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參數(shù)資料
| 型號(hào)： | AFE1203E |
| 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)： | 9/10頁(yè) |
| 文件大小： | 193K |
| 代理商： | AFE1203E |
9
AFE1203
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).
PROGRAMMABLE POWER DISSIPATION
The power dissipation of the AFE1203 is digitally program-
mable by the user to three levels: Normal, Medium, and
Low. The maximum bit rate of the AFE1203 is 2.3Mbps
with Normal power dissipation. At lower power dissipation
levels, the maximum bit rate is lower and in addition, the
minimum bit rate is lower. The power control pin (pin 22)
has three input levels, Logic 1, Logic 0, and high impedance.
In the high impedance state, up to 20
μ
A leakage current can
be tolerated out of the power control pin. The AFE1203
requires six baud periods to settle after a change in the power
control pin status.
Typical power dissipation specifications, shown in Table I,
assume a 5V analog supply, a 3.3V digital supply, standard
13.5dBm delivered to the line, a pseudo random equiprob-
able sequence of HDSL output pulses, and a 1:2 turns ratio
line transformer. The power dissipation specifications in-
cludes all power dissipated in the AFE1203—it does not
include power dissipated in the external load. The external
power is 16.5dBm, 13.5dBm to the line and 13.5dBm to the
impedance matching resistors. The external power of
16.5dBm is 45mW. If a 5V digital supply is used rather than
a 3.3V supply, the power dissipation increases by approxi-
mately 3mW.
FIGURE 4. Uncancelled Echo Test Diagram.
TYPICAL
POWER
DISSIPATION
(mW)
MAXIMUM
SPEED
(Mbps)
MINIMUM
SPEED
(kbps)
POWER
LEVEL
PIN 22
INPUT
Normal
Medium
Low
2.320
1.168
0.320
384
192
160
385
300
240
Logic 1
Logic 0
High Impedance
TABLE I. Power Control Operation.
rxHYB
N
AFE1205
rxLINE
P
rxLINE
N
rxD13 - rxD0
rxHYB
P
txLINE
N
txLINE
P
txDAT
P
100pF
0.01
μ
F
576
1.54k
13
13
5.6
1:2
5.6
150
576
100pF
375
Transmit
Data
Uncancelled
Echo
375
135
S
1
A
F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AFE1205 | LJT 18C 18#20 PIN PLUG |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFE1203E/1K | 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 |
| AFE1203E/1KG4 | 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 |
| AFE1205 | 制造商:BB 制造商全稱:BB 功能描述:2Mbps, Single Pair HDSL ANALOG FRONT END |
| 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) |
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