- 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)： | 7/22頁 |
| 文件大?。?/td> | 154K |
| 代理商： | ST70134A |
ST70134A
7/22
BLOCK DIAGRAM
Application principle is described in Figure 4.
A LP filter may be used on the TX path to reduce
DMT sidelobes and out of band noise influence on
the receiver. On the RX path, a HP filter must be
used in order to reduce the echo signal level and
to avoid saturation of the input stage of the
receiver. The POTS filter is used in both directions
to reduce crosstalk between ADSL signals and
POTS speech and signalling. Low pass POTS fil-
ter can be very simple for Lite - ADSL application
(see Figure 4).
RX Path
Speech Filter
An external bi-directional LC filter for up and
downstream POTS service splits the speech sig-
nal from the ADSL signal to the POTS circuits.
The ADSL analog front end integrated circuit does
not contain any circuitry for the POTS service but
it guarantees that bandwidth is not disturbed by
spurious signals from the ADSL-spectrum.
Channel Filters
The external analog circuits provide partial echo
cancellation by an analog filtering of the transmit
upstream signal. This is feasible because the
upstream and the downstream data are modu-
lated on separate carriers (FDM) (see Figure 4).
Signal to Noise Performance
RX- PATH SENSITIVITY AT MAXIMUM GAIN
The RX path sensitivity at the maximal RX-AGC of
the receiver is defined at -140dBm/Hz (for 100
ref) on the line. This figure corresponds to the
equivalent input noise of 31nVHz
-1/2
seen on the
line.
The maximum noise density within the pass band
can exceed the average value as follows:
RX path (max AGC setting):
<100nVHz
-1/2
@ 138kHz
<31nVHz
-1/2
for 250kHz < f
* For ADSL over ISDN, instead of SC2, HC2 1.1MHz LP filter is programmed.
Figure 4 :
Block Diagram
VCODAC
XTAL DRIVER
56
VCXOUT
60
59
35.328MHz
48
50
47
49
RXN(0:1)
RXP(0:1)
LP 1.1MHz
HC1
13 Bits A/D
Converter
7
20
12
10
9
11
LNA
PD
31
32
LP 138KHz
SC2 *
12 Bits D/A
Converter
-15.0dB
TXP
TXN
LPF
GRX
50k
R
2R
2R
R
GTX
LINE
DRIVER
1
2
TXn
HP POTSFILTER
LP POTSFILTER
POTS
1.1
Line
Zo = 100
4
Master Clock
35.328MHz
Nibbles
17.664MHz
Word
8.832/4.416MHz
RXn
CTRLIN
RESETN
T
50k
13
14
15
H
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)。