- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16271 > 73M1903-EVM-ETSI (Maxim Integrated Products)BOARD DEMO 73M1903 ETSI 203IMPED PDF資料下載
參數(shù)資料
| 型號： | 73M1903-EVM-ETSI |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/47頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DEMO 73M1903 ETSI 203IMPED |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 主要目的： | 接口，模擬前端（AFE） |
| 已用 IC / 零件： | * |
| 主要屬性： | * |
| 次要屬性： | * |
| 已供物品： | * |
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頁當前第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
22
Rev. 2.1
5.1
Transmit Levels
The 16-bit transmit code word written by the DSP to the Digital Sigma-Delta Modulator (DSDM) (via TIF)
has a linear relationship with the analog output signal. So, decreasing a code word by a factor of 0.5 will
result in a 0.5 (-6 dB) gain change in the analog output signal.
The following formula describes the relationship between the transmit code word and the output level at
the transmit pins (TXAP/TXAN):
Vout (V) = 2 * code/32,767 * DSDMgain * dacGAIN * VREF * TLPFgain * SMFLTgain * FreqFctr
Vout is the differential peak voltage at the TXAP and TXAN pins.
Code is the 16-bit, two’s compliment transmit code word written out by the DSP to the DSDM (via TIF).
The code word falls within a range of
± 32,767. For a sinusoidal waveform, the peak code word should
be used in the formula to obtain the peak output voltage.
DSDMgain is the scaling factor used on the transmit code word to reduce the possibility of saturating the
modulator. This value is set to 0.640625(–3.555821 dB) at dc in the 48 tap transmit interpolation filter
(TIF) that precedes DSDM.
dacGAIN is the gain of the DAC. The value dacGAIN is calculated based on capacitor values inside
DAC1 and dacGAIN=8/9=0.8889. The number 32,767 refers to the code word that generates an 82%
“1’s” pulse density at the output of the DSDM. As one can see from the formula, the D to A conversion is
dependent on the level of VREF. Also when TXBST1 bit is set, VREF is increased from 1.36 V to 1.586 V
to allow higher transmit level or 16.6% increase in gain. This bit is intended for enhancing the DTMF
transmit level and should not be used in data mode.
TLPFgain is the gain of TLPF and nominally equals to 0.00 dB or 1.0.
SMFLTgain is the gain of SMFLT and nominally equal to 1.445 or 3.2 dB.
When TXBST0 bit is set, the gain is further increased by 1.65 dB (1.21) for the total of 4.85 dB. This is to
accommodate greater hybrid insertion loss encountered in some applications.
FreqFctr shows dependency of the entire transmit path on frequency. See Figure 10.
With the transmit code word of +/- 32,767, the nominal differential swing at the transmit pins at dc is:
Vout (V) = 2 * code/32,767 * DSDMgain * dacGAIN * VREF * TLPFgain * SMFLTgain * FreqFctr
= 2 * 32,767/32767 * 0.6640625 * 0.8889 * 1.36 * 1.0 * 1.4454 * 1.0 = 2.31Vpk diff.
When TXBST1 bit is set, Vout (V) = 1.166 * 2.31= 2.693 Vpk diff.
When TXBST0 bit is set, Vout (V) = 1.21 * 2.31= 2.795 Vpk diff, if not limited by power supply or internal
reference.
When both TXBST1 and TXBST0 are set to 1, Vout (V) = 1.166 * 1.21 * 2.31 = 3.259 Vpk diff.
相關PDF資料 |
PDF描述 |
|---|---|
| M3UFK-1618J | IDC CABLE - MKS16K/MC16G/MCF16K |
| GBM22DTKT | CONN EDGECARD 44POS DIP .156 SLD |
| VI-JW2-EZ-F2 | CONVERTER MOD DC/DC 15V 25W |
| CM453232-6R8JL | INDUCTOR 6.8UH 285MA SMD |
| M3UGK-1618J | IDC CABLE - MKS16K/MC16G/MCS16K |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝: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-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 |
| 73M1903-IMR/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-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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。