GENERAL DESCRIPTION

The KX1400 is an audio playback IC designed to play 8KHz audio data directly to an external speaker via an on-chip digital audio processor and Class-D driver. Both 12-bit PCM and 4-bit IMA ADPCM data formats are supported. It also has a built-in tone generator capable of generating tones at 4096 different frequencies. The on-chip audio processor eliminates the need for an external low-pass filter in most cases. The KX1400 utilizes low power CMOS technology and provides a stand-by power-savings state, making it well suited for battery powered applications.

The KX1400 operates in either a stand-alone mode or interfaced to a microcontroller (MCU) host. Audio data is provided to the KX1400 from either a user-programmed external serial memory or from the host MCU. Under MCU control, the user can select phrases or tone sequences to play from the external memory, play tone sequences via commands, or stream audio data directly to the on-chip audio processor. In stand-alone mode no MCU is required; on reset, the KX1400 plays a single phrase from external memory and then returns to a stand-by power-saving state.