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PCM5102A: 外接一个4欧/3W的纸盆喇叭,输出音量很小

Part Number: PCM5102A
Other Parts Discussed in Thread: TPA6404-Q1

我使用3线制I2S接口接入pcm5102A,单声道输出,音频数据是1khz的正弦波

当不外接喇叭时,示波器检测LROUT引脚输出能到达最高电压,即3.3v

当外接喇叭时,示波器检测喇叭正负极,最高电压只有几十mv,输出音量也很小

请问是需要pcm5102A驱动能力不足导致的吗,外接喇叭的话是否需要接功放电路,如果需要的话,请问有什么具体的方案?