[经验] TI的 G类耳机放大器TLV320DAC3202

TI 公司的TLV320DAC3202是集成了DAC和电源的高保真高效低功耗G类耳机放大器，静态功耗6.5mW的通路 SNR为100dB（A），内置了短路保护，支持8-, 11.025-, 12-, 16-, 24-, 32-, 44.1和48-kHz取样频率，数字控制I2C接口，支持16,20,24和32位数据宽度，32步音量控制，从4dB到-59dB,主要用在智能手机和音乐手机，手持导航仪，PMP和PDA,手持游戏机，HDD和基于闪存的手持音频播放器。本文介绍了TLV320DAC3202主要特性，功能方框图，典型应用电路和TLV320DAC3202EVM评估板主要特性，电路图和材料清单。

    The TLV320DAC3202 is a high fidelity and low power headphone amplifier with integrated DAC and power rails. The small solution size and highly efficient operation maximizesbattery life and performance. The digital audio interface supports industry standard formats such as I2S and PCM. Many features of this device such as volume setting, data width and sampling rate are configurable for optimum flexibility and efficiency. The headset power control automatically adjusts the rail voltage based on the input signal to maximize efficiency and performance. The control interface uses an industry standard I2C controller for ease of operation and reduction in device pin count.

    TLV320DAC3202主要特性：

    Ground Referenced Click-Pop Free Class-G Stereo Headset Driver

    Capable of Driving 1 VRMS at the Headset Driver Output, Per Channel, in Phase

    100-dB(A) Channel SNR With 6.5-mW of Quiescent Power Dissipation

    Built In Short-Circuit Protection for Preventing Supply Rails Overload

    Supports 8-, 11.025-, 12-, 16-, 24-, 32-, 44.1- and 48-kHz Sample Rates

    I2C Interface for Digital Control

    Supports 16-, 20-, 24- and 32-Bit Data Width

    Supports Standard I2S, PCM, Left and Right Justified Formats

    Supports Data Mixing With Gain Options

    32-Step Volume Control from 4 to –59 dB

    Clocking: Internal Clock Derived from I2S BCLK

    Package: WCSP, 0.5 mm Pitch, 2 mm × 2.5 mm

    Power Supply: Direct Battery and IO Supply

    TLV320DAC3202应用：

    Smart Phones and Music Phones

    Portable Navigation

    Personal Media Players

    PDAs

    Portable Game Consoles

    HDD and Flash-Based Portable Audio Players

图1。TLV320DAC3202功能方框图

图2。TLV320DAC3202典型应用电路

    TLV320DAC3202EVM评估板
The TLV320DAC3202EVM provides a simplified platform to evaluate the performance and functionality of the TLV320DAC3202 low-power headset IC. A complete circuit description, schematic diagram, and bill of materials are included.

    TLV320DAC3202EVM评估板主要特性：

    A USB stick version of the TLV320DAC3202EVM for easy operation

    USB connection to PC provides ability to stream audio data for evaluation

    Power to TLV320DAC3202 can be supplied from a PC USB connection, or an external battery by changing the jumper connection

    A 3.5-mm jack can be connected to a headphone for listening tests or to a cable connected to an instrument for performance verifications

    Pre-programmed EEPROM boots TLV320DAC3202 as a USB audio device when connected to a PC

    Use generated wave files (.wav) to evaluate total harmonic distortion (THD), crosstalk between channels, ICN, dynamic range, or amplitude

图3。TLV320DAC3202EVM评估板外形图：顶层

图4。TLV320DAC3202EVM评估板外形图：底层

图5。TLV320DAC3202EVM评估板电路图

TLV320DAC3202EVM评估板材料清单（BOM）：

    TLV320DAC3202

    【用 途】     G类耳机放大电路

     特点：

    ·支持100dB信噪比（SNR）与业界最低功耗；SNR比业界标准高3到4dB,功耗仅为6.5mW；

    ·TPS62044的高效电源管理技术可实现电池与开关模式输入电压电源之间的无缝工作，即便在输入电压电流预算极低的系统中也可实现高效回放；

    ·单位通道SNR为100dB时，出色的电源抑制比（PSRR）可实现直接通过高效异步开关模式输入电压电源供电，无需电源线性稳压器；

    ·与主要同类竞争产品相比，创新电路技术可将噼啪咔嗒杂音锐减50%;

    ·采用TI130纳米模拟工艺技术与电路技术实现的2毫米x2.5毫米封装可最大限度地降低整体材料清单成本与解决方案尺寸/成本。