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徒弟:请详细介绍一下T6668语言录放芯片。师傅:T6668采用标准的(60)脚扁平封装,其内部结构框图参见上讲图5,主要包括以下几部分。话筒放大器:由CMOS器件构成。ADM分解合成电路、D/A变换电路:完成模拟信号的分解和数字信号的合成。时钟控制电路:为系统提供工作时钟。DRAM接口:为外部动态存储器(DRAM)提供地址及控制信号。电压跟随及带通滤波器:在数字信号合成时提高语言信号的质量。CPU接口:直接和外部中央微处理器(CPU)连接。 T6668引脚排列参见上一讲图6。其①、②、④、⑤脚CAS_1～CAS_4为第1至第4片动态存储芯片列地址
Apprentice: Please tell us about the T6668 language recording chip. Master: T6668 uses a standard (60) foot flat package, the internal structure of the block diagram shown in Figure 5, including the following sections. Microphone amplifier: CMOS devices. ADM decomposition synthesis circuit, D / A conversion circuit: the completion of the decomposition of analog signals and digital signal synthesis. Clock control circuit: to provide the system clock. DRAM Interface: Provides address and control signals for external dynamic memory (DRAM). Voltage Follower and Bandpass Filters: Improve the quality of speech signals as they are synthesized. CPU Interface: Directly connected to the external central microprocessor (CPU). The T6668 pinout is shown in Figure 6 above. The ①, ②, ④, ⑤ foot CAS_1 ~ CAS_4 for the first 1 to 4 dynamic memory chip column address