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參數資料
| 型號： | AD8541AR-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | General Purpose CMOS Rail-to-Rail Amplifiers |
| 中文描述： | OP-AMP, 7000 uV OFFSET-MAX, 0.98 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 10/16頁 |
| 文件大小： | 237K |
| 代理商： | AD8541AR-REEL7 |
AD8541/AD8542/AD8544
–10–
REV. D
much easier and/or less expensive to 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 output impedance of the circuit.
4
f
=
R
2
C2
L
=
C2
1 F
1/4 AD8544
11
6
1/4 AD8544
14
U4
1/4 AD8544
8
U3
10
9
C1
1 F
1
2
p
LC1
R
2.61k
R1
Q ADJUST
200
V
OUT
2.5V
REF
2
1
3
1/4 AD8544
R
2.61k
12
13
NC
2.5V
REF
SPARE
5
7
R
2.61k
R
2.61k
2.5V
REF
U2
U1
Figure 3. 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 4 illustrates 1/4 of the AD8544
as a comparator in a standard overload detection application.
Unlike many op amps, the AD854x family can double as
comparators because this op amp family has rail-to-rail differential
input range, rail-to-rail output, and a great speed versus power
ratio. R2 is used to introduce hysteresis. The AD854x, when
used as comparators, have 5
m
s propagation delay at 5 V and 5
m
s
overload recovery time.
R1
1k
V
OUT
2.5V
REF
V
IN
1/4 AD8544
2.5V
DC
R2
1M
Figure 4. 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 5 illustrates a photodiode or current measurement
application. The feedback resistor is limited to 10 M
W
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
performance follow the standard high impedance layout
techniques including:
∑
Shield the circuit.
∑
Clean the circuit board.
∑
Put a trace connected to the noninverting input around the
inverting input.
∑
Use separate analog and digital power supplies.
AD8541
4
6
7
3
2
V
OUT
2.5V
REF
R
10M
C
100pF
D
2.5V
REF
OR
V+
Figure 5. High Input Impedance Application–Photodiode
Amplifier
相關PDF資料 |
PDF描述 |
|---|---|
| AD8541ART-REEL7 | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8542AR-REEL7 | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8542ARUZ | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8542ARZ | General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8544ARZ | General Purpose CMOS Rail-to-Rail Amplifiers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8541ART | 制造商:AD 制造商全稱:Analog Devices 功能描述:General Purpose CMOS Rail-to-Rail Amplifiers |
| AD8541ART-R2 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 5.5V 5-Pin SOT-23 T/R 制造商:Analog Devices 功能描述:IC OP-AMP SINGLE R/R |
| AD8541ART-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 5.5V 5-Pin SOT-23 T/R |
| AD8541ART-REEL7 | 功能描述:IC OPAMP GP R-R CMOS SOT23-5 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:1 輸出類型:滿擺幅 轉換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SO 包裝:帶卷 (TR) |
| AD8541ARTZ | 制造商:Analog Devices 功能描述:AMP RAIL-RAIL SMD SOT-23-5 8541 制造商:Analog Devices 功能描述:AMP, RAIL-RAIL, SMD, SOT-23-5, 8541 |
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