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參數(shù)資料
| 型號： | LMX2354 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| 中文描述： | PLLatinum小數(shù)分頻射頻/中頻整數(shù)雙低功耗頻率合成器? |
| 文件頁數(shù)： | 19/23頁 |
| 文件大小： | 403K |
| 代理商： | LMX2354 |
Programming Description
(Continued)
5.3 QUADRATURE MODULUS PRESCALER
The LMX2354 contains a quadrature modulus prescaler, consisting of a prescaler, A counter, B counter and C counter. Once the
N value is known, the A, B, and C values can be calculated by:
C = N div P
B = (N–C
P) div 4
A = N mod 4
For the divide ratio to be legal, it is also required:
C
>
=max {A, B} + 2
fvco = [N + F] x [fosc / R ]
N = P
C + 4
B + A
F:
Fractional ratio (contents of FRAC_CNTR divided by the fractional modulus)
f
vco
: Output frequency of external voltage controlled oscillator (VCO)
C:
Preset value of the C counter
B:
Preset value of the B counter
A:
Preset value of the A counter
f
osc
: Output frequency of the external reference frequency oscillator
R:
Preset divide ratio of binary 15-bit programmable reference counter (3 to 32,767)
P:
Preset modulus of quadrature modulus prescaler
8/9/12/13
550 MHz–1.2 GHz
16/17/20/21
1.2 GHz–2.5 GHz
5.4 SERIAL DATA INPUT TIMING
20004803
Note:
Data shifted into register on clock rising edge. Data is shifted in MSB first.
TEST CONDITIONS:
The Serial Data Input Timing is tested using a symmetrical waveform around V
CC
/2. The test waveform has an edge rate of 0.6 V/ns
with amplitudes of 2.2V
@
V
CC
=2.7V and 2.6V
@
V
CC
= 5.5V.
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LMX2354SLBX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LMX2354SLBX/NOPB | 功能描述:IC FREQ SYNTH DUAL 24-LAMCSP 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(shè)備封裝:* 包裝:* |
| LMX2354SLDX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LMX2354SLEX | 制造商:Texas Instruments 功能描述: |
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