Stereo Digital Audio CODEC Solution Using SSM2603
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ADI's SSM2603 is a low-power, high-quality stereo digital audio CODEC for portable digital audio applications with a set of stereo programmable gain amplifier (PGA) line inputs and a monaural microphone input. It has two 24-bit analog-to-digital converter (ADC) channels and two 24-bit digital-to-analog converter (DAC) channels. The SSM2603 can be used as a master or slave. It supports multiple master clock frequencies, including 12MHz or 24MHz for USB devices; standard 256fS or 384fS base rates such as 12.288MHz and 24.576MHz; and many common audio sample rates such as 96kHz, 88.2kHz, 48kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz, 16 kHz, 12 kHz, 11.025 kHz, and 8 kHz. The SSM2603 operates from a minimum of 1.8V in the case of analog circuits and operates from a supply voltage as low as 1.5V in the case of digital circuits. The SSM2603 software programmable stereo output option offers users a variety of application possibilities. Its volume control provides extensive gain control of the audio signal. The industrial application temperature range of the SSM2603 is -40°C to +85°C. It is available in a 28-pin, 5mm x 5mm leadframe chip scale package (LFCSP). 
Figure 1 SSM2603 functional block diagram 
Figure 2 SSM2603 typical application circuit diagram
Main features of SSM2603
• Stereo, 24-bit analog-to-digital and digital-to-analog converters
• 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 to 3.6 V
- Digital core: 1.5 V to 3.6 V
- Digital I/O: 1.8 V to 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 x 5mm LFCSP (QFN) package 
Figure 3 SSM2603 evaluation board top outline drawing
SSM2603 application
• Mobile phone
• MP3 player
• Portable game console
• Portable electronic devices
• brain game
SSM2603 Evaluation Board
The SSM2603 evaluation board contains a complete application circuit for the SSM2603 that is connected to the host PC via USB. As a link to power, digital audio data and control/status data, it becomes a plug-and-play audio device that can communicate via software under the Microsoft Windows operating system. The evaluation version uses a universal 2.54mm pitch-pitch connector that connects to an external DSP/MCU for digital audio signals.
Main features of the SSM2603 evaluation board
• Connect to the host PC via USB
• Externally connected to the DSP/MCU for digital audio signals (via universal 2.54mm pin, pitch connector)
• 4 audio jacks: stereo input line, mono microphone input, stereo line out, and stereo headphone output
• Multiple test points on the evaluation board for monitoring signals
• Master/slave mode selection
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