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參數(shù)資料
| 型號(hào)： | LMX2515LQ1321/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 26 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數(shù)： | 5/17頁 |
| 文件大小： | 254K |
| 代理商： | LMX2515LQ1321/NOPB |
Programming Description (Continued)
R0 REGISTER
The R0 register address bits (R0 [1:0]) are “00”.
The Rx/Tx bit selects between receive and transmit modes and, in conjunction with the RF VCO selection bit (RF_SEL), the
channel spacing to be synthesized.
The RF_PD bit selects the power down mode of the RF PLL and selected VCO.
The HS bit selects between normal and high speed locking mode.
The RF_SEL bit is set to "0" for the LMX2515LQ0701 and "1" for the LMX2515LQ1321.
The RF N counter consists of the 4-bit programmable counter (RF_B counter), the 3-bit swallow counter (RF_A counter) and the
10-bit delta sigma modulator (RF_FN counter). The equations for calculating the counter values are presented below.
R0 REGISTER
Register
MSB
SHIFT REGISTER BIT LOCATION
LSB
23
22
21
20
19
18
17
16
15
14
13
12
11
10
987654321
0
Data Field
Address
Field
R0
(Default)
RX/
TX
RF_
PD
HS
0
RF_
SEL
RF_B
[3:0]
RF_A
[2:0]
RF_FN
[9:0]
00
Name
Functions
RX/TX
RX/TX Mode
0=Rx
1= Tx
RF_PD
Power Down of RF Synthesizer
0 = RF synthesizer on (Active mode)
1 = RF synthesizer powered down
HS
Locking Mode
0 = Normal Mode
1 = High Speed Mode
RF_SEL
RF VCO Selection
0 = LMX2515LQ0701
1 = LMX2515LQ1321
RF_B [3:0]
RF_B Counter
4-bit programmable counter
0
≤ RF_B ≤ 15 for both bands
RF_A [2:0]
RF_A Counter
3-bit swallow counter
0
≤ RF_A ≤ 7 for LMX2515LQ1321
0
≤ RF_A ≤ 3 for LMX2515LQ0701
RF_FN [9:0]
RF_FN Counter
10-bit modulus counter
0
Counter Name
Symbol
Functions
Modulus Counter
RF_FN
RF N Divider
N=8x RF_B + RF_A + RF_FN/FD (LMX2515LQ1321)
N=4x RF_B + RF_A + RF_FN/FD (LMX2515LQ0701)
Programmable Counter
RF_B
Swallow Counter
RF_A
LMX2515
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LMX2515LQX0701 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer System with Integrated VCO |
| LMX2515LQX0701/NOPB | 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Single 28-Pin LLP EP T/R |
| LMX2515LQX1321 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer System with Integrated VCO |
| LMX2522 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Frequency Synthesizer System with Integrated VCOs |
| LMX25221635EVAL | 制造商:OC White Company 功能描述:Evaluation Board For LMX2522 PLLatinum Frequency Synthesizer System |
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