Product Brief
AKU-EP1
Digital Output Microphone Evaluation Board
www.akustica.com
Measuring Acoustic Performance
The Eval Board can be used for precise acoustic
performance verification of an Akustica digital microphone.
A typical acoustic test involves placing an acoustic
pressure source in front of the sample coupon connected
to the board.
In this configuration, the output of the
device under test can be observed in any of three output
formats. The following describes the various digital
outputs supported by the Eval Board.
Interface Specification
AES3 Output
•
Reformat PCM signal to AES3
•
24-bit resolution with 44.1 kHz sampling rate
•
SMB – 50 Ohm jack
PDM Output
•
Buffered output of digital microphone
•
Buffered clock output
PCM Output
•
PCM conversion of PDM signal
•
24-bit resolution with 44.1 kHz sampling rate
•
Pin header interface
•
Full scale = 75% 1’s density PDM
Power Specifications
•
DC Input: 3V min to 5V max, 500mA
Overview
The AKU-EP1 Rev2 evaluation board (Eval Board) is a
stand alone platform that can be used for both quick and
convenient performance verification, as well as for
portable demonstrations of Akustica digital-output
microphones. With the option of analog or digital data
output formats, the Eval Board interfaces easily to
standard audio test equipment. An on-board oscillator
®
provides a standard Direct Stream Digital (DSD ) clock
(2.8224 MHz). In addition, the Eval Board utilizes two
coupon board sockets to interface to Akustica digital-
output microphone samples in single or multiplexed
modes of operation.
The three digital output formats supported by the Eval
Board are:
•
•
•
Buffered pulse-density-modulated (PDM) digital-
output from the digital-microphone output
Pulse-code-modulated (PCM) digital-output
generated by the on-board 24-bit converter
AES3 output for direct connection to an Audio
®
Precision analyzer
Analog line out (pin header and SMB jack) and a
headphone jack with volume control are also provided.
Akustica, Inc.
2835 East Carson Street, Suite 301
Pittsburgh, PA 15203 USA
ph: (412) 390-1730 fx: (412) 390-1737
www.akustica.com
Data subject to change without notice | © Akustica, Inc. 2011 | All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the
event of applications for industrial property rights. | September 2012 | PB11-1.0
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