CS5378 查看數據表（PDF） - Cirrus Logic

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CS5378

Low-power Single-channel Decimation Filter

Cirrus Logic 

CS5378

IIR1 – Single stage, no decimation

1st order no decimation, 3 coefficients

Coefficient set 0: high-pass, corner 0.15% fs (3 Hz at 2000 SPS)

Coefficient set 1: high-pass, corner 0.30% fs (3 Hz at 1000 SPS)

Coefficient set 2: high-pass, corner 0.60% fs (3 Hz at 500 SPS)

Coefficient set 3: high-pass, corner 0.90% fs (3 Hz at 333 SPS)

Coefficient set 4: high-pass, corner 1.20% fs (3 Hz at 250 SPS)

IIR2 – Single stage, no decimation

2nd order no decimation, 5 coefficients

Coefficient set 0: high-pass, corner 0.15% fs (3 Hz at 2000 SPS)

Coefficient set 1: high-pass, corner 0.30% fs (3 Hz at 1000 SPS)

Coefficient set 2: high-pass, corner 0.60% fs (3 Hz at 500 SPS)

Coefficient set 3: high-pass, corner 0.90% fs (3 Hz at 333 SPS)

Coefficient set 4: high-pass, corner 1.20% fs (3 Hz at 250 SPS)

IIR3 – Two stage, no decimation

3rd order no decimation, 8 coefficients

(Combined IIR1 and IIR2 filter responses)

Coefficient set 0,0: high-pass, corner 0.20% fs (4 Hz at 2000 SPS)

Coefficient set 1,1: high-pass, corner 0.41% fs (4 Hz at 1000 SPS)

Coefficient set 2,2: high-pass, corner 0.82% fs (4 Hz at 500 SPS)

Coefficient set 3,3: high-pass, corner 1.22% fs (4 Hz at 333 SPS)

Coefficient set 4,4: high-pass, corner 1.63% fs (4 Hz at 250 SPS)

Figure 31. IIR Filter Stages

IIR filters

IIR1 Coeff IIR1

Selection Corner

Frequency

0

0.15% fs

1

0.30% fs

2

0.60% fs

3

0.90% fs

4

1.20% fs

IIR2 Coeff

Selection

0

1

2

3

4

IIR2

Corner

Frequency

0.15% fs

0.30% fs

0.60% fs

0.90% fs

1.20% fs

IIR3 Coeff

Selection

0,0

1,1

2,2

3,3

4,4

IIR3

Corner

Frequency

0.2041% fs

0.4074% fs

0.8152% fs

1.2222% fs

1.6293% fs

Table 16. IIR Filter Characteristics

DS639F2

54

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