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| 型號(hào)： | AD22057R-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Single-Supply Sensor Interface Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 1000 uV OFFSET-MAX, 0.03 MHz BAND WIDTH, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 192K |
| 代理商： | AD22057R-REEL |
AD22057
–5–
REV. A
frequency will increase; it should be calculated using the parallel
sum of the resistor and 100 k
.
AD22057
–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
V
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. T hus, 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).
AD22057
–IN GND A1
+IN OFS +V
S
OUT
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. T his is a
Sallen & K ey 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
)
.
T he attenuation at that frequency is
40 Log(f
2
/f
1
). T his 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. T he 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
CURRE NT SE NSOR INT E RFACE
A typical automotive application making use of the large
common-mode range is shown in Figure 10.
AD22057
–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
T he 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. T his current is sensed in a small resistor. T he 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. T he 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. T his can be
measured using even a +5 V supply for the AD22057.
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