TI TLV320DAC3100: 低功耗音频D/A转换器与数字处理技术详解

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TI-TLV320DAC3100是一款针对低功耗音频应用的多功能数字模拟转换器(DAC)，它在音频处理和单声道类-DSpeaker放大器方面表现出色。该设备的主要特点包括： 1. **高保真度**：TLV320DAC3100提供了95分贝的信噪比（SNR），确保了音频信号的清晰度和纯净度。 2. **宽广的采样率支持**：它兼容8千赫兹到192千赫兹的多种采样率，适应不同音频源的输入需求，适用于各种音频播放场景。 3. **音频输出能力**：设备内置一个2.5瓦或1.6瓦的单声道类-D音箱驱动器，支持4欧姆或8欧姆阻抗，满足不同负载下的音频输出。 4. **多通道输入**：拥有两个单端输入，具备混合功能，并提供输出电平控制，便于音频信号的合成和调整。 5. **多种输出选项**：除了立体声耳机/线路输出外，还有单声道类-D音箱输出，以及用于监听的接口。 6. **内置音频处理功能**：内置25个数字音频处理块（PRB_P1至PRB_P25），可实现各种滤波器（如biquad和FIR滤波）、动态范围控制器（DRC）和三维结构处理，增强了音频质量与动态效果。 7. **数字混音技术**：支持数字混音，能够灵活地结合多个音频源，便于音频信号的实时处理。 8. **控制灵活性**：通过Pin Controlor Register提供数字播放时的音量控制设置，便于用户个性化定制。 9. **辅助功能**：内置数字正弦波发生器，可用于产生提示音或按键点击音，提升用户体验。 10. **安全性和法律声明**：文档末尾包含重要的注意事项，涉及产品可用性、保修政策、在安全关键应用中的使用限制、知识产权声明及其它免责声明，确保用户在实际应用中的合规性和风险意识。这款TLV320DAC3100旨在为音频系统设计师提供强大的性能和灵活性，尤其适合需要高质量音频输出和音频处理功能的应用，例如便携式音频设备、家用音频系统和汽车音响等。开发者在使用时应确保了解并遵循所有相关注意事项，以确保产品的可靠性和性能。

I − Current − mA

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

V − Voltage − V

G016

Micbias = 2 V

Micbias = 2.5 V

Micbias = AVDD (3.3 V)

f − Frequency − kHz

−160

−140

−120

−100

−80

−60

−40

−20

0 5 10 15 20

Amplitude − dBFS

G008

AVDD = HPVDD = 3.3 V

IOVDD = SPKVDD = 3.3 V

DVDD = 1.8 V

f − Frequency − kHz

−160

−140

−120

−100

−80

−60

−40

−20

0 5 10 15 20

Amplitude − dBFS

G009

AVDD = HPVDD = 3.3 V

IOVDD = SPKVDD = 3.3 V

DVDD = 1.8 V

TLV320DAC3100

SLAS671C –FEBRUARY 2010–REVISED JANUARY 2017

www.ti.com

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Product Folder Links: TLV320DAC3100

4.12.3 Analog Bypass Performance

Figure 4-13. Amplitude vs Frequency

FFT - Line-In Bypass to Line Output

Figure 4-14. Amplitude vs Frequency

FFT - Line-In Bypass to Headphone Output

4.12.4 MICBIAS Performance

Figure 4-15. Voltage vs Current

MICBIAS

TLV320DAC3100

SLAS671C –FEBRUARY 2010–REVISED JANUARY 2017

www.ti.com

Submit Documentation Feedback

Product Folder Links: TLV320DAC3100

Although not necessary, if the system requires, during shutdown, remove the power supplies in the

reverse order of the above sequence.

6.3.2 Reset

The TLV320DAC3100 internal logic must be initialized to a known condition for proper device function. To

initialize the device to its default operating condition, the hardware reset pin (RESET) must be pulled low

for at least 10 ns. For this initialization to work, both the IOVDD and DVDD supplies must be powered up.

TI recommends that while the DVDD supply powers up, the RESET pin is pulled low.

The device can also be reset via software reset. Writing a 1 into page 0 / register 1, bit D0 resets the

device.

6.3.3 Device Start-Up Lockout Times

After the TLV320DAC3100 is initialized through hardware reset at power up or software reset, the internal

memories are initialized to default values. This initialization takes place within 1 ms after pulling the

RESET signal high. During this initialization phase, no register-read or register-write operation should be

performed on DAC coefficient buffers. Also, no block within the codec should be powered up during the

initialization phase.

6.3.4 PLL Start-Up

Whenever the PLL is powered up, a start-up delay of approximately of 10 ms occurs after the power-up

command of the PLL and before the clocks are available to the codec. This delay is to ensure stable

operation of the PLL and clock-divider logic.

6.3.5 Power-Stage Reset

The power-stage-only reset is used to reset the device after an overcurrent latching shutdown has

occurred. Using this reset re-enables the output stage without resetting all of the registers in the device.

Each of the four power stages has its own dedicated reset bit. The headphone power-stage reset is

performed by setting page 1/ register 31, bit D7 for HPL and by setting page 1 / register 31, bit D6 for

HPR. The speaker power-stage reset is performed by setting page 1 / register 32, bit D7 for SPKP and

SPKM.

6.3.6 Software Power Down

By default, all circuit blocks are powered down following a reset condition. Hardware power up of each

circuit block can be controlled by writing to the appropriate control register. This approach allows the

lowest power-supply current for the functionality required. However, when a block is powered down, all of

the register settings are maintained as long as power is still being applied to the device.

6.3.7 Audio Analog I/O

The TLV320DAC3100 has a stereo audio DAC. The device supports a wide range of analog interfaces to

support different headsets and analog outputs. The TLV320DAC3100 has features to interface output

drivers (8-Ω, 16-Ω, 32-Ω). A special circuit has also been included in the TLV320DAC3100 to insert a

short key-click sound into the stereo audio output. The key-click sound is used to provide feedback to the

user when a particular button is pressed or item is selected. The specific sound of the keyclick can be

adjusted by varying several register bits that control its frequency, duration, and amplitude (see

Section 6.3.10.7).

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