9

ICS94201

Byte 16: Spread Sectrum Control Register

Byte 17: Spread Spectrum Control Register

Note: Please utilize software utility provided by ICS

Application Engineering to configure spread spectrum.

Incorrect spread percentage may cause system failure.

Note: Please utilize software utility provided by ICS

Application Engineering to configure spread spectrum.

Incorrect spread percentage may cause system failure.

Byte 18: Output Dividers Control Register

Byte 19: Output Dividers Control Register

Note: Changing bits in these registers results in frequency

divider ratio changes. Incorrect configuration of

group gear ratio can cause system malfunction.

Note: Changing bits in these registers results in frequency

divider ratio changes. Incorrect configuration of

group gear ratio can cause system malfunction.

Notes:

1. PWD = Power on Default

2. The power on default for byte 16-20 depends on the harware (latch inputs FS[0:4]) or IIC (Byte 0 bit [1:7]) setting. Be sure to read

back and re-write the values of these 5 registers when VCO frequency change is desired for the first pass.

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Note:

1. User needs to ensure step 3 & 7 is carried out. Systems with the wrong spread percentage and/or group to group divider ratio

programmed into bytes 16-20 could be unstable. Step 3 & 7 assure the correct spread and gear ratio.

2. If VCO, REF divider values or phase detector stability are out of range, the device may fail to function correctly.

3. Follow min and max VCO frequency range provided. Internal PLL could be unstable if VCO frequency is too fast or too slow.

Use 14.31818MHz x VCO/REF divider values to calculate the VCO frequency (MHz).

4. Users can also utilize software utility provided to program the VCO frequency from ICS Application Engineering.

5. Spread percent needs to be calculated based on VCO frequency, spread modulation frequency and spread amount desired.

See Application note for software support.