- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383839 > ST70134A ASCOT (TM) INTEGRATED ADSL CMOS ANALOG FRONT-END CIRCUIT PDF資料下載
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)： | 2/22頁 |
| 文件大?。?/td> | 154K |
| 代理商： | ST70134A |
ST70134A
2/22
Figure 1 :
Block Diagram
The Receiver (RX) Part
The DMT signal coming from the line to the
ST70134 is first filtered by two external filters,
Pots HP and channel filters.
An analog multiplexer allows the selection
between two input ports which can be used to
select an attenuated (0, 10dB for ex.) version of
the signal in case of short loop or large echo.
The signal is amplified by a low noise gain stage
(0-31dB) then low-pass filtered to avoid aliasing
and to ease further digital processing by removing
unwanted high frequency out-of-band noise.A
13-bit A/D converter samples the data at
8.832MS/s (or 4.416MS/s in alternative mode),
transforms the signal into a digital representation
and sends it to the DMT signal processor via the
digital interface.
The Transmitter (TX) part
The 12-bit data words at 8.832MS/s (or 4.416MS/
s) coming from the DMT signal processor through
the digital interface are transformed by D/A con-
verter into a analog signal.
This signal is then filtered to decrease DMT side-
lobes level and meet the ANSI transmitter spectral
response but also to reduce the out-of-band noise
(which can be echoed to the RX path) to an
acceptable level. The pre-driver buffers the signal
for the external line driver and in case of short
loop provide attenuation (-15...0dB).
The VCXO Part
The VCXO is divided in a XTAL driver and a auxil-
iary 8 bits DAC for timing recovery.The XTAL
driver is able to operate at 35.328MHz.
The DAC which is driven by the CTRLIN pin pro-
vides a current output with 8-bit resolution and
can be used to tune the XTAL frequency with the
help of external components.
A time constant between DAC input and VCXO
output can be introduced (via the CTLIN interface)
and programmed with the help of an external
capacitor (on VCOC pin).See chapter ’VCXO’ for
the external circuit related to the VCXO.
The Digital Interface Part
The digital part of the ST70134 can be divided in 2
sections:
– The data interface converts the multiplexed data
from/to the DMT signal processor into valid
representation for the TX DAC and RX ADC.
– The control interface allows the board processor
to configure the STL70134 paths (RX/TX gains,
filter band, ...) or settings (OSR, vcodac enable,
digital / analog loopback,...).
R-MOS-C
TUNING
I/V-REF
XTAL-DRIVER
VCXO DAC
G = -15...0dB
step = 1dB
AGCtx
TXP
TXN
1.1MHz
HC2
1.1MHz
HC1
138kHz
SC2
DIGITAL
IF
DAC
AGCrx
G = 0...31dB
step = 1dB
RXP(0:1)
RXN(0:1)
ADC
13 Bits
12 Bits
Rx (0:3)
Tx (0:3)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72521B | ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE |
| ST72521BAR6 | ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE |
| ST72521BAR9 | ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE |
| ST72521BM6 | ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE |
| ST72521BM9 | ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE |
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。