参数资料
| 型号： | THS6182DWEVM |
| 厂商： | Texas Instruments |
| 文件页数： | 18/26页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR THS6182DW |
| 标准包装： | 1 |
| 主要目的： | 接口，线路驱动器，ADSL |
| 已用 IC / 零件： | THS6182DW |
| 已供物品： | 板 |
| 产品目录页面： | 904 (CN2011-ZH PDF) |
| 相关产品： | THS6182DWG4-ND - IC ADSL LINE DRVR LP 20-SOIC THS6182DG4-ND - IC ADSL LINE DRVR LP 16-SOIC THS6182RHFTG4-ND - IC ADSL LINE DRIVER LP 24-QFN THS6182RHFT-ND - IC ADSL LINE DRIVER LP 24-QFN THS6182RHFRG4-ND - IC ADSL LINE DRIVER LP 24-QFN THS6182DWRG4-ND - IC ADSL LINE DRIVER LP 20-SOIC THS6182DWR-ND - IC ADSL LINE DRIVER LP 20-SOIC THS6182DWPRG4-ND - IC ADSL LINE DRIVER LP 20-SOIC THS6182DWPR-ND - IC ADSL LINE DRIVER LP 20-SOIC THS6182DWPG4-ND - IC ADSL LINE DRIVER LP 20-SOIC 更多... |
| 其它名称： | 296-18856 |
Active Termination
Active feedback creates larger impedance (Z) than what is actually placed
there by series resistors R S :
S
1– F
P
Z(W) +
R
R
R
(2)
The important thing to consider is that regardless of the forward gain from Vin
to Vo, the active impedance (Z) value remains constant.
Solving equation 2 for Rp, the following equation is produced:
R +
F
1 * S
P
R
R
P
(3)
Using Z = 50 ? and values from Figure 3?2 in equation 3, yields 1995 ? for
R P . The closest E96(1%) value to 1995 ? is 2 k ? , as shown in Figure 3?2.
Now that the return impedance is corrected, forward voltage gain from input
to output is calculated. Equation 3 shows the simplified forward gain from Vin
to Vo.
A + O
1 *
F
P
G
L
R ) R
V V
V
in
"
"
+
1 )
R
R
F
P
R
R || R
R
L
S
if R
L
tt R
P
(4)
where
R +
LINE
L
R
2 n 2
(5)
With a transformer ratio( n ) of 1 and a R LINE of 100 ? , R L is 50 ? .
When the value R L and the values in Figure 3?2 are used in equation 4, the
resulting voltage gain is 14.5. Because R G does not affect the value of the
apparent output impedance of the circuit, voltage gain can be adjusted by
changing R G .
The reader is cautioned that active termination is a very complex topic, with
many considerations. Please carefully read the Texas Instruments Application
Report Active Output Impedance for ADSL Line Drivers , (SLOA100) to gain
a more complete understanding of the topic and all the subtle implications of
active termination.
R1 and C1 are located on the EVM so that a snubber circuit may be
implemented. Some transformers have a high resonant frequency (as low as
25 MHz but as high as 150 MHz). When using traditional termination (just R6,
and R15—no active termination), there is typically not a reason to use these
components. But, when active termination is used, the effective impedance of
these two resistor values drops substantially. Thus, there can be very small
3-4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS6182DWG4 | 功能描述:缓冲器和线路驱动器 Low Pwr Dissipation Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| THS6182DWP | 功能描述:缓冲器和线路驱动器 Low Pwr Dissipation Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| THS6182DWPG4 | 功能描述:缓冲器和线路驱动器 Low Pwr Dissipation Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| THS6182DWPR | 功能描述:缓冲器和线路驱动器 Low Pwr Dissipation Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| THS6182DWPRG4 | 功能描述:缓冲器和线路驱动器 Low Pwr Dissipation Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
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