ES9028PRO datasheet(8/57 Pages) ESS

8 / 57 page

CONFIDENTIAL INFORMATION v3.6

July 6, 2020

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

Function 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 set by Register 6: De-emphasis Filter & Volume Ramp Rate according to the following relationship:

rate =

2vol_rate ∗ FSR

512

dB/s

Automute (PCM and SPDIF modes only)

Automute is disabled by default and can be enabled by setting automute_time to a non-zero value. Automute is triggered

when the following conditions are met:

Mode

Detection Condition

Time

PCM

SPDIF

Data is lower than automute_level

for the specified time

2096896

automute_time ∗ FSR

(s)

Automute_time can be set using Register 4: Automute Time.

Automute_level can be set using Register 5: Automute Level.

The automute status can be read using automute_status in Register 64: Chip ID and Status or via a GPIO pin

programmed as Automute Status using Register 8: GPIO1-2 Configuration or Register 9: GPIO3-4 Configuration.

The triggered automute behavior can be configured using Register 2: Serial Data Configuration and Automute Enable to one

of the followings:

•

No action

•

Soft Mute

•

Ramp all channels to ground to reduce power consumption

•

Soft Mute then ramp all channels to ground

The ramp-to-ground rate can be configured to

4096 ∗

2(soft_start_time+1)

MCLK

using Register 14: Soft-Start Configuration.

Volume Control

Each channel has an independently controlled digital attenuation circuit which can be set to attenuate from 0dB to

–127dB in

0.5dB steps. When a new volume level is set, the digital attenuation circuit will ramp softly to the new level. To ensure silent

digital volume transitions each 0.5dB step can take as many as 64 intermediate steps depending on the volume_rate setting

in Register 6: De-emphasis Filter & Volume Ramp Rate.

Master Trim

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

via Register 24-27: Master Trim. The master trim registers store a 32bit signed number and should never exceed the full

scale signed value 32’h7FFFFFFF.

18dB Channel Gain (PCM mode only)

A +18dB gain can be applied on a per-channel based using Register 62: +18dB Channel Gain, in addition to volume control

and master trim. Note that the output will be clipped if the +18dB gain results in larger than full scale output.

ES9028PRO 数据表(PDF) 8 Page - ESS Technology,Inc

ES9028PRO 数据表(HTML) 8 Page - ESS Technology,Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

数据表下载