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| 型号： | TLC2652MP |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | Advanced LinCMOSE PRECISION CHOPPER-STABILIZED OPERATIONAL AMPLIFIERS |
| 中文描述： | 高级LinCMOSE精密斩波稳定运算放大器 |
| 文件页数： | 23/31页 |
| 文件大小： | 474K |
| 代理商： | TLC2652MP |
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TLC2652, TLC2652A, TLC2652Y
Advanced LinCMOS
PRECISION CHOPPER-STABILIZED
OPERATIONAL AMPLIFIERS
SLOS019C – SEPTEMBER 1988 – REVISED FEBRUARY 1999
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
latch-up avoidance
Because CMOS devices are susceptible to latch-up due to their inherent parasitic thyristors, the TLC2652 inputs
and output are designed to withstand –100-mA surge currents without sustaining latch-up; however, techniques
to reduce the chance of latch-up should be used whenever possible. Internal protection diodes should not, by
design, be forward biased. Applied input and output voltages should not exceed the supply voltage by more than
300 mV. Care should be exercised when using capacitive coupling on pulse generators. Supply transients
should be shunted by the use of decoupling capacitors (0.1
μ
F typical) located across the supply rails as close
to the device as possible.
The current path established if latch-up occurs is usually between the supply rails and is limited only by the
impedance of the power supply and the forward resistance of the parasitic thyristor. The chance of latch-up
occurring increases with increasing temperature and supply voltage.
electrostatic discharge protection
The TLC2652 incorporates internal ESD-protection circuits that prevent functional failures at voltages at or
below 2000 V. Care should be exercised in handling these devices, as exposure to ESD may result in
degradation of the device parametric performance.
theory of operation
Chopper-stabilized operational amplifiers offer the best dc performance of any monolithic operational amplifier.
This superior performance is the result of using two operational amplifiers, a main amplifier and a nulling
amplifier, plus oscillator-controlled logic and two external capacitors to create a system that behaves as a single
amplifier. With this approach, the TLC2652 achieves submicrovolt input offset voltage, submicrovolt noise
voltage, and offset voltage variations with temperature in the nV/
°
C range.
The TLC2652 on-chip control logic produces two dominant clock phases: a nulling phase and an amplifying
phase. The term chopper-stabilized derives from the process of switching between these two clock phases.
Figure 34 shows a simplified block diagram of the TLC2652. Switches A and B are make-before-break types.
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
Amplifier
IN+
IN–
Main Amplifier
VO
VDD–
CXA
CXB
B
A
B
A
+
–
+
–
Figure 34. TLC2652 Simplified Block Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| TLC2652Y | Advanced LinCMOSE PRECISION CHOPPER-STABILIZED OPERATIONAL AMPLIFIERS |
| TLC2652I-14D | Advanced LinCMOSE PRECISION CHOPPER-STABILIZED OPERATIONAL AMPLIFIERS |
| TLC32047IFN | Wide-Band Analog Interface Circuit |
| TLC32047C | Wide-Band Analog Interface Circuit |
| TLC32047I | Wide-Band Analog Interface Circuit |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TLC2652Q-8D | 功能描述:运算放大器 - 运放 Precision Chopper RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLC2652Q-8DG4 | 功能描述:运算放大器 - 运放 Precision Chopper Stabilized OP AMP RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLC26541-8D | 制造商:Texas Instruments 功能描述: |
| TLC2654AC-8D | 功能描述:运算放大器 - 运放 Adv. Ln Chopper RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLC2654AC-8DG4 | 功能描述:运算放大器 - 运放 LinCMOS LoNose Chopr Stabilized OP AMP RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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