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STW81200 датащи(PDF) 37 Page - STMicroelectronics

номер детали STW81200
подробное описание детали  Wideband RF PLL fractional/integer frequency synthesizer with integrated VCOs and LDOs
PDF  58 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW81200 датащи(HTML) 37 Page - STMicroelectronics

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DocID025943 Rev 7
37/58
STW81200
Circuit description
57
ST2 Register
Address:
STW81200BaseAddress + 0x02
Type:
R/W
Applicability:
Double buffered (based upon DBR bit setting)
Description:
MOD value, RF2 output control
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
876543
21
0
RW
RW
RW
RW
RW
[26]
DBR: Double buffering bit enable; at ‘1’ the register is buffered and transferred only once the master
register ST0 is written
[25]
RESERVED: must be set to ‘0’
[24]
RF2_OUT_PD: RF2 output power down
0 = RF2 output enabled
1 = RF2 output disabled
[23:21]
RF2_DIV_SEL: RF2 output divider selection
000: (0) VCO direct
001: (1) VCO divided by 2
010: (2) VCO divided by 4
011: (3) VCO divided by 8
100: (4) VCO divided by 16
101: (5) VCO divided by 32
110: (6) VCO divided by 64
111: (7) same divided output of RF1 (not valid if RF1_DIV_SEL=0)
[20:0]
MOD: Modulus value bit; set the denominator value of the fractional part of the overall division ratio
(N=NINT+FRAC/MOD)
Range: 2 to 2097151



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