參數(shù)資料
型號: ADXL50AH
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調(diào)理
英文描述: Monolithic Accelerometer With Signal Conditioning
中文描述: SPECIALTY ANALOG CIRCUIT, MBCY10
封裝: HERMETIC SEALED, METAL CAN, TO-100, 10 PIN
文件頁數(shù): 13/16頁
文件大小: 286K
代理商: ADXL50AH
ADXL50
REV. B
–13–
Figure 24. Circuit Providing Two Pole Post Filtering and 0 g Offset and Scale Factor Trimming
ONE POLE POST FILT E RING
Figure 23 shows the ADX L50 buffer amplifier connected to
provide one pole post filtering, 0 g offset trimming, and output
scaling. T he table included with the figure lists practical compo-
nent values for various full-scale g levels and approximate circuit
bandwidths. For bandwidths other than those listed, use the
formula:
Capacitor C4 in Farads =
1/(2
π
×
R
3
in Ohms
×
3
dB BW in Hertz)
or simply scale the value of capacitor C4 accordingly; i.e., for a
±
20 g application with a 50 Hz bandwidth, the value of C4 will
need to be twice as large as its 100 Hz value or 0.012
μ
F
×
2 =
0.024
μ
F. T he closest standard value of 0.022
μ
F should then
be used.
T WO POLE POST FILT E RING
Figure 24 shows a circuit which uses the ADX L50’s buffer am-
plifier to provide two pole post filtering. An AD820 external op
amp allows noninteractive adjustment of 0 g offset and scale
factor. Component values for the two pole filter were selected to
operate the buffer at unity gain with a Q of one.
Figure 23. Using the Buffer Amplifier to Provide One Pole Post Filtering Plus Scale Factor and 0 g Level Trimming
GAIN
10.53
5.26
2.63
2.11
FULL
SCALE
±
10 g
±
20 g
±
40 g
±
50 g
mV
per g
200
100
50
40
R4a
k
5
5
10
10
R4b
k
21.5
23.7
34
45.3
R5
k
249
137
105
105
OFFSET & SCALING AMPLIFIER
COMPONENT VALUES
3dB
BW(Hz)
300
100
30
10
C3
μ
F
0.027
0.082
0.27
0.82
C4
μ
F
0.0033
0.01
0.033
0.1
2 POLE FILTER
COMPONENT VALUES
BUFFER
AMP
ADXL50
PRE-AMP
0.022
μ
F
C1
C1
0.022
μ
F
C2
COM
0.1
μ
F
+5V
V
OUT
V
IN–
V
PR
VREF
R3
1.8V
C4
R5
42.2k
82.5k
2 POLE FILTER
R1
82.5k
R4a
R4b
SCALE
FACTOR
TRIM
2
6
+5V
0.01
μ
F
7
3
4
AD820
R5
OUTPUT
OPTIONAL CAPACITOR
FOR 3 POLE FILTERING
20k
40.2k
71.5k
R6
R7
0g
LEVEL
TRIM
10
6
8
9
1
4
2
3
5
C3
+3.4V
OFFSET AND
SCALING
AMPLIFIER
3dB BW =
1
2
π
R3 C4
RECOMMENDED COMPONENT VALUES FOR VARIOUS
FULL SCALE RANGES AND A 300Hz BANDWIDTH
FULL
SCALE
±
10 g
±
20 g
±
40 g
±
50 g
mV
per g
200
100
50
40
3dB
BW (Hz)
300
300
300
300
R1a
k
5
5
10
10
R1b
k
21.5
23.7
34
45.3
R3
k
249
137
105
105
R2
k
100
100
100
100
C4
μ
F
0.0022
0.0039
0.0056
0.0056
*
TO OMIT THE OPTIONAL SCALE FACTOR TRIM,
REPLACE R1a AND R1b WITH A FIXED VALUE 1%
METAL FILM RESISTOR. SEE VALUES SPECIFIED
IN TABLE II.
BUFFER
AMP
ADXL50
PRE-AMP
0.022
μ
F
C1
C1
0.022
μ
F
C2
COM
0.1
μ
F
+5V
V
OUT
V
IN–
V
PR
REF
+3.4V
50k
R1b
R2
R3
0g
LEVEL
TRIM
1.8V
C4
R1a
OPTIONAL SCALE
FACTOR TRIM
*
2
3
4
1
5
6
9
8
10
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