Aeroflex Circuit Technology

SCD4808 REV A 3/9/98

Plainview NY (516) 694-6700

5

NOTES

1. Characteristics guaranteed by design, not production tested.

2. Measured from 75kHz to 1MHz at point A-A’ with transformer self impedance of 3K

Ω minimum, power on or off

Figure 3 Transmitter (TX) Output Wave form

Figure 4 Transmitter (TX) Output offset

Figure 5 Typical Transformer connection

6.5V P-P MIN

8.5V P-P MAX

90%

10%

* Rise and fall times measured at point A-A’ in Fig 5

0 Volts

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 = 1:0.71

Use Aeroflex 25T1553-1

N1:N3 for

stub

coupling

0 Volts

Magnified View

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

(TYPICAL)

(Per Channel)

Configurations and Ordering Information

Model No.

DESC No.

Receiver Data level

Case

ARX4808

TBA

Normally High

Plug In

ARX4808-2

TBA

Normally High

Flat Pack

ARX4868

TBA

Normally Low

Plug In

ARX4868-2

TBA

Normally Low

Flat Pack