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ALD1712_10 参数 Datasheet PDF下载

ALD1712_10图片预览
型号: ALD1712_10
PDF下载: 下载PDF文件 查看货源
内容描述: 轨到轨精密运算放大器 [RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER]
分类和应用: 运算放大器
文件页数/大小: 9 页 / 85 K
品牌: ALD [ ADVANCED LINEAR DEVICES ]
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Design & Operating Notes:  
1. TheALD1712A/ALD1712B/ALD1712CMOSoperationalamplifieruses  
a 3 gain stage architecture and an improved frequency compensation  
scheme to achieve large voltage gain, high output driving capability,  
and better frequency stability. In a conventional CMOS operational  
amplifierdesign, compensationisachievedwithapolesplittingcapaci-  
tor together with a nulling resistor. This method is, however, very bias  
dependent and thus cannot accommodate the large range of supply  
voltage operation as is required from a stand alone CMOS operational  
amplifier. The ALD1712A/ALD1712B/ALD1712 is internally compen-  
sated for unity gain stability using a novel scheme that does not use a  
nulling resistor. This scheme produces a clean single pole roll off in the  
gain characteristics while providing for more than 70 degrees of phase  
margin at the unity gain frequency. A unity gain buffer using the  
ALD1712A/ALD1712B/ALD1712 will typically drive 400pF of external  
load capacitance without stability problems. In the inverting unity gain  
configuration, it can drive up to 800pF of load capacitance. Compared  
to other CMOS operational amplifiers, the ALD1712A/ALD1712B/  
ALD1712 has shown itself to be more resistant to parasitic oscillations.  
however, be aware that this switching does take place if the operational  
amplifier is connected as a unity gain buffer and should make provision  
in his design to allow for input offset voltage variations.  
3. The input bias and offset currents are essentially input protection diode  
reverse bias leakage currents, and are typically less than 1pA at room  
temperature. This low input bias current assures that the analog signal  
from the source will not be distorted by input bias currents. Normally,  
this extremely high input impedance of greater than 1012would not be  
a problem as the source impedance would limit the node impedance.  
However, for applications where source impedance is very high, it may  
be necessary to limit noise and hum pickup through proper shielding.  
4. The output stage consists of class AB complementary output drivers,  
capable of driving a low resistance load. The output voltage swing is  
limited by the drain to source on-resistance of the output transistors as  
determined by the bias circuitry, and the value of the load resistor.  
When connected in the voltage follower configuration, the oscillation  
resistant feature, combined with the rail to rail input and output feature,  
makes an effective analog signal buffer for medium to high source  
impedance sensors, transducers, and other circuit networks.  
2. The ALD1712A/ALD1712B/ALD1712 has complementary p-channel  
and n-channel input differential stages connected in parallel to accom-  
plishrailtorailinputcommonmodevoltagerange. Thismeansthatwith  
the ranges of common mode input voltage close to the power supplies,  
one of the two differential stages is switched off internally. To maintain  
compatibility with other operational amplifiers, this switching point has  
been selected to be about 1.5V above the negative supply voltage.  
Since offset voltage trimming on the ALD1712A/ALD1712B/ALD1712  
is made when the input voltage is symmetrical to the supply voltages,  
this internal switching does not affect a large variety of applications  
such as an inverting amplifier or non-inverting amplifier with a gain  
larger than 2.5 (5V operation), where the common mode voltage does  
not make excursions below this switching point. The user should  
5. The ALD1712A/ALD1712B/ALD1712 operational amplifier has been  
designed to provide full static discharge protection. Internally, the  
design has been carefully implemented to minimize latch up. However,  
care must be exercised when handling the device to avoid strong static  
fields that may degrade a diode junction, causing increased input  
leakage currents. In using the operational amplifier, the user is advised  
topowerupthecircuitbefore,orsimultaneouslywith,anyinputvoltages  
applied and to limit input voltages to not exceed 0.3V of the power  
supply voltage levels.  
TYPICAL PERFORMANCE CHARACTERISTICS  
COMMON MODE INPUT VOLTAGE RANGE  
AS A FUNCTION OF SUPPLY VOLTAGE  
OPEN LOOP VOLTAGE GAIN AS A FUNCTION  
OF SUPPLY VOLTAGE AND TEMPERATURE  
1000  
±7  
±6  
}
-55°C  
T
A
= 25°C  
±5  
±4  
}
+25°C  
100  
}
+125°C  
±3  
±2  
±1  
0
10  
1
R = 10K  
L
R = 5KΩ  
L
0
±1  
±2  
±3  
±4  
±5  
±6  
±7  
0
±2  
±4  
SUPPLY VOLTAGE (V)  
±6  
±8  
SUPPLY VOLTAGE (V)  
INPUT BIAS CURRENT AS A FUNCTION  
OF AMBIENT TEMPERATURE  
SUPPLY CURRENT AS A FUNCTION  
OF SUPPLY VOLTAGE  
±5  
±4  
1000  
100  
INPUTS GROUNDED  
OUTPUT UNLOADED  
V
= ±2.5V  
S
10  
±3  
±2  
±1  
0
T
A
= -55ºC  
-25°C  
1.0  
+25°C  
+80°C  
+125°C  
0.1  
0.01  
-50 -25  
0
25  
50  
75  
100  
125  
0
±1  
±2  
±3  
±4  
±5  
±6  
AMBIENT TEMPERATURE (°C)  
SUPPLY VOLTAGE (V)  
ALD1712A/ALD1712B  
ALD1712  
Advanced Linear Devices  
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