Audio Codec Adapter Setup for Cinterion
®
Modules
2 Audio Codec Adapter Overview
33
audio_codec_adapter_setup_v04 2019-10-16
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2 Audio Codec Adapter Overview
This chapter gives an overview of the available Audio Codec Adapters, i.e., MAX9860 in Sec-
tion 2.1 and NAU8822 in Section 2.2 employed by Gemalto M2M to evaluate the digital audio
interface functionality of the supported modules.
2.1 MAX9860 Audio Codec Adapter
The MAX9860 Audio Codec Adapter is based on the MAX9860 16-bit mono audio voice codec
from Maxim Integrated. The adapter board can be plugged to the DSB75 (or DSBmini) in order
to be used with a variety of Cinterion
®
modules (see Section 1.2), and supports the following
features:
The Audio Codec Adapter supports the following features:
• Directly connects to DSB75 (or Mini-DSB)
• Most important configuration settings are accessible via DIP switch
• Almost all configuration settings are accessible via RS232 serial interface
• PCM/I2S support
• BCLK = 256(only in slave mode), 512, 1024, 2048kHz
• Master/Slave mode
• 16kHz WB/8kHz NB mode
• Handset/Headphone support
• Short/long FSYNC
2
• Sending DTMF sound sequences on analogue or on digital (long FSYNC Intel mode)
• Recognizing beep sounds by means of FFT on analogue or on digital (long FSYNC Intel
mode)
2.1.1 Interfaces
Figure 1 and Figure 2 show various interfaces on the top and bottom sides of the Audio Codec
Adapter.
Figure 1: Audio Codec Adapter top view
2.
Note: The short frame master mode is not usable because the MAX9860 voice codec generates wrong
AD converter output at bit 14.
Top
RS232
Reset
Interface
button
DIP switch
Headset
(Microphone,
Headphone)
3.5mm jacks
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