Figure 3 – Transmitter (TX) Output Wave form
Figure 4 – Transmitter (TX) Output offset
LAST BIT
t
f
*
90%
Magnified View
OUTPUT OFFSET
*
*
6V P-P MIN
9V 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 Figure 5
Figure 5 – Typical direct transformer connection
70Ω
70Ω
*
Offset measured at point A-A' in Figure 5
Figure 6 – Power Dissipation vs. Duty Cycle
(Total hybrid with one channel transmitting
and the other not powered)
2000
1800
POWER DISSIPATION
MILLIWATTS
N1:N2
TX DATA OUT
P
B
52.5Ω
A
Center
Tap
N1:N3 for
Stub
Coupling
1600
1400
1200
1000
800
600
400
200
Maximum
Typical
TX DATA OUT
RX DATA IN
RX DATA IN
P'
B'
52.5Ω
A'
Transformer turns ratios:
N1:N2 = 1:2.5
N1:N3 = 1:1.77
Use Technitrol 1553-45 or equivalent
0
0
10
20
30
40
50
60
70
80
90 100
DUTY CYCLE – PERCENT
Note:Vcc=5 Volts,Transformer ratio 1:2.5, V
bus
(pt A-A') at 7.5 Volts P-P
Aeroflex Circuit Technology
5
SCD4455 REV A 1/29/98
Plainview NY (516) 694-6700
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
