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OPA4344PA 参数 Datasheet PDF下载

OPA4344PA图片预览
型号: OPA4344PA
PDF下载: 下载PDF文件 查看货源
内容描述: 低功耗,单电源轨至轨运算放大器MicroAmplifier ⑩系列 [LOW POWER, SINGLE-SUPPLY, RAIL-TO-RAIL OPERATIONAL AMPLIFIERS MicroAmplifier ⑩ Series]
分类和应用: 运算放大器放大器电路光电二极管
文件页数/大小: 11 页 / 245 K
品牌: BB [ BURR-BROWN CORPORATION ]
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OPERATING VOLTAGE  
APPLICATIONS INFORMATION  
OPA344 and OPA345 series op amps are fully specified and  
guaranteed from +2.7V to +5.5V. In addition, many specifi-  
cations apply from –40ºC to +85ºC. Parameters that vary  
significantly with operating voltages or temperature are  
shown in the Typical Performance Curves.  
OPA344 series op amps are unity gain stable and can operate  
on a single supply, making them highly versatile and easy to  
use. OPA345 series op amps are optimized for applications  
requiring higher speeds with gains of 5 or greater.  
Rail-to-rail input and output swing significantly increases  
dynamic range, especially in low supply applications. Figure  
1 shows the input and output waveforms for the OPA344 in  
unity-gain configuration. Operation is from VS = +5V with  
a 10kload connected to VS/2. The input is a 5Vp-p  
sinusoid. Output voltage is approximately 4.997Vp-p.  
RAIL-TO-RAIL INPUT  
The input common-mode voltage range of the OPA344 and  
OPA345 series extends 300mV beyond the supply rails.  
This is achieved with a complementary input stage—an N-  
channel input differential pair in parallel with a P-channel  
differential pair (see Figure 2). The N-channel pair is active  
for input voltages close to the positive rail, typically (V+) –  
1.3V to 300mV above the positive supply, while the P-  
channel pair is on for inputs from 300mV below the negative  
supply to approximately (V+) –1.3V. There is a small  
transition region, typically (V+) – 1.5V to (V+) – 1.1V, in  
which both pairs are on. This 400mV transition region can  
vary 300mV with process variation. Thus, the transition  
region (both stages on) can range from (V+) – 1.8V to (V+)  
– 1.4V on the low end, up to (V+) – 1.2V to (V+) – 0.8V on  
the high end. Within the 400mV transition region PSRR,  
CMRR, offset voltage, offset drift, and THD may be de-  
graded compared to operation outside this region. For more  
information on designing with rail-to-rail input op amps, see  
Figure 3 “Design Optimization with Rail-to-Rail Input Op  
Amps.”  
Power supply pins should be by passed with 0.01pF ceramic  
capacitors.  
G = +1, VS = +5V  
Input  
5V  
0V  
Output (inverted on scope)  
5µs/div  
FIGURE 1. Rail-to-Rail Input and Output.  
V+  
Reference  
Current  
VIN  
+
VIN  
VBIAS1  
Class AB  
Control  
VO  
Circuitry  
VBIAS2  
V–  
(Ground)  
FIGURE 2. Simplified Schematic.  
®
OPA344, 2344, 4344  
OPA345, 2345, 4345  
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