HI-1570
TRANSMITTER
TXA/B
TXA/B
TXINHA/B
V
CONT
A&B
52.5
W
(.75 Zo)
35
W
(.5 Zo)
52.5
W
(.75 Zo)
1.4:1
BUSA/B
1:1.79
Point
“A
T
”
1:1.4
52.5
W
(.75 Zo)
35
W
(.5 Zo)
BUSA/B
Isolation
Transformer
Point
“A
T
”
1.79:1
Coupling
Transformer
52.5
W
(.75 Zo)
RECEIVER
RXA/B
RXA/B
Coupling
Transformer
Isolation
Transformer
RXENA/B
Figure 3. Transformer Coupled Test Circuits
7.5
Slope =
D
Vo ÷
D
V
CONT
A&B
FS
6.0
0.8FS
Output Amplitude
(Vo p-p @ point A
D
)
4.5
0.6FS
3.0
0.4FS
1.5
0.2FS
0
0
1.0
2.0
3.0
4.0
0
5.0
Control Voltage - V
CONT
A&B
Figure 4. Transmitter Output Amplitude (Vo)
vs V
CONT
A&B Voltage
HOLT INTEGRATED CIRCUITS
6