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TS925IDT Arkusz danych(PDF) 11 Page - STMicroelectronics |
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TS925IDT Arkusz danych(HTML) 11 Page - STMicroelectronics |
11 / 17 page TS925 Using the TS925 as a preamplifier and speaker driver 11/17 3 Using the TS925 as a preamplifier and speaker driver The TS925 is an input/output rail-to-rail quad BiCMOS operational amplifier. It is able to operate with low supply voltages (2.7V) and to drive low output loads such as 32 Ω. As an illustration of these features, the following technical note highlights many of the advantages of the device in a global audio application. 3.1 Application circuit Figure 16 shows two operators (A1, A4) used in a preamplifier configuration, and the two others in a push-pull configuration driving a headset. The phantom ground is used as a common reference level (VCC/2). The power supply is delivered from two LR6 batteries (2 x 1.5V nominal). Preamplifier The operators A1 and A4 are wired with a non-inverting gain of respectively: • A1# (R4/(R3+R17)) • A4# R6/R5 With the following values chosen: • R4 = 22kΩ -R3= 50Ω -R17 = 1.2kΩ • R6 = 47kΩ -R5= 1.2kΩ, The gain of the preamplifier chain is therefore equal to 58dB. Alternatively, the gain of A1 can be adjusted by choosing a JFET transistor Q1 instead of R17. This JFET voltage controlled resistor arrangement forms an automatic level control (ALC) circuit, useful in many microphone preamplifier applications. The mean rectified peak level of the output signal envelope is used to control the preamplifier gain. |
Podobny numer części - TS925IDT |
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Podobny opis - TS925IDT |
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