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參數(shù)資料
| 型號(hào)： | AFE1105E |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:12; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-97 RoHS Compliant: No |
| 中文描述： | HDSL / MDSL模擬前端 |
| 文件頁(yè)數(shù)： | 9/10頁(yè) |
| 文件大?。?/td> | 206K |
| 代理商： | AFE1105E |
9
AFE1105
DISCUSSION OF
SPECIFICATIONS
UNCANCELLED ECHO
The key measure of transceiver performance is uncancelled
echo. This measurement is made as shown in the diagram of
Figure 4. The AFE is connected to an output circuit includ-
ing a typical 1:2 line transformer. The line is simulated by a
135
resistor. Symbol sequences are generated by the tester
and applied both to the AFE and to the input of an adaptive
filter. The output of the adaptive filter is subtracted from the
AFE output to form the uncancelled echo signal. Once the
filter taps have converged, the RMS value of the uncancelled
echo is calculated. Since there is no far-end signal source or
additive line noise, the uncancelled echo contains only noise
and linearity errors generated in the transmitter and receiver.
The data sheet value for uncancelled echo is the ratio of the
RMS uncancelled echo (referred to the receiver input through
the receiver gain) to the nominal transmitted signal (13.5dBm
into 135
, or 1.74Vrms). This echo value is measured under
a variety of conditions: with loopback enabled (line input
disconnected); with loopback disabled under all receiver
gain ranges; and with the line shorted (S
1
closed in Figure 4).
LAYOUT
The analog front end of an HDSL system has a number of
conflicting requirements. It must accept and deliver digital
outputs at fairly high rates of speed, phase-lock to a high-
speed digital clock, and convert the line input to a high-
precision (14-bit) digital output. Thus, there are really three
sections of the AFE1105: the digital section, the phase-
locked loop, and the analog section.
The power supply for the digital section of the AFE1105 can
range from 3.3V to 5V. This supply should be decoupled to
digital ground with a ceramic 0.1
μ
F capacitor placed as
close to DGND (pin 12) and DV
DD
(pin 13) as possible.
Ideally, both a digital power supply plane and a digital
ground plane should run up to and underneath the digital
pins of the AFE1105 (pins 3 through 26). However, DV
DD
may be supplied by a wide printed circuit board (PCB) trace.
A digital ground plane underneath all digital pins is strongly
recommended.
The phase-locked loop is powered from PV
DD
(pin 2) and its
ground is referenced to PGND (pin 1). Note that PV
DD
must
be in the 4.75V to 5.25V range. This portion of the AFE1105
should be decoupled with both a 10
μ
F Tantalum capacitor
FIGURE 4. Uncancelled Echo Test Diagram.
rxHYB
N
AFE1105
rxLINE
P
rxLINE
N
REF
N
rxD13 - rxD0
rxHYB
P
txLINE
N
txLINE
P
txDAT
P
100pF
0.01μF
576
1.54k
13
13
5.6
1:2
5.6
0.047μF
150
576
0.047μF
2k
2k
100pF
750
Transmit
Data
Uncancelled
Echo
0.1μF
750
0.1μF
2k
2k
135
S
1
A
F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFE1105E/1K | 功能描述:電信線路管理 IC HDSL/MDSL Analog Front End 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 |
| AFE1105E/1KG4 | 功能描述:電信線路管理 IC HDSL/MDSL Analog Front End 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 |
| AFE1105EG4 | 功能描述:電信線路管理 IC HDSL/MDSL Analog Front End 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 |
| AFE1115 | 制造商:BB 制造商全稱:BB 功能描述:HDSL/MDSL ANALOG FRONT END WITH VCXO |
| AFE1115E | 功能描述:IC ANALOG FRONT END 56-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模擬前端 (AFE) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):- 通道數(shù):2 功率（瓦特）:- 電壓 - 電源，模擬:3 V ~ 3.6 V 電壓 - 電源，數(shù)字:3 V ~ 3.6 V 封裝/外殼:32-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:32-QFN（5x5） 包裝:帶卷 (TR) |
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