General Description

The eKA8564A is a USB digital audio controller with audio data processing that supports 16-bit 2-channel format at 48kHz, 44.1kHz, 32kHz or 8kHz sampling rate. The device has an integrated USB transceiver, USB core, MCU, DAC, ADC, and I2S Input/Output. It can handle a high-level USB protocol, and manages user interface via HID I/O pins.

Features

■ USB Specification v1.1 Compliant

■ USB Audio and Human Interface Device (HID) Class v1.1 Compliant

■ Supports 12 Mbits/s Full Speed Serial Data Transmission

■ Supports 48kHz, 44.1kHz, 32kHz, 8kHz sampling rate

■ Single oscillator: 6MHz

■ Audio buffer size: 192×16 bits × 2

■ Total of four Endpoints: Endpoint 0 for control transfer, Endpoint 1 for audio streaming out, Endpoint 2 for streaming in , Endpoint 3 for HID

■ Supports stereo/mono playback

■ Built-in 2-channel D/A Converter with 10-bit resolution

■ Built-in 1-channel A/D converter with 10-bit resolution

■ Alternative settings supported by the audio streaming-out interface:

   ALT-0: (default setting) zero isochronous bandwidth

   ALT-1: 16-bit PCM 2 channel

■ Alternative settings supported by the audio streaming-in interface:

   ALT-0: (default setting) zero isochronous bandwidth

   ALT-1: 16-bit PCM stereo

■ 2K×13 on-chip program ROM

■ 32 bytes of general purpose RAM (R20~R3F)

■ RC Oscillator with internal RC

■ 5 level stack for subroutine nesting

■ Total of 8 HID control pins (Mute Speaker, Volume Down, Volume Up, Mute REC, Play/Pause, Stop, Scan next track, Scan previous track)

■ Total of 4 LED output pins (REC Mute LED, Power LED, Play LED, SPK Mute LED)

■ MCU run at 6 MHz frequency

■ Package: 48-pin LQFP

Applications

■ USB Speaker

■ USB Microphone

■ USB Telephone