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ALD1701G 参数 Datasheet PDF下载

ALD1701G图片预览
型号: ALD1701G
PDF下载: 下载PDF文件 查看货源
内容描述: 微功耗轨到轨CMOS运算放大器 [MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER]
分类和应用: 运算放大器
文件页数/大小: 6 页 / 49 K
品牌: ALD [ ADVANCED LINEAR DEVICES ]
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Design & Operating Notes:  
1. The ALD1701 CMOS operational amplifier uses 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 amplifier  
design, compensation is achieved with a pole splitting capacitor  
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 opera-  
tional amplifier. The ALD1701 is internally compensated 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.  
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. TheoutputstageconsistsofclassABcomplementaryoutputdrivers,  
capable of driving a low resistance load. The output voltage swing  
is limited by the drain to source on-resistance of the output transis-  
tors 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 ALD1701 has complementary p-channel and n-channel input  
differentialstagesconnectedinparalleltoaccomplishrailtorailinput  
common mode voltage range. This means that with the ranges of  
common mode input voltage close to the power supplies, one of the  
two differential stages is switched off internally. To maintain compa-  
tibility with other operational amplifiers, this switching point has been  
selected to be about 1.5V below the positive supply voltage. Since  
offset voltage trimming on the ALD1701 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 excur-  
sions above this switching point. The user should 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.  
5. TheALD1701operationalamplifierhasbeendesignedtoprovidefull  
static discharge protection. Internally, the design has been carefully  
implementedtominimizelatchup. However, caremustbeexercised  
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 to power up the  
circuit before, or simultaneously with any input voltages applied, and  
to limit input voltages not to exceed 0.3V of the power supply voltage  
levels.  
6. The ALD1701, with its micropower operation, offers numerous  
benefits in reduced power supply requirements, less noise coupling  
and current spikes, less thermally induced drift, better overall reli-  
ability due to lower self heating, and lower input bias current. It  
requires practically no warm up time as the chip junction heats up to  
only 0.1°C above ambient temperature under most operating condi-  
tions.  
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  
TYPICAL PERFORMANCE CHARACTERISTICS  
COMMON MODE INPUT VOLTAGE RANGE  
AS A FUNCTION OF SUPPLY VOLTAGE  
SUPPLY CURRENT AS A FUNCTION  
OF SUPPLY VOLTAGE  
±7  
±6  
±500  
+25°C  
INPUTS GROUNDED  
OUTPUT UNLOADED  
-25°C  
±400  
±300  
±200  
±100  
0
T
= 25°C  
A
±5  
±4  
T
= -55°C  
A
±3  
±2  
±1  
0
+70°C  
+125°C  
0
±1  
±2  
±3  
±4  
±5  
±6  
±7  
0
±1  
±2  
±3  
±4  
±5  
±6  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
OPEN LOOP VOLTAGE GAIN AS A  
FUNCTION OF LOAD RESISTANCE  
INPUT BIAS CURRENT AS A FUNCTION  
OF AMBIENT TEMPERATURE  
1000  
100  
10  
10000  
1000  
V
= ±2.5V  
S
100  
10  
1.0  
0.1  
V
T
= ±2.5V  
= 25°C  
S
A
1
10K  
100K  
1M  
10M  
-50 -25  
0
25  
50  
75  
100  
125  
LOAD RESISTANCE ()  
AMBIENT TEMPERATURE (°C)  
ALD1701A/ALD1701B  
ALD1701/ALD1701G  
Advanced Linear Devices  
4