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參數(shù)資料
| 型號： | 73M1903-EVM-600 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/47頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DEMO 73M1903 PPU USA/JAPAN |
| 產(chǎn)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： | * |
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73M1903 Data Sheet
DS_1903_032
18
Rev. 2.1
4
Modem Receiver
A differential receive signal applied at the RXAP and RXAN pins or the output signal at TXAP and TXAN
pass through a multiplexer, which selects the inputs to the ADC. In normal mode, RXAP/RXAN are
selected. In analog loopback mode, TXAP/TXAN are selected. The DC bias for the RXAP/RXAN inputs
is supplied from TXAP/TXAN through the external DAA in normal conditions. (See Appendix A) It can be
supplied internally, in the absence of the external DAA, by setting RXPULL bit in Control Register 2.
The output of the multiplexer goes into a second-order continuous time, Sallen-Key, low-pass filter (AAF)
with a 3 dB point at approximately 40 kHz. The filtered output signal is the input to an analog sigma-delta
modulator (ASDM), clocked at an over sampling frequency of 1.536 MHz for Fs = 8 kHz, which converts
the analog signal to a serial bit stream with a pulse density that is proportional to the amplitude of the
analog input signal.
There are three gain control bits for the receive path. The RXGAIN bit in control register one results in a
+20 dB gain of the receive signal when set to a “1”. This 20 dB of gain compensates for the loss through
the DAA while on hook. It is used for Caller ID reception. This gain is realized in the front end of ASDM.
The other gain bits in control register 1, RXG1:0, compensate for differences in loss through the receive
path.
Table 12: Receive Gain
RXG1
RXG0
Receive Gain Setting
0
6 dB
0
1
9 dB
1
0
12 dB
1
0 dB
The output of ASDM is a serial bit stream that feeds three digital sinc
3 filters. Each filter has a [sin(x)/x]3
frequency response and provides a 16 bit sample every 288 clock cycles. The filters are synchronized so
that there is one sample available after every 96 analog samples or at a rate of 16 kHz for Fs=8 kHz. The
output of the sinc
3 filter is a 17 bit, two’s compliment number representing the amplitude of the input
signal. The sinc
3 filter, by virtue of holding action (for 96 sample period), introduces a droop in the
passband that is later corrected for by a 48 tap FIR filter that follows. The maximum digital word that can
be output from the filter is 0d800h. The minimum word is 12800h.
The output of the sinc
3 filter is input to another 48 tap digital FIR filter that provides an amplitude
correction in the passband to the output of the sinc
3 filter as well as rejecting noise above Fs/2 or 4 kHz
for Fs=8 kHz. The output of this filter is then decimated by a factor of 2; so, the final output is 16 bit, two’s
compliment samples at a rate of 8 kHz.
3 filter’s frequency response of ASDM along with the 48 tap digital
FIR response that compensates for it and the resulting overall response of the receiver.
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| 73M1903-EVM-ETSI | 功能描述:網(wǎng)絡開發(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(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(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 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
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