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OPA2836 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
OPA2836 Very-Low-Power, Rail-to-Rail Out, Negative Rail In, Voltage-Feedback Operational Amplifiers TI
Texas Instruments TI
OPA2836 Datasheet PDF : 59 Pages
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OPA836, OPA2836
SLOS712I – JANUARY 2011 – REVISED OCTOBER 2016
www.ti.com
9.2.2 Active Filters
The OPA836 and OPA2836 devices are good choices for active filters. Figure 78 and Figure 79 show MFB and
Sallen-Key circuits designed using the WEBENCH® Filter Designer to implement second-order low-pass
Butterworth filter circuits. Figure 80 shows the frequency response.
Other MFB and Sallen-Key filter circuits offer similar performance. The main difference is the MFB is an inverting
amplifier in the pass-band and the Sallen-Key is noninverting. The primary advantage for each is the Sallen-Key
in unity gain has no resistor gain-error term, and thus no sensitivity to gain error, while the MFB has better
attenuation properties beyond the bandwidth of the operational amplifier.
1.24 kW
330 pF
1.24 kW 2.80 kW
2.2 nF
OPA 836
Figure 78. MFB 100-kHz Second-Order Low-Pass Butterworth Filter Circuit
562 W 6.19 kW
330 pF
2.2 nF
OPA836
Figure 79. Sallen-Key 100-kHz Second-Order Low-Pass Butterworth Filter Circuit
9.2.2.1 Application Curve
VS = 5 V,
0
VOUT = 100 mVpp
-10
MFB
-20
Sallen-Key
-30
-40
1k
10k
100k
1M
f - Frequency - Hz
Figure 80. MFB and Sallen-Key Second Order Low-Pass Butterworth Filter Response
40
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