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參數(shù)資料
| 型號： | LMX2525LQ1321/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 26 MHz, QCC24 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, LLP-24 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 237K |
| 代理商： | LMX2525LQ1321/NOPB |
Programming Description (Continued)
R1 REGISTER
The R1 register address bits (R1 [1:0]) are “01”.
The SPI_DEF bit allows for the programming of words R3 to R5. Under most circumstances, the SPI_DEF bit should be set to
1.
The LD bit sets the function of the lock detect pin. Enabling the lock detect function provides a digital lock detect output of the
active RF synthesizer at the LD pin.
The OB_CRL [1:0] bits determine the power level of the RF output buffer. The power level can be adjusted to best meet the
system requirement. Refer to the Electrical Characteristics section for power output specifications.
The reference frequency selection bits, OSC_FREQ [1:0], are used to set the reference clock and R divider for use with one of
the following reference frequencies: 12.6 MHz, 14.4 MHz, 25.2 MHz or 26.0 MHz. The LMX2525 uses the OSC_FREQ bits along
with the BS and RX/TX bits to determine the correct divide ratios needed to meet the required channel spacing for the mode of
operation selected. Refer to Table 6 for a summary of denominator values.
R1 REGISTER
Register
MSB
SHIFT REGISTER BIT LOCATION
LSB
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9876
5
4
3
2
1
0
Data Field
Address
Field
R1
(Default)
SPI_
DEF
001001010000
0
010LDOB_
CRL
[1:0]
OSC_
FREQ
[1:0]
01
Name
Functions
SPI_DEF
Default Register Selection
0 = OFF (Use values set in R0 to R5)
1 = ON (Use default values set in R0 to R2)
LD
Lock Detect
0 = Disable (GND)
1 = Enable
OB_CRL [1:0]
Output Buffer Control
00 = Minimum Output Power
01 =
10 =
11 = Maximum Output Power
OSC_FREQ [1:0]
Reference Frequency Selection
00 = 12.6 MHz
01 = 14.4 MHz
10 = 25.2 MHz
11 = 26.0 MHz
LMX2525
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2525LQX1321 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Dual Frequency Synthesizer System with Integrated VCOs |
| LMX2525LQX1321/NOPB | 功能描述:IC FREQ SYNTH DUAL VCO 24-LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標準包裝:100 系列:* |
| LMX2531 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO |
| LMX2531_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO |
| LMX25311146EVAL | 功能描述:時鐘和定時器開發(fā)工具 LMX2531LQ1146 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
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