Aeroflex Circuit Technology

SCD4418D Rev A 9/24/97 Plainview NY (516) 694-6700

5

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.

Figure 3 Transmitter (TX) Output Amplitude

Figure 4 Transmitter (TX) Output offset

Figure 5 Typical Transformer Connection

Figure 6 Typical Hybrid Power Dissipation

0

10

20

30

40

50

60

70

80

90 100

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

DUTY CYCLE, PERCENT

OUTPUT OFFSET

*

OUTPUT OFFSET

*

LAST BIT

2.5 µsec

*Offset measured at point A-A’ in Fig 5

N1:N2

A

A’

B’

B

TX DATA OUT

TX DATA OUT

RX DATA IN

RX DATA IN

70

Ω

70

Ω

52.5

Ω

52.5

Ω

Ctr

tap

Transformer turns ratios:

N1:N2 = 1:1

N1:N3 = 1:0.707

Use Aeroflex 25T1553-1

N1:N3 for

stub

coupling

0 Volts

Magnified View

vs Control Voltage

0

1

2

3

4

5

6

7

8

9

10

CONTROL VOLTAGE

12

15

27

30

24

21

18

9

6

3

0

Typical

Vdc

(Total hybrid with one channel transmitting

and the other not powered – 100% Duty Cycle)

Total Hybrid Input

Power

C2

C1

C1 & C2 are > 0.47µF,

BX Ceramic Capacitors.

vs Duty Cycle (Total with one channel

transmitting and the other not powered)

Ω

Typical Hybrid

Dissipation

3.25

1.65