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ES9219 Datasheet

February 27, 2020

CONFIDENTIAL ADVANCE INFORMATION 1.0.4

ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA Tel (408) 643-8800 • Fax (408) 643-8801

THD Compensation

THD Compensation minimizes the non-linearity of the DAC output resistors and to a lesser degree the non-linearity of passive components in the

output stage.

Non-linearity of the DAC output resistors can lead to output distortion in two ways:

1. Amplitude modulation of the output current from the DAC

2. Gain modulation of the output stage as the output impedance of the DAC swings with the audio signal

The ES9219 includes models for its output resistors and can compensate for their characteristic curve by finely adjusting the DAC codes for large

and small signal amplitudes.

THD compensation can be enabled via bypass_thd in Register 13: THD BYPASS & MONO_MODE

The coefficient for manipulating second harmonic distortion is stored in Register 22-23: THD COMPENSATION C2

The coefficient for manipulating third harmonic distortion is stored in Register 24-25: THD COMPENSATION C3

Left and right channels use the same compensation coefficients unless

enable_seperate_thd_comp in Register 48: ANALOG CONTROL

SIGNALS is used.

CrossTalk Compensation

The ES9219 has registers built in to add (or subtract) a signed number from Ch1 to Ch2 and vice versa. This is to help mitigate the

crosstalk between channels induced by the device or system.

See Register 128: CROSSTALK COMPENSATION CONFIG & Register 130-131: CROSSTALK SCALE CH1 for more details.

Figure 6: Diagram shows crosstalk compensation configuration

MQA Rendering

The ES9219 is a licensed MQA hardware renderer.

Enabling the MQA renderer is from Register 146: MQA CONFIG, and to check if the stream is locked query Register 77: READ LOCK STATUS.

ESS079 Crosstalk Compensation

Ch1

Ch2

Signed Scale for Ch2,

Signed Scale for Ch1,

Ch1

Compensated

Ch2

Compensated

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