Stereo digital audio CODEC scheme using SSM2603
ADI's SSM2603 is a low-power, high-quality stereo digital audio CODEC for portable digital audio applications. It has a set of stereo programmable gain amplifier (PGA) line inputs and a non-stereo microphone input. It has two 24-bit analog-to-digital converter (ADC) channels and two 24-bit digital-to-analog converter (DAC) channels. SSM2603 can be used as a master or slave. It supports multiple master clock frequencies, including 12MHz or 24MHz frequencies for USB devices; standard 256fS or 384fS base rates, such as 12.288MHz and 24.576MHz; and many commonly used audio sampling rates, such as 96kHz, 88.2kHz, 48kHz 44.1kHz, 32kHz, 24kHz, 22.05kHz, 16kHz, 12kHz, 11.025kHz and 8kHz. The SSM2603 can be operated with a minimum 1.8V power supply in the case of analog circuits, and as low as 1.5V power supply in the case of digital circuits. The SSM2603 software programmable stereo output option provides users with multiple application possibilities. Its volume control function can perform a wide range of gain control on the audio signal. The industrial application temperature range of SSM2603 is -40 ℃ to + 85 ℃. It uses a 28-pin, 5mm × 5mm lead frame chip scale package (LFCSP). 
Figure 1 SSM2603 functional block diagram 
Figure 2 SSM2603 typical application circuit diagram
SSM2603 main features
• Stereo, 24-bit analog-to-digital and digital-to-analog converter
• DAC SNR: 100dB (A-weighted), THD: -80dB at 48kHz, 3.3V
• ADC SNR: 90dB (A-weighted), THD: -80dB at 48kHz, 3.3V
• High efficiency headphone amplifier
• Stereo line input and monaural microphone input
• Low power
-7mW stereo playback (1.8V / 1.5V power supply)
-14mW recording and playback (1.8V / 1.5V power supply)
• Low power supply
-Analog: 1.8 V ～ 3.6 V
-Digital core: 1.5 V ～ 3.6 V
-Digital I / O: 1.8 V ～ 3.6 V
• 256/384 oversampling rate in normal mode; 250/272 oversampling rate in USB mode
• Audio sampling rate: 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz and 96kHz
• 28-pin, 5mm × 5mm LFCSP (QFN) package 
Figure 3 SSM2603 evaluation board top outline drawing
SSM2603 application
• Mobile phone
• MP3 player
• Portable game console
• Portable electronic equipment
• brain game
SSM2603 Evaluation Board
The SSM2603 evaluation board contains a complete application circuit for the SSM2603, which is connected to the host PC via USB. As a power, digital audio data and control / status data link, it becomes a plug-and-play audio device that can communicate through software under the Microsoft Windows operating system. The evaluation version uses a universal 2.54mm pin pitch connector and connects to an external DSP / MCU to obtain digital audio signals.
Main Features of SSM2603 Evaluation Board
• Connect to the host PC via USB
• Externally connect to DSP / MCU to obtain digital audio signal (through general 2.54mm pin, pitch connector)
• 4 audio jacks: stereo input line, mono microphone input, stereo line output, and stereo headphone output
• There are multiple test points on the evaluation board for monitoring signals
• Master / slave mode selection
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