HMC1197LP7FE datasheet(18/57 Pages) AD

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

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

Calibrated at 85C, Measured at 85C

Calibrated at 85C, Measured at -40C

Calibrated at -40C, Measured at -40C

Calibrated at -40C, Measured at 85C

Calibrated at 27C, Measured at 27C

1900 2100 2300 2500 2700 2900 3100 3300 3500 3700 3900 4100 4300

VCO FREQUENCY(MHz)

fmin

fmax

Figure 36. Typical VCO Tuning Voltage After Calibration

The calibration is normally run automatically once for every change of frequency. This ensures optimum

selection of VCO switch settings vs. time and temperature. The user does not normally have to be concerned

about which switch setting is used for a given frequency as this is handled by the AutoCal routine. The

accuracy required in the calibration affects the amount of time required to tune the VCO. The calibration

routine searches for the best step setting that locks the VCO at the current programmed frequency, and

ensures that the VCO will stay locked and perform well over it’s full temperature range without additional

calibration, regardless of the temperature that the VCO was calibrated at.

Auto-Calibration can also be disabled allowing manual VCO tuning. Refer to section 1.2.1.5 for a descrip-

tion of manual tuning.

1.2.1.2.2

auto-relock on lock detect Failure

It is possible by setting Reg 0Ah[17] to have the VCO subsystem automatically re-run the calibration

routine and re-lock itself if Lock Detect indicates an unlocked condition for any reason. With this option the

system will attempt to re-Lock only once.

1.2.1.3.3

Vco autocal on Frequency change

Assuming Reg 0Ah[11]=0, the VCO calibration starts automatically whenever a frequency change is

requested. If it is desired to rerun the AutoCal routine for any reason, at the same frequency, simply rewrite

the frequency change with the same value and the AutoCal routine will execute again without changing

final frequency.

1.2.1.4.4

Vco autocal time & accuracy

The VCO frequency is counted for Tmmt, the period of a single AutoCal measurement cycle.

mmt = Txtal · R · 2

(EQ 1)

is set by Reg 0Ah[2:0] and results in measurement periods which are multiples of the PD

period, TxtalR.

is the reference path division ratio currently in use, Reg 02h

Txtal

is the period of the external reference (crystal) oscillator.

The VCO AutoCal counter will, on average, expect to register N counts, rounded down (floor) to the nearest

integer, every PD cycle.

is the ratio of the target VCO frequency, fvco, to the frequency of the PD, fpd, where N can

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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.

Trademarks and registered trademarks are the property of their respective owners.

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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

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