CS5372-BS View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS5372-BS' PDF : 22 Pages View PDF
CS5371/CS5372
When using dual power supplies, it is recommend-
ed to connect the VA- analog supply pin to system
ground using a reversed biased Schottky diode.
This configuration clamps the VA- pin a maximum
of 0.3 V above ground to ensure SCR latch-up does
not occur during power up. If the VA+ supply
ramps before the VA- supply, the VA- pin can be
pulled above ground through the CS5371/CS5372.
If the VA- supply pin is unintentionally pulled
0.7 V above the DGND pin, SCR latch-up can oc-
cur.
9.4. DC-DC Converter Considerations
Many measurement systems are battery powered
and utilize DC-DC converters to generate the nec-
essary supply voltages for the system. To mini-
mize the effects of interference, it is desirable to
operate the DC-DC converter at a frequency which
is rejected by the digital filter, or else synchronous-
ly to the modulator sample clock rate. A synchro-
nous DC-DC converter whose operating frequency
is derived from MCLK minimizes the potential for
‘beat frequencies’ appearing in the measurement
band.
9.5. Power Supply Rejection
Power supply rejection of the CS5371/CS5372
modulators is frequency dependent. The CS5376
digital filter rejects power supply noise for frequen-
cies above the filter corner frequency. For frequen-
cies between DC and the digital filter corner
frequency, power supply rejection is nearly con-
stant at 90 dB.
16
DS255PP2
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