AD704JR 查看數據表（PDF） - Analog Devices
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AD704JR Datasheet PDF : 8 Pages
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AD704
The 1 Hz, 4-pole active filter offers dc precision with a mini-
mum of components and cost. The low current noise, IOS, and
IB allow the use of 1 MΩ resistors without sacrificing the
1 µV/°C drift of the AD704. This means lower capacitor values
may be used, reducing cost and space. Furthermore, since the
AD704’s IB is as low as its IOS, 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
WITHOUT OPTIONAL
BALANCE RESISTOR, R3
WITH OPTIONAL
BALANCE RESISTOR, R3
–180
–40
0
+40
+80
TEMPERATURE – oC
+120
Figure 26. VOS vs. Temperature Performance of the 1 Hz
Filter Circuit
Table II. 1 Hz, 4-Pole Low-Pass Filter Recommended Component Values
Desired Low
Pass Response
Section 1
Frequency
(Hz)
Q
Section 2
Frequency
(Hz)
Q
C1
(F)
C2
(F)
C3
(F)
C4
(F)
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 µF,
C2 = 0.0357 µF, C3 = 0.0533 µF, C4 = 0.0205 µF.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
14-Pin Cerdip (Q) Package
14-Pin Plastic DIP (N) Package
16-Pin Plastic SO (R) Package
20-Terminal LCCC (E) Package
0.100 (2.54)
0.064 (1.63)
0.358 (9.09)
0.342 (8.69)
0.040 (1.02)
x 45° REF
3 PLCS
0.050
(1.27)
BSC
NO. 1 PIN
INDEX
0.028 (0.71)
0.022 (0.56)
0.020 (0.51)
x 45° REF
–8–
REV. A
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