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參數(shù)資料
| 型號： | TLC2654AQ8D |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Advanced LinCMOSE LOW-NOISE CHOPPER-STABILIZED OPERATIONAL AMPLIFIERS |
| 中文描述： | 高級LinCMOSE低噪聲斬波穩(wěn)定運(yùn)算放大器 |
| 文件頁數(shù)： | 22/30頁 |
| 文件大?。?/td> | 443K |
| 代理商： | TLC2654AQ8D |
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TLC2654, TLC2654A
Advanced LinCMOS
LOW-NOISE CHOPPER-STABILIZED
OPERATIONAL AMPLIFIERS
SLOS020F – NOVEMBER 1988 – REVISED JULY 1999
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
theory of operation (continued)
During the nulling phase, switch A is closed, shorting the nulling amplifier inputs together and allowing the nulling
amplifier to reduce its own input offset voltage by feeding its output signal back to an inverting input node.
Simultaneously, external capacitor C
XA
stores the nulling potential to allow the offset voltage of the amplifier to
remain nulled during the amplifying phase.
Null
+
IN+
IN–
Main
VDD–
CXA
CXB
B
A
B
A
+
–
–
5
4
10
OUT
7
Pin numbers shown are for the D (14 pin), J, and N packages.
Figure 35. TLC2654 Simplified Block Diagram
During the amplifying phase, switch B is closed, connecting the output of the nulling amplifier to a noninverting
input of the main amplifier. In this configuration, the input offset voltage of the main amplifier is nulled. Also,
external capacitor C
XB
stores the nulling potential to allow the offset voltage of the main amplifier to remain
nulled during the next nulling phase.
This continuous chopping process allows offset voltage nulling during variations in time and temperature and
over the common-mode input voltage range and power supply range. In addition, because the low-frequency
signal path is through both the null and main amplifiers, extremely high gain is achieved.
The low-frequency noise of a chopper amplifier depends on the magnitude of the component noise prior to
chopping and the capability of the circuit to reduce this noise while chopping. The use of the Advanced LinCMOS
process, with its low-noise analog MOS transistors and patent-pending input stage design, significantly reduces
the input noise voltage.
The primary source of nonideal operation in chopper-stabilized amplifiers is error charge from the switches. As
charge imbalance accumulates on critical nodes, input offset voltage can increase especially with increasing
chopping frequency. This problem has been significantly reduced in the TLC2654 by use of a patent-pending
compensation circuit and the Advanced LinCMOS process.
The TLC2654 incorporates a feed-forward design that ensures continuous frequency response. Essentially, the
gain magnitude of the nulling amplifier and compensation network crosses unity at the break frequency of the
main amplifier. As a result, the high-frequency response of the system is the same as the frequency response
of the main amplifier. This approach also ensures that the slewing characteristics remain the same during both
the nulling and amplifying phases.
The primary limitation on ac performance is the chopping frequency. As the input signal frequency approaches
the chopper’s clock frequency, intermodulation (or aliasing) errors result from the mixing of these frequencies.
To avoid these error signals, the input frequency must be less than half the clock frequency. Most choppers
available today limit the internal chopping frequency to less than 500 Hz in order to eliminate errors due to the
charge imbalancing phenomenon mentioned previously. However, to avoid intermodulation errors on a 500-Hz
chopper, the input signal frequency must be limited to less than 250 Hz.
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| TLC2654AQ-8D | 功能描述:運(yùn)算放大器 - 運(yùn)放 Adv Ln Chopper 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 |
| TLC2654AQ-8DG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 LinCMOS LoNose Chopr Stabilized 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 |
| TLC2654C14DR | 制造商:Texas Instruments 功能描述: |
| TLC2654C-14DR | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low-Noise Chopper-Stabilized 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 |
| TLC2654C-14DRG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low-Noise Chopper-Stabilized 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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