ICS1531 datasheet(70/76 Pages) ICST

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ICS1531 Rev N 12/1/99

December, 1999

Chapter 11

VCO Transfer Characteristics

ICS1531 Data Sheet - Preliminary

Chapter 11

VCO Transfer Characteristics

Figure 11-1 shows the VCO output frequency as a function of both Vin (that is, the VCO control voltage)

and VDD under the following conditions:

• Temperature is ‘ambient’.

• The Phase/Frequency Detector is disabled.

• The external filter is selected, and Vin is applied between the EXTFIL pin and XFILRET pin.

The VCO gain, shown as the slope of the linear region, is approximately 300 MHz/V. ICS recommends that

ideally, the ICS1531 is operated in a region from 250 to 500 MHz.

Important: If both the HSYNC and ADCSYNC signals are first measured at 0

° C and then the ADCSYNC

signal is measured at 70

° C, the drift (that is, the difference between the two ADCSYNC

measurements) is 400 ps.

Figure 11-1.

Relationship of VCO Voltage and VCO Output Frequency

100

200

300

400

500

600

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Vin (Volts)

VDD=3.0V

VDD=3.3V

VDD=3.6V

Linear Region

Ideal

Operating

Region

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