t
f
*
90%
LAST BIT
Magnified View
OUTPUT OFFSET
*
17V P-P MIN
24V P-P MAX
0 Volts
0 Volts
OUTPUT OFFSET
*
10%
2.5 µsec
t
r
*
* Rise and fall times measured at point A-A’ in Fig 5
*Offset measured at point A-A’ in Fig 5
FIGURE 3 – TRANSMITTER (TX) OUTPUT
WAVEFORM
FIGURE 4 – TRANSMITTER (TX) OUTPUT
OFFSET
TX DATA OUT
35Ω N1:N2
POWER DISSIPATION
WATTS
A
170Ω
A’
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
10
20
30
40
50
60
70
80
90 100
(TYPICAL)
TX DATA OUT
RX DATA IN
RX DATA IN
35Ω
Transformer turns ratio:
N1:N2 = 1:1
Use Aeroflex 25T1553-1
DUTY CYCLE, PERCENT
FIGURE 5 – TYPICAL TRANSFORMER
CONNECTION
FIGURE 6 – POWER DISSIPATION VS.
DUTY CYCLE
SCD4435N Rev B
5