ADI 公司的SSM2603是低功耗高質(zhì)量立體聲音頻CODEC,具有兩個(gè)24位ADC和兩個(gè)DAC通路,可工作在主或從模式,模擬工作電壓1.8V-3.6V,數字核電壓1.5V-3.6V,數字I/O電壓1.8V-3.6V,3.3V和48kHz的DAC SNR為100dB(A加權),THD為-80dB而ADC的SNR為100dB(A加權),THD為-80dB,主要用在手機,MP3播放器,,手提游戲機,手持電子設備和教育玩具.本文介紹了SSM2603主要特性, 方框圖, 典型應用電路圖以及音頻CODEC評估板EVAL-SSM2603主要特性,電路圖,材料清單和PCB布局圖.
The SSM2603 is a low power, high quality stereo audio codec for portable digital audio applications with one set of stereo programmable gain amplifier (PGA) line inputs and one monaural microphone input. It features two 24-bit analog-to- digital converter (ADC) channels and two 24-bit digital-to- analog (DAC) converter channels. The SSM2603 can operate as a master or a slave. It supports various master clock frequencies, including 12 MHz or 24 MHz for USB devices; standard 256 fS or 384 fS based rates, such as 12.288 MHz and 24.576 MHz; and many common audio sampling rates, such as 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz, 16 kHz, 12 kHz, 11.025 kHz, and 8 kHz. The SSM2603 can operate at power supplies as low as 1.8 V for the analog circuitry and as low as 1.5 V for the digital circuitry. The maximum voltage supply is 3.6 V for all supplies. The SSM2603 software-programmable stereo output options provide the user with many application possibilities. Its volume control functions provide a large range of gain control of the audio signal. The SSM2603 is specified over the industrial temperature range of −40℃ to +85℃. It is available in a 28-lead, 5 mm × 5 mm lead frame chip scale package (LFCSP).

SSM2603主要特性:
Stereo, 24-bit analog-to-digital and digital-to-analog converters
DAC SNR: 100 dB (A-weighted), THD: −80 dB at 48 kHz, 3.3 V
ADC SNR: 90 dB (A-weighted), THD: −80 dB at 48 kHz, 3.3 V
Highly efficient headphone amplifier
Stereo line input and monaural microphone input
Low power
7 mW stereo playback (1.8 V/1.5 V supplies)
14 mW record and playback (1.8 V/1.5 V supplies)
Low supply voltages
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 over- sampling rate in USB mode
Audio sampling rates: 8 kHz, 11.025 kHz, 12 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz
28-lead, 5 mm × 5 mm LFCSP (QFN) package

SSM2603應用:
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys

圖1. SSM2603方框圖

圖2. SSM2603典型應用電路圖

音頻CODEC評估板EVAL-SSM2603
The SSM2603 is a low power, high quality stereo audio codec for portable digital audio applications with one set of stereo programmable gain amplifier (PGA) line inputs and one monaural microphone input. The board can operate as a master or slave and supports various clock frequencies. The SSM2603 software-programmable stereo output options provide many application possibilities because the device can be used as a headphone driver or as a speaker driver. Its volume control functions pro-vide a large range of gain control of the audio signal. Included in this data sheet is a detailed setup and user guide for the SSM2603 evaluation board hardware and software. Read the Evaluation Board Quick Setup section to ensure that proper communi-cation is established from the host PC to the SSM2603 evaluation board.
This data sheet describes how to configure and use the SSM2603 evaluation board. It is recommended that the SSM2603 evaluation board data sheet be read in conjunction with the SSM2603 data sheet, which provides more detailed information about the specifications, internal block diagrams, and application guid-ance for the codec IC.
The SSM2603 evaluation board carries a complete application circuit for the SSM2603. The board features a USB connection to a host PC. This serves as the power supply, digital audio data, and control/status data link, making it a plug-and-play USB audio device that can communicate with the software under the Microsoft® Windows® operating system. The board also has a general-purpose 2.54 mm pitch connector to connect to an external DSP/MCU for digital audio signals.

評估板EVAL-SSM2603主要特性:
USB connectivity to host PC
External connectivity to DSP/MCU for digital audio signals (available through general-purpose 2.54 mm pitch connector)
4 audio jacks: stereo line input, mono microphone input, stereo line output, and stereo headphone output
Multiple test points across the board for monitoring signals
Master/slave mode selectivity

圖3.評估板EVAL-SSM2603外形圖

圖4.評估板EVAL-SSM2603電路圖:SSM2603芯片

圖5.評估板EVAL-SSM2603電路圖:電源

圖6.評估板EVAL-SSM2603電路圖:數字緩沖器

圖7.評估板EVAL-SSM2603電路圖:模擬輸出

圖8.評估板EVAL-SSM2603電路圖:模擬輸入

圖9.評估板EVAL-SSM2603電路圖:USB MCU
評估板EVAL-SSM2603材料清單:




圖10.評估板EVAL-SSM2603 PCB布局圖:頂層

圖11.評估板EVAL-SSM2603 PCB布局圖:底層