Cirrus Logic CS5378 - Manual (Page 10)

CS5378
DS639F3 10
Bits 23:20 19:16 15:12 11:8 7:4 3:0
Selection 0000 0000 IIR2 IIR1 FIR2 FIR1
Figure 3. FIR and IIR Coefficient Set Selection Word
Bits 15:12 IIR2 Coefficients
0000 3 Hz @ 2000 SPS
0001 3 Hz @ 1000 SPS
0010 3 Hz @ 500 SPS
0011 3 Hz @ 333 SPS
0100 3 Hz @ 250 SPS
Bits 11:8 IIR1 Coefficients
0000 3 Hz @ 2000 SPS
0001 3 Hz @ 1000 SPS
0010 3 Hz @ 500 SPS
0011 3 Hz @ 333 SPS
0100 3 Hz @ 250 SPS
Bits 7:4 FIR2 Coefficients
0000 Linear Phase
0001 Minimum Phase
Bits 3:0 FIR1 Coefficients
0000 Linear Phase
0001 Minimum Phase
Test Bit Stream Characteristic Equation:
(Signal Freq) * (# TBS Data) * (Interpolation + 1) = Output Rate
Example: (31.25 Hz) * (1024) * (0x07 + 1) = 256 kHz
Signal
Frequency
(TBSDATA)
Output
Rate
(TBSCLK)
Output Rate
Selection
(RATE)
Interpolation
Selection
(INTP)
10.00 Hz 256 kHz 0x4 0x18
10.00 Hz 512 kHz 0x5 0x31
25.00 Hz 256 kHz 0x4 0x09
25.00 Hz 512 kHz 0x5 0x13
31.25 Hz 256 kHz 0x4 0x07
31.25 Hz 512 kHz 0x5 0x0F
50.00 Hz 256 kHz 0x4 0x04
50.00 Hz 512 kHz 0x5 0x09
125.00 Hz 256 kHz 0x4 0x01
125.00 Hz 512 kHz 0x5 0x03
Table 2. TBS Configurations Using On-Chip Data