CS5376A datasheet(79/107 Pages) CIRRUS

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CS5376A

22. REVISION HISTORY

The CS5376A is a pin compatible upgrade to the

CS5376. The part family has had three revisions:

CS5376 rev A

CS5376 rev B

CS5376A rev A

The part number change for CS5376A reflects ad-

ditional functionality built into the device.

22.1 Changes from CS5376 rev A to CS5376

rev B

New Sinc Filter, SINC3

Added a new sinc filter, SINC3, between the previ-

ous sinc filters and FIR1. Will permit higher deci-

mation rates for seismology applications. Not used

for 0.25 ms, 0.5 ms, 1 ms, or 2 ms output rates to

maintain backward compatibility.

Added FIR1 Coefficients

Included an improved FIR1 filter to compensate for

sinc filter droop. Previous filter had stop band fre-

quency components up to -100 dB not removed by

the FIR2 brick wall filter. Required stop band at-

tenuation is 130 dB minimum. Previous FIR1 filter

coefficients still included to maintain backwards

compatibility.

Added IIR Coefficients

Included 3 Hz IIR1 and IIR2 filter coefficients for

the 0.5 ms, 1 ms, 2 ms, 3 ms, and 4 ms configura-

tions (5 sets IIR1, 5 sets IIR2). Previous

2 Hz @ 1 ms coefficient set was removed.

Modified Output Word Rate Selection

Changed the DEC bit settings in the FILTCFG reg-

ister used to select an output word rate. Re-num-

bered to include the new 120 Hz, 60 Hz, 30 Hz,

15 Hz, and 7.5 Hz output rates. Other settings the

same for backward compatibility.

Modified ROM Coefficient Selection Method

Changed the ROM coefficient selection routines

(SPI and EEPROM) to require a 24 bit data word.

Previously no data word was required, only the

command byte. The data word is parsed to select

the FIR1, FIR2, IIR1, and IIR2 coefficient sets.

Modified ROM TBS Data Selection Method

Changed the ROM test bit stream selection routine

(SPI and EEPROM) to require a 24 bit data word.

Previously no data word was required, only the

command byte. The data word scales the ROM test

bit stream data to a user selected amplitude.

Modified SPI port to strobe SINT pin

The SPI port now pulses the SINT pin whenever

data is received. Can be used by a microcontroller

to trigger additional data writes. Eliminates the

need to poll the e2dreq bit.

Fixed continuous synchronization operation

The synchronization operation was modified to

permit continuous re-sync. The SD port FIFO is no

longer reset by the SYNC interrupt.

Corrected EEPROM loader bug

The EEPROM loader bug is fixed. A preamble to

write required constants into memory is no longer

required.

22.2 Changes from CS5376 rev B to

CS5376A rev A

Fixed synchronization repeatability bug

Identical synchronization signals previously

caused different impulse responses from multi-

ple devices. Synchronization is now repeatable.

CS5376A Datasheet(PDF) 79 Page - Cirrus Logic

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