參數(shù)資料
型號(hào)： 73M1903C-IM
廠商： TERIDIAN SEMICONDUCTOR CORP
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, QCC32
封裝： LEAD FREE, QFN-32
文件頁(yè)數(shù)： 18/45頁(yè)
文件大?。?/td> 459K
代理商： 73M1903C-IM
73M1903C
Modem Analog Front End
DATA SHEET
Page: 25 of 45
2005 TERIDIAN Semiconductor Corporation
Rev 3.4
Transmit Power - dBm
To calculate the analog output power, the peak voltage must be calculated and the peak to rms ratio
(crest factor) must be known. The following formula can be used to calculate the output power, in dBm
referenced to 600.
Pout (dBm) = 10 * log [ ( Vout (V) / cf )
2 / ( 0.001 * 600 ) ]
The following example demonstrates the calculation of the analog output power given a 1.2kHz FSK tone
(sine wave) with a peak code word value of 11,878 sent out by the DSP.
The differential output voltage at TXAP-TXAN will be:
With FreqFctr = 1.02, (See Figure 10)
Vout (V) = 2 * (11,878/32,767) * 0.6640625 * 0.8889 * 1.36 * 1.0 * 1.4454 * 1.02 = 0.841Vpk.
The output signal power will be:
Pout (dBm) = 10 * log [(0.841 / 1.41)
2 / (0.001 * 600) ] = - 2.29dBm.
Transmit Type crest factor Max line level
V.90
4.0
-12dBm
QAM
2.31
-9dBm
DPSK
1.81
-9dBm
FSK
1.41
-9dBm
DTMF
1.99
-5.7dBm
Table 11: -Peak to RMS ratios and maximum transmit
levels for various modulation types
Control Register (CTRL1): Address 00h
Reset State 08h
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
ENFE
SelTX2
DTMFBST TXBST0
TXDIS
RXG1
RXG0
RXGAIN
ENFE
1 =
Enable the digital filters and analog front end.
0 =
Disable the analog blocks shut off the clocks to the digital and analog receive/transmit
circuits.
SelTX2
1 = Selects Secondary transmitter (TXAP2/TXAN2) if TXDIS=0
0 = Selects Primary transmitter (TXAP1/TXAN1) if TXDIS=0
DTMFBST 1 =
Add a gain of 0.83dB(10%) to the transmitter; also the common mode voltage of the
transmit path is increased to 1.375V. This is intended for enhancing DTMF transmit
power only and should not be used in data mode.
0 =
No gain is added
TXBST0
1 =
A gain of 1.5dB(18.9%) is added to the transmitter
0 =
The gain of the transmitter is nominal
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(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
73M1903C-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
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(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
73M1903C-IMR/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
73M1903-EVM-600 功能描述:網(wǎng)絡(luò)開(kāi)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(píng)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
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