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參數資料
| 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： | 6/17頁 |
| 文件大?。?/td> | 237K |
| 代理商： | LMX2525LQ1321/NOPB |
Programming Description (Continued)
PULSE SWALLOW FUNCTION
f
VCO = {8 x RF_B + RF_A + (RF_FN / FD)} x fOSC / R where (RF_A < RF_B) for PDC1500
f
VCO = {4 x RF_B + RF_A + (RF_FN / FD)} x fOSC / R where (RF_A < RF_B) for PDC800
f
VCO: Output frequency of voltage controlled oscillator (VCO)
RF_B: Preset divide ratio of binary 4-bit programmable counter (2
≤ RF_B≤ 15)
RF_A: Preset divide ratio of binary 3-bit swallow counter (0
≤ RF_A ≤ 7 for PDC1500 and 0 ≤ RF_A ≤ 3 for PDC800)
RF_FN: Preset numerator of binary 10-bit modulus counter (0
≤ RF_FN < FD)
FD: Preset denominator for modulus counter (FD = f
OSCCH) where fCH is the channel spacing)
f
OSC: Reference oscillator frequency
R: Internal reference oscillator frequency divider
OSC_FREQ [1:0]
Reference Oscillator Frequency (MHz)
R Divider
00
12.6
1
01
14.4
1
10
25.2
2
11
26.0
2
The value of the denominator (FD) is depended on the channel spacing and reference oscillator frequency. Table 6 summarizes
the denominator values based on the settings of the Rx/Tx, BS, and OSC_FREQ [1:0] bits.
TABLE 6. Demonimator Values
Rx/Tx
BS
OSC_FREQ [1:0]
Reference Oscillator Frequency (MHz)
R
f
CH (kHz)
Denominator(FD)
0
00
12.6
1
25.0
504
0
01
14.4
1
25.0
576
0
10
25.2
2
25.0
504
0
11
26.0
2
25.0
520
0
1
12.6
1
25.0
504
0
1
01
14.4
1
25.0
576
0
1
10
25.2
2
25.0
504
0
1
11
26.0
2
25.0
520
1
0
00
12.6
1
20.0
630
1
0
01
14.4
1
20.0
720
1
0
10
25.2
2
20.0
630
1
0
11
26.0
2
20.0
650
1
00
12.6
1
22.22
567
1
01
14.4
1
22.22
648
1
10
25.2
2
22.22
567
1
11
26.0
2
22.22
585
LMX2525
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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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