- 您現(xiàn)在的位置：買賣IC網 > PDF目錄68812 > 73M1903-IVTR/F (MAXIM INTEGRATED PRODUCTS INC) SPECIALTY CONSUMER CIRCUIT, PDSO20 PDF資料下載
參數(shù)資料
| 型號： | 73M1903-IVTR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, MO-153AC, TSSOP-20 |
| 文件頁數(shù)： | 39/47頁 |
| 文件大小： | 541K |
| 代理商： | 73M1903-IVTR/F |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁當前第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁
73M1903 Data Sheet
DS_1903_032
44
Rev. 2.1
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.
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 73m1903 where Ichp is kept at a higher
value until lokdet 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 should
be done in sequence starting from register 08h ending in register 0dh. 0dh register should be the last one
to be written to. This will be 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 through 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
相關PDF資料 |
PDF描述 |
|---|---|
| 73M1903C-IM/F | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 73M1903C-IMR/F | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 73M1903C-IM | SPECIALTY CONSUMER CIRCUIT, QCC32 |
| 73M1903C-IM | SPECIALTY CONSUMER CIRCUIT, QCC32 |
| 73S1209F-44IM/F | POWER SUPPLY MANAGEMENT CKT, QCC44 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 73M1906B-IM/F | 功能描述:電信線路管理 IC DAA-FXO VOLP System Host Side 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 |
| 73M1906B-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 |
| 73M1906B-IMR/F | 功能描述:電信線路管理 IC DAA-FXO VOLP System Host Side 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 |
| 73M1906B-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 |
| 73M1906B-IVT/F | 功能描述:電信線路管理 IC DAA-FXO VOLP System Host Side 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。