LTM2885 datasheet(13/32 Pages) AD

tên linh kiện	LTM2885

Giải thích chi tiết về linh kiện	Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination

PDF	32 Pages

Scroll/Zoom	100%

nhà sản xuất	AD [Analog Devices]

Trang chủ	http://www.analog.com

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13 / 32 page

LTC2873

REV B

For more information www.analog.com

Figure 5. RS485 Driver Enable and Disable Timing Measurements

Figure 6. RS485 Receiver Propagation Delay Measurements

Figure 7. RS485 Receiver Enable and Disable Timing Measurements

TEST CIRCUITS

Figure 8. RS485 Termination Resistance and Timing Measurements

2873 F05

tZLD485,

tZLSD485

tLZD485,

tLZSD485

tHZD485,

tHZSD485

tZHD485,

tZHSD485

½VCC

VOL

VCC

VOH

A/DO OR B/RI

B/RI OR A/DO

DRIVER

DE485/F232

OR SHDN

GND

A/DO

B/RI

GND

VCC

GND

½VL

DE485/F232

OR SHDN

0.5V

2873 F06

RECEIVER

VCM

±VAB/2

A/DO

B/RI

±VAB/2

tPLHR485

tSKEWR485 = tPLHR485 – tPHLR485

tRR485

90%

½VL

A/DO TO B/RI

10%

tPHLR485

tFR485

90%

–VAB

VAB

½VL

10%

2873 F08

RECEIVER

VAB

A/DO

B/RI

VAB

RTERM =

½VL

TE485

90%

10%

tRTZ485

tRTEN485

TE485

+–

2873 F07

tZLR485,

tZLRSR485

tLZR485,

tLZSR485

tHZR485,

tHZSR485

tZHR485,

tZHRSR485

½VL

VOL

VOH

RE485

OR SHDN

RECEIVER

RE485

OR SHDN

0V TO 3V

3V TO 0V

A/DO

B/RI

GND

½VL

0.5V

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