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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(yè)數(shù)： | 7/15頁(yè) |
| 文件大?。?/td> | 513K |
| 代理商： | MTC20454-TQ-I |
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MTC20454
ANALOG TX/RX SIGNALS
The reference impedance for all power calculations is 100 Ohm.
DMT Signal
A DMT signal is basically the sum of N independently QAM modulated signals, each carried over a distinct
carrier. The frequency separation of each carrier is 4.3125 KHz with a total number of 256 carriers (ANSI).
For a large N, the signal can be modelled by a gaussian process with a certain amplitude probability den-
sity function. Since the maximum amplitude is expected to arise very rarely, the signal is clipped to trade-
off the resulting SNR loss against AD/DA dynamic range.
A clipping factor (Vpeak/Vrms = “crest factor”) of 5 is used resulting in a maximum SNR of 75 dB. ADSL
DMT signals are nominally sent at -40 dBm/Hz +/- 3 dB (-3.65 dBm/carrier) with a maximal power of 100
mW for downlink transmitter and 4.5 mW for uplink transmitter. The minimum SNR+D needed for DMT
carrier demodulation is about (3*N+20) dB with a minimum of 38 dB where N is the constellation size of a
carrier (in bits).
Block Diagram
The transformer has a 1:2 ratio. The termination resistors are 12.5 Ohm in case of 100 Ohm lines. The
hybrid bridge resistors should be < 2.5 kOhm for low-noise. An HP filter must be used on the TX path to
reduce DMT sidelobes and out-of- band noise influence on the receiver. On the RX path, a LP 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 cross talk between ADSL signals and POTS speech
and signalling.
Figure 4. AFE Block Diagram (for detailed schematics see MTB20450-EBC reference design.)
DAC
276kHz
AAF
DAC
DAC
DAC
276kHz
AAF
276kHz
AAF
276kHz
AAF
1.1 mHz
HCDS
L
G
L0AGCtx
L0AGCrx
L0AACrx
L1AGCrx
L1AACrx
L2AGCrx
L2AACrx
L3AGCrx
L3AACrx
L
G
G
G
A
G
A
G
A
G
A
G
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L1AGCtx
L2AGCtx
L3AGCtx
1.1 mHz
HCDS
1.1 mHz
HCDS
1.1 mHz
HCDS
Tunng crcut
L/V - Ref
CTRL/TST
ifce
ADC
Dgita ifce
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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(wú)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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