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参数资料
| 型号： | LMX2354TM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24 |
| 封装： | TSSOP-24 |
| 文件页数： | 11/26页 |
| 文件大小： | 453K |
| 代理商： | LMX2354TM/NOPB |
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+4B+ 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 VCC/2. The test waveform has an edge rate of 0.6 V/ns
with amplitudes of 2.2V @ VCC=2.7V and 2.6V @ VCC = 5.5V.
LMX2354
www.national.com
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相关代理商/技术参数 |
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| LMX2354TMX/NOPB | 功能描述:IC FREQ SYNTH 2.5GHZ 24-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:PLLatinum™ 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LMX2355SLB | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2355TM | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2360 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2360TMX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
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