuit

Preliminary Technical Data

A

CL1

RLDIFF

B

CL2

Figure 7. Driver Propagation Delay

RTS

TxD

RxD

RE

VDD1

GND1

DE 150Ω

DE OUT 50pF

A

B

VDD2 GND2

Figure 8. RTS to DE OUT Propagation Delay

VCC

A

110Ω

TxD

S1

S2

B

50pF VOUT

RTS

Figure 9. Driver Enable/Disable

A

B RE

VOUT

CL

Figure 10. Receiver Propagation Delay

+1.5V

S1

–1.5V

RL

RE

CL

VOUT

VCC

S2

RE IN

Figure 11. Receiver Enable/Disable

Rev. PrK | Page 8 of 15

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