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AD704JN Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD704JN
Szczegółowy opis  Quad Picoampere Input Current Bipolar Op Amp
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Strona internetowa  http://www.analog.com
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REV. C
AD704
–9–
The 1 Hz, 4-pole active filter offers dc precision with a minimum
of components and cost. The low current noise, IOS, and IB
allow the use of 1 M
Ω 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 temperature 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 5. Table II gives capacitor values for several common low
pass responses.
180
120
60
0
–60
–120
–180
–40
0
+40
+80
+120
TEMPERATURE – C
WITHOUT OPTIONAL
BALANCE RESISTOR, R3
WITH OPTIONAL
BALANCE RESISTOR, R3
Figure 5. VOS vs. Temperature Performance of the 1 Hz
Filter Circuit
Table II. 1 Hz, 4-Pole Low-Pass Filter Recommended Component Values
Section 1
Section 2
Desired Low
Frequency
Frequency
C1
C2
C3
C4
Pass Response
(Hz)
Q
(Hz)
Q
( F)
( F)
( F)
( F)
Bessel
1.43
0.522
1.60
0.806
0.116
0.107
0.160
0.0616
Butterworth
1.00
0.541
1.00
1.31
0.172
0.147
0.416
0.0609
0.1 dB Chebychev
0.648
0.619
0.948
2.18
0.304
0.198
0.733
0.0385
0.2 dB Chebychev
0.603
0.646
0.941
2.44
0.341
0.204
0.823
0.0347
0.5 dB Chebychev
0.540
0.705
0.932
2.94
0.416
0.209
1.00
0.0290
1.0 dB Chebychev
0.492
0.785
0.925
3.56
0.508
0.206
1.23
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.


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