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參數(shù)資料
| 型號： | LMX2505LQ1321 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinu Dual Frequency Synthesizer System with Integrated VCOs |
| 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)： | 13/16頁 |
| 文件大?。?/td> | 231K |
| 代理商： | LMX2505LQ1321 |
Programming Description
(Continued)
PULSE SWALLOW FUNCTION
f
VCO
= {8 x RF_B + RF_A + (RF_FN / FD)} x f
OSC
/ R where (RF_A
<
RF_B) for PDC1500
f
VCO
= {4 x RF_B + RF_A + (RF_FN / FD)} x f
OSC
/ 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
OSC
/(R x f
CH
) where f
CH
is the channel spacing)
f
OSC
: Reference oscillator frequency
R: Internal reference oscillator frequency divider
OSC_FREQ [1:0]
00
01
10
11
Reference Oscillator Frequency (MHz)
12.6
14.4
25.2
26.0
R Divider
1
1
2
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
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
BS
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
OSC_FREQ [1:0]
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
Reference Oscillator Frequency (MHz)
12.6
14.4
25.2
26.0
12.6
14.4
25.2
26.0
12.6
14.4
25.2
26.0
12.6
14.4
25.2
26.0
R
1
1
2
2
1
1
2
2
1
1
2
2
1
1
2
2
f
CH
(kHz)
25.0
25.0
25.0
25.0
25.0
25.0
25.0
25.0
20.0
20.0
20.0
20.0
22.22
22.22
22.22
22.22
Denominator (FD)
504
576
504
520
504
576
504
520
630
720
630
650
567
648
567
585
L
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13
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參數(shù)描述 |
|---|---|
| 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:* |
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