17V P-P MIN
24V P-P MAX
90%
tf*
0 Volts
10%
tr*
* Rise and fall times measured at point A-A’ in Fig 5
FIGURE 3 – TRANSMITTER (TX) OUTPUT
WAVEFORM
0 Volts
LAST BIT
2.5 µsec
Magnified View
OUTPUT OFFSET*
OUTPUT OFFSET*
*Offset measured at point A-A’ in Fig 5
FIGURE 4 – TRANSMITTER (TX) OUTPUT
OFFSET
TX DATA OUT
TX DATA OUT
RX DATA IN
RX DATA IN
35Ω N1:N2
A
A’
35Ω
170Ω
Transformer turns ratio:
N1:N2 = 1:1
Use Aeroflex 25T1553-1
FIGURE 5 – TYPICAL TRANSFORMER
CONNECTION
4.0
3.5
3.0
2.5
(TYPICAL)
2.0
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE, PERCENT
FIGURE 6 – POWER DISSIPATION VS.
DUTY CYCLE
SCD4435N Rev B
5