ES9039Q2M datasheet(32/107 Pages) ESS

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VERSION 0.2.2

ES9039Q2M Product Datasheet

ESS TECHNOLOGY, INC. 109 Bonaventura Drive, San Jose, CA 95134, USA Tel (408) 643-8800 • WWW.ESSTECH.COM

Digital Filters

The ES9039Q2M has 8 pre-programmed digital filters. The latency for each filter reduces (scales) with increasing sample

rates. (See Register 88[2:0] FILTER_SHAPE for configuration)

Filter

Description

Minimum Phase (default)

Version 2 of minimum phase fast roll-off (#5) with less ripple and more image

rejection

Linear Phase Apodizing Fast

Roll-Off

Full image rejection by FS/2 to avoid any aliasing, with smooth roll-off

starting before 20k.

Linear Phase Fast Roll-Off

Sabre legacy filter, optimized for image rejection @ 0.55FS

Linear Phase Fast Roll-Off

Low-Ripple

Sabre legacy filter, optimized for in-band ripple

Linear Phase Slow Roll-Off

Sabre legacy filter, optimized for lower latency, but symmetric impulse

response

Minimum Phase Fast Roll-Off

Low latency, minimal pre ringing and low passband ripple, image rejection @

0.55FS

Minimum Phase Slow Roll-Off

Lowest latency at the cost of image rejection

Minimum Phase Fast Roll-Off

Low Dispersion

Provides a nice balance of the low latency of minimum phase filters and the

low dispersion of linear phase filters. Minimal pre-ringing is added to

achieve the low dispersion in the audio band.

Table 17 - Pre-Programmed Digital Filter Descriptions

Note: Minimum phase filters are asymmetric filters that work to minimize the pre-echo of the filter, while still maintaining an

excellent frequency response and they peak earlier than linear phase filters, resulting in a lower group delay. Minimum

phase filters usually feature zero cycles of pre-echo, which can result in improved audio quality.

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