參數(shù)資料
型號(hào)： LMX2502LQ1635
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(yè)數(shù)： 8/18頁(yè)
文件大?。?/td> 184K
代理商： LMX2502LQ1635
Functional Description
(Continued)
TABLE 2. Power Down Configuration
CE Pin
0
1
1
1
1
RF_EN
X
0
0
1
1
IF_EN
X
0
1
0
1
RF Circuitry
OFF
OFF
OFF
ON
ON
IF Circuitry
OFF
OFF
ON
OFF
ON
X = Don’t care.
LOCK DETECT
The LD output can be used to indicate the lock status of the
RF PLL. Bit 21 in Register R0 determines the signal that
appears on the LD pin. When the RF PLL is not locked, the
LD pin remains LOW. After obtaining phase lock, the LD pin
will have a logical HIGH level. The output can also be
programmed to be ground at all times.
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 9:
LD output becomes LOW when the phase error is larger than t
W2
.
Note 10:
LD output becomes HIGH when the phase error is less than t
W1
for
four or more consecutive cycles.
Note 11:
Phase Error is measured on leading edge. Only errors greater than
t
W1
and t
W2
are labeled.
Note 12:
t
W1
and t
W2
are equal to 10 ns.
Note 13:
The lock detect comparison occurs with every 64
th
cycle of f
R
and
f
N
.
20068005
FIGURE 1. Lock Detect Timing Diagram Waveform
(Notes 9, 10, 11, 12, 13)
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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:
LMX2502LQX1635 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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LMX25051321EVAL/NOPB 功能描述:EVALUATION BOARD FOR LMX25051321 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
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