ES9018K2M：高保真音频DAC芯片技术详解

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"ES9018K2M是一款由ESS Technology公司生产的高保真HIFI音频数模转换器(DAC)芯片，以其卓越的性能和低功耗特性在音频领域备受关注。" ESS9018K2M是专为移动音频设备设计的32位超高速DAC芯片，它具有以下主要特点： 1. **专利32位Hyperstream DAC技术**：此技术确保了127分贝的信噪比(DNR)和-120分贝的总谐波失真加噪声(THD+N)。这代表了业界领先的音频性能，提供了无与伦比的动态范围和极低的失真，保证了音质的高度纯净。 2. **时间域抖动消除器**：ESS9018K2M内置的专利时间域抖动消除器能有效地从输入时钟抖动中恢复音频信号，提供无与伦比的音质清晰度，确保音频播放不受干扰。 3. **64位累加器和32位处理能力**：这种强大的处理能力确保了失真免费的信号处理，保证音频信号在整个处理过程中的准确性和完整性。 4. **集成数字信号处理器(DSP)功能**：芯片内建了如无点击软静音、可编程零检测、32kHz、44.1kHz和48kHz采样率的去加重等功能，以满足各种音频处理需求。 5. **自定义输出配置**：根据性能标准，用户可以选择单声道或立体声输出模式，并可在电流或电压模式之间切换。 6. **I2C控制**：通过I2C接口，可以方便地对DAC的各项特性进行软件控制，提供了极大的灵活性。 7. **紧凑的封装和低功耗设计**：采用28-QFN封装（5mm x 5mm），减小了电路板空间占用。运行功率小于40毫瓦，待机功率小于1毫瓦，优化了电池寿命，适用于便携式设备。 8. **多样的数字输入兼容性**：芯片支持多种数字输入，适应不同的音频源设备。 ESS9018K2M是为追求极致音质的音频设备设计的一款高性能、低功耗的DAC芯片，适合于高端耳机、音频播放器、手机以及其他便携式音乐系统。其独特的技术特性和优化的电源管理，使其在音频行业中处于领先地位。

CONFIDENTIAL ADVANCE INFORMATION Rev. 0.9 July 30, 2013

ES9018K2M Datasheet

ESS TECHNOLOGY, INC. 48401 Fremont Blvd., Fremont, CA 94538, USA Tel (510) 492-1088 • Fax (510) 492-1098

FEATURE DESCRIPTION

Soft Mute

When Mute is asserted the output signal will ramp to the -∞ level. When Mute is reset the attenuation level will ramp back up

to the previous level set by the volume control register. Asserting Mute will not change the value of the volume control

SPDIF sampling rate in SPDIF mode.

Automute

During an automute condition the ramping of the volume of each DAC to -∞ can now be programmatically enabled or

disabled.

o In PCM serial mode, “AUTOMUTE” will become active once the audio data is continuously below the threshold set by

<Register Automute_lev>, for a length of time defined by 2096896/(<Register#9>*DATA_CLK) Seconds.

o In SPDIF mode, “AUTOMUTE” will become active once the audio data is continuously below the threshold set by

<Register Automute_lev>, for a length of time defined by 2096896/(<Register#9>*(64*Fs) Seconds, where Fs is the

SPDIF sampling rate.

o In the DSD Mode, “AUTOMUTE” will become active when any 8 consecutive values in the DSD stream have as many 1’s

and 0’s for a length of time defined by 2096896/(<Register Automute_time>*DATA_CLK) Seconds. The following table

summarizes the conditions.

Mode Detection Condition Time

PCM Data is continuously lower than

2096896/(<Register Automute_time >*DATA_CLK)

SPDIF Data is continuously lower than

2096896/(<Register Automute_time >*(64*Fs))

where Fs is the SPDIF sampling rate

DSD Equal number of 1s and 0s in every 8

bits of data

2096896/(<Register Automute_time >*DATA_CLK)

Volume Control

Each output channel has its own attenuation circuit. The attenuation for each channel is controlled independently. Each

channel can be attenuated from 0dB to –127dB in 0.5dB steps.

Each 0.5dB step transition takes up to 128 intermediate levels, depending on the vol_rate register setting. The result being

that the level changes are done using small enough steps so that no switching noise occurs during the transition of the

volume control. When a new volume level is set, the attenuation circuit will ramp softly to the new level.

Master Trim

The master trim sets the 0dB reference level for the volume control of each DAC. The master trim is programmable via

registers 20-23 and is a 32bit signed number. Therefore it should never exceed 32'h7FFFFFFF (as this is full-scale signed).

All Mono Mode

An all mono mode where all DACs are driven from the same source is supported. This can be useful for high-end audio

applications. The source data for all DACs can be programmatically configured to be either CH1 or CH2.

De-emphasis

The de-emphasis feature is included for audio data that has utilized the 50/15uS pre-emphasis for noise reduction. There are

3 de-emphasis filters, one for 32 kHz, 44.1 kHz and 48 kHz.

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ES9018K2M：高保真音频DAC芯片技术详解

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ES9018K2M DAC芯片如何通过I2C接口进行配置，以实现定制化的音频输出设置？

如何通过I2C接口编程ES9018K2M DAC芯片，以便根据特定的音频播放需求配置输出模式和工作模式？

在设计便携式音频设备时，如何通过软件和硬件配置ES9018K2M DAC芯片以达到高保真音频播放的效果？

如何在便携式音频设备中应用ES9018K2M DAC芯片以实现高保真音频播放？

如何通过硬件和软件配置优化ES9018K2M DAC芯片，以提升便携式音频设备的音频性能并实现低功耗？

如何通过I2C接口对ES9018K2M DAC芯片进行编程，以实现特定的音频输出配置，例如从立体声输出切换到单声道输出，并调整到电流输出模式？

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