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參數(shù)資料
| 型號(hào)： | AFE1205 |
| 英文描述： | LJT 18C 18#20 PIN PLUG |
| 中文描述： | 2Mbps的，單對(duì)HDSL模擬前端 |
| 文件頁(yè)數(shù)： | 10/10頁(yè) |
| 文件大小： | 196K |
| 代理商： | AFE1205 |
10
AFE1205
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 AFE1205: the digital section, the phase-
locked loop, and the analog section. A combined analog and
digital ground plane is recommended. The ground plane
should pass under all of the AFE1205 and its pins.
The power supply for the digital section of the AFE1205 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 ground
plane should run up to and underneath the digital pins of the
AFE1205 (pins 3 through 26). However, DV
DD
may be
supplied by a wide printed circuit board (PCB) trace. A
ground plane underneath all digital pins is strongly recom-
mended.
The Phase Locked Loop (PLL) analog supply, pin 2, must be
derived from AV
DD
, the general analog supply. The power
supply to the PLL must be in the range of 4.75V to 5.25V.
The PLL section of the AFE1205 should be decoupled with
both a 10
μ
F tantalum capacitor and a 0.1
μ
F ceramic capaci-
tor. Both capacitors should be placed between pins 1 and 2.
The ceramic capacitor should be placed as close to the
AFE1205 as possible. The placement of the tantalum capaci-
tor is not as critical, but should be close. A 5
to 10
resistor should be used to connect the PLL supply (pin 2) to
the analog supply. This resistor, in combination with the
10
μ
F tantalum capacitor, form a low pass filter to keep
glitches that occur on the general analog supply, AV
DD
,
from affecting the PLL supply. The PLL ground (pin 1)
should connect directly to the grond plane.
The remaining portion of the AFE1205 should be considered
analog. All AGND pins should be connected directly to a
common analog ground plane and all AV
DD
pins should be
connected to an analog 5V power plane. Both of these planes
should have a low impedance path to the power supply.
Ideally, all ground planes and traces and all power planes
and traces should return to the power supply connector
before being connected together (if necessary). Each ground
and power pair should be routed over each other, should not
overlap any portion of another pair, and the pairs should be
separated by a distance of at least 0.25 inch (6mm). One
exception is that the digital and analog ground planes should
be connected together underneath the AFE1205 by a small
trace.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AFE1205E | Circular Connector; No. of Contacts:18; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:15-18 RoHS Compliant: No |
| AFE1224 | 2Mbps, Single Pair ANALOG FRONT END |
| AFE1224E | Circular Connector; No. of Contacts:18; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-18 RoHS Compliant: No |
| AFE1230 | G.SHDSL ANALOG FRONT-END |
| AFE1230E | G.SHDSL ANALOG FRONT-END |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFE1205E | 功能描述:電信線路管理 IC 2Mbps Sngl Pair HDSL Anlg 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 |
| AFE1205E/1K | 功能描述:IC HDSL ANALOG FRONT END 48SSOP 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) |
| AFE1205E-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AFE1205EG4 | 功能描述:電信線路管理 IC 2Mbps Sngl Pair HDSL Anlg 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 |
| AFE1224 | 制造商:BB 制造商全稱:BB 功能描述:2Mbps, Single Pair ANALOG FRONT END |
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