ES9826 datasheet(16/88 Pages) ESS

16 / 88 page

ES9826 Datasheet

VERSION 0.1.2

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

• Register 238-237: PEAK CH1 READ (readback level)

• Register 240-239: PEAK CH2 READ (readback level)

8x FIR decimation filter

Select the decimation filter response from 8 pre-programmed filter shapes (Register 59[4:2] FILTER_SHAPE).

For more information on the filter responses, see Digital Filters section.

THD Compensation

The ES9826 has built-in THD compensation to help compensate for system second and third harmonics that may be

present on the digital output signal. The compensation is controlled through 4 individual signed 16-bit coefficients.

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

Figure 4 – THD Compensation Block Diagram

For best results, the chosen compensation coefficients should be tuned for each system/device in-situ. For reference, the

THD coefficients used on the ESS EVB are C2=0, C3=0, bypassing the THD compensation.

THD Compensation Coefficient Registers

• Registers 51-50: THD_C2_CH1, THD Compensation C2 for Channel 1

• Registers 53-52: THD_C3_CH2, THD Compensation C3 for Channel 1

• Registers 55-54: THD_C2_CH2, THD Compensation C2 for Channel 2

• Registers 57-56: THD_C3_CH2, THD Compensation C3 for Channel 2

Note: Coefficients are 16-bit signed values

ES9826 датащи(PDF) 16 Page - ESS Technology,Inc