ES9028PRO datasheet(37/57 Pages) ESS

37 / 57 page

July 6, 2020

CONFIDENTIAL INFORMATION v3.6

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

Bits

[7]

[6]

[5]

[4]

[3]

[2]

[1:0]

Mnemonic

calib_en

calib_sel

calib_latch

reserved

Default

1’b0

1’b1

2’b10

Bit

Mnemonic

Description

[7]

calib_en

Enables master trim calibration via the ADC input.

•

1’b0: Disables master trim auto calibration (default)

•

1’b1: Enables master trim auto calibration

[6]

calib_sel

Selects which ADC input is used for the master trim calibration.

•

1’b0: reserved

•

1’b1: Uses ADC2 (GPIO1)

[5]

calib_latch

Continues updating the calibration routine while set to 1’b1.

[4]

reserved

[3]

reserved

[2]

reserved

[1:0]

reserved

Bits 3:2 of this register need to be written as 2’b10 to ensure the noise shaped modulator is stable under all conditions. If

these bits are not set the noise shaped modulator can be unstable. Although the ES9028PRO will continue to function

normally the noise floor will be degraded.

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