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參數資料
| 型號： | AD8544 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | General Purpose CMOS Rail-to-Rail Amplifiers(通用滿幅度四放大器) |
| 中文描述： | 通用CMOS軌到軌放大器（通用滿幅度四放大器） |
| 文件頁數： | 10/12頁 |
| 文件大小： | 148K |
| 代理商： | AD8544 |
AD8541/AD8542/AD8544
–10–
REV. 0
accomplish in the FNDR circuit. For example, the Twin-T
Notch uses three capacitors with two unique values, whereas the
FNDR circuit uses only two capacitors, which may be of the
same value. U3 is simply a buffer that is added to lower the out-
put impedance of the circuit.
4
f
=
R
2
C2
L
=
C2
1
m
F
1/4 AD8544
11
6
1/4 AD8544
14
U4
1/4 AD8544
8
U3
10
9
C1
1
m
F
1
2
π
LC1
R
2.61k
V
R1
Q ADJUST
200
V
V
OUT
2.5V
REF
2
1
3
1/4 AD8544
R
2.61k
V
12
13
NC
2.5V
REF
SPARE
5
7
R
2.61k
V
R
2.61k
V
2.5V
REF
U2
U1
Figure 33. FNDR 60 Hz Notch Filter with Output Buffer
Comparator Function
A comparator function is a common application for a spare op
amp in a quad package. Figure 34 illustrates 1/4 of the AD8544
as a comparator in a standard overload detection application.
Unlike so many op amps, the AD854x family can double as
comparator because this op amp family has rail-to-rail differen-
tial input range, rail-to-rail output, and a great speed vs. power
ratio. R2 is used to introduce hysteresis. The AD854x when
used as comparators have 5
μ
s propagation delay @ 5 V and 5
μ
s
overload recovery time.
R1
1k
V
V
OUT
2.5V
REF
V
IN
1/4 AD8544
2.5V
DC
R2
1M
V
Figure 34. The AD854x Comparator Application–Overload
Detector
Photodiode Application
The AD854x family has very high impedance with input bias
current typically around 4 pA. This characteristic allows the
AD854x op amps to be used in photodiode applications and
other applications that require high input impedance. Note that
the AD854x has significant voltage offset, which can be removed
by capacitive coupling or software calibration.
Figure 35, illustrates a photodiode or current measurement
application. The feedback resistor is limited to 10 M
to avoid
excessive output offset. Also note that a resistor is not needed
on the noninverting input to cancel bias current offset, because
the bias current related output offset is not significant when
compared to the voltage offset contribution. For the best per-
formance follow the standard high impedance layout techniques
including: shield circuit, clean circuit board, put a trace con-
nected to the noninverting input around the inverting input,
and use separate analog and digital power supplies.
AD8541
4
6
7
3
2
V
OUT
2.5V
REF
R
10M
V
C
100pF
D
2.5V
REF
OR
V+
Figure 35. High Input Impedance Application–Photodiode
Amplifier
相關PDF資料 |
PDF描述 |
|---|---|
| AD8542AR | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8542ARM | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8542ARU | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8544AR | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8544ARU | General Purpose CMOS Rail-to-Rail Amplifiers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8544AR | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 5.5V 14-Pin SOIC N 制造商:Analog Devices 功能描述:2.5V to 6V 4 1MHz IyAv 14SOIC Bulk 制造商:Analog Devices 功能描述:AMP QUAD LOW POWER RRI/O SMD 8544 |
| AD8544AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 5.5V 14-Pin SOIC N T/R |
| AD8544AR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 5.5V 14-Pin SOIC N T/R 制造商:Analog Devices 功能描述:IC OP-AMP QUAD R/R |
| AD8544ARU | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 5.5V 14-Pin TSSOP 制造商:Analog Devices 功能描述:IC OP-AMP QUAD R/R |
| AD8544ARU-REEL | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R I/O 5.5V 14-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:QUAD, LOW PWR RAIL/RAIL OP AMP - Tape and Reel 制造商:Analog Devices 功能描述:IC OP-AMP QUAD R/R |
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