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GFK-0825F Appendix C The Genius Serial Bus C-3
C
Genius Transceiver Electrical Specification
Property Min Max
Normal peak voltage Vp into 78 ohm terminated cable (1) 3.5 volts 5.5 volts
Normal peak voltage Vp into 150 ohm terminated cable (1) 6.0 volts 9.5 volts
Rated bus impedance (2) 78 ohms 150 ohms
Maximum output voltage (SER 1 and 2 open) (3) Peak
RMS
35 volts
15 volts
Maximum output current (SER 1 and 2 shorted together) Peak
RMS
180 milliamp
50 milliamp
Transmitter source resistance 80 ohms 140 ohms
Transmitter source inductance (transformer leakage inductance) 10 microhenries
Receiver input threshold; +Vr, -Vr (4) 0.7 volt 1.1 volt
Receive mode input impedance 10 K ohm
Receive mode load inductance (transformer shunt inductance) 6 millihenries 12 millihenries
Receiver common mode rejection (DC to 1 MHZ) 60 dB
Shield capacitor termination 0.1 microfarad
Isolation, serial bus to circuit, continuous 240 volts AC
Notes:
(1) Vp may vary among various module types.
(2) Rated load is half cable impedance when termination is included.
(3) Peak open circuit voltage contains underdamped ringing due to lack of termination.
(4) Input voltages between +Vr and -Vr thresholds are ignored.