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參數(shù)資料
| 型號(hào)： | AD8628 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Low Noise Operational Amplifier |
| 中文描述： | 零漂移，單電源，軌到軌輸入/輸出低噪聲運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 16/20頁(yè) |
| 文件大小： | 476K |
| 代理商： | AD8628 |
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AD8628/AD8629
INPUT OVERVOLTAGE PROTECTION
Although the AD8628/AD8629 are rail-to-rail input amplifiers,
care should be taken to ensure that the potential difference
between the inputs does not exceed the supply voltage. Under
normal negative feedback operating conditions, the amplifier
corrects its output to ensure that the two inputs are at the same
voltage. However, if either input exceeds either supply rail by
more than 0.3 V, large currents begin to flow through the ESD
protection diodes in the amplifier.
Rev. C | Page 16 of 20
These diodes are connected between the inputs and each supply
rail to protect the input transistors against an electrostatic
discharge event and are normally reverse-biased. However, if the
input voltage exceeds the supply voltage, these ESD diodes can
become forward-biased. Without current limiting, excessive
amounts of current could flow through these diodes, causing
permanent damage to the device. If inputs are subject to
overvoltage, appropriate series resistors should be inserted to
limit the diode current to less than 5 mA maximum.
OUTPUT PHASE REVERSAL
Output phase reversal occurs in some amplifiers when the input
common-mode voltage range is exceeded. As common-mode
voltage is moved outside of the common-mode range, the
outputs of these amplifiers can suddenly jump in the opposite
direction to the supply rail. This is the result of the differential
input pair shutting down, causing a radical shifting of internal
voltages that results in the erratic output behavior.
The AD8628/AD8629 amplifiers have been carefully designed
to prevent any output phase reversal, provided that both inputs
are maintained within the supply voltages. If one or both inputs
could exceed either supply voltage, a resistor should be placed in
series with the input to limit the current to less than 5 mA. This
ensures that the output does not reverse its phase.
OVERLOAD RECOVERY TIME
Many auto-zero amplifiers are plagued by a long overload
recovery time, often in ms, due to the complicated settling
behavior of the internal nulling loops after saturation of the
outputs. The AD8628/AD8629 have been designed so that
internal settling occurs within two clock cycles after output
saturation happens. This results in a much shorter recovery
time, less than 10 μs, when compared to other auto-zero
amplifiers. The wide bandwidth of the AD8628/AD8629
enhances performance when they are used to drive loads that
inject transients into the outputs. This is a common situation
when an amplifier is used to drive the input of switched
capacitor ADCs.
TIME (500
μ
s/DIV)
V
V
OUT
0V
0V
V
IN
0
CH1 = 50mV/DIV
CH2 = 1V/DIV
A
V
= –50
Figure 56. Positive Input Overload Recovery for the AD8628
TIME (500
μ
s/DIV)
V
V
OUT
0V
0V
V
IN
0
CH1 = 50mV/DIV
CH2 = 1V/DIV
A
V
= –50
Figure 57. Positive Input Overload Recovery for LTC2050
TIME (500
μ
s/DIV)
V
V
OUT
0V
0V
V
IN
0
CH1 = 50mV/DIV
CH2 = 1V/DIV
A
V
= –50
Figure 58. Positive Input Overload Recovery for LMC2001
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8629ARZ1 | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
| AD8628AUJZ-REEL | ER 2C 2#16S PIN PLUG |
| AD8628AUJZ-REEL7 | Circular Connector; No. of Contacts:2; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:10SL; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:10SL-4 RoHS Compliant: No |
| AD8628ARTZ-REEL7 | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
| AD8629ARMZ-REEL | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8628_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
| AD8628_08 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
| AD8628AR | 制造商:Analog Devices 功能描述:SP Amp Chopper Stabilization Single R-R I/O ±2.5V/5V 8-Pin SOIC N Tube 制造商:Analog Devices 功能描述:IC SM OP-AMP Z-DRIFT RRI/O |
| AD8628AR-REEL | 制造商:Analog Devices 功能描述:SP Amp Chopper Stabilization Single R-R I/O ±2.5V/5V 8-Pin SOIC N T/R |
| AD8628AR-REEL7 | 制造商:Analog Devices 功能描述:SP Amp Chopper Stabilization Single R-R I/O ±2.5V/5V 8-Pin SOIC N T/R |
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