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 alleviates 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.

KX1400主要特性:
Plays Pre-recorded 8kHz Audio Data
On-chip Tone Generator
Operates Stand-alone or as MCU Peripheral
Built-in Digital Audio Processor
Integrated Class-D Speaker Driver
No External Low-pass Filter Required
Digital Volume Control
On-chip Oscillator – No XTAL Required
Plays up to 4096 Pre-recorded Audio Phrases
Configurable General-purpose Clock Output
Two General-purpose Digital Outputs
Low-power Standby State (1 μA Typ.)
Operating Voltage: 2.7V – 5.5V
Operating Temperature: -40℃ to 85℃
Packages:
- 20-pin SOIC (KX1400EW)
- 24-pin 4X4mm QFN (KX1400EG

图1.K1X1400功能方框图

图2.KX1400单独使用电路图

图3.KX1400主机控制系统电路图

图4.带外接存储器的KX1400主机控制系统电路图

KX1400开发套件
The KX1400 Development Kit provides the hardware and software necessary to quickly and easily interface the KX1400 Audio Playback IC to a PC-based host. The included KX1400 Evaluation Board simplifies the development of audio content and hardware prototyping for microcontroller-based designs. The development kit software includes a complete Integrated Development Environment (IDE) with features for real-time execution of KX1400 host-interface commands. Several example projects for creating audio data are included to demonstrate the capabilities of the KX1400 Audio Playback IC.
The KX1400 Development Kit includes: a KX1400 Evaluation Board populated with a KX1400EG (24-pin QFN), Keterex USB Adapter, Software and Product Information CD-ROM, and USB Cable.

KX1400开发套件主要特性:
Provides a PC-based Interface to the KX1400 via USB
On-board 16-MByte External Flash Memory
Stores over 30 minutes of 8 KHz Audio Data
On-board Memory Programmable via USB
Complete Integrated Development Environment
Stand-alone and Host-controlled Operating Modes Supported
Expansion Connector for MCU-based Prototyping
3.5mm (1/8” mini-plug) Audio Jack
Directly drives 0.25W Speaker or Ear-bud Style Headphones


图5.KX1400开发套件外形图


图6.KX1400评估板方框图

图7.KX1400评估板电路图