STW81100AT-1 STMicroelectronics, STW81100AT-1 Datasheet - Page 20

• Manufacturer Part Number: STW81100AT-1
• Description: IC SYNTHESIZER MULTI RF 28VFQFPN
• Manufacturer: STMicroelectronics
• Type: Frequency Synthesizerr

Specifications of STW81100AT-1

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 3:2
• Differential - Input:output: No/No
• Frequency - Max: 4.4GHz
• 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: 4.4GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STW81100
Table 20. A_COUNTER
Bit B0 for B Counter, A Counter value and bit R8 for Reference divider.
Table 21. REF_DIVIDER
Reference Clock divider ratio R[7:0] (bit R8 in the previous register).
The LO output frequency is programmed by setting the proper value for A,B and R according to the fol-
lowing formula:
Table 22. Calibration
This register controls VCO calibrator.
INITCAL: resets the auto-calibrator State Machine (writing to “1” and back to “0”)
SERCAL: at “1” starts the VCO auto-calibration (should be reset to “0” at the end of calibration)
SELEXTCAL: test purpose only; must be set to '0'
CAL[4:0]: test purpose only; must be set to '0'
Table 23. CONTROL
The CONTROL register is used to set the VCO output voltage amplitude and the Charge Pump Current.
PLL_A[1:0]: VCO amplitude
CPSEL[2:0]: Charge Pump output current
20/29
where D
INIT CAL
PLL_A0
MSB
MSB
MSB
MSB
R7
b7
b7
b7
B0
b7
R
equals
SER CAL
PLL_A1
b6
b6
R6
b6
A5
b6
{
1
0.5
0.25
SEL EXT CAL
CP SEL 0
for Direct Output
for Output Divided by 2
for Output Divided by 4
A4
R5
b5
b5
b5
b5
F
OUT
=
D
CP SEL 1
R
A3
R4
CAL 0
b4
b4
b4
b4
⋅
(
B 64
⋅
+
CP SEL 2
A
CAL 1
R3
A2
b3
b3
)
b3
b3
⋅
F
--------------------------
REF_CLK
R
CAL 2
R2
A1
b2
b2
NA
b2
b2
CAL 3
R1
A0
b1
b1
NA
b1
b1
CAL 4
LSB
LSB
LSB
LSB
R8
R0
NA
b0
b0
b0
b0