GS9062-CFE3 datasheet(36/46 Pages) GENNUM

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GS9062 Data Sheet

22209 - 7

February 2007

36 of 46

3.8.3 Loop Bandwidth Adjustment

For new designs the GO1555 is recommended for use with the GS9062. The

recommended application ciruit can be seen in Section 4.1 Typical Application

Circuit.

Designs using the GO1525 VCO use different loop bandwidth components. The

application circuit is shown in Figure 3-4.

NOTE: When using the GS9062 with the GS4911B clock generator a narrower

loop bandwidth for the GS9062 serializer should be used. For more details please

refer to section 2.5 of the GS4911B Reference Design.

Figure 3-4: Typical Application Circuit using GO1525

3.9 Serial Digital Output

The GS9062 contains an integrated current mode differential serial digital cable

driver.

To enable this output, SDO_EN/DIS must be set HIGH by the application layer.

Setting the SDO_EN/DIS signal LOW will cause the SDO and SDO output pins to

become high impedance, resulting in reduced device power consumption.

With suitable external return loss matching circuitry, the GS9062's serial digital

outputs will provide a minimum output return loss of -15dB at 270Mb/s.

The integrated cable driver uses a separate power supply of +1.8V DC supplied via

the CD_VDD and CD_GND pins.

VCO_VCC

+1.8V_A

+3.3V

VCO_VCC

CP_VDD

PD_GND

PD_VDD

GO1525

GND

10n

100n

10n

2n2

10n

GND_A

GND_VCO

VCO_VCC

GS9062

Do not populate R2

GS9062-CFE3 Datasheet(PDF) 36 Page - Gennum Corporation

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