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參數(shù)資料
| 型號： | RHF-24(2) |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW-POWER DISSIPATION ADSL LINE DRIVER |
| 中文描述： | 低功耗ADSL線路驅(qū)動器 |
| 文件頁數(shù)： | 22/30頁 |
| 文件大小： | 1105K |
| 代理商： | RHF-24(2) |
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www.ti.com
PD
TMAX–TA
JA
θ
JC
= Thermal coefficient from junction to case. See the Package Dissipation Ratings table.
θ
CA
= Thermal coefficient from case to ambient determined by PCB layout and construction.
Where:
P
D
T
MAX
= Absolute maximum operating junction temperature (125
°
C)
T
A
= Free-ambient air temperature (
°
C)
θ
JA
=
θ
JC
+
θ
CA
= Maximum power dissipation of THS6182 (watts)
GENERAL CONFIGURATIONS
A common error for the first-time CFB user is to create a unity gain buffer amplifier by shorting the output directly
to the inverting input. A CFB amplifier in this configuration oscillates and is
not
recommended. The THS6182,
like all CFB amplifiers,
must
have a feedback resistor for stable operation. Additionally, placing capacitors
directly from the output to the inverting input is not recommended. This is because, at high frequencies, a
capacitor has a very low impedance. This results in an unstable amplifier and should not be considered when
using a current-feedback amplifier. Because of this, integrators and simple low-pass filters, which are easily
implemented on a VFB amplifier, have to be designed slightly differently. If filtering is required, simply place an
RC-filter at the noninverting terminal of the operational-amplifier (see Figure 75).
V
I
V
O
C1
+
R
G
R
F
R1
f–3dB
1
2 R1C1
VO
VI
1
RF
RG
1
sR1C1
1
THS6182
SLLS544G–SEPTEMBER 2002–REVISED NOVEMBER 2004
APPLICATION INFORMATION (continued)
More complete details of the PowerPAD installation process and thermal management techniques can be found
in the Texas Instruments Technical Brief,
PowerPAD Thermally Enhanced Package.
This document can be found
at the TI web site (www.ti.com) by searching on the key word PowerPAD. The document can also be ordered
through your local TI sales office. Refer to literature number
SLMA002
when ordering.
Figure 75. Single-Pole Low-Pass Filter
If a multiple pole filter is required, the use of a Sallen-Key filter can work very well with CFB amplifiers. This is
because the filtering elements are not in the negative feedback loop and stability is not compromised. Because of
their high slew-rates and high bandwidths, CFB amplifiers can create very accurate signals and help minimize
distortion. An example is shown in Figure 76.
22
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