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STW81101ATR Datasheet(PDF) 21 Page - STMicroelectronics

Part # STW81101ATR
Description  Multi-band RF frequency synthesizer with integrated VCOs
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW81101ATR Datasheet(HTML) 21 Page - STMicroelectronics

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STW81101
Circuit description
21/48
Note:
The current is output on pin ICP. During VCO auto calibration, the ICP and VCTRL pins are
forced to VDD/2
Figure 18.
Loop filter connection
Table 7.
Current value vs. selection
CPSEL2
CPSEL1
CPSEL0
Current
Value for REXT=4.7 K
Ω
00
0
IMIN
0.5 mA
00
1
2*IMIN
1.0 mA
01
0
3*IMIN
1.5 mA
01
1
4*IMIN
2.0 mA
10
0
5*IMIN
2.5 mA
10
1
6*IMIN
3.0 mA
11
0
7*IMIN
3.5 mA
11
1
8*IMIN
4.0 mA
Charge
Pump
VDD
BUF
VCTRL
R3
C2
C1
Cal bit
BUF
C3
ICP
R1



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