參數(shù)資料
型號： THS4130EVM
廠商： Texas Instruments, Inc.
英文描述： HIGH SPEED LOW NOISE, FULLY DIFFERENTIAL I/O AMPLIFIERS
中文描述： 高速低噪音，完全不同的I / O功放
文件頁數(shù)： 17/27頁
文件大小： 569K
代理商： THS4130EVM
SLOS318E MAY 2000 REVISED JANUARY 2004
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Active antialias filtering
For signal conditioning in ADC applications, it is important to limit the input frequency to the ADC. Low-pass
filters can prevent the aliasing of the high frequency noise with the frequency of operation. The following figure
presents a method by which the noise may be filtered in the THS413x.
VIN
VIN+
+
+
VOCM
VOCM
VIN
VIN+
VCC
THS1050
THS413x
C3
C3
R4
R(t)
R2
R4
+
C1
+
VCC
C1
R2
R3
R3
C2
R1
R1
Vs
VIC
Figure 34. Antialias Filtering
The transfer function for this filter circuit is:
Hd(f)
K
–
f
FSF x fc
2
1
Q
jf
FSF x fc
1
x
Rt
2R4
j2
π
fR4RtC3
2R4
Rt
1
Rt
Where K
R2
R1
FSF x fc
1
2
π
2 x R2R3C1C2
and Q
2 x R2R3C1C2
R2C1
R3C1
KR3C1
K sets the pass band gain, fc is the cutoff frequency for the filter, FSF is a frequency scaling factor, and Q is the
quality factor.
FSF
Re
2
|Im|
2
and Q
Re
2
|Im|
2
2Re
where Re is the real part, and Im is the imaginary part of the complex pole pair. Setting R2 = R, R3 = mR,
C1 = C, and C2 = nC results in:
FSF x fc
1
2
π
RC 2 x mn
and Q
2 x mn
m(1
1
K)
Start by determining the ratios, m and n, required for the gain and Q of the filter type being designed, then select
C and calculate R for the desired fc.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4130ID 功能描述:差分放大器 Ln Diff. In/Out RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130ID 制造商:Texas Instruments 功能描述:IC AMP DIFF SMD 4130 SOIC8
THS4130IDG4 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130IDGK 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130IDGKG4 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
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