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參數(shù)資料
| 型號： | OPA2365 |
| 英文描述： | 2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail OPERATIONAL AMPLIFIERS |
| 中文描述： | 2.2伏，50MHz的，低噪聲，單電源軌至軌運(yùn)算放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 301K |
| 代理商： | OPA2365 |
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SBOS365A JUNE 2006 REVISED JULY 2006
www.ti.com
11
One point to observe when considering the MFB filter
is that the output is inverted, relative to the input. If this
inversion is not required, or not desired, a noninverting
output can be achieved through one of these options:
1) adding an inverting amplifier; 2) adding an additional
2nd-order MFB stage; or 3) using a noninverting filter
topology such as the Sallen-Key (shown in Figure 9).
MFB and Sallen-Key, low-pass and high-pass filter syn-
thesis is quickly accomplished using TI’s FilterPro pro-
gram. This software is available as a free download at
www.ti.com.
DRIVING AN ANALOG-TO-DIGITAL CONVERTER
Very wide common-mode input range, rail-to-rail input
and output voltage capability and high speed make the
OPA365 an ideal driver for modern ADCs. Also, be-
cause it is free of the input offset transition characteris-
tics inherent to some rail-to-rail CMOS op amps, the
OPA365 provides low THD and excellent linearity
throughout the input voltage swing range.
Figure 10 shows the OPA365 driving an ADS8326,
16-bit, 500kSPS converter. The amplifier is connected
as a unity-gain, noninverting buffer and has an output
swing to 0V, making it directly compatible with the ADC
minus full-scale input level. The 0V level is achieved by
powering the OPA365 V pin with a small negative volt-
age established by the diode forward voltage drop.
A small, signal-switching diode or Schottky diode
provides a suitable negative supply voltage of 0.3 to
0.7V. The supply rail-to-rail is equal to V+, plus the
small negative voltage.
V
OUT
V
IN
= 1V
RMS
OPA365
R
3
150k
R
2
19.5k
C
220pF
R
1
1.8k
C
3.3nF
C
47pF
Figure 9. Configured as a 3-Pole, 20kHz, Sallen-Key Filter
5V
V
Optional
(2)
C
100nF
R
1(1)
100
R
2
500
C
100nF
V+
+5V
SD1
BAS40
V
IN
0 to 4.096V
ADS8326
16Bit
100kSPS
C
3(1)
1nF
C
100nF
+5V
REF IN
IN
+IN
REF3240
4.096V
+5V
OPA365
NOTES: (1) Suggested value; may require adjustment based on specific application.
(2) Singlesupply applications lose a small number of ADC codes near ground
due to op amp output swing limitation. If a negative power supply is available,
this simple circuit creates a
0.3V supply to allow output swing to true ground
potential.
Figure 10. Driving the ADS8326
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2365AID | 功能描述:運(yùn)算放大器 - 運(yùn)放 50MHz Single Supply Rail-to-Rail OP 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 |
| OPA2365AIDG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 50MHz Single Supply Rail-to-Rail OP 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 |
| OPA2365AIDR | 功能描述:運(yùn)算放大器 - 運(yùn)放 2.2V 50MHz Lo-Noise Sgl-Spy Rail-to-Rail 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 |
| OPA2365AIDRG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 2.2V 50MHz Lo-Noise Sgl-Spy Rail-to-Rail 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 |
| OPA2365AQDRQ1 | 功能描述:運(yùn)算放大器 - 運(yùn)放 2.2V,50MHz,Lo-Noise Sgl-Sply RR Op 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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