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參數(shù)資料
| 型號： | AFE1104 |
| 英文描述： | LJT 12C 8#20 4#16 PIN PLUG |
| 中文描述： | HDSL / MDSL模擬前端 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 203K |
| 代理商： | AFE1104 |
AFE1104
9
RECEIVE TIMING
The rxSYNC signal controls portions of the A/D converter’s
decimation filter and the data output timing of the A/D
converter. It is generated at the symbol rate by the user and
must be synchronized with rxCLK. The bandwidth of the
A/D converter decimation filter is equal to one half of the
symbol rate. The A/D converter data output rate is 2X the
symbol rate. The specifications of the AFE1104 assume that
one A/D converter output is used per symbol period and the
other interpolated output is ignored. The Receive Timing
Diagram suggests using the rxSYNC pulse to read the first
data output in a symbol period. Either data output may be
used. Both data outputs may be used for more flexible post-
processing.
DISCUSSION OF
SPECIFICATIONS
UNCANCELED ECHO
The key measure of transceiver performance is uncanceled
echo. This measurement is made as shown in the diagram of
Figure 5 and the measurement is made as follows. The AFE
is connected to an output circuit including 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 uncanceled 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 uncanceled 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 uncanceled 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 5).
POWER DISSIPATION
Approximately 75% of the power dissipation in the AFE1104
is in the analog circuitry, and this component does not
change with clock frequency. However, the power dissipa-
tion in the digital circuitry does decrease with lower clock
frequency. In addition, the power dissipation in the digital
section is decreased when operating from a smaller supply
voltage, such as 3.3V. (The analog supply, AV
DD
, must
remain in the range 4.75V to 5.25V).
FIGURE 5. Uncanceled Echo Test Diagram.
rxHYB
N
AFE1104
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AFE1104E | HDSL/MDSL ANALOG FRONT END |
| AFE1105 | LJT 12C 8#20 4#16 SKT WALL REC |
| AFE1105E | 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 |
| AFE1115 | 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 |
| AFE1115E | 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AFE1104E | 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 |
| AFE1104E/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 |
| AFE1104E/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 |
| AFE1104EG4 | 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 |
| AFE1105 | 制造商:BB 制造商全稱:BB 功能描述:HDSL/MDSL ANALOG FRONT END |
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