Aeroflex Circuit Technology

SCD4418 REV B 10/18/99 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

1MHz.

3. Specifications apply over the temperature range of -55°C to +125°C (Case Temperature) unless otherwise noted.

4. All typical values are measured at +25°C.

The information contained in this data sheet is believed to be accurate; however, Aeroflex Circuit Technology. assumes no

responsibility for its use, and no license or rights are granted by implication or otherwise in connection therewith.

Figure 3 – Transmitter (TX) Output Amplitude

Figure 4 – Transmitter (TX) Output offset

Figure 5 – Typical Transformer Connection

Figure 6 – Power Dissipation vs Duty Cycle

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

Center

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

(TYPICAL)

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