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参数资料
| 型号： | MPC92433FA |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 1428 MHz, OTHER CLOCK GENERATOR, PQFP48 |
| 封装： | LQFP-48 |
| 文件页数： | 19/20页 |
| 文件大小： | 820K |
| 代理商： | MPC92433FA |
IDT / ICS DUAL LVPECL CLOCK SYNTHESIZER
8
MPC92433 REV. 3 NOVEMBER 10, 2008
MPC92433
1428MHZ DUAL OUTPUT LVPECL CLOCK SYNTHESIZER
Output Frequency Configuration
The MPC92433 is a programmable frequency source
(synthesizer) and supports an output frequency range of 42.5 –
1428 MHz. The output frequency fOUT is a function of the
reference frequency fREF and the three internal PLL dividers P, M,
and N. fOUT can be represented by this formula:
fOUT = (fREF ÷ P) M ÷ (NA, B)
(1)
The M, N and P dividers require a configuration by the user
to achieve the desired output frequency. The output divider,
7). The PLL feedback-divider M is the frequency multiplication
factor and the main variable for frequency synthesis. For a given
reference frequency fREF, the PLL feedback-divider M must be
configured to match the specified VCO frequency range in order
to achieve a valid PLL configuration:
fVCO = (fREF ÷ P) M and
(2)
1360
≤ fVCO ≤ 2856
(3)
The output frequency may be changed at any time by changing
the value of the PLL feedback divider M. The smallest possible
output frequency change is the synthesizer granularity G
(difference in fOUT when incrementing or decrementing M). At a
given reference frequency, G is a function of the PLL pre-divider
P and post-divider N:
G = fREF ÷ (P NA,B)
(4)
The NB divider configuration determines if the output QB
generates a 1:1 or 2:1 frequency copy of the QA output signal. The
purpose of the PLL pre-divider P is to situated the PLL into the
specified VCO frequency range fVCO (in combination with M). For
a given output frequency, P = 4 results in a smaller output
frequency granularity G, P = 2 results a larger output frequency
granularity G and also increases the PLL bandwidth compared to
the P = 2 setting.
The following example illustrates the output frequency range of
the MPC92433 using a 16-MHz reference frequency.
Example Output Frequency Configuration
If a reference frequency of 16 MHz is available, an output
frequency at QA of 250 MHz and a small frequency granularity is
desired, the following steps would be taken to identify the
appropriate P, M, and N configuration:
1.
desired output frequency or frequency range. According to
Table 7, a target output frequency of 250 MHz falls in the
fOUT range of 170 to 357 MHz and requires to set NA = 8
2.
Calculate the VCO frequency fVCO = fOUT NA, which is
2000 MHz in this example.
3.
Determine the PLL feedback divider: M = fVCO ÷P.
The smallest possible output granularity in this example
calculation is 500 kHz (set P = 4). M calculates to a value of
2000 ÷ 4 = 500.
4.
Configure the MPC92433 with the obtained settings:
M[9:0] = 0111110100b (binary number for M=500)
NA[2:0] = 010
(÷8 divider, see Table 9)
P = 1
(÷4 divider, see Table 8)
NB = 0
(fOUT, QB = fOUT, QA)
5.
Use either parallel or serial interface to apply the setting. The
I2C configuration bytes for this example are:
PLL_H=01010010b and PLL_L=11110100b.
Table 7. Frequency Ranges (fREF=16 MHz)
fOUT (QA) [MHz]
NA
MP
G [MHz]
680–1428
NA=2
170-357
2
4
340-714
4
2
340–714
NA=4
170-357
2
340-714
4
1
226.67–476
NA=6
170-357
2
1.33
340-714
4
0.66
170–357
NA=8
170-357
2
1
340-714
4
0.5
113.33–238
NA=12
170-357
2
0.66
340-714
4
0.33
85–178.5
NA=16
170-357
2
0.5
340-714
4
0.25
42.5–89.25
NA=32
170-357
2
0.25
340-714
4
0.125
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相关代理商/技术参数 |
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| MPC92439ACR2 | 功能描述:IC SYNTHESIZER LVPECL 32-LQFP 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:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| MPC92439EI | 功能描述:时钟合成器/抖动清除器 FSL 900MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| MPC92439EIR2 | 功能描述:时钟合成器/抖动清除器 FSL 900MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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