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參數(shù)資料
| 型號： | LMX2353TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
| 中文描述： | PHASE LOCKED LOOP, 2500 MHz, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 210K |
| 代理商： | LMX2353TM |
2.0 Programming Description
(Continued)
2.3.2.4 Power Down Mode
(PWDN_MODE)
Synchronous Power Down Mode
The PLL loop can be synchronously powered down by setting the PWDN mode bit HIGH (F2_19=1) and then asserting the power
down mode bit (N20 = 1). The power down function is gated by the charge pump. Once the power down program bit is loaded,
the part will go into power down mode upon the completion of a charge pump pulse event.
Asynchronous Power Down Mode
The PLL loop can be asynchronously powered down by setting the PWDN mode bit LOW (F2_19=0) and then asserting the
power down mode bit (N20 = 1). The power down function is NOT gated by the charge pump. Once the power down program bit
is loaded, the part will go into power down mode immediately.
2.3.3 Feedback Divide Ratio
(NB Counter)
NB_CNTR[9:0]
N_14
0
0
1
Divide Ratio
3
4
1023
N_18
0
0
1
N_17
0
0
1
N_16
0
0
1
N_15
0
0
1
N_13
0
0
1
N_12
0
0
1
N_11
0
1
1
N_10
1
0
1
N_9
1
0
1
Note:
B-counter divide ratio must be
≥
3.
NB_CNTR
≥
(NA_CNTR +2).
2.3.4 Swallow Counter Divide Ratio
(NA Counter)
NB_CNTR[4:0]
N_6
0
0
1
Divide Ratio
0
1
31
N_8
0
0
1
N_7
0
0
1
N_5
0
0
1
N_4
0
1
1
Note:
Swallow Counter Value: 0 to 31.
NB_CNTR
≥
(NA_CNTR +2).
2.3.5 Fractional Modulus Accumulator
(FRAC_CNTR)
Divide
Ratio
Modulus 15
0
1/15
2/15
14/15
N/A
Divide
Ratio
Modulus 16
0
1/16
2/16
14/16
15/16
FRAC_CNTR[3:0]
N_3
0
0
0
1
1
N_2
0
0
0
1
1
N_1
0
0
1
1
1
N_0
0
1
0
0
1
2.3.6 Pulse Swallow Function
f
VCO
= [N+F] x [f
OSC
/R] where N = (PxB) + A
f
VCO
:
Output frequency of external voltage controlled oscillator (VCO)
F:
Fractional ratio (contents of FRAC_CNTR divided by the fractional modulus)
B:
Preset divide ratio of binary 10-bit programmable counter (3 to 1023)
A:
Preset divide ratio of binary 5-bit swallow counter
0
<
A
<
31 {P=32};
0
<
A
<
15 {P=16};
A +2
<
B
f
OSC
:
Output frequency of the external reference frequency oscillator
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| LMX2353TM/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 16TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LMX2353TMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesizer |
| LMX2353TMX/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LMX2354 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2354SLB | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
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