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TSC2117 Datasheet(PDF) 37 Page - Texas Instruments |
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TSC2117 Datasheet(HTML) 37 Page - Texas Instruments |
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37 / 192 page  M n n n 0 H(z) FIR z M 24 for PRB _ R6, PRB _ R18 M 19 for PRB _ R12 - = = = = å (5-3) TSC2117 Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller www.ti.com SLAS550A – APRIL 2009 – REVISED JUNE 2009 5.5.4.3.3 FIR Section Three of the available ADC processing blocks offer FIR filters for signal processing. Processing block PRB_R12 features a 20-tap FIR filter, whereas the processing blocks PRB_R6 and PRB_R18 feature a 25-tap FIR filter. The coefficients of the FIR filters are 16-bit 2s-complement format (2 bytes each) and correspond to the ADC coefficient space as listed in Table 5-19. Note that the default (reset) coefficients are not vaild for the FIR filter. When the FIR filter is used, all applicable coefficients must be reprogrammed by the user. To reprogram the FIR filter coefficients as an all-pass filter, write value 0x00 to page 4/registers 24, 25, 34, 35, 44, 45, 54, and 55. Table 5-19. ADC FIR Filter Coefficients Filter FIlter Coefficient RAM Default (Reset) Values – Not Valid for the FIR Filter – Must Coefficient Location Be Reprogrammed by User Fir0 Page 4/registers 14–15 0x7FFF (decimal 1.0 – LSB value) Fir1 Page 4/registers 16–17 0x0000 Fir2 Page 4/registers 18–19 0x0000 Fir3 Page 4/registers 20–21 0x0000 Fir4 Page 4/registers 22–23 0x0000 Fir5 Page 4/registers 24–25 0x7FFF (decimal 1.0 – LSB value) Fir6 Page 4/registers 26–27 0x0000 Fir7 Page 4/registers 28–29 0x0000 Fir8 Page 4/registers 30–31 0x0000 Fir9 Page 4/registers 32–33 0x0000 Fir10 Page 4/registers 34–35 0x7FFF (decimal 1.0 – LSB value) Fir11 Page 4/registers 36–37 0x0000 Fir12 Page 4/registers 38–39 0x0000 Fir13 Page 4/registers 40–41 0x0000 Fir14 Page 4/registers 42–43 0x0000 Fir15 Page 4/registers 44–45 0x7FFF (decimal 1.0 – LSB value) Fir16 Page 4/registers 46–47 0x0000 Fir17 Page 4/registers 48–49 0x0000 Fir18 Page 4/registers 50–51 0x0000 Fir19 Page 4/registers 52–53 0x0000 Fir20 Page 4/registers 54–55 0x7FFF (decimal 1.0 – LSB value) Fir21 Page 4/registers 56–57 0x0000 Fir22 Page 4/registers 58–59 0x0000 Fir23 Page 4/registers 60–61 0x0000 Fir24 Page 4/registers 62–63 0x0000 Submit Documentation Feedback APPLICATION INFORMATION 37 |
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