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參數(shù)資料
| 型號(hào)： | AD22057R-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF SNGL-SUP 8SOIC T/R |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 傳感器接口 |
| 輸入類型： | 電壓 |
| 輸出類型： | 模擬 |
| 接口： | 差分 |
| 電流 - 電源： | 200µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
AD22057
–5–
REV. A
frequency will increase; it should be calculated using the parallel
sum of the resistor and 100 k
.
AD22057
+IN OFS +VS OUT
–IN GND
A1
A2
VDM
VCM
ANALOG
OUTPUT
ANALOG
COMMON
CORNER FREQUENCY =
1
2 C
100k
THAT IS, 1.59Hz- 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-
F,
(0.039
F for a 20 Hz corner).
AD22057
+IN OFS +VS OUT
–IN GND A1
A2
VDM
VCM
ANALOG
OUTPUT
ANALOG
COMMON
CORNER
FREQUENCY = 1Hz- F
C
255k
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 f2 and a
one-pole filter with a corner at f1 have the same attenuation at
the frequency (f2
2/f
1). The attenuation at that frequency is
40 Log(f2/f1). 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-
F (0.05 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-
F. The output offset is raised by about 4 mV (equivalent to
200
V at the input pins).
ATTENUATION
f1
f2
40LOG (f2/f1)
FREQUENCY
–20dB/DECADE
–40dB/DECADE
(f22/f1)
A 1-POLE FILTER, CORNER f1,
AND A 2-POLE FILTER, CORNER f2,
HAVE THE SAME ATTENUATION,
–40LOG (f2/f1), AT FREQUENCY f22/f1
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 f3 has the same
attenuation a one-pole filter of corner f1 has at a frequency
√f
3
3/f
1, where the attenuation is 30 Log (f3/f1) (see the graph in
Figure 9). Using equal capacitor values, and a resistor of
160 k
, the corner-frequency calibration remains 1 Hz-F.
ATTENUATION
f1
f3
30LOG (f3/f1)
FREQUENCY
–20dB/DECADE
–60dB/DECADE
(f3
3/f
1)
–30LOG (f3/f1), AT FREQUENCY
(f33/f1)
A 1-POLE FILTER, CORNER f1,
AND A 3-POLE FILTER, CORNER f3,
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.
AD22057
+IN OFS +VS OUT
–IN GND A1
A2
100m
SOLENOID
LOAD
POWER
DARLINGTON
CMOS DRIVER
+VS (BATTERY)
CHASSIS
C
191k
20k
+5V
ANALOG OUTPUT
4V PER AMP
5% SENSOR
CALIBRATION
CORNER FREQUENCY
= 0.796Hz- F
(0.22 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 +20 V, 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 AD22057.
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