AD706KN AD [Analog Devices], AD706KN Datasheet - Page 8

• Manufacturer Part Number: AD706KN
• Description: Dual Picoampere Input Current Bipolar Op Amp
• Manufacturer: AD [Analog Devices]

0.200 (5.08)
AD706
A 1 Hz, 4-Pole, Active Filter
Figure 25 shows the AD706 in an active filter application. An
important characteristic of the AD706 is that both the input bias
current, input offset current and their drift remain low over
most of the op amp’s rated temperature range. Therefore, for
most applications, there is no need to use the normal balancing
resistor. Adding the balancing resistor enhances performance at
high temperatures, as shown by Figure 26.
0.200 (5.08)
0.125 (3.18)
MAX
0.023 (0.58)
0.014 (0.36)
0.005 (0.13)
MIN
8
1
0.405 (10.29)
PIN 1
0.100
(2.54)
MAX
BSC
Desired Low
Pass Response
Bessel
Butterworth
0.1 dB Chebychev
0.2 dB Chebychev
0.5 dB Chebychev
1.0 dB Chebychev
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 F, C2 = 0.0357 F, C3 = 0.0533 F, C4 = 0.0205 F.
0.055 (1.4)
0.070 (1.78)
0.030 (0.76)
MAX
5
4
0.060 (1.52)
0.015 (0.38)
0.310 (7.87)
0.220 (5.59)
Cerdip
(Q-8)
0.150
(3.81)
MIN
SEATING
PLANE
*WITHOUT THE NETWORK,
PINS 1 & 2, AND 6 & 7 OF THE
AD706 ARE TIED TOGETHER.
CAPACITORS C1 & C2
ARE SOUTHERN ELECTRONICS
MPCC, POLYCARB
15
0
0.320 (8.13)
0.290 (7.37)
INPUT
Table II. 1 Hz, 4-Pole, Low Pass Filter Recommended Component Values
0.015 (0.38)
0.008 (0.20)
Section 1
Frequency
(Hz)
1.43
1.00
0.648
0.603
0.540
0.492
1M
R1
5%, 50 VOLT
1M
R2
0.210 (5.33)
0.160 (4.06)
0.115 (2.93)
Figure 25. A 1 Hz, 4-Pole Active Filter
0.022 (0.558)
0.014 (0.356)
MAX
C2
Q
0.522
0.541
0.619
0.646
0.705
0.785
3
2
Dimensions shown in inches and (mm).
2M
AD706
R5
8
C1
0.430 (10.92)
+
–
1
0.348 (8.84)
1/2
OUTLINE DIMENSIONS
–V
PIN 1
(2.54)
0.100
BSC
4
S
Plastic Mini-DIP
0.070 (1.77)
0.045 (1.15)
0.01 F
5
4
0.1 F
1
C5
Section 2
Frequency
(Hz)
1.60
1.00
0.948
0.941
0.932
0.925
0.280 (7.11)
0.240 (6.10)
0.060 (1.52)
0.015 (0.38)
–8–
(N-8)
0.130
(3.30)
MIN
SEATING
PLANE
OPTIONAL BALANCE
RESISTOR NETWORKS*
1M
R3
0.325 (8.25)
0.300 (7.62)
Figure 26. V
of the 1 Hz Filter
0.015 (0.381)
0.008 (0.204)
–120
–180
1M
Q
0.806
1.31
2.18
2.44
2.94
3.56
–60
180
120
R4
60
0
C4
0.195 (4.95)
0.115 (2.93)
–40
C3
C1
( F)
0.116
0.172
0.304
0.341
0.416
0.508
2M
5
6
OS
R6
AD706
–
+V
1/2
vs. Temperature Performance
8
S
0.0098 (0.25)
0.0040 (0.10)
0.2440 (6.20)
0.2284 (5.80)
BALANCE RESISTOR, R3
0
0.01 F
WITHOUT OPTIONAL
SEATING
C2
( F)
0.107
0.147
0.198
0.204
0.209
0.206
C6
7
TEMPERATURE – C
0.1 F
PLANE
WITH OPTIONAL BALANCE
0.0500
0.1968 (5.00)
0.1890 (4.80)
(1.27)
8
1
BSC
+40
PIN 1
C3
( F)
0.160
0.416
0.733
0.823
1.00
1.23
RESISTOR, R3
0.0192 (0.49)
0.0138 (0.35)
OUTPUT
SOIC
0.102 (2.59)
0.094 (2.39)
(R-8)
5
4
0.1574 (4.00)
0.1497 (3.80)
+80
C4
( F)
0.0385
0.0347
0.0290
0.0242
0.0098 (0.25)
0.0075 (0.19)
0.0616
0.0609
8
0
0.0196 (0.50)
0.0099 (0.25)
+120
0.0500 (1.27)
0.0160 (0.41)
REV. C
x 45