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參數(shù)資料
| 型號(hào)： | 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)： | 13/16頁 |
| 文件大小： | 301K |
| 代理商： | OPA2365 |
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SBOS365A JUNE 2006 REVISED JULY 2006
www.ti.com
13
Figure 12 illustrates the OPA2365 dual op amp provid-
ing signal conditioning within an ADS1258 bridge sen-
sor circuit. It follows the ADS1258 16:1 multiplexer and
is connected as a differential in/differential out amplifier.
The voltage gain for this stage is approximately 10V/V.
Driving the ADS1258 internal ADC in differential mode,
rather than in a single-ended, exploits the full linearity
performance capability of the converter. For best com-
mon-mode rejection the two R
2
resistors should be
closely matched.
Note that in Figure 12, the amplifiers, bridges,
ADS1258 and internal reference are powered by the
same single +5V supply. This ratiometric connection
helps cancel excitation voltage drift effects and noise.
For best performance, the +5V supply should be as free
as possible of noise and transients.
When the ADS1258 data rate is set to maximum and
the chop feature enabled, this circuit yields 12 bits of
noise-free resolution with a 50mV full-scale input.
The chop feature is used to reduce the ADS1258 offset
and offset drift to very low levels. A 2.2nF capacitor is
required across the ADC inputs to bypass the sampling
currents. The 47
resistors provide isolation for the
OPA2365 outputs from the relatively large, 2.2nF ca-
pacitive load. For more information regarding the
ADS1258, see the product data sheet available for
down load at www.ti.com.
2k
R
3
47
R
2
= 10k
R
2
= 10k
ADS1258
2.2nF
+5V
+5V
R
3
47
AIN0
AINCOM
M
M
A
A
2k
AIN1
…
2k
AIN14
2k
AIN15
REFP
REFN
AVSS
AVDD
R
1
= 2.2k
10
μ
F
+
0.1
μ
F
0.1
μ
F
0.1
μ
F
+
10
μ
F
OPA2365
OPA2365
RFI
RFI
…
RFI
RFI
RFI
RFI
NOTE: G = 1 + 2R
2
/R
1
. Match R
2
resistors for optimum CMRR.
…
Figure 12. Conditioning Input Signals to the ADS1258 on a Single-Supply
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| 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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