ES9080 datasheet(12/146 Pages) ESS

12 / 146 page

CONFIDENTIAL ADVANCE INFORMATION 0.4.3

ES9080 Product Datasheet

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

THD Compensation

The ES9080 has built-in THD compensation to help compensate for second and third harmonics that may be present on the output signal. The

compensation is controlled through 4 individual 16-bit coefficients in the THD Compensation Coefficient Registers.

Using THD Compensation for differential mode (4 channel mode) where Channels 1&2, 3&4, 5&6, 7&8 are paired to create 4 differential channels,

THD coefficients need to be the same for each pair. Therefore, C2 & C3 would be the same for all channels.

The following equation displays how the second and third harmonics are affected by the C2 and C3 values:

�� = �� + ��2 ∗ ��2 + ��3 ∗ ��3

THD Compensation Coefficient Registers

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Registers 111-112: THD COMP C2 CH1/3/5/7

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Registers 113-114: THD COMP C3 CH1/3/5/7

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Registers 115-116: THD COMP C2 CH2/4/6/8

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Registers 117-118: THD COMP C3 CH2/4/6/8

Dynamic Range Enhancement (DRE)2

The DRE controller is composed of a peak detector with a programmable rate. If the input audio stream peak level decays below the DRE ON

THRESHOLD value, the controller will attenuate the analog gain by 16.37 dB, while simultaneously increasing the digital gain by the value of DRE

GAIN CHx/x/x/x. DRE will remain engaged until the input audio stream peak level rises above the DRE OFF THRESHOLD value. The rate at which

the peak level decay is determined by DRE DECAY RATE.

Control over various device functions is given to the DRE peak filter through the DRE ATT EN AND THDR CTRL registers. Once configured, the

DRE FORCE registers may be configured to enable DRE on the desired channels.

The DRE peak filter is disabled by default and is enabled by setting the PEAK FILTER bit.

DRE Configuration Registers

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Note: Some implementations of DRE may experience a pop noise due to a possible small DC level change between DRE transitions, in particular

when used with external output stage.

For more information regarding the DRE Peak Filter, please reference the DRE Configuration application note. Available from your local FAE upon

request.

ES9080 Datasheet(PDF) 12 Page - ESS Technology,Inc