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參數資料
| 型號： | 73M1903C-IM |
| 廠商： | TERIDIAN SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, QCC32 |
| 封裝： | LEAD FREE, QFN-32 |
| 文件頁數： | 39/45頁 |
| 文件大小： | 459K |
| 代理商： | 73M1903C-IM |
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73M1903C
Modem Analog Front End
DATA SHEET
Page: 44 of 45
2005 TERIDIAN Semiconductor Corporation
Rev 3.4
The ratio, Nnco1/Dnco1 = 8/125, is used to form a divide ratio for the NCO in prescaler and Nnco2/Dnco2
=5/96 for the NCO in the PLL.
Pre-scaler NCO: From Nnco1/Dnco1 = 8/125,
Pdvsr = Integer [ Dnco1/Nnco1 ] = 15;
Prst[2:0] = Nnco1 – 1 = 7;
Dnco1/Nnco1 = 125/8 = 15.625 suggests a divide sequence of {
÷16,÷16,÷15,÷16,÷16,÷15,÷16,÷15}, or
Pseq = {1,1,0,1,1,0,1,0} = DAh.
PLL NCO: From Nnco2/Dnco2 = 5/96,
Ndvsr = Integer [ Dnco2/Nnco2 ] = 19;
Nrst[2:0] = Nnco2 – 1 = 4;
Dnco2/Nnco2 = 19.2 suggests a divide sequence of {
÷19, ÷19, ÷19, ÷19, ÷20}, or
Nseq = {x,x,x,0,0,0,0,1} = x1h.
Example4:
Crystal Frequency = 24.576MHz; Desired Sampling Rate, Fs = 16.0kHz
Step 1. First compute the required VCO frequency, Fvco, corresponding to
Fs = 2.4kHz x 20/3 = 16.0kHz.
Fvco = 2 x 2304 x Fs = 2 x 2304 x 2.4kHz x 20/3 = 73.728MHz.
Step 2. Express the required VCO frequency divided by the Crystal Frequency as a ratio of two integers.
This is initially given by :
MHz
Fxtal
Fvco
576
.
24
20/3
2.4kHz
2304
2
/
=
.
After a few rounds of simplification this reduces to:
24
1
8
1
Dnco2
Nnco2
Dnco1
Nnco1
)
8
1
(
)
1
24
(
/
=
=
Fxtal
Fvco
The ratio, Nnco1/Dnco1 = 1/1, is used to form a divide ratio for the NCO in prescaler and Nnco2/Dnco2
=1/24 for the NCO in the PLL.
Pre-scaler NCO: From Nnco1/Dnco1 = 1/8,
Pdvsr = Integer [ Dnco1/Nnco1 ] = 8 = 08h,
Prst[2:0] = Nnco1 – 1 = 0; this means NO fractional divide. It always does ÷8. Thus Pseq becomes “don’t
care”.
Pseq = {x,x,x,x,x,x,x,x}= xxh.
PLL NCO: From Nnco2/Dnco2 = 1/24,
Ndvsr = Integer [ Dnco2/Nnco2 ] = 24 = 18h,
Nrst[2:0] = Nnco2 – 1 = 0; this means NO fractional divide. It always does ÷24. Thus Nseq becomes
“don’t care”.
Nseq = {x,x,x,x,x,x,x,x} = xxh.
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相關代理商/技術參數 |
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|---|---|
| 73M1903C-IM/F | 功能描述:電信線路管理 IC Modem Analog Front End RoHS:否 制造商:STMicroelectronics 產品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903C-IM/F1 | 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903C-IMR/F | 功能描述:電信線路管理 IC Modem Analog Front End RoHS:否 制造商:STMicroelectronics 產品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903C-IMR/F1 | 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903-EVM-600 | 功能描述:網絡開發工具 73M1903 w/Ppu & 600 Ohm Term-Usa & Japan RoHS:否 制造商:Rabbit Semiconductor 產品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數據速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
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