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參數(shù)資料
| 型號： | LMX2515LQX0701 |
| 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, 26 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 251K |
| 代理商： | LMX2515LQX0701 |
Functional Description
(Continued)
TABLE 1. Power Down Modes
CE pin
HIGH
HIGH
LOW
LOW
RF_PD Bit
0
1
0
1
Mode
Active
Not Active
Not Active
Not Active
VCO SELECTION
The RF_SEL bit must be used to select the RF VCO output.
When using the LMX2515LQ0701 the RF_SEL bit must be
set to "0". When using the LMX2515LQ1321 the RF_SEL bit
must be set to "1".
TABLE 2. VCO Selection
RF_SEL Bit
0
1
Mode
LMX2515LQ0701
LMX2515LQ1321
LOCK DETECT MODE
The LD output can be used to indicate the lock status of the
PLL. Bit 6 in Register R1 determines the signal that appears
on the LD pin. When the PLL is not locked, the LD pin
remains LOW. After obtaining phase lock, the LD pin will
have a logical HIGH level. The LD output is always low when
the LD register bit is 0 and in power down mode.
TABLE 3. Lock Detect Modes
LD Bit
0
1
Mode
Disable (GND)
Enable
TABLE 4. Lock Detect Logic
RF-PLL Section
Locked
Not Locked
LD Output
HIGH
LOW
Note 13:
LD output becomes low when the phase error is larger than t
W2
.
Note 14:
LD output becomes high when the phase error is less than t
W1
for
four or more consecutive cycles.
Note 15:
Phase Error is measured on leading edge. Only errors greater than
t
W1
and t
W2
are labeled.
Note 16:
t
is 5 ns for LMX2515LQ1321 and 10 ns for LMX2515LQ0701.
t
W2
is 10 ns for both devices.
Note 17:
The lock detect comparison occurs with every 64
th
cycle of f
R
and
f
N
20068808
FIGURE 2. Lock Detect Timing Diagram Waveform
(Notes 13, 14, 15, 16, 17)
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LMX25221635EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LMX2522XXXX RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:PLLatinum™ 標準包裝: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 |
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