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HCPL-4200 Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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HCPL-4200 Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
11 / 13 page 11 Figure 17. Simplex Current Loop System Configurations for (a) Point-to-Point, (b) Multidrop. A recommended non-isolated active transmitter circuit which can be used with the HCPL-4200 in point-to-point or in multidrop 20 mA current loop applications is given in Figure 18. The current source is controlled via a stan- dard TTL 7407 buffer to provide high output impedance of current source in both the ON and OFF states. This non-isolated active transmitter pro- vides a nominal 20 mA loop current for the listed values of V CC , R2 and R3 in Figure 18. Length of current loop (one direction) versus minimum required DC supply voltage, V CC , of the circuit in Figure 18 is graphically illustrated in Figure 19. Multidrop configu- rations will require larger V CC than Figure 19 predicts in order to account for additional station terminal voltage drops. Typical data rate performance versus distance is illus- trated in Figure 20 for the combination of a non-isolated active transmitter and HCPL-4200 optically coupled cur- rent loop receiver shown in Figure 18. Curves are shown for 10% and 25% distortion data rate. 10% (25%) distor- tion data rate is defined as that rate at which 10% (25%) distortion occurs to output bit interval with respect to input bit interval. An input Non-Return-to-Zero (NRZ) test waveform of 16 bits (0000001011111101) was used for data rate distortion measurements. Data rate is inde- pendent of current source supply voltage, V CC . The cable used contained five pairs of unshielded, twist- ed, 22 AWG wire (Dearborn #862205). Loop current is 20 mA nominal. Input and output logic supply voltages are 5 V dc. |
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