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參數(shù)資料
| 型號(hào)： | AD8515 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1.8 V Low Power CMOS Rail-to-Rail Input/Output Operational Amplifier |
| 中文描述： | 1.8 V低功耗CMOS軌到軌輸入/輸出運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 242K |
| 代理商： | AD8515 |
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REV. B
AD8515
–12–
Full Power Bandwidth
The slew rate of an amplifier determines the maximum frequency
at which it can respond to a large input signal. This frequency
(known as full power bandwidth,
FPBW
) can be calculated
from the equation
FPBW
SR
PEAK
￥
=
2
p
for a given distortion. The
FPBW
of AD8515 is shown in Figure 3
to be close to 200 kHz.
TIME (2 s/DIV)
0
0
0
0
0
0
V
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V
IN
V
OUT
Figure 3. Full Power Bandwidth
A MICROPOWER REFERENCE VOLTAGE GENERATOR
Many single-supply circuits are configured with the circuit biased
to one-half of the supply voltage. In these cases, a false ground
reference can be created by using a voltage divider buffered by
an amplifier. Figure 4 shows the schematic for such a circuit. The
two 1 M
W
resistors generate the reference voltages while drawing
only 0.9
m
A of current from a 1.8 V supply. A capacitor connected
from the inverting terminal to the output of the op amp provides
compensation to allow for a bypass capacitor to be connected at
the reference output. This bypass capacitor helps establish an ac
ground for the reference output.
0.9V TO 2.5V
AD8515
1
3
2
C2
0.022 F
R4
100
C1
1 F
V–
V+
1.8V TO 5V
U1
R2
1M
C3
1 F
R1
1M
R3
10k
Figure 4. Micropower Voltage Reference Generator
A 100 kHz Single-Supply Second Order Band-Pass Filter
The circuit in Figure 5 is commonly used in portable applications
where low power consumption and wide bandwidth are required.
This figure shows a circuit for a single-supply band-pass filter
with a center frequency of 100 kHz. It is essential that the op
amp has a loop gain at 100 kHz in order to maintain an accurate
center frequency. This loop gain requirement necessitates the
choice of an op amp with a high unity gain crossover frequency,
such as the AD8515. The 4.5 MHz bandwidth of the AD8515
is sufficient to accurately produce the 100 kHz center frequency,
as the response in Figure 6 shows. When the op amp’s bandwidth
is close to the filter’s center frequency, the amplifier’s internal
phase shift causes excess phase shift at 100 kHz, which alters
the filter’s response. In fact, if the chosen op amp has a bandwidth
close to 100 kHz, the phase shift of the op amps will cause the
loop to oscillate.
A common-mode bias level is easily created by connecting the
noninverting input to a resistor divider consisting of two resistors
connected between VCC and ground. This bias point is also
decoupled to ground with a 1
m
F capacitor.
f
R
C
f
R
2
1
C
H
R
R
VCC
V
V
L
H
=
￥
￥
=
￥
￥
= +
=
-
1
2
1
1
1
2
1
1
1
1 8
.
5
0
p
p
where:
f
L
is the low –3 db frequency.
f
H
is the high –3 db frequency.
H
0
is the midfrequency gain.
VOUT
AD8515
1
3
4
C6
10pF
V–
V+
VCC
U9
R6
1M
R8
1M
R2
20k
R5
2k
R1
5k
C1
2nF
V11
400mV
VCC
C3
1 F
0
0
Figure 5. Second Order Band-Pass Filter
FREQUENCY (Hz)
2
01k
100M
10k
O
100k
1M
10M
1
Figure 6. Frequency Response of the Band-Pass Filter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8515AKS | 1.8 V Low Power CMOS Rail-to-Rail Input/Output Operational Amplifier |
| AD8515ART | 1.8 V Low Power CMOS Rail-to-Rail Input/Output Operational Amplifier |
| AD8517 | 7 MHz Rail-to-Rail Low Voltage Operational Amplifiers |
| AD8517ART-REEL | 7 MHz Rail-to-Rail Low Voltage Operational Amplifiers |
| AD8527 | 7 MHz Rail-to-Rail Low Voltage Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8515_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.8 V Low Power CMOS Rail-to-Rail Input/Output Operational Amplifier |
| AD8515AKS | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.8 V Low Power CMOS Rail-to-Rail Input/Output Operational Amplifier |
| AD8515AKS-R2 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 5V 5-Pin SC-70 T/R |
| AD8515AKS-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 5V 5-Pin SC-70 T/R |
| AD8515AKS-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 5V 5-Pin SC-70 T/R |
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