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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 8/22頁(yè) |
| 文件大小： | 154K |
| 代理商： | ST70134A |
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ST70134A
8/22
RX-PATH NOISE AT MINIMUM GAIN
At the minimum AGC the total average thermal
noise of the analog RX-path at the ADC input
should be lower than the ADC quantisation noise.
The maximum noise density within the pass band
can exceed the average value as follows:
RX path (min AGC setting) <500nVHz
-1/2
@
138kHz < f
These noise specifications correspond to 10bit
resolution of the complete RX-path.
Table 3 :
RX Common-mode Voltage
AGC of RX Path
The AGC gain in the RX-path is controlled through
a 5-bits digital code.
Four inputs are provided for RX input and the
selection is made with the RXMUX bits of the
CTRLIN interface.
This can be used to make lower gain paths in
case of high input signal.
Table 4 :
AGC Characteristics
RX Filters
The combination of the external filter (an LC lad-
der filter typically) with the integrated lowpass fil-
ter must provide:
– Echo reduction to improve dynamic range.
– DMT sidelobe and out of band (anti-aliasing) at-
tenuation.
– Anti alias filter (60dB rejection @ image frequency).
RX Filters
The integrated filter have the following character-
istics:
Description
Value/Unit
Common mode signal VCM
at RXIN1 and RXIN2:
1.6V < VCM <1.7V
Description
Value/Unit
Input referred noise(max. gain)
31nVHz
-1/2
Max. input level
1Vpd
Max. output level
1Vpd
Gain range
0 to 31dB with
step = 1dB
Gain and step accuracy
± 0.3dB
Table 5 :
Integrated HC Filter Characteristics
Description
Value / Unit
Maximum input level
Maximum output level
Type
Frequency band
Frequency tuning
Max. in-band ripple
Matlab Model
Default cut off frequency @ -3dB
Actual cut off @ -3dB
HC Freq. selection register
1Vpd
1Vpd
3rd order butterworth
1.104MHz (0% setting, see below)
-43.75% -> +0%
1dB
[B, A] = butter (3, w0, 's')
F0 = 1560KHz
w0 = 2 * pi * F0/((20 + n)/16)
n = -4,..,3 see (AFE settings,Table 19)
Table 6 :
Phase Characteristic
Description
Value / Unit
Total RX filter group delay
< 50
μ
s @ 138kHz < f < 1.104MHz
Total RX filter group delay distortion
< 15
μ
s @ 138kHz < f < 1.104MHz
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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(chēng):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(lèi)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(chēng):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(chēng):STMicroelectronics 功能描述:CPE ADSL ANALOG FRONT END |
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