3.2

March 26, 2021

ES9016K2M Datasheet

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

8800 • www.esstech.com

6

FEATURE DESCRIPTION

Soft Mute

When Mute is asserted the output signal will ramp to the -

 level. When Mute is reset the attenuation level will ramp back up

to the previous level set by the volume control register. Asserting Mute will not change the value of the volume control

register. The ramp rate is 0.0078125 x fs / 2(vol_rate-5) dB/s.

Automute

During an automute condition the ramping of the volume of each DAC to -

 can now be programmatically enabled or

disabled.

o

In PCM serial mode, “AUTOMUTE” will become active once the audio data is continuously below the threshold set by

<Register Automute_lev>, for a length of time defined by 2096896 / (<Register#4> x 64 x fs) seconds.

o

In SPDIF mode, “AUTOMUTE” will become active once the audio data is continuously below the threshold set by

<Register Automute_lev>, for a length of time defined by 2096896 / (<Register#4> x (64 x fs) seconds.

o

In the DSD Mode, “AUTOMUTE” will become active when any 8 consecutive values in the DSD stream have as many 1’s

and 0’s for a length of time defined by 2096896 / (<Register Automute_time> x DATA_CLK) seconds. The following

table summarizes the conditions.

Mode

Detection Condition

Time

PCM

Data is continuously lower than

<Register Automute_lev >

2096896 / (<Register Automute_time > x 64 x fs)

SPDIF

Data is continuously lower than

<Register Automute_lev >

2096896 / (<Register Automute_time > x (64 x fs))

DSD

Equal number of 1s and 0s in every 8

bits of data

2096896 / (<Register Automute_time > x DATA_CLK)

Volume Control

Each output channel has its own attenuation circuit. The attenuation for each channel is controlled independently. Each

channel can be attenuated from 0dB to

–127dB in 0.5dB steps.

Each 0.5dB step transition takes up to 64 intermediate levels, depending on the vol_rate register setting. The result being

that the level changes are done using small enough steps so that no switching noise occurs during the transition of the

volume control. When a new volume level is set, the attenuation circuit will ramp softly to the new level.

Master Trim

The master trim sets the 0dB reference level for the volume control of each DAC. The master trim is programmable via

registers 17-20 and is a 32bit signed number. Therefore it should never exceed 32'h7FFFFFFF (as this is full-scale signed).

All Mono Mode

An all mono mode where all DACs are driven from the same source is supported. This can be useful for high-end audio

applications. The source data for all DACs can be programmatically configured to be either CH1 or CH2.

De-emphasis

The de-emphasis feature is included for audio data that has utilized the 50/15

s pre-emphasis for noise reduction. There are

three de-emphasis filters, one for 32kHz, one for 44.1kHz, and one for 48kHz.

SPDIF Data Select

An SPDIF source multiplexer allows for up to four SPDIF sources to be connected to the data pins. An internal

programmable register (spdif_sel) is used to select the appropriate data or GPIO pin to decode. SPDIF can also be sourced

from GPIO pin configured as input.