Cirrus Logic AN270 - Manual (Page 4)

4 AN270REV1
AN270
3. CRD5381 OVERVIEW
The CRD5381 is a 4-channel reference design that combines the CS5381 Analog-to-Digital Converter and CS8421
Asynchronous Sample Rate Converter to create an analog-to-digital conversion system as described in this appli-
cations note. The CRD5381 is essentially a 2-channel design where the 2-channel block has been replicated to cre-
ate the 3
rd
and 4
th
channels. Each 2-channel section includes the required analog input buffer, the CS5381 A/D
converter and the CS8421 Asynchronous Sample Rate converter. The reference design also includes clock gener-
ation, status reporting and the required system reset functions. In addition, the dual CS8421 devices can be config-
ured for a 4-channel Time Division Multiplex (TDM) interface.
The intent of the CRD5381 and supporting documentation is to create a design reference that can be considered a
“cut and paste” reference to create a multi-channel A/D conversion system. Please also refer to the CS5381 and
CS8421 data sheets for specific product information and specifications. These documents are available online at
http://www.cirrus.com. The CRD5381 reference design is also available from Cirrus Logic.
The following are the typical performance specifications that can be expected from a CRD5381-based design.
• Dynamic Range (A-weighted) — 120 dB
• Total Harmonic Distortion + Noise — -110 dB
• Resolution — 16 to 32 bits
• Maximum Downsampling Ratio — 7.5:1
• Minimum Stopband Attenuation — 125 dB
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative.
To find the one nearest to you go to
www.cirrus.com
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