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| 型號(hào)： | AD22050 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single-Supply Sensor Interface Amplifier |
| 中文描述： | 單電源傳感器接口放大器 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 148K |
| 代理商： | AD22050 |
AD22050
–5–
REV. C
AD22050
–IN GND
+IN OFS +V
S
OUT
A1
A2
V
DM
V
CM
ANALOG
OUTPUT
ANALOG
COMMON
CORNER FREQUENCY =
1
2
p
C
3
100k
THAT IS, 1.59Hz-
m
F
(C IS IN FARADS)
C
Figure 6. Connections for Single-Pole, Low-Pass Filter
If the gain is raised using a resistor, as shown in Figure 5, the
corner frequency is lowered by the same factor as the gain is
raised. Thus, using a resistor of 200 k
(for which the gain
would be doubled) the corner frequency is now 0.796 Hz-
μ
F,
(0.039
μ
F for a 20 Hz corner).
AD22050
+IN OFS +V
S
OUT
–IN GND A1
A2
V
DM
V
CM
ANALOG
OUTPUT
ANALOG
COMMON
CORNER
FREQUENCY = 1Hz-
m
F
C
C
255k
V
Figure 7. Connections for Conveniently Scaled, Two-Pole,
Low-Pass Filter
A two-pole filter (with a roll-off of 40 dB/decade) can be imple-
mented using the connections shown in Figure 7. This is a
Sallen & Key form based on a
×
2 amplifier. It is useful to remem-
ber that a two-pole filter with a corner frequency f
2
and a
one-pole filter with a corner at f
1
have the same attenuation at
the frequency (f
22
/f
1
)
.
The attenuation at that frequency is
40 Log(f
2
/f
1
). This is illustrated in Figure 8. Using the standard
resistor value shown, and equal capacitors (in Figure 7), the
corner frequency is conveniently scaled at 1 Hz-
μ
F (0.05
μ
F for
a 20 Hz corner). A maximally flat response occurs when the
resistor is lowered to 196 k
and the scaling is then 1.145 Hz-
μ
F. The output offset is raised by about 4 mV (equivalent to
200
μ
V at the input pins).
ATTENUATION
f
1
f
2
40LOG (f
2
/f
1
)
FREQUENCY
–20dB/DECADE
–40dB/DECADE
(f
22
/f
1
)
A 1-POLE FILTER, CORNER f
,
AND A 2-POLE FILTER, CORNER f
2
,
HAVE THE SAME ATTENUATION,
–40LOG (f
2
/f
1
), AT FREQUENCY f
22
/f
1
Figure 8. Comparative Responses of One- and Two-Pole
Low-Pass Filters
A three-pole filter (with roll-off 60 dB/decade) can be formed by
adding a passive RC network at the output forming a real pole.
A three-pole filter with a corner frequency f
3
has the same
attenuation a one-pole filter of corner f
1
has at a frequency
√
f
33
/f
1
, where the attenuation is 30 Log (f
3
/f
1
) (see the graph in
Figure 9). Using equal capacitor values, and a resistor of
160 k
, the corner-frequency calibration remains 1 Hz-
μ
F.
ATTENUATION
f
1
f
3
30LOG (f
3
/f
1
)
FREQUENCY
–20dB/DECADE
–60dB/DECADE
(f
33
/f
1
)
–30LOG (f
3
/f
1
), AT FREQUENCY (f
33
/f
1)
A 1-POLE FILTER, CORNER f
,
AND A 3-POLE FILTER, CORNER f
3
,
HAVE THE SAME ATTENUATION,
Figure 9. Comparative Responses of One- and Three-Pole
Low-Pass Filters
CURRENT SENSOR INTERFACE
A typical automotive application making use of the large
common-mode range is shown in Figure 10.
AD22050
–IN GND A1
+IN OFS +V
S
OUT
A2
100m
V
SOLENOID
LOAD
POWER
DARLINGTON
CMOS DRIVER
+V
S
(BATTERY)
CHASSIS
C
191k
V
20k
V
+5V
ANALOG OUTPUT
4V PER AMP
5% SENSOR
CALIBRATION
CORNER FREQUENCY
= 0.796Hz-
F
(0.22
m
F FOR f = 3.6Hz)
ANALOG COMMON
FLYBACK
DIODE
Figure 10. Current Sensor Interface. Gain Is
×
40, Single-
Pole Low-Pass Filtering
The current in a load, here shown as a solenoid, is controlled by
a power transistor that is either cut off or saturated by a pulse at
its base; the duty-cycle of the pulse determines the average
current. This current is sensed in a small resistor. The aver-
age differential voltage across this resistor is typically 100 mV,
although its peak value will be higher by an amount that
depends on the inductance of the load and the control fre-
quency. The common-mode voltage, on the other hand, extends
from roughly 1 V above ground, when the transistor is satu-
rated, to about 1.5 V above the battery voltage, when the tran-
sistor is cut off and the diode conducts.
If the maximum battery voltage spikes up to +20V, the common-
mode voltage at the input can be as high as 21.5 V. This can be
measured using even a +5 V supply for the AD22050.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD22050N | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 36V 8-Pin PDIP Tube 制造商:Rochester Electronics LLC 功能描述:I.C. SENSOR INTERFACE IC - Bulk 制造商:Analog Devices 功能描述:SEMICONDUCTORS ((NW)) 制造商:Analog Devices 功能描述:Single-Supply Sensor Interface Amplifier 制造商:Analog Devices Inc. 功能描述:Single-Supply Sensor Interface Amplifier |
| AD22050NZ | 功能描述:IC AMP DIFF SGL SUPPLY 8-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD22050R | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 36V 8-Pin SOIC N Tube 制造商:Rochester Electronics LLC 功能描述:SENSOR INTERFACE IC - Bulk |
| AD22050R-REEL | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 36V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:IC SENSOR IC - Tape and Reel |
| AD22050R-REEL7 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single 36V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:IC SENSOR IC - Tape and Reel |
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