521 - 68 - 04

6

characteristic

impedance

of

the

cable.

Controlled

impedance traces should be used for the outputs and the

termination resistors should be placed near the GS9028.

The inductor (L) and resistor (R) are used to optimize the

output return loss and are PCB dependent. Typically, R

equals the transmission line characteristic impedance and

L is approximately 8.2nH.

OUTPUT AMPLITUDE ADJUSTMENT

The GS9028 outputs are adjustable from as low as 50mV to

resistor connected to pin 4. The relationship between the

the equation below:

note that the above formula assumes that the transmission

line is properly end terminated.

TYPICAL APPLICATION CIRCUIT

75

75

75

75

59

10n

8.2nH

1µ

1µ

1µ

100n

SDO

SDO

SDI

SDI

8.2nH

GS9028

4

3

2

1

5

6

7

8

All resistors in ohms, all capacitors in farads, unless otherwise shown.