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TDA7439 数据表(PDF) 8 Page - STMicroelectronics |
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TDA7439 数据表(HTML) 8 Page - STMicroelectronics |
8 / 23 page Application suggestions TDA7439 8/23 3 Application suggestions The first and the last stages are volume control blocks. The control range is 0 to -47 dB and mute for the first stage and 0 to -79 dB and mute for the last one. Both control blocks have a step resolution of 1 dB. This very high resolution allows the implementation of systems free from any noisy acoustical effect. The TDA7439 audio processor provides 3 bands of tone control (bass, mid-range and treble). 3.1 Tone control 3.1.1 Bass, mid-range stages The bass and the mid-range cells have the same structure. However, the bass cell has an internal resistor RB of typically 44 kΩ whilst the mid-range cell has an internal resistor RM of typically 25 kΩ. Several filter types can be implemented by connecting external components to the bass/mid IN and OUT pins. Typical responses are shown in Figure 8, Figure 9 and Figure 11. Figure 4. Bass/mid-range filter implementation Figure 4. refers to the basic T-type band-pass filter. Starting from the filter component values (R1 (internal) and R2, C1, C2 (external)) then the centre frequency fC, the gain Av at maximum boost and the filter Q factor are computed as follows: Ri internal C2 OUT IN C1 R2 D95AU313 f C 1 2 π R1 R2 C1 C2 ⋅⋅ ⋅ ⋅⋅ ----------------------------------------------------------------- = A V R2C2 R2C1 RiC1 ++ R2C1 R2C2 + ------------------------------------------------------------ = Q R1 R2 C1 C2 ⋅⋅ ⋅ R2C1 R2C2 + ------------------------------------------------- = |
类似零件编号 - TDA7439 |
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类似说明 - TDA7439 |
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