CS5376A datasheet(80/107 Pages) CIRRUS

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CS5376A

Modified SINC2 filter to correct gain and tim-

ing errors

Corrected SINC2 decimate by 2 gain error

which affected 4000 SPS operation. Also mod-

ified SINC2 decimate by 16 output timing to

match output of other SINC2 rates. Previous

SINC2 decimate by 16 output was one sample

later than expected.

Corrected gain error of 333 SPS output rate

SINC architecture was modified to correct gain

error in SINC2 decimate by 12 by moving dec-

imate by 3 stage into SINC3.

Modified SINC3 filter for new low bandwidth

rates.

Newly supported output word rates are 200,

125, 100, 50, 40, 25, 20, 10, 5, 1 SPS. Older low

bandwidth rates of 120, 60, 30, 15, 7.5 SPS

were removed. No changes to 4000, 2000,

1000, 500, 333, 250 SPS rates for backwards

compatibility to CS5376 revision A/B.

Added minimum phase FIR coefficients

Minimum phase FIR1 coefficient set 1 and

FIR2 coefficient set 1 are newly available as se-

lections for the SPI and EEPROM 'Write ROM

Coefficients' command.

Corrected IIR2/IIR3 channels 2, 3, 4 bug

When selecting IIR2 or IIR3 output, data from

channels 2, 3, and 4 were corrupted. IIR2 and

IIR3 now operate correctly for these channels.

Corrected IIR2 coefficient DC offset

IIR2 coefficient sets 0, 1, and 3 did not perfect-

ly cancel DC due to coefficient b20, b21, b22

mismatch. New b21 IIR2 coefficients correct

this offset error.

Removed gain scale factor from 'Write TBS

ROM' command

TBS data was previously scaled during config-

uration by a data word following the 'Write

TBS ROM' command. Added a new TBSGAIN

the TBS amplitude and can be modified during

normal operation.

Removed watchdog timer

The watchdog timer was removed. Replaced

WD_CFG register (0x2B) with TBSGAIN reg-

ister.

Set GPIO11 as tri-state when EEPROM boot

completed

After

stand-alone

boot

from

EEPROM,

GPIO11 (acting as EEPROM chip select) was

previously driven high. This pin now tri-states

with an internal pull-up to hold it high.

Modified Test Bit Stream (TBS) to disable

loopback when TBS disabled.

If TBS loopback mode was enabled, the exter-

nal MDATA inputs were disconnected from the

SINC filter even if the TBS was disabled. Now

when the TBS is disabled, loopback mode is

automatically disabled also.

Added Test Bit Stream (TBS) impulse mode.

TBS can now operate in sine wave or impulse

mode, depending on bit 15 in the TBSCFG reg-

ister. When impulse mode is enabled (TBSCFG

bit 15 = 1), a rising edge on the TIMEB pin

causes the TBS to output an impulse bitstream.

When sine wave mode is enabled (TBSCFG bit

15 = 0), operation is identical to CS5376 revi-

sion A/B.

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