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TLV320AIC32 Datasheet(PDF) 22 Page - Burr-Brown (TI) |
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TLV320AIC32 Datasheet(HTML) 22 Page - Burr-Brown (TI) |
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22 / 87 page  www.ti.com H(z) + N0 ) N1 z*1 32768 * D1 z*1 (1) N0 ) 2 N1 z*1 ) N2 z*2 32768 * 2 D1 z*1 * D2 z*2 N3 ) 2 N4 z*1 ) N5 z*2 32768 * 2 D4 z*1 * D5 z*2 (2) LB1 LB2 RB1 RB2 TLV320AIC32 SLAS479B – AUGUST 2005 – REVISED AUGUST 2006 where the N0, N1, and D1 coefficients are fully programmable individually for each channel. The coefficients that should be loaded to implement standard de-emphasis filters are given in Table 1. Table 1. De-Emphasis Coefficients for Common Audio Sampling Rates SAMPLING FREQUENCY N0 N1 D1 32-kHz 16950 –1220 17037 44.1-kHz 15091 –2877 20555 48-kHz(1) 14677 –3283 21374 (1) Default De-emphasis Coeffiicients In addition to the de-emphasis filter block, the DAC digital effects processing includes a fourth order digital IIR filter with programmable coefficients (one set per channel). This filter is implemented as cascade of two biquad sections with frequency response given by: The N and D coefficients are fully programmable, and the entire filter can be enabled or bypassed. The structure of the filtering when configured for independent channel processing is shown below in Figure 26, with LB1 corresponding to the first left-channel biquad filter using coefficients N0, N1, N2, D1, and D2. LB2 similarly corresponds to the second left-channel biquad filter using coefficients N3, N4, N5, D4, and D5. The RB1 and RB2 filters refer to the first and second right-channel biquad filters, respectively. Figure 26. Structure of the Digital Effects Processing for Independent Channel Processing The coefficients for this filter implement a variety of sound effects, with bass-boost or treble boost being the most commonly used in portable audio applications. The default N and D coefficients in the part are given in Table 2 and implement a shelving filter with 0-dB gain from DC to approximately 150 Hz, at which point it rolls off to a 3-dB attenuation for higher frequency signals, thus giving a 3-dB boost to signals below 150 Hz. The N and D coefficients are represented by 16-bit two’s complement numbers with values ranging from –32768 to 32767. 27 Submit Documentation Feedback |
Similar Part No. - TLV320AIC32_07 |
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Similar Description - TLV320AIC32_07 |
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