STW81101AT datasheet(32/48 Pages) STMICROELECTRONICS

部品番号	STW81101AT

部品情報	Multi-band RF frequency synthesizer with integrated VCOs

PDF	48 Pages

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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32 / 48 page

I2C bus interface

STW81101

32/48

6.4

VCO calibration procedure

Calibration of the VCO center frequency is activated when the SERCAL bit (CALIBRATION

To program the device properly while ensuring VCO calibration, perform the following steps

before every channel change:

Program all the registers using a multi-byte write sequence with the desired settings

(functional mode, B and A counters, R counter, VCO amplitude, charge pump,

prescaler modulus), and all the bits of the CALIBRATION register (05H) set to 0.

Program the CALIBRATION register using a single-byte write sequence (subaddress

05H) with the SERCAL bit set to 1.

The maximum allowed PFD frequency (FPFD) during calibration is 1 MHz; if you want a

FPFD higher than 1 MHz, perform the following additional steps:

Perform all the steps of the calibration procedure, making sure to program the

desired VCO frequency with proper settings for the R, B and A counters so that

FPFD is ≤1 MHz.

Program the device with the desired VCO and PFD frequency settings according

to step 1) above.

STW81101AT データシート(PDF) 32 Page - STMicroelectronics