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| 型號： | TLC27X |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FAMILY OF 500-UA/CH 3-MHZ RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS |
| 中文描述： | 3系列的500-UA/CH MHz的軌到軌輸出運(yùn)算放大器 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大小： | 514K |
| 代理商： | TLC27X |
μ
SGLS275 OCTOBER 2004
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
offset voltage
The output offset voltage (V
OO
) is the sum of the input offset voltage (V
IO
) and both input bias currents (I
IB
) times
the corresponding gains. The following schematic and formula can be used to calculate the output offset
voltage:
VOO
VIO
1
RF
RG
IIB
RS
1
RF
RG
IIB–RF
+
VI
+
RG
RS
RF
IIB
VO
IIB+
Figure 26. Output Offset Voltage Model
general configurations
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often
required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier
(see Figure 27).
VI
VO
C1
+
RG
RF
R1
f–3dB
1
2 R1C1
VO
VI
1
RF
RG
1
sR1C1
1
VDD/2
Figure 27. Single-Pole Low-Pass Filter
If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this
task. For the best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency
bandwidth. Failure to do this can result in phase shift of the amplifier.
VI
C2
R2
R1
C1
RF
RG
R1 = R2 = R
C1 = C2 = C
Q = Peaking Factor
(Butterworth Q = 0.707)
(
=
1
Q
2
)
RG
RF
_
+
f–3dB
1
2 RC
VDD/2
Figure 28. 2-Pole Low-Pass Sallen-Key Filter
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