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參數(shù)資料
| 型號： | PS2500AIT |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | Low-Power Direct Digital Modulation Frequency Synthesizer |
| 中文描述： | 低功耗直接數(shù)字調(diào)制頻率合成器 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 184K |
| 代理商： | PS2500AIT |
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PS2500 2.2 GHz Fractional-N Frequency Synthesizer
- 8 -
Philsar Semiconductor Inc.
146 Colonnade Road S.
Nepean, Ontario, Canada
K2E 7Y1
Tel: 613-274-0922
Fax: 613-274-0915
www.philsar.com
PMP-001-DS2 V1.2
The resulting main VCO frequency is 902.453
Step size is 76.3 Hz
Case 2:
Assuming a desired frequency
F
VCO_main
of 917.7786 MHz and a crystal frequency of 19.2 MHz
with operation of the synthesizer in 10-bit mode.
Since the maximum internal reference frequency
F
div_ref
is 25 MHz, the crystal frequency does not require
the internal division to be greater than 1, giving us a
F
div_ref
of 19.2 MHz
1
. Therefore, using:
N
fractional
= F
VCO_main
/
F
div_ref
= 917.7786 x 19.2
= 47.80139
The value to be programmed in the
Main Divider Register
is:
N
reg
= Round [N
fractional
] - 32
= Round [47.80139] - 32
= 48 - 32
= 16
= 0 0001 0000 (binary)
With the modulator in 10-bit mode, the value to be programmed in the
Main Dividend Registers
is:
dividend = Round (divider x (Nfractional - Nreg - 32))
= Round (1024 x (47.80139 - 16 - 32))
= Round (1024 x (-0.19861))
= Round (-203.38133)
= -203 (decimal)
= 11 0011 0101 (binary)
Where
11 0011 0101
is loaded in the
Main Dividend MSB Register
.
Summarizing,
Main Divider Register = 0 0001 0000
Main Dividend MSB Register =11 0011 0101
The resulting VCO frequency is 917.7938 MHz
Step size is 18.75 kHz
1.
The frequency step size for this case is 19.2 MHz divided by 2
10
giving 18.75 kHz.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PS2500AIT-ES2/2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Power Direct Digital Modulation Frequency Synthesizer |
| PS2500GA | 制造商:SENSORTECHNICS 制造商全稱:Sensortechnics GmbH 功能描述:OEM silicon stainless steel pressure sensor |
| PS2500GC | 制造商:SENSORTECHNICS 制造商全稱:Sensortechnics GmbH 功能描述:OEM silicon stainless steel pressure sensor |
| PS2500VA | 制造商:SENSORTECHNICS 制造商全稱:Sensortechnics GmbH 功能描述:OEM silicon stainless steel pressure sensor |
| PS2500VC | 制造商:SENSORTECHNICS 制造商全稱:Sensortechnics GmbH 功能描述:OEM silicon stainless steel pressure sensor |
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