CS5376 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5376

Low Power Multi-Channel Decimation Filter

Cirrus Logic 

CS5376

8.5 Reference Coefficients

Included in the CS5376 are reference coefficients

for the FIR1, FIR2, 1st order IIR, and 2nd order IIR

filters. These coefficients provide excellent perfor-

mance over the specified CS5376 bandwidth. Use

of the reference coefficients minimizes develop-

ment effort and simplifies system setup.

8.5.1 Reference FIR coefficients

The reference FIR1 coefficient set is a 38 tap linear

phase filter, and the reference FIR2 coefficient set

is a 126 tap linear phase filter. A listing of the ref-

erence FIR coefficients is provided in Figure 40.

Note that linear phase coefficients are symmetric

so only half of each coefficient set is listed.

The combined FIR1 and FIR2 reference coeffi-

cients provide excellent performance for general

FIR1 - 38 Tap Linear Phase (Symmetric, 1/2 Coeff Shown)

h(1) = -3363

h(6) = 17858

h(11) = -228950

h(16) = 1820850

h(2) = -12069

h(7) = 128486

h(12) = -821735

h(17) = 4419986

h(3) = -27056

h(8) = 266726

h(13) = -1280574

h(18) = 6887230

h(4) = -43884

h(9) = 321261

h(14) = -1190828

h(19) = 8388607

h(5) = -36017

h(10) = 179350

h(15) = -180214

FIR2 - 126 Tap Linear Phase (Symmetric, 1/2 Coeff Shown)

h(1) =-71

h(6) = 1786

h(11) = 2985

h(16) = 7756

h(21) = 17500

h(26) = 29808

h(31) = 33021

h(36) = 4436

h(41) = -81993

h(46) = -238025

h(51) = -443272

h(56) = -642475

h(61) = -766230

h(2) =-371

h(7) = 2291

h(12) = 3784

h(17) = 5935

h(22) = 4388

h(27) = -9795

h(32) = -47092

h(37) = -109189

h(42) = -174452

h(47) = -187141

h(52) = -49958

h(57) = 454990

h(62) = 3875315

h(3) =-870

h(8) = 291

h(13) = -1458

h(18) = -7135

h(23) = -20661

h(28) = -42573

h(33) = -62651

h(38) = -54172

h(43) = 22850

h(48) = 208018

h(53) = 533334

h(58 ) = 1113788

h(63) = 8388607

h(4) = -986

h(9) = -2036

h(14) = -5808

h(19) = -11691

h(24) = -15960

h(29) = -7745

h(34) = 29702

h(39) = 109009

h(44) = 221211

h(49) = 318763

h(54) = 298975

h(59 ) = -137179

h(5) = 34

h(10) = -943

h(15) = -1007

h(20) = 3531

h(25) = 18930

h(30) = 49994

h(35) = 90744

h(40) = 114154

h(45) = 68863

h(50) = -116005

h(55) = -553873

h(60) = -1854336

IIR 1st Order Coefficients

a11 = -8286568

b10 = 8286570

b11 = -8286570

IIR 2nd Order Coefficients

a21 = -8336965

a22 = 4143286

b20 = 4194304

b21 = -8388607

b22 = 4194303

Figure 40. Reference Coefficients

DS256PP1

63

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