CS5376-BS データシートの表示（PDF） - Cirrus Logic

部品番号

コンポーネント説明

メーカー

CS5376-BS

Low Power Multi-Channel Decimation Filter

Cirrus Logic 

CS5376

Modulator

Input

512 kHz

Sinc Filter

16-128

FIR1

4,16

FIR2

2,4

IIR1

1st Order

IIR2

2nd Order

DC Offset

& Gain

Correction

Output to High Speed Serial Data Port (SD Port)

Output Rate 62.5 Hz ~ 4 kHz

Figure 4. Digital Filtering Stages

Alternately, the CS5376 can be used in stand-alone

mode, where a configuration EEPROM replaces

the microcontroller. The CS5376 reads configura-

tion commands and filter coefficients directly from

EEPROM, and then enters a fixed operational state.

The stand-alone configuration simplifies system

design by eliminating the CS5376 to microcontrol-

ler interface.

2.2 Digital Filter Description

Multi-Stage Signal Processing Architecture

The CS5376 has a multi-stage signal processing ar-

chitecture consisting of a hardware sinc filter, two

FIR filters, and a selectable 1st, 2nd, or 3rd order

IIR filter. The filter architecture is flexible, with the

capability to bypass later filter stages and output

data immediately following any filter. Figure 4 il-

lustrates the digital filter stages of the CS5376.

The digital filters have decimation ratios that can

achieve data output word rates (OWRs) between

62.5 sps and 4000 sps. Figure 5 lists the standard

OWRs and their associated output periods. Slower

output word rates can be achieved by scaling down

the master clock input.

Programmable or Fixed Coefficients

The CS5376 is designed to load custom filter coef-

ficients and other configuration information via the

SPI 1 serial port from either a microcontroller or a

configuration EEPROM.

The programmed FIR filter coefficients can imple-

ment any type of finite impulse response filter. Lin-

ear phase, minimum phase, phase compensation, or

other complex filter types can be used depending

on the application requirements. The programmed

IIR filter coefficients can implement a 1st, 2nd, or

Output Word Rate

(OWR)

4000 sps

2000 sps

1000 sps

500 sps

333.3 sps

250 sps

125 sps

62.5 sps

Output Period

0.25 ms

0.5 ms

1.0 ms

2.0 ms

3.0 ms

4.0 ms

8.0 ms

16.0 ms

Figure 5. Digital Filter OWRs

DS256PP1

9

Share Link: