Figure 3 Transmitter (TX) Output Amplitude
vs Control Voltage
V
P
-
P
@ B–B'
30
27
OUTPUT AMPLITUDE
24
21
18
15
12
9
6
3
0
0
1
2
3
4
5
6
7
8
9
10
CONTROL VOLTAGE
Slope = 3V
P
-
P
/Vdc
Typical
0 Volts
Figure 4 Transmitter (TX) Output offset
LAST BIT
Magnified View
OUTPUT OFFSET
*
OUTPUT OFFSET
*
2.5 µsec
*Offset measured at point A-A’ in Fig 5
Vdc
Figure 5 Typical Transformer Connection
(Total hybrid with one channel transmitting
and the other not powered – 100% Duty Cycle)
70Ω
70Ω
Figure 6 Typical Hybrid Power Dissipation
vs Duty Cycle (Total with one channel
transmitting and the other not powered)
POWER DISSIPATION
WATTS
4.0
3.5
3.0
2.5
2.0
1.5
1.0
Typical Hybrid
Dissipation
10
20
30
40
50
60
70
80
90 100
1.65
Total Hybrid Input
Power
3.25
TX DATA OUT
C1 N1:N2
B
52.5Ω
A
Ctr
tap
N1:N3 for
stub
coupling
A’
52.5Ω
C2
TX DATA OUT
RX DATA IN
RX DATA IN
B’
0.5
0
0
C1 & C2 are > 0.47µF,
BX Ceramic Capacitors.
Transformer turns ratios:
N1:N2 = 1:1
N1:N3 = 1:0.707
Use Aeroflex 25T1553-1
DUTY CYCLE, PERCENT
For V
OP
-
P
= 30 V at 140Ω
NOTES
1. Characteristics guaranteed by design, not production tested.
2. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3K
Ω
minimum at 1 MHz.
3. Specifications apply over the temperature range of -40°C to +85°C (Case Temperature) unless otherwise
noted.
4. All typical values are measured at +25°C.
Aeroflex Circuit Technology
5
SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
