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AN2995 Datasheet(PDF) 4 Page - STMicroelectronics |
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AN2995 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 13 page Possible configurations AN2995 4/13 Doc ID 15840 Rev 1 3 Possible configurations This chapter provides instructions on how to set-up the board with several typical configurations. ● Figure 3: low-pass Sallen-Key configuration ● Figure 4: high-pass Sallen-Key configuration ● Figure 5: differential amplifier configuration ● Figure 6: in-loop compensation configuration ● Figure 7: out-of-loop compensation configuration ● Figure 8: AC-coupled configuration You can also connect several boards together if you need to evaluate more complicated schematics using several operational amplifiers. 3.1 Low-pass Sallen-Key configuration The low-pass Sallen-Key configuration is a second-order filter configuration. Z4 and Z9 are used to set the gain. Fc = 1/(2*PI*sqrt(Z1*Z2*C5*C6)) Z7, Z8, Z12 and Z14 must be "not connected". Z3 and Z13 must be shorted. Figure 3. Low-pass Sallen-Key configuration 3.2 High-pass Sallen-Key configuration Like the low-pass Sallen Key configuration, this is also a second-order filter configuration. Z4 and Z9 are used to set the gain. Fc = 1/(2*PI*sqrt(C1*C2*Z5*Z6)) Z7, Z8, Z12 and Z14 must be "not connected". Z3 and Z13 must be shorted. Vout Vin1 Z9 Z5 Z2 Z1 Z6 Z4 AM04502 |
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