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參數(shù)資料
| 型號： | LMX2502LQX1635 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum⑩ Frequency Synthesizer System with Integrated VCO |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 184K |
| 代理商： | LMX2502LQX1635 |
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 |
|---|---|
| LMX2505 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinu Dual Frequency Synthesizer System with Integrated VCOs |
| LMX25051321EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LMX25051321 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 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 |
| LMX2505LQ1321 | 制造商:Texas Instruments 功能描述:PLL VCO CDMA SMD 2505 LLP-28 |
| LMX2505LQ1321/NOPB | 功能描述:IC FREQ SYNTH DUAL W/VCO 28LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:100 系列:* |
| LMX2505LQX1321 | 功能描述:IC SYNTHESIZER PLL VCO 28-LLP RoHS:是 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:100 系列:* |
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