HMC1197LP7FE datasheet(21/57 Pages) AD

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

w/ Fractional-n Pll & Vco, 100 - 4000 MHz

3. VCO Divide Ratio and Gain Register

•

Reg 16h[5:0] is required to change the VCO Output Divider value if needed.

•

Reg 16h[10:6] is required to change the Output Gain if needed.

4. The fractional register, Reg 04h. The fractional register write triggers AutoCal if Reg 0Ah[11]=0, and

is loaded into the Delta Sigma modulator automatically after AutoCal runs. If AutoCal is disabled, Reg

0Ah[11]=1, the fractional frequency change is loaded into the Delta Sigma modulator immediately

when the register is written with no adjustment to the VCO.

Small steps in frequency in fractional mode, with AutoCal enabled (Reg 0Ah[11]=0), usually only require a

single write to the fractional register. Worst case, 3 Main Serial Port transfers to the HMC1197LP7FE could

be required to change frequencies in fractional mode. If the frequency step is small and the integer part of

the frequency does not change, then the integer register is not changed. In all cases, in fractional mode, it

is necessary to write to the fractional register Reg 04h for frequency changes.

1.2.3

registers required for Frequency changes in integer Mode

A change of frequency, in integer mode (Reg 06h[11]=0), requires Main Serial Port writes to:

1. VCO register

•

Reg 15h only required for manual control of VCO if Reg 0Ah[11]=1 (AutoCal disabled)

•

Reg 16h is required to change the VCO Output Divider value if needed

2. The integer register Reg 03h.

•

In integer mode, an integer register write triggers AutoCal if Reg 0Ah[11]=0, and is loaded into

the prescaler automatically after AutoCal runs. If AutoCal is disabled, Reg 0Ah[11]=1, the integer

frequency change is loaded into the prescaler immediately when written with no adjustment

to the VCO. Normally changes to the integer register cause large steps in the VCO frequency,

hence the VCO switch settings must be adjusted. AutoCal enabled is the recommended method

for integer mode frequency changes. If AutoCal is disabled (Reg 0Ah[11]=1), a prior knowledge of

the correct VCO switch setting and the corresponding adjustment to the VCO is required before

executing the integer frequency change.

1.2.4

Vco output Mute Function

The HMC1197LP7FE features an intelligent output mute function with the capability to disable the VCO

output while maintaining the PLL and VCO subsystems fully functional. The mute function is automatically

controlled by the HMC1197LP7FE, and provides a number of mute control options including:

Always mute (Reg 16h[5:0] = 0d). This mode is used for manual mute control.

Automatically mute the outputs during VCO calibration (Reg 17h[7] = 1) that occurs during output

frequency changes.

This mode can be useful in eliminating any out of band emissions during freqeuncy changes, and ensuring

that the system emits only desired frequencies. It is enabled by writing Reg 17h[7] = 1. Typical isolation

when the HMC1197LP7FE is muted is always better than 60 dB, and is ~ 30 dB better than disabling the

output buffers of the HMC1197LP7FE via Reg 17h[5:4].

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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