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參數(shù)資料
| 型號： | OPA4228UA2K5 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High Precision, Low Noise OPERATIONAL AMPLIFIERS |
| 中文描述： | 高精度，低噪聲運(yùn)算放大器 |
| 文件頁數(shù)： | 14/27頁 |
| 文件大小： | 847K |
| 代理商： | OPA4228UA2K5 |
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OPA227, 2227, 4227
OPA228, 2228, 4228
14
SBOS110A
www.ti.com
Figure 6 shows the 0.1Hz 10Hz bandpass filter used to test
the noise of the OPA227 and OPA228. The filter circuit was
designed using Texas Instruments’ FilterPro software (avail-
able at www.ti.com). Figure 7 shows the configuration of
the OPA227 and OPA228 for noise testing.
FIGURE 6. 0.1Hz to 10Hz Bandpass Filter Used to Test Wideband Noise of the OPA227 and OPA228 Series.
FIGURE 7. Noise Test Circuit.
USING THE OPA228 IN LOW GAINS
The OPA228 family is intended for applications with signal
gains of 5 or greater, but it is possible to take advantage of
their high speed in lower gains. Without external compen-
sation, the OPA228 has sufficient phase margin to maintain
stability in unity gain with purely resistive loads. However,
the addition of load capacitance can reduce the phase
margin and destabilize the op amp.
A variety of compensation techniques have been evaluated
specifically for use with the OPA228. The recommended
configuration consists of an additional capacitor (C
F
) in
parallel with the feedback resistance, as shown in Figures
8 and 11. This feedback capacitor serves two purposes in
compensating the circuit. The op amp’s input capacitance
and the feedback resistors interact to cause phase shift that
can result in instability. C
F
compensates the input capaci-
tance, minimizing peaking. Additionally, at high frequen-
cies, the closed-loop gain of the amplifier is strongly
influenced by the ratio of the input capacitance and the
feedback capacitor. Thus, C
F
can be selected to yield good
stability while maintaining high speed.
R
4
9.09k
R
3
1k
R
7
97.6k
R
6
40.2k
C
2
1
μ
F
C
1
1
μ
F
C
3
0.47
μ
F
C
4
22nF
R
2
2M
R
8
402k
R
5
634k
Input from
Device
Under
Test
R
1
2M
(OPA227)
U1
(OPA227)
U2
6
2
3
R
10
226k
R
9
178k
C
5
0.47
μ
F
C
10nF
R
11
178k
(OPA227)
U3
6
V
OUT
2
3
100k
V
OUT
6
2
3
OPA227
22pF
10
Device
Under
Test
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4228UAE4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 High Prec Low Noise Oper Amplifier RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA4234 | 制造商:BB 制造商全稱:BB 功能描述:Low-Power, Precision SINGLE-SUPPLY OPERATIONAL AMPLIFIERS |
| OPA4234P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OPA4234PA | 制造商:BB 制造商全稱:BB 功能描述:Low Power, Precision SINGLE-SUPPLY OPERATIONAL AMPLIFIERS |
| OPA4234U | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Power Prec Sngl-Sply Oper Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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