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參數(shù)資料
| 型號： | 73M1903C-IMR/F |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 39/48頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MODEM AFE MULTIREGIONAL 32QFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 通道數(shù)： | 2 |
| 電壓 - 電源，模擬： | 3 V ~ 3.6 V |
| 電壓 - 電源，數(shù)字： | 3 V ~ 3.6 V |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN（5x5） |
| 包裝： | 帶卷 (TR) |
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73M1903C Data Sheet
DS_1903C_033
44
Rev. 5.0
Example 2: Fs = 8.0 kHz or Fvco = 2 x 2304 x 8 kHz = 36.864 MHz, Fref = 2.304 MHz.
Ndvsr = Integer [Fvco/Fref] = 16 = 10h;
Nrst= 1-1 = 0 from Fvco/Fref = 16/1;
Nseq = {x,x,x,x,x,x,x,x} = xxh.
Example 3: Fs = 9.6 kHz or Fvco = 2 x 2304 x 9.6 kHz =44.2368 MHz, Fref = 2.4576 MHz.
Ndvsr = Integer [Fvco/Fref] = 18 = 16h;
Nrst= 1-1 = 0 from Fvco/Fref = 18/1;
Nseq = {x,x,x,x,x,x,x,x} = xxh.
Example 4: Fs = 16.0 kHz or Fvco = 2 x 2304 x 16.0 kHz =73.728 MHz, Fref = 3.072 MHz.
Ndvsr = Integer [Fvco/Fref] = 24 =18h;
Nrst= 1-1 = 0 from Fvco/Fref = 24/1;
Nseq = {x,x,x,x,x,x,x,x} = xxh.
It is important to note that in general the NCO based feedback divider will generate a fixed jitter pattern
whose frequency components are at Fref/Accreset2 and its integer multiples. The overall jitter frequency
will be a nonlinear combination of jitters from both pre-scaler and PLL NCO. The fundamental frequency
component of this jitter is at Fref/Prst/Nrst. The PLL parameters should be selected to remove this jitter.
Three separate controls are provided to fine-tune the PLL as shown in the following sections.
To ensure quick settling of PLL, a feature was designed into the 73M1903C where Ichp is kept at a higher
value until LockDet becomes active or Frcvco bit is set to 1, whichever occurs first. Thus, PLL is
guaranteed to have the settling time of less than one Frame Synch period after a new set of NCO
parameters had been written to the appropriate registers. The serial port register writes for a particular
sample rate must be done in sequence starting from register 08h ending in register 0Dh. 0Dh register
must be the last one to be written to. This is followed by a write to the next register in sequence (0Eh) to
force the transition of Sysclk from Xtal to Pllclk.
Upon the system reset, the system clock is reset to Fxtal/9. The system clock will remain at Fxtal/9 until
the Host forces the transition, but no sooner the second Frame Synch period after the write to 0Dh.
When this happens, the system clock will transition to PLLclk without any glitches thru a specially
designed deglitch MUX.
Examples of NCO Settings
Example 1
Crystal Frequency = 24.576 MHz; Desired Sampling Rate, Fs = 13.714 kHz(=2.4 kHz x 10/7 x 4)
Step 1. First compute the required VCO frequency, Fvco, corresponding to
Fs = 2.4 kHz x 10/7 x 4 = 13.714 kHz, or
Fvco = 2 x 2304 x Fs = 2 x 2304 x 2.4 kHz x 10/7 x 4 = 63.19543 MHz.
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
4
10/7
2.4kHz
2304
2
/
=
.
After a few rounds of simplification this ratio reduces to:
18
1
7
1
Dnco2
Nnco2
Dnco1
Nnco1
)
1
18
(
)
7
1
(
7
18
/
=
=
Fxtal
Fvco
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參數(shù)描述 |
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| 73M1903-EVM-600 | 功能描述:網(wǎng)絡(luò)開發(fā)工具 73M1903 w/Ppu & 600 Ohm Term-Usa & Japan RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| 73M1903-EVM-ETSI | 功能描述:網(wǎng)絡(luò)開發(fā)工具 73M1903 w/Etsi 203 Complex Imped. Term RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| 73M1903-EVM-WW | 功能描述:BOARD DEMO 73M1903 PPU WORLDWIDE RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| 73M1903-IM/F | 功能描述:電信線路管理 IC Modem AFE V.22Bis-V.92 RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| 73M1903-IM/F1 | 功能描述:電信線路管理 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
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