STW81102ATR STMicroelectronics, STW81102ATR Datasheet - Page 35

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STW81102ATR

Manufacturer Part Number
STW81102ATR
Description
IC SYNTHESIZER MULTI RF 28VFQFPN
Manufacturer
STMicroelectronics
Type
Frequency Synthesizerr
Datasheet

Specifications of STW81102ATR

Pll
Yes
Input
Clock, Crystal
Output
Clock, Crystal
Number Of Circuits
1
Ratio - Input:output
3:2
Differential - Input:output
No/No
Frequency - Max
4.65GHz
Divider/multiplier
Yes/No
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-VFQFN, 28-VFQFPN
Frequency-max
4.65GHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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0
STW81102
6.4
6.4.1
VCO calibration procedure
Calibration of the VCO center frequency is activated when the SERCAL bit (CALIBRATION
register bit[6]) is set to 1.
To program the device properly while ensuring VCO calibration, perform the following steps
before every channel change:
1.
2.
The maximum allowed PFD frequency (F
higher than 1 MHz, perform the following additional steps:
VCO calibration auto-restart feature
The VCO calibration auto-restart feature can be enabled in two steps:
1.
2.
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.
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 F
Program the device with the desired VCO and PFD frequency settings according to
step 1) above.
set the desired frequency ensuring VCO calibration as described above (section 6.4)
program the FUNCTIONAL_MODE register (sub-address 00H) using a single-byte
write sequence with the CAL_AUTOSTART_EN bit set to '1' while keeping unchanged
the others.
PFD
) during calibration is 1 MHz; if you want a F
I
2
C bus interface
PFD
is ≤ 1 MHz.
35/53
PFD

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