eKA8561A
USB Audio Controller
6
Function Description
The eKA8561A is a USB Audio Controller that transmits/receives audio data stream
to/from the host through its Audio Streaming interface. The Audio Data Format
supports 16-bit, 2-channel, and 48kHz PCM. It has three interfaces. Interface 1
supports three sampling frequencies. The sampling rate is changed when “Set
Endpoint Control Request” is issued. If user plays other format audio data, the
application software transforms it to 48kHz data and then transmit to this device. For
Interface 2, this device transmits data at a rate that is locked to frame timing. When
user use the recording format (ex. 8kHz) to record speech other than 48kHz stereo
format, the application software transforms 48kHz data to 8kHz data. Interface 3 is HID
pipe which is used to read button status.
The volume and mute control can be activated via host (audio device class requests) or
via I/O pins (HID plus audio device class requests). When this function is activated via
host, the host manages the audio PCM data directly. The eKA8561A device just
playback the audio data. Otherwise, when it is activated via I/O pins, the eKA8561A
sends the controlled feature (Volume, Mute) message through HID pipe and signals the
host to manage the audio PCM data directly.
7
Absolute Maximum Rating
Symbol
Temperature under bias
Storage temperature
Input voltage
Output voltage
Min
0
-65
-0.5
-0.5
Max
70
150
6.0
6.0
Unit
ºC
ºC
V
V
Product Specification (V0.1) 04.21.2006
(This specification is subject to change without further notice)
•
5
EMC [ ELAN MICROELECTRONICS CORP ]
