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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)： | 10/22頁 |
| 文件大?。?/td> | 154K |
| 代理商： | ST70134A |
ST70134A
10/22
TX Pre-driver Capability
The pre-driver drives an external line power amplifier which transmits the required power to the line.
Table 10 :
TX Pre-driver
TX Filter
The TX filter acts not only to suppress the DMT sidebands but also as smoothing filter on the D/A conver-
tor’s output to suppress the image spectrum. For this reason it must be realized in a continuous time
approach.
ATU-R TX Filter
The purpose of this filter is to remove out-of-band noise of the TX path echoed to the RX path. In order to
meet the transmitter spectral response, an additional filtering must be (digitally) performed. The inte-
grated filter has the following characteristics:
Table 11 :
Integrated SC Filter Characteristics
Note: The total TX path (including DAC) group delay distortion is 16
μ
s (i.e. = 15
μ
s + 1
μ
s of DAC).
TX drive level to the external line
driver for max. AGC setting
1.5 Vpdif
External line driver input impedance:
resistive
capacitive
> 500
< 30pF
Pre-driver characteristics:
Closed loop gain:
-15dB...0dB with step = 1dB
Output characteristics
Output offset voltage (0dB)
< 10mV
Output noise voltage (0dB)
< 150nVHz
-1/2
@ f > 250kHz
< 500nVHz
-1/2
@ 34.5kHz < f < 138kHz
0dB
Output common mode voltage:
1.6V < Vcm < 1.7V
Description
Value/Unit
Maximum input level
1Vpd
Maximum output level
1Vpd
Type
4th order chebytchef
Frequency band
138kHz (0% setting see below)
Frequency tuning
-25% -> +25%
Max. in-band ripple
1dB
Matlab Model
Default cut-off frequency @ -3dB
Actual cut-off @ -3dB
SC Frequency selection register
[B,A] = cheby1 (4,0.5,W0,’s’) {ripple = 0.5}
F0 = 151.8kHz
W0 = 2*pi*F0/((17+n)/16)
n = -4,..,3 see (AFE settings, Table 19)
Total TX filter group delay
< 50
μ
s @ 34.5kHz < f < 138kHz
Total TX filter group delay distortion
< 20
μ
s @ 34.5kHz < f < 138kHz
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相關代理商/技術參數(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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