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LA4440 датащи(PDF) 5 Page - Sanyo Semicon Device |
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LA4440 датащи(HTML) 5 Page - Sanyo Semicon Device |
5 / 13 page LA4440 No.750–5/13 Voltage Gain Adjust at Stereo Mode RNF=50Ω (typ), Rf=20kΩ (typ) At RNF’=0 (recommended VG) VG=20log (dB) In case of using RNF’ VG=20log (dB) VG RNF Rf RNF+RNF’ Voltage Gain Adjust at Bridge Amplifier Mode (No. 1) · The bridge amplifier configuration is as shown left, in which ch1 and ch2 operate as noninverting amplifier and inverting amplifier respectively. The output of the noninverting amplifier divided by resistors R3, R4 is applied, as input, to the inverting amplifier. Since attenuation (R4/R3) of the non-inverting amplifier output and amplification factor (Rf/R4+RNF) of the inverting amplifier are fixed to be the same, signals of the same level and 180 ° out of phase with each other can be obtained at output pins (12) and (10). The total voltage gain is apparently higher than that of the noninverting amplifier by 6dB and is approximately calculated by the following formula. VG=20log + 6dB In case of reducing the voltage gain, RNF’ is connected to the noninverting amplifier side only and the following formula is used. VG=20log + 6dB VG=20log (dB) where (RNF+RNF’) << R5 From this formula, it is seen that connecting RNF’ causes the voltage gain to be reduced at the modes of both stereo amplifier and bridge amplifier. Rf RNF Voltage Gain Adjust at Bridge Amplifier Mode (No. 2) Rf RNF+RNF’ Rf RNF+RNF’ 2 |
Аналогичный номер детали - LA4440 |
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Аналогичное описание - LA4440 |
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