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参数资料
| 型号： | MB881822AWQN-G-JN-ERE1 |
| 厂商： | FUJITSU LTD |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 100 MHz, OTHER CLOCK GENERATOR, PQCC24 |
| 封装： | 2.50 X 3.50 MM, 0.80 MM HEIGHT, 0.40 MM PITCH, PLASTIC, QFN-24 |
| 文件页数： | 4/32页 |
| 文件大小： | 938K |
| 代理商： | MB881822AWQN-G-JN-ERE1 |
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MB88182
12
DS04-29138-5E
<Frequency setting>
When setting each divider parameter of the oscillator to a register, the output frequency can be set.
Internal oscillation frequency and output frequency can be calculated with following formula:
Internal oscillation frequency (fvco*)
= Input frequency (fin) × M/N
* : Please set the fvco range from 16 MHz to 168 MHz.
Output frequency (fout*)
= fvco/K
* : Please set the fout range from 8 MHz to 100 MHz.
Set the output frequency to 8 MHz to 50 MHz for CLK3 and CLK4 setting registers when VDP is 1.8 V
± 0.15 V.
(Setting example)
fin : 19.2 MHz, fout : 29.6 MHz
M divider parameter : 222 (
= 0DEH) , N divider parameter : 144 ( = 090H) , K divider parameter : 1 ( = 01H)
(19.2
× 222 / 144) / 1 = 29.6 (MHz) (fvco : 19.2 × 222 / 144 = 29.6 (MHz) )
Note: The recommended setting value of the VCO gain and the M divider depends on the internal oscillation
frequency.
Also, the recommended setting value of the Charge Pump depends on the setting values of the VCO gain
and the M divider. Please confirm the recommended value with the Fujitsu Semiconductor support tool.
Contact the sales representatives for details on the support tools.
<Modulation frequency setting>
Modulation frequency can be set by writing L divider parameter to the register.
The average of modulation frequency can be calculated with following formula:
(Setting example) fin : 19.2 MHz, average of modulation freq. 19.2 / (266
× 6) × 1000 = Approximately 12.0 (kHz)
Input frequency
266
× L
(L
= 1, 2, 3, 4, 5, 6, 7, 8)
bit30
bit29
bit28
L divider parameter
000
8
001
1
010
2
011
3
100
4
101
5
110
6
(Recommended value)
111
7
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