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LMX2371TMX bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LMX2371TMX
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nhà sản xuất  NSC [National Semiconductor (TI)]
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2.0 Programming Description (Continued)
Most Significant Bit
SHIFT REGISTER BIT LOCATION
Least Significant Bit
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
65432
1
0
Data Field
Address Field
Aux_N
Aux_B_CNTR[12:0]
Aux_A_CNTR[4:0]
01
2.3.2 Main_N Register
If the ADDRESS[1:0] field is set to 1 1, data is transferred from the 22-bit shift register into the Main_N register which sets the
Main PLL’s 18-bit N-counter, prescaler value and power-down bit. The 18-bit N-counter consists of a 5-bit swallow counter,
Main_A_CNTR[4:0], and a 13-bit programmable counter, Main_B_CNTR[12:0]. Serial data format is shown below.
Most Significant Bit
SHIFT REGISTER BIT LOCATION
Least Significant Bit
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
65432
1
0
Data Field
Address Field
Main_N
Main_B_CNTR[12:0]
Main_A_CNTR[4:0]
11
2.3.3 Feedback Divide Ratio (Main B Counter, Auxiliary B Counter)
Main_B_CNTR[12:0] or Aux_B_CNTR[12:0]
Divide Ratio
N17
N16
N15
N14
N13
N12
N11
N10
N9
N8
N7
N6
N5
3
00000000
00011
4
00000000
00101
••••••••
•••••
8,191
11111111
11111
Note: B-counter divide ratio must be
≥ 3.
2.3.4 Swallow Counter Divide Ratio (Main A Counter, Auxiliary A Counter)
Main_A_CNTR[4:0] or Aux_A_CNTR[4:0]
Divide Ratio
Main_N4
Main_N3
Main_N2
Main_N1
Main_N0
0
00000
1
00001
•••••
31
11111
Notes: A < P,
B > A.
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