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參數(shù)資料
| 型號(hào)： | OP727 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Precision Micropower Single-Supply Operational Amplifiers |
| 中文描述： | 精密微功耗單電源運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 194K |
| 代理商： | OP727 |
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REV. C
OP777/OP727/OP747
–
11
–
Input Over Voltage Protection
When the input of an amplifier is more than a diode drop below
V
EE
, or above V
CC
, large currents will flow from the substrate
(V–) or the positive supply (V+), respectively, to the input pins
which can destroy the device. In the case of OP777/OP727/
OP747, differential voltages equal to the supply voltage will not
cause any problem (see Figure 3). OP777/OP727/OP747 has
built-in 500
internal current limiting resistors, in series with the
inputs, to minimize the chances of damage. It is a good practice to
keep the current flowing into the inputs below 5 mA. In this con-
text it should also be noted that the high breakdown of the input
transistors removes the necessity for clamp diodes between the
inputs of the amplifier, a feature that is mandatory on many preci-
sion op amps. Unfortunately, such clamp diodes greatly interfere
with many application circuits such as precision rectifiers and
comparators. The OP777/OP727/OP747 series is free from such
limitations.
30V
V p-p = 32V
OP777/
OP727/
OP747
Figure 3a. Unity Gain Follower
TIME
–
400 s/DIV
V
–
V
SY
= 15V
V
IN
V
OUT
Figure 3b. Input Voltage Can Exceed the Supply Voltage
Without Damage
Phase Reversal
Many amplifiers misbehave when one or both of the inputs are
forced beyond the input common-mode voltage range. Phase
reversal is typified by the transfer function of the amplifier effectively
reversing its transfer polarity. In some cases this can cause lockup in
servo systems and may cause permanent damage or nonrecoverable
parameter shifts to the amplifier. Many amplifiers feature compensa-
tion circuitry to combat these effects, but some are only effective for
the inverting input. Additionally, many of these schemes only work
for a few hundred millivolts or so beyond the supply rails. OP777/
OP727/OP747 has a protection circuit against phase reversal
when one or both inputs are forced beyond their input common-
mode voltage range. It is not recommended that the parts be
continuously driven more than 3 V beyond the rails.
TIME
–
400 s/DIV
V
–
V
SY
= 15V
V
IN
V
OUT
Figure 4. No Phase Reversal
Output Stage
The CMOS output stage has excellent (and fairly symmetric) output
drive and with light loads can actually swing to within 1 mV of both
supply rails. This is considerably better than similar amplifiers
featuring (so-called) rail-to-rail bipolar output stages. OP777/
OP727/OP747 is stable in the voltage follower configuration and
responds to signals as low as 1 mV above ground in single supply
operation.
2.7V TO 30V
V
IN
= 1mV
OP777/
OP727/
OP747
V
OUT
= 1mV
Figure 5. Follower Circuit
TIME
–
10 s/DIV
V
–
1.0mV
Figure 6. Rail-to-Rail Operation
Output Short Circuit
The output of the OP777/OP727/OP747 series amplifier is protected
from damage against accidental shorts to either supply voltage,
provided that the maximum die temperature is not exceeded on a
long-term basis (see Absolute Maximum Rating section). Current of
up to 30 mA does not cause any damage.
A Low-Side Current Monitor
In the design of power supply control circuits, a great deal of design
effort is focused on ensuring a pass transistor’s long-term reliability
over a wide range of load current conditions. As a result, monitoring
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OP747 | 1K I2C™ Serial EEPROM, -40C to +85C, 8-TSSOP, TUBE |
| OP727AR | Precision Micropower Single-Supply Operational Amplifiers |
| OP727ARU | Precision Micropower Single-Supply Operational Amplifiers |
| OP747AR | Precision Micropower Single-Supply Operational Amplifiers |
| OP747ARU | Precision Micropower Single-Supply Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP727AR | 功能描述:IC OPAMP GP R-R 700KHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| OP727AR-REEL | 功能描述:IC OPAMP GP R-R 700KHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| OP727AR-REEL7 | 功能描述:IC OPAMP GP R-R 700KHZ 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| OP727AR-REEL7-DASSAULT | 制造商:Analog Devices 功能描述: |
| OP727ARU | 制造商:Analog Devices 功能描述:IC OP-AMP R/R |
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