OPA2631 Burr-Brown, OPA2631 Datasheet - Page 12

• Manufacturer Part Number: OPA2631
• Description: Dual / Low Power / Single-Supply OPERATIONAL AMPLIFIER
• Manufacturer: Burr-Brown

FIGURE 3. Bandpass Filter.
FIGURE 4. Nominal Filter Response.
at the center of its range, the following equations give the
resistor values that produce the best DC offset.
where:
–10
–20
–30
–40
–50
–60
10
0
10K
NG = G + V
R
R
R
NG = 1 + R
V
1
2
3
OUT
= R
= R
= R
®
= (G)V
4
4
4
OPA2631
/G
/(NG – G)
/(NG –1)
100K
4
V
/R
IN
OUT
OUT
3
+ (NG – G)V
(Noise Gain)
Frequency (Hz)
/V
S
1M
1.2nF
86.6
S
V
IN
10M
130
1.8nF
60.4
1.2nF
100M
7.32k
2.2nF
1.2nF
59
OPA2631
200
1/2
12
FIGURE 5. DC Level Shifting Circuit.
Make sure that V
and output voltage ranges.
The front page circuit is a good example of this type of
application. It was designed to take V
0.5V, and produce V
+3V supply. This means G = 2.00, and V
• 0.25V = 1.00V. Plugging into the above equations gives:
NG = 2.33, R
resistors were adjusted to the nearest standard values.
681
330pF
V
IN
OPA2631
1
1/2
200
= 375 , R
R
20
1
IN
and V
OUT
46.4
3.9nF
133
27pF
1% Resistors
5% Capacitors
R
3
between 1V and 2V, when using a
OUT
2
R
= 2.25k , and R
2
stay within the specified input
73.2
3.9nF
OPA2631
+V
1/2
S
R
4
IN
between 0V and
OUT
3
= 563 . The
= 1.50V – G
V
OUT