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AD8032ARMZ-REEL7 参数 Datasheet PDF下载

AD8032ARMZ-REEL7图片预览
型号: AD8032ARMZ-REEL7
PDF下载: 下载PDF文件 查看货源
内容描述: 2.7 V , 800レA, 80 MHz轨到轨输入/输出放大器 [2.7 V, 800 レA, 80 MHz Rail-to-Rail I/O Amplifiers]
分类和应用: 放大器光电二极管
文件页数/大小: 20 页 / 434 K
品牌: ADI [ ADI ]
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AD8031/AD8032  
APPLICATIONS  
A 2 MHz SINGLE-SUPPLY, BIQUAD BAND-PASS  
FILTER  
0
–10  
–20  
–30  
Figure 47 shows a circuit for a single-supply, biquad band-pass  
filter with a center frequency of 2 MHz. A 2.5 V bias level is  
easily created by connecting the noninverting inputs of all three  
op amps to a resistor divider consisting of two 1 kΩ resistors  
connected between 5 V and ground. This bias point is also  
decoupled to ground with a 0.1 μF capacitor. The frequency  
response of the filter is shown in Figure 48.  
To maintain an accurate center frequency, it is essential that the  
op amp have sufficient loop gain at 2 MHz. This requires the  
choice of an op amp with a significantly higher unity gain,  
crossover frequency. The unity gain, crossover frequency of the  
AD8031/AD8032 is 40 MHz. Multiplying the open-loop gain by  
the feedback factors of the individual op amp circuits yields the  
loop gain for each gain stage. From the feedback networks of  
the individual op amp circuits, it can be seen that each op amp  
has a loop gain of at least 21 dB. This level is high enough to  
ensure that the center frequency of the filter is not affected by  
the op amp’s bandwidth. If, for example, an op amp with a gain  
bandwidth product of 10 MHz was chosen in this application,  
the resulting center frequency would shift by 20% to 1.6 MHz.  
–40  
–50  
10k  
100k  
1M  
10M  
100M  
FREQUENCY (Hz)  
Figure 48. Frequency Response of 2 MHz Band-Pass Filter  
HIGH PERFORMANCE, SINGLE-SUPPLY LINE DRIVER  
Even though the AD8031/AD8032 swing close to both rails, the  
AD8031 has optimum distortion performance when the signal  
has a common-mode level half way between the supplies and  
when there is about 500 mV of headroom to each rail. If low  
distortion is required in single-supply applications for signals  
that swing close to ground, an emitter-follower circuit can be  
used at the op amp output.  
R6  
1k  
C1  
50pF  
5V  
10µF  
R2  
2kΩ  
R4  
2kΩ  
5V  
0.1µF  
5V  
0.1µF  
C2  
50pF  
R1  
3kΩ  
0.1µF  
7
3
V
R3  
2kΩ  
IN  
V
6
IN  
2N3904  
R5  
2kΩ  
49.9Ω  
2
1kΩ  
AD8031  
4
AD8031  
1/2  
AD8032  
49.9Ω  
200Ω  
1/2  
AD8032  
2.49kΩ  
2.49kΩ  
V
OUT  
49.9Ω  
0.1µF  
1kΩ  
V
OUT  
Figure 49. Low Distortion Line Driver for Single-Supply, Ground Referenced Signals  
Figure 47. A 2 MHz, Biquad Band-Pass Filter Using AD8031/AD8032  
Figure 49 shows the AD8031 configured as a single-supply, gain-  
of-2 line driver. With the output driving a back-terminated  
50 ꢀ line, the overall gain from VIN to VOUT is unity. In addition  
to minimizing reflections, the 50 ꢀ back termination resistor  
protects the transistor from damage if the cable is short circuited.  
The emitter follower, which is inside the feedback loop, ensures  
that the output voltage from the AD8031 stays about 700 mV  
above ground. Using this circuit, low distortion is attainable  
even when the output signal swings to within 50 mV of ground.  
The circuit was tested at 500 kHz and 2 MHz.  
Rev. C | Page 16 of 20