ES9219C datasheet(31/67 Pages) ESS

部件名	ES9219C

功能描述	32-bit Stereo Low Power DAC with Headphone Amplifier, Analog Volume Control, and Output Switch

PDF	67 Pages

Scroll/Zoom	100%

制造商	ESS [ESS Technology,Inc]

网页	http://www.esstech.com

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31 / 67 page

ES9219 Datasheet

CONFIDENTIAL ADVANCE INFORMATION 1.0.4

February 27, 2020

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

When a crystal is used with internal DVDD, it is possible for core timing requirements to be violated during chip startup. The following measures

should be taken to ensure default register values are loaded correctly:

1. Use a small decoupling capacitor at the DVDD pin. 1µF maximum is recommended.

2. Consult the crystal vendor to optimize crystal circuitry. The chip has a 2-stage reset pipeline. If the oscillator starts slowly for any reason,

more than two runt-pulses may occur and the reset pipeline will not be sufficient to prevent invalid core timing.

Figure 11. Non-optimal crystal circuitry

3. Perform two hardware resets (RESETB is de-asserted), followed by a software reset.

For a 1µF DVDD de-coupling capacitor:

70µ�� ≤ �� − �� ≤ 100µ��

50µ�� ≤ �� − �� ≤ 150µ��

DVDD should not fall below 1V during ��

�� − ��.

�� − �� ≈ 1.5��

ES9219C 数据表(PDF) 31 Page - ESS Technology,Inc