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參數(shù)資料
| 型號： | ST70134A |
| 英文描述： | ASCOT (TM) INTEGRATED ADSL CMOS ANALOG FRONT-END CIRCUIT |
| 中文描述： | 阿斯科特（TM）集成寬頻CMOS模擬前端電路 |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 154K |
| 代理商： | ST70134A |
ST70134A
3/22
DMT Signal (Done by the DMT companion
chip)
A DMT signal is basically the sum of N indepen-
dently QAM modulated signals, each carried over
a distinct carrier. The frequency separation of
each carrier is 4.3125kHz with a total number of
256 carriers (ANSI). For N large, the signal can be
modelled by a gaussian process with a certain
amplitude probability density function. Since the
maximum amplitude is expected to arise very
rarely, we decide to clip the signal and to trade-off
the resulting SNR loss against AD/DA dynamic. A
clipping factor (Vpeak/Vrms = "crest factor") of 5.3
will be used resulting in a maximum SNR of 75dB.
ADSL DMT signals are nominally sent at an aver-
age of -38dBmHz (-1.65dBm/carrier) with a maxi-
mal power of 15.7mW for the transmitter
(upstream for ADSL over Pots, DMT carriers are
Table 1 :
Target Signal Levels (on the line)
from 7 to 31, for ADSL over ISDN DMT carriers
are from 31 to 64).
Maximum / Minimum Signal Levels
The following table gives the transmitted and
received signal levels for CPE (ATU-R) and, for
reference, at ATU-C. All the levels are referred to
the line voltages (i.e. after hybrid and transform-
ers in TX direction, before hybrid and transformer
in RX direction).
Note that signal amplitudes shown below are for
illustration purpose and depending on the transmit
power and line impedance signal amplitudes can
differ from these values.
The reference line impedance for all power calcu-
lations is 100
.
Package
The ST70134 is packaged in a 64-pin TQFP pack-
age (body size 10x10mm, pitch 0.5mm).
* Power cut back software co facility.
Parameter
ATU - R
ATU - C
(for reference)
RX
TX
RX
TX
Max level
3.95 Vpdif *
6.8 Vpdif
1.66 mVpdif
15.8 Vpdif *
Max RMS level
791 mVrms
671 mVrms
168 mVrms
3.16 Vrms
Min level
42 mVpdif
839 mVpdif
54 mVpdif
3.95 Vpdif
Min RMS level
8 mVrms
168 mVrms
11 mVrms
791 mVrms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST70134-ST70135A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ASCOT ADSL MODEM CHIP SET FOR CPE |
| ST70134TR | 功能描述:電信線路管理 IC ADSL DMT Transceiver 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 |
| ST70135 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ASCOTTM DMT TRANSCEIVER |
| ST70135A | 制造商:STMicroelectronics 功能描述:Modem Chip Single 144-Pin PQFP |
| ST70136 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CPE ADSL ANALOG FRONT END |
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