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AN4598 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN4598 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 12 page Op amp choice AN4598 6/12 DocID026988 Rev 1 4 Op amp choice The MP23AB02B microphone supply voltage is between 1.6 V and 3.6 V. If we want to have only one power supply domain in our application, we should use a low voltage op amp which is output rail-to-rail (especially at these low voltages where losing 1 V really makes a difference). Considering the noise level, slew rate, and THD requirements, the recommended operational amplifiers are given in Table 1. Note that all these op amps are available in automotive grade versions. The first choice is the TS971. For driving low loads the TS922 or TS982 should be used. If the op amp has a dedicated high-voltage power supply (single or dual supply), the MC33078 should be used. Table 1. Recommended op amps Vcc (V) Noise (nV/√Hz) Slew rate (V/µs) Rail-to-rail output Minimum load (Ω) TS971 2.7 to 10 4 4 Yes 2 k TS982 2.5 to 5.5 17 0.7 16 TS922 2.7 to 12 9 1.3 32 MC33078 5 to 30 4.5 7 No 600 |
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