OVERVIEW
The SM5847AF is a 4/8-times oversampling (inter polation), 2-channel, linear-phase FIR, multi-function digital filter for digital audio reproduction equipment. It features independent left and right channel digital deemphasis filters and soft muting function.

FEATURES
■ Left/right-channel (2-channel processing)
■ 4-times/8-times oversampling (interpolation)
   • 8-times interpolation filter
      - 3-stage linear-phase FIR configuration
        1st stage (fs to 2fs): 169-tap
        2nd stage (2fs to 4fs): 29-tap
        3rd stage (4fs to 8fs): 17-tap
     - ≤±0.00002 dB passband ripple (0 to 0.4535fs)
     - ≥117 dB stopband attenuation (0.5465fs to 7.4535fs)
  • 4-times interpolation filter
    - 2-stage linear-phase FIR configuration
        1st stage (fs to 2fs): 169-tap
        2nd stage (2fs to 4fs): 29-tap
   - ≤±0.00002 dB passband ripple (0 to 0.4535fs)
   - ≥116 dB stopband attenuation (0.5465fs to 3.4535fs)
■ Digital deemphasis
  • IIR filter configuration
  • fs = 32kHz, 44.1kHz, 48kHz
  • 2-channel independent ON/OFF control
■ 26 ×24-bit parallel multiplier/32-bit accumulator
■ Overflow limiter
■ Soft muting
  • 2-channel independent ON/OFF control
■ Input data format
• 2s complement, MSB first
• 3 selectable formats
  - LR alternating, 16/18/20/24-bit serial, righ justified data
  - LR alternating, 24-bit serial, left-justifie data
  - LR simultaneous, 24-bit serial, left-justifie data
■ Output data format
    • 2s complement, MSB first, LR simultaneous
    • 18/20/22/24-bit serial
    • BCKO burst (NPC format)
■ Dither round-off processing
• Dither round-off ON/OFF selectable
■ 25-bit internal data word length
■ Internal system clock
    • 192fs/256fs selectable
    • Maximum operating frequency
      192fs mode: 37 MHz max (5 V)
                       20.7 MHz max (3 V)
      256fs mode:  27.6 MHz max (5 V)
                       25 MHz max (3 V)
■ Jitter-free function
   • Jitter-free/Sync mode selectable
■ Crystal oscillator circuit built-in
■ 3 to 5 V supply
■ 44-pin plastic QFP
■ CMOS process