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參數(shù)資料
| 型號(hào)： | LMX2502 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum⑩ Frequency Synthesizer System with Integrated VCO |
| 中文描述： | PLLatinum⑩頻率合成系統(tǒng)的集成VCO |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 184K |
| 代理商： | LMX2502 |
Programming Description
(Continued)
R0 REGISTER
The R0 register address bits (R0 [1:0]) are “00”.
The SPI_DEF bit selects between using the default IF counter values and user programmable values. The use of the default
counter values requires that only words R0 to R3 (registers R3, loaded first, to R0, loaded last) be sent after initial power up.
The RF_LD bit activates the lock detect output of the LD pin (pin 19). The lock detect mode shows the lock status of the RF PLL.
The waveform of the lock detect mode is shown in
Figure 1
, in the
Functional Description
section on
LOCK DETECT
.
The RF N counter consists of the 4-bit programmable counter (RF_B counter), the 3-bit swallow counter (RF_A counter) and the
11-bit delta sigma modulator (RF_FN counter). The equations for calculating the counter values are presented below.
R0 REGISTER
R
MSB
23
SHIFT REGISTER BIT LOCATION
16
15
14
13
Data Field
LSB
0
22
21
20
19
18
17
12
11
10
9
8
7
6
5
4
3
2
1
Address
Field
0
0
R0
(Default)
SPI_
DEF
RF_
SEL
RF_
LD
0
RF_B
[3:0]
RF_A
[2:0]
RF_FN
[10:0]
Name
SPI_DEF
Functions
Default Register Selection
0 = OFF (Use values set in R0 to R6)
1 = ON (Use default values set in R0 to R3)
RF VCO Selection
0 = LMX2512
1 = LMX2502
RF Lock Detect
0 = Hard zero (GND)
1 = Lock detect
RF_B Counter
4-bit programmable counter
2
≤
RF_B
≤
15
RF_A Counter
3-bit swallow counter
0
≤
RF_A
≤
7 for LMX2502
0
≤
RF_A
≤
5 for LMX2512
RF Fractional Numerator Counter
11-bit programmable counter
0
≤
RF_FN
<
1920 for f
OSC
= 19.20 MHz
0
≤
RF_FN
<
1968 for f
OSC
= 19.68 MHz
RF_SEL
RF_LD
RF_B [3:0]
RF_A [2:0]
RF_FN [10:0]
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX25021635EVAL | 制造商:OC White Company 功能描述:Evaluation Board For LMX2502 PLLatinum Frequency Synthesizer |
| LMX25021635EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LMX25021635 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| LMX2502LQ1635 | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| LMX2502LQ1635/NOPB | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| LMX2502LQ1635/S7001911 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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