ES9028PRO datasheet(19/57 Pages) ESS

19 / 57 page

July 6, 2020

CONFIDENTIAL INFORMATION v3.6

ES9028PRO 32-Bit HyperStream® II 8-Channel Audio DAC

ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA. Tel (408) 643-

8800 • Fax (408) 643-8801

Bits

[7]

[6]

[5:4]

[3]

[2:0]

Mnemonic

auto_deemph

deemph_bypass

deemph_sel

reserved

volume_rate

Default

1’b0

1’b1

2’b00

1’b1

2’b010

Bit

Mnemonic

Description

[7]

auto_deemph

Automatically engages the de-emphasis filters when SPDIF data is

provides and the SPDIF channel status bits contains valid de -

emphasis settings.

•

1’b1: enables automatic de-emphasis

•

1’b0: disables automatic de-emphasis (default)

[6]

deemph_bypass

Enables or disables the built-in de-emphasis filters.

•

1'b1 disabled de-emphasis filters (default)

•

1'b0 enables de-emphasis filters

[5:4]

deemph_sel

Selects which de-emphasis filter is used.

•

2’b11: reserved

•

2’b10: 48kHz

•

2’b01: 44.1kHz

•

2’b00: 32kHz (default)

[3]

reserved

Must be set to 1’b1 (default) for normal operation

[2:0]

volume_rate

Selects a volume ramp rate to use when transitioning between

different volume levels. The volume ramp rate is measured in decibels

per second (dB/s). Volume rate is in the range 0-7.

rate =

2vol_rate ∗ FSR

512

dB/s

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