HMC832LP6GETR datasheet(18/49 Pages) AD

18 / 49 page

Data Sheet

HMC832

Figure 40. 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 need to be concerned about which switch setting is

used for a given frequency because this is handled by the

autocalibration 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 stays locked

and performs well over its full temperature range without

additional calibration, regardless of the temperature at which

the VCO was calibrated.

Autocalibration can also be disabled, thereby allowing manual

VCO tuning. Refer to the Manual VCO Calibration for Fast

Frequency Hopping section for a description of manual tuning.

Figure 41. Simplified Step Tuned VCO

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1330

1520

1900

2090

3040

2850

2660

2470

2280

1710

VCO FREQUENCY (MHz)

CALIBRATED AT +85°C, MEASURED AT +85°C

CALIBRATED AT +85°C, MEASURED AT –40°C

CALIBRATED AT –40°C, MEASURED AT –40°C

CALIBRATED AT –40°C, MEASURED AT +85°C

CALIBRATED AT +27°C, MEASURED AT +27°C

fMIN

fMAX

HOST

SCK

SYNTHESIZER

SDI

VCO

RFOUT

VCO

SUB-BAND

SELECT

VCO

VSPI

LOOP

FILTER

VCOIP

VTUNE

DTUNE

VSCK

VSDO

VSLE

SEN

Rev. A | Page 17 of 48

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