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CS5361 Arkusz danych(PDF) 9 Page - Cirrus Logic

Numer części CS5361
Szczegółowy opis  111 dB, 192 kHz, Multi-Bit Audio A/D Converter
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS5361
9
3.5
High Pass Filter and DC Offset Calibration
The operational amplifiers in the input circuitry driving the CS5361 may generate a small DC offset into
the A/D converter. The CS5361 includes a high pass filter after the decimator to remove any DC offset
which could result in recording a DC level, possibly yielding "clicks" when switching between devices in
a multichannel system.
The high pass filter continuously subtracts a measure of the DC offset from the output of the decimation
filter. If the HPF pin is taken high during normal operation, the current value of the DC offset register is
frozen and this DC offset will continue to be subtracted from the conversion result. This feature makes it
possible to perform a system DC offset calibration by:
1) Running the CS5361 with the high pass filter enabled until the filter settles. See the Digital Filter Char-
acteristics for filter settling time.
2) Disabling the high pass filter and freezing the stored DC offset.
A system calibration performed in this way will eliminate offsets anywhere in the signal path between the
calibration point and the CS5361.
3.6
Overflow Detection
The CS5361 includes overflow detection on both the left and right channels. This time multiplexed infor-
mation is presented as open drain, active low on pin 15, OVFL. The OVFL_L and OVFL_R data will go
to a logical low as soon as an overrange condition in either channel is detected. The data will remain low
VQ
10 k
10 k
+
634
634
91
91
+
-
-
2700 pF
470 pF
470 pF
COG
COG
100 uF
100 uF
CS5361 AIN+
CS5361 AIN-
AIN+
AIN-
COG
Figure 3. CS5361 Recommended Analog Input Buffer


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