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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LTM2882 데이터시트(PDF) 13 Page - Analog Devices |
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LTM2882 데이터시트(HTML) 13 Page - Analog Devices |
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13 / 32 page  LTC2873 13 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 ½VCC VL VOL VCC VOH 0V 0V A/DO OR B/RI B/RI OR A/DO DRIVER DI DE485/F232 OR SHDN VL OR GND A/DO RL B/RI GND OR VCC VCC OR GND RL CL CL ½VL ½VL DE485/F232 OR SHDN 0.5V 0.5V 2873 F06 RECEIVER VCM ±VAB/2 A/DO B/RI RO ±VAB/2 CL tPLHR485 tSKEWR485 = tPLHR485 – tPHLR485 tRR485 90% 0V ½VL A/DO TO B/RI RO 10% tPHLR485 tFR485 90% 0V –VAB VAB ½VL 10% VL 2873 F08 RECEIVER VAB A/DO B/RI VAB IA RTERM = VB ½VL ½VL TE485 IA IA 90% 10% tRTZ485 tRTEN485 0V VL TE485 +– +– 2873 F07 tZLR485, tZLRSR485 tLZR485, tLZSR485 tHZR485, tHZSR485 tZHR485, tZHRSR485 ½VL ½VL VL VOL VL VOH 0V 0V RE485 OR SHDN RO RO RECEIVER RO RE485 OR SHDN 0V TO 3V 3V TO 0V A/DO RL B/RI VL OR GND CL ½VL ½VL 0.5V 0.5V |
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