AD825ARZ-16-REEL7 Analog Devices Inc, AD825ARZ-16-REEL7 Datasheet - Page 11
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AD825ARZ-16-REEL7
Manufacturer Part Number
AD825ARZ-16-REEL7
Description
IC OPAMP JFET GP 26MHZ 16SOIC
Manufacturer
Analog Devices Inc
Datasheet
1.AD825ARZ.pdf
(12 pages)
Specifications of AD825ARZ-16-REEL7
Amplifier Type
J-FET
Number Of Circuits
1
Slew Rate
140 V/µs
Gain Bandwidth Product
26MHz
-3db Bandwidth
46MHz
Current - Input Bias
15pA
Voltage - Input Offset
1000µV
Current - Supply
6.5mA
Current - Output / Channel
50mA
Voltage - Supply, Single/dual (±)
10 V ~ 36 V, ±5 V ~ 18 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
SECOND-ORDER LOW-PASS FILTER
A second-order Butterworth low-pass filter can be implemented
using the AD825 as shown in Figure 33. The extremely low bias
currents of the AD825 allow the use of large resistor values and,
consequently, small capacitor values without concern for
developing large offset errors. Low current noise is another
factor in permitting the use of large resistors without having to
worry about the resultant voltage noise.
With the values shown, the corner frequency will be 1 MHz.
The equations for component selection are shown below. Note
that the noninverting input (and the inverting input) has an
input capacitance of 6 pF. As a result, the calculated value of C1
(12 pF) is reduced to 6 pF.
A plot of the filter frequency response is shown in Figure 34;
better than 40 dB of high frequency rejection is provided.
C1
C2
R1
=
(
=
farads
R2
2
π
=
f
. 1
CUTOFF
User
414
)
=
2
π
Selected
R1
f
. 0
CUTOFF
707
(
Typically
R1
10
k
Ω
to
100
k
Ω
)
Rev. F | Page 11 of 12
Figure 34. Frequency Response of Second-Order Butterworth Filter
–10
–20
–30
–40
–50
–60
–70
–80
V
IN
0
10k
Figure 33. Second-Order Butterworth Low-Pass Filter
9.31kΩ
R1
9.31kΩ
100k
R2
6pF
C2
24pF
C1
FREQUENCY (Hz)
AD825
1M
+5V
–5V
0.1µF
0.1µF
C3
C4
10M
V
OUT
100M
AD825