GS9028 查看數據表（PDF） - Unspecified

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GS9028

GENLINX ™II GS9028 Cable Driver with Two Adjustable Outputs

Unspecified 

The termination resistor (RT) value should be equal to the

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

as high as 1000mV. The output amplitude is set by the RSET

resistor connected to pin 4. The relationship between the

output amplitude (VOUT) and RSET is approximately given by

the equation below:

RSET = (1.3696 x ZO)/(2 x VOUT) - 5.5

where ZO is in ohms and VOUT is in volts.

The minimum value of RSET is 46Ω. For 75Ω cable and

800mV output amplitudes, the value of RSET is 59Ω. Also,

note that the above formula assumes that the transmission

line is properly end terminated.

TYPICAL APPLICATION CIRCUIT

5

VEE

6

SDI

4

RSET

59

3

VEE

7

GS9028

2

SDI

SDO

8

VCC

1

SDO

75

8.2nH 1µ

8.2nH 1µ

1µ

75

75 75

100n

VCC

10n

VCC

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

6

521 - 68 - 04

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