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參數(shù)資料
| 型號(hào)： | MTC20454-TQ-I |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | QUAD INTEGRATED ADSL CMOS ANALOG FRONT END CIRCUIT |
| 中文描述： | 四集成ADSL模擬前端的CMOS電路 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 513K |
| 代理商： | MTC20454-TQ-I |
MTC20454
6/15
Clock Driver Output CLKM
FUNCTIONAL DECRIPTION
The MTC20454 performs the analog portions of four ATU-C modems.
It has filters (with a programmable cut-off frequency) that use automatic continuous time tuning to avoid
time varying phase characteristics which can be of dramatic consequence for DMT modems. It requires
few external components, uses a 3.3 V supply and is packaged in a 100 pins TQFP in order to reduce
PCB area.
The following descriptions apply to each of the four analog front ends in the chip:
The Receiver (RX)
The DMT signal coming from the lines to the MTCMTC20454MTC2045420454 is first filtered by the two
following external filters:
■
POTS HP filter: Attenuation of speech and POTS signalling.
■
Channel filter: Attenuation of echo signal to improve RX dynamic.
The signal is amplified by a low noise gain stage (-15..+31 dB) then lowpass filtered to avoid anti-aliasing
and to ease further digital processing by removing unwanted high frequency out-of-band noise. A 12 bits
A/D converter samples the data at 8.832 MS/s, transforms the signal into a igital representation and sends
it to the DMT signal processor via the multiplexed digital interface.
The Transmitter (TX/TXE)
The 12 bits data at 8.832 Ms coming from the DMT signal processor through the multiplexed digital inter-
face are transformed by a D/A converter into an analog signal. This signal is then filtered to decrease DMT
sidelobes levels and meet the ANSI transmitter spectral response but also to reduce he 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 case of short loops provide attenuation provision
The Digital Interface
The digital part of the MTC20454 can be divided into two parts:
■
The data interface converts the multiplexed data from/to the DMT signal processor into a valid
representation for the TX DAC and RX ADC for the requested line.
■
The control interface allows the board processor to configure the MTC20454 paths (RX/TX gains, filter
band, ...) or settings.
Symbol
Parameters
Test Cond
Min
Max
Unit
V
OL
Low level output voltage
Iout = 4 mA
.15*DV
DD
V
V
OH
High level output voltage
Iout = 4 mA
.85*DV
DD
V
C
load
Load capacitance
30
pF
Dcycle
Duty cycle
45
55
%
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MTC20454-TQ-I1 | 功能描述:射頻無線雜項(xiàng) ASDL Analg Front End RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| MTC20455 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD ADSL DMT TRANSCEIVER |
| MTC20455-DQ-IS | 功能描述:電信集成電路 ADSL DMT Transceiver RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray |
| MTC20455MB-I | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD ADSL DMT TRANSCEIVER |
| MTC20455-MB-I1 | 功能描述:射頻收發(fā)器 ADSL DMT Transceiver RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
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