ES9842PRO datasheet(33/167 Pages) ESS

33 / 167 page

VERSION 0.5

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

ES9842 PRO Product Datasheet

64FS Mode

When 64FS (MCLK/FS ratio) is required, it is necessary for the ES9826 to be running in 64FS Mode. 64FS Mode can be

manually entered by setting Register 0[3] ENABLE_64FS_MODE to 1’b1.

• Register 0[3] ENABLE_64FS_MODE

Use for 64FS ratios, including 705.6/768kHz sample rates

This mode enables the Minimum phase 64FS filter. See filter properties below.

Note: 64FS mode is not supported in Hardware mode (HW).

Minimum Phase 64FS Latency

The following table shows the simulated latency at 705.6kHz sampling rate. The latency was measured at the peak

amplitude of the impulse response prior to being down-sampled to 1FS. Latency delay will reduce (scale) with sampling

rate.

Digital Filter

Delay(us) @

fs= 705.6 kHz

Minimum Phase 64FS

9.2 us

Table 7 – Minimum Phase 64FS Delay

Minimum Phase 64FS Properties

Minimum Phase 64FS

Parameter

Conditions

MIN

TYP

MAX

UNIT

Pass band

-3 dB

0.55 x fs

Stop band

-100 dB

0.91 x fs

Group Delay

2.24/fs

4.03/fs

Flatness (ripple)

Table 8 – Minimum Phase 64FS Properties

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