ES9039Q2M datasheet(45/107 Pages) ESS

45 / 107 page

VERSION 0.2.2

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

ES9039Q2M Product Datasheet

64FS Mode

When 64FS (MCLK/FS ratio) is required, it is necessary for the ES9039Q2M to be running in 64FS Mode. 64FS Mode can

be manually entered by setting ENABLE_64FS_MODE to 1’b1, overriding the AUTO_FS_DETECT logic.

If using automatic sample rate detection with AUTO_FS_DETECT, 64FS Mode can be automatically accessed, unless

AUTO_FS_DETECT_BLOCK_64FS is set to 1’b1.

Software Registers

• Register 0[6] ENABLE_64FS_MODE

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

• Register 3[7] AUTO_FS_DETECT

1’b0: Manually set sample rate with Register 1[6:0]

1’b1: Automatically determine the sample rate (default)

• Register 5[0] AUTO_FS_DETECT_BLOCK_64FS

1’b0: Allows AUTO_FS_DETECT to enter 64FS Mode (default)

1’b1: Blocks AUTO_FS_DETECT from entering 64FS mode

This mode enables the Minimum Phase 64FS filter. See filter properties.

Minimum Phase 64FS Mode Latency

The following table shows the simulated latency at 705.6kHz sampling rate and is scaled at 768kHz. The measurement was

taken from the external impulse response. The extra sample delay to get the data encoded accounts for external processing

time to serialize the data stream. Latency delay will reduce (scale) with sampling rate.

Digital Filter

Delay(us) @

FS = 705.6 kHz

Minimum Phase Double Rate

8us

Table 22 - Minimum Phase 64FS Latency

Minimum Phase 64FS Properties

Minimum Phase 64FS Mode

Parameter

Conditions

MIN

TYP

MAX

UNIT

Pass band

-3dB

0.45FS

Stop band

-61dB

0.68FS

Group Delay

1.55/FS

2.35/FS

Flatness (ripple)

Table 23 - Minimum Phase 64FS Properties

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