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參數(shù)資料
| 型號： | LMX2515LQX0701/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 26 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 231K |
| 代理商： | LMX2515LQX0701/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 LMX2515LQ1321
f
VCO = {4 x RF_B + RF_A + (RF_FN / FD)} x fOSC / R where (RF_A < RF_B) for LMX2515LQ0701
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 LMX2515LQ1321 and 0 ≤ RF_A ≤ 3 for
LMX2515LQ0701)
RF_FN: Preset numerator of binary 10-bit modulus counter (0
≤ RF_FN < FD)
FD: Preset denominator for modulus counter (FD = f
OSC/(RxfCH) 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, RF_SEL, and OSC_FREQ [1:0] bits.
TABLE 6. Demonimator Values
Part Number
RF_SEL
Rx/Tx
OSC_FREQ [1:0]
Reference Oscillator
Frequency (MHz)
Rf
CH (kHz)
Denominator
(FD)
LMX2515LQ0701
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
00
12.6
1
20.0
630
0
1
01
14.4
1
20.0
720
0
1
10
25.2
2
20.0
630
0
1
11
26.0
2
20.0
650
LMX2515LQ1321
1
0
00
12.6
1
25.0
504
1
0
01
14.4
1
25.0
576
1
0
10
25.2
2
25.0
504
1
0
11
26.0
2
25.0
520
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
LMX2515
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