ES9842PRO datasheet(12/167 Pages) ESS

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CONFIDENTIAL ADVANCE INFORMATION

ES9842 PRO Product Datasheet

VERSION 0.5

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

Digital Features

Digital Signal Path

SABRE ADC DIGITAL PATH (2 CHANNEL)

VOLUME

CONTROL

-32

Distortion

Compensation

ADC

DATA

Block

IIR

128xFS

IIR

8xFS

CLIP

DETECTION

TDM/I2S/

DSD/SPDIF

DFIR

1xFS

ASP

FORMATTING

x1, x2, x4

GAIN

I2S Decoder

Programmable Delay

Figure 3 - Digital signal path

Distortion Compensation3

Distortion Compensation minimizes the non-linearities of the ADCs. The ES9842 PRO can help compensate for system

second and third harmonic distortion. For best results, compensation coefficients should be tuned for each device in-situ.

THD compensation can be enabled or bypassed by setting ADCx_ENABLE_THD_COMP for each channel.

THD Compensation Enable Registers

• Register 102[0]: ADC1_ENABLE_THD_COMP

• Register 119[0]: ADC2_ENABLE_THD_COMP

• Register 136[0]: ADC3_ENABLE_THD_COMP

• Register 153[0]: ADC4_ENABLE_THD_COMP

Ask your FAE or distributor for the Distortion Compensation application note.

Volume Control

This volume control is intended for use during audio playback. Each channel can be digitally attenuated from 0dB to –84dB

in 0.5dB steps. The attenuation circuit automatically uses micro-stepping between 0.5dB register settings so that no

switching noise occurs during the volume control transition. When a new volume level is set, the attenuation circuit will ramp

softly to the new level. Each 0.5dB step takes up to 64 intermediate steps depending on the CHx VOLUME RATE setting.

Volume Level Configuration Registers

• Register 109-110: ADC CH1 VOLUME

• Register 126-127: ADC CH2 VOLUME

• Register 143-144: ADC CH3 VOLUME

• Register 160-161: ADC CH4 VOLUME

For more information on using Distortion Compensation, please reference the Distortion Compensation Application Note.

Available from your local FAE upon request.

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