Avago Technologies ACPL-224-500E - Manual (Page 30)

AV02-4387EN 27 Avago Technologies
Description
The above half-duplex, point-to-
point, multi-drop, 20 mA current
loop configuration can alternat ingly
transmit bi-directional data over
two wires. Only one current source is
required. Each isolated station with
an HCPL-4100 transmitter and HCPL-
4200 receiver optocouplers provides
excellent common-mode rejection.
Performance of Circuit
• 1 mA noise margin in the “space”
state
• 8 mA noise margin in the “mark”
state
• Typical signal rate and distance:
40 m at 100 kBd; over 200 m at 10
kBd
Benefits
• Maintains data integrity
• Simple data transmission system
for industrial applications
Isolated 20 mA Current Loop Interface
Data Communications Applications