【应用】全差分功率放大器SGM4895YPMS8,用作智能语音中继的音频功放
随着无线智能产品的推广,越来越多的智能传感器和智能开关等产品被接入家庭网络,而低功耗的智能传感器,主要采用zigbee的通信方式。下面介绍的就是一款将zigbee信号转换为WiFi信号并上传到云端的智能语音中继产品。该智能语音中继上的音频功放采用圣邦微(SGMICRO)全差分功率放大器SGM4895YPMS8。
产品框图如下:
产品PCB图:
SGM4895YPMS8原理图:
SGM4895YPMS8支持采用单端输入的方式或差分输入的方式,如果采用单端输入,贴C70和C77电容,C71不贴。如果采用差分输入,贴C70和C71电容,C77不贴。
主控采用全志 ARM Cortex™-A7 R11芯片,主控芯片音频相关电路:
设计经验:
1. SHDN_N管脚必要串联一个10K电阻到控制IO口,保护该引脚免受外部过压损坏。
2. 优化音频POP音经验
在调试过程中发现,语音播放开始时会有轻微的POP音。经分析是由于隔直电容(C70,C71)快速充电导致的。充电过程越迅速,pop noise浪涌越高,降低pop noise浪涌,也就减低了pop noise干扰,就需要延迟充电过程,也就是让隔直电容被缓慢充电。
在这里,我们通过软件优化,SPK-SHDN信号由最初的直接从0到1,变为把SPK-SHDN信号控制输入一连串1010101010。。。(约40ms),让PA开关开关一会,最后维持1,这样就延长了隔直电容(C70,C71)充电时间,使pop noise降低到可接受的范围内。
圣邦微 SGM4895YPMS8 温度范围达到扩展的工业标准-40℃到+85℃,关断电流仅为0.05μA,具有高电源/稳压器抑制比,低失真等特点,广泛应用于移动电话、MP3/MP4、可穿戴产品及智能家居产品中。选型时推荐优先考虑。
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富满电子(FM)音频功放系列芯片选型指南
描述- 富满微电子集团股份有限公司创立于2001年,是一家致力于高性能模拟及数模混合集成电路设计研发、封装、测试、销售为一体的国家级高新技术企业及国家规划布局内重点集成电路设计企业、2017年7月5日在深交所创业板上市。
型号- TC8002D,FM8002E,SC2313LX,FM8002A,TC6805,SC2314X,TC8871,TC2018,SC8002B,TC4863X
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可定制波导隔离器频率覆盖5.5GHz~110GHz,插损损低至0.25dB、隔离度、正向方向功率、封装尺寸参数。
最小起订量: 1pcs 提交需求>
提供全面表征产品器件耗电特征及功耗波形、快速瞬态效应、电源优化、表征和仿真测试服务,使用直流电源分析仪测量精度达50µV,8nA,波形发生器带宽100kHz,输出功率300W,示波器200kHz,512 kpts
实验室地址: 深圳/苏州 提交需求>
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