STW81102ATR STMicroelectronics, STW81102ATR Datasheet - Page 23

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

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

STW81102
5.8
5.8.1
5.8.2
Voltage controlled oscillators
VCO selection
The STW81102 integrates two low-noise VCOs to cover a wide band from:
●
●
●
The frequency range is 3000 MHz to 3620 MHz for VCO A and 4000 MHz to 4650 MHz for
VCO B.
VCO frequency calibration
Both VCOs can operate on 32 frequency ranges that are selected by adding or subtracting
capacitors from the resonator. These frequency ranges are intended to cover the wide band
of operation and compensate for process variation on the VCO center frequency.
The range is automatically selected when the SERCAL bit is set to 1. The charge pump is
inhibited, and the ICP and VCTRL pins are at VDD/2 volts. The ranges are then tested with
this VCO input voltage to select the one nearest to the desired output frequency (F
N*F
After this selection, the SERCAL bit is automatically reset to 0 and the charge pump is once
again enabled. To enable a fast settle, the PLL needs only to perform fine adjustment around
VDD/2 on the loop filter to reach F
Figure 19. VCO sub-bands frequency characteristics
ref
3000 MHz to 3620 MHz and 4000 MHz to 4650 MHz (direct output)
1500 MHz to 1810 MHz and 2000 MHz to 2325 MHz (selecting divider by 2)
750 MHz to 905 MHz and 1000 MHz to 1162.5 MHz (selecting divider by 4)
/R).
OUT
.
Circuit description
OUT
=
23/53