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參數(shù)資料
| 型號： | AD704TQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | MB 8C 8#20 PIN PLUG |
| 中文描述： | QUAD OP-AMP, 150 uV OFFSET-MAX, 0.8 MHz BAND WIDTH, CDIP14 |
| 封裝： | CERDIP-14 |
| 文件頁數(shù)： | 8/8頁 |
| 文件大小： | 397K |
| 代理商： | AD704TQ |
AD704
REV. A
–8–
C
P
14-Pin Cerdip (Q) Package
16-Pin Plastic SO (R) Package
14-Pin Plastic DIP (N) Package
20-Terminal LCCC (E) Package
0.358 (9.09)
0.342 (8.69)
NO. 1 PIN
INDEX
0.040 (1.02)
x 45
°
REF
3 PLCS
0.020 (0.51)
x 45
°
REF
0.050
(1.27)
BSC
0.100 (2.54)
0.064 (1.63)
0.028 (0.71)
0.022 (0.56)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Table II. 1 Hz, 4-Pole Low-Pass Filter Recommended Component Values
Section 1
Frequency
(Hz)
Section 2
Frequency
(Hz)
Desired Low
Pass Response
C1
(
m
F)
C2
(
m
F)
C3
(
m
F)
C4
(
m
F)
Q
Q
Bessel
Butterworth
0.1 dB Chebychev
0.2 dB Chebychev
0.5 dB Chebychev
1.0 dB Chebychev
1.43
1.00
0.648
0.603
0.540
0.492
0.522
0.541
0.619
0.646
0.705
0.785
1.60
1.00
0.948
0.941
0.932
0.925
0.806
1.31
2.18
2.44
2.94
3.56
0.116
0.172
0.304
0.341
0.416
0.508
0.107
0.147
0.198
0.204
0.209
0.206
0.160
0.416
0.733
0.823
1.00
1.23
0.0616
0.0609
0.0385
0.0347
0.0290
0.0242
Specified Values are for a –3 dB point of 1.0 Hz. For other frequencies simply scale capacitors C1 through C4 directly; i.e., for 3 Hz Bessel response, C1 = 0.0387
μ
F,
C2 = 0.0357
μ
F, C3 = 0.0533
μ
F, C4 = 0.0205
μ
F.
The 1 Hz, 4-pole active filter offers dc precision with a mini-
mum of components and cost. The low current noise, I
OS
, and
I
B
allow the use of 1 M
resistors without sacrificing the
1
μ
V/
°
C drift of the AD704. This means lower capacitor values
may be used, reducing cost and space. Furthermore, since the
AD704’s I
B
is as low as its I
OS
, over most of the MIL tempera-
ture range, most applications do not require the use of the
normal balancing resistor (with its stability capacitor). Adding the
optional balancing resistor enhances performance at high
temperatures, as shown in Figure 26. Table II gives capacitor
values for several common low pass responses.
180
120
60
0
–60
–120
–180
–40
0
+40
+80
o
+120
O
O
μ
V
WITHOUT OPTIONAL
BALANCE RESISTOR, R3
TEMPERATURE – C
WITH OPTIONAL
BALANCE RESISTOR, R3
Figure 26. V
OS
vs. Temperature Performance of the 1 Hz
Filter Circuit
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