AD706 Ver la hoja de datos (PDF) - Analog Devices
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AD706 Datasheet PDF : 11 Pages
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AD706
INPUT
R1
1M⍀
R2
1M⍀
*WITHOUT THE NETWORK,
PINS 1 AND 2, AND 6 AND 7
OF THE AD706 ARE TIED
TOGETHER.
CAPACITORS C1 AND C2
ARE SOUTHERN ELECTRONICS
MPCC, POLYCARB ؎5%, 50V
C1
3+
C2 1/2
AD706
2– 4
–VS
1
0.1F
R5
2M⍀
C5
0.01F
R3
1M⍀
R4
1M⍀
C4
C3 +VS
0.1F
8
5+
1/2
AD706 7
6–
R6
2M⍀
C6
0.01F
OPTIONAL BALANCE
RESISTOR NETWORKS*
Figure 7. 1 Hz, 4-Pole Active Filter
OUTPUT
1 Hz, 4-Pole, Active Filter
180
Figure 7 shows the AD706 in an active filter application. An
important characteristic of the AD706 is that both the input bias
120
current, input offset current, and their drift remain low over
most of the op amp’s rated temperature range. Therefore, for
60
most applications, there is no need to use the normal balancing
resistor. Adding the balancing resistor enhances performance at
0
high temperatures, as shown by Figure 8.
–60
WITHOUT OPTIONAL
BALANCE RESISTOR, R3
WITH OPTIONAL BALANCE
RESISTOR, R3
–120
–180
–40
0
40
80
120
TEMPERATURE – ؇C
Figure 8. VOS vs. Temperature Performance
of the 1 Hz Filter
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 C2 C3 C4
(F) (F) (F) (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
NOTE
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.
–8–
REV. F
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