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參數資料
| 型號： | OP777AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision Micropower Single Supply Operational Amplifier |
| 中文描述： | OP-AMP, 200 uV OFFSET-MAX, 0.7 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 11/12頁 |
| 文件大?。?/td> | 162K |
| 代理商： | OP777AR |
OP777
–11–
REV. 0
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
has a protection circuit against phase reversal when one or both
inputs are forced beyond their input common 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 45. 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 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
V
OUT
= 1mV
Figure 46. Follower Circuit
TIME
–
10 s/DIV
V
–
1.0mV
Figure 47. Rail-to-Rail Operation
Output Short Circuit
The output of the OP777 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
and limiting device power dissipation is of prime importance in
these designs. Figure 48 shows an example of 5 V, single supply
current monitor that can be incorporated into the design of a voltage
regulator with foldback current limiting or a high current power
supply with crowbar protection. The design capitalizes on the
OP777’s common-mode range that extends to ground. Current
is monitored in the power supply return where a 0.1
shunt
resistor, R
SENSE
, creates a very small voltage drop. The voltage at the
inverting terminal becomes equal to the voltage at the noninverting
terminal through the feedback of Q1, which is a 2N2222 or equiva-
lent NPN transistor. This makes the voltage drop across R1 equal to
the voltage drop across R
SENSE
. Therefore, the current through Q1
becomes directly proportional to the current through R
SENSE
, and
the output voltage is given by:
V
V
R
R
R
I
OUT
SENSE
L
=
×
×
5
2
1
The voltage drop across
R
2 increases with
I
L
increasing, so
V
OUT
,
decreases with higher supply current being sensed. For the element
values shown, the V
OUT
transfer characteristic is –2.5 V/A, decreas-
ing from V
EE
.
5V
2.49k
OP777
5V
100
V
OUT
Q1
RETURN TO
GROUND
0.1
R
SENSE
Figure 48. A Low-Side Load Current Monitor
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| OP777 | Precision Micropower Single Supply Operational Amplifier |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OP777ARM | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Micropower Single-Supply Operational Amplifiers |
| OP777ARM-R2 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R O/P ±15V/30V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE PRECISION RAIL-RAIL OP AMP - Bulk |
| OP777ARM-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R O/P ±15V/30V 8-Pin MSOP T/R |
| OP777ARMZ | 功能描述:IC OPAMP GP R-R 700KHZ 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產品培訓模塊:Differential Circuit Design Techniques for Communication Applications 標準包裝:1 系列:- 放大器類型:RF/IF 差分 電路數:1 輸出類型:差分 轉換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應商設備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| OP777ARMZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R O/P ±15V/30V 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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