High quality domestic stereo codec cjc8988, pin to pin replaces wm8988

Support video and audio compression （CO） With decompression ( DEC ) Codec or software .CODEC Technology can effectively reduce the space occupied by digital storage , In computer system , Complete with hardware CODEC Can save CPU Resources for , Improve the efficiency of the system .Codec Chip pair AD The transformed audio and video digital signals are transmitted and encoded 、 Compress , Decode the signal at the receiving end .
Codec The main function of codec is to compress and decompress the video signal . The computer industry is defined by 24 True color of bit measurement system , This defines nearly a million colors , Approaching the limits of human vision . This means that if the video needs to be in seconds 30 Frame speed playback , Then up to... Will be transmitted per second 27MB Information about ,1GB The capacity of the hard disk can only store about 37 Seconds of video information . Therefore, the information must be compressed . By discarding some digital information or image information that is easy to be ignored by our eyes and brain , Reduce the amount of video information . The software or hardware for video compression and decompression is the codec . The compression rate of codec is from the general 2：1-100：1 Unequal , It makes it possible to process large amounts of video data .

Codec chip - CJC8988 It is a low power , High quality stereo codec , Can directly Pin to Pin replace WM8988, Designed for portable digital audio applications . The device integrates a complete interface to 2 Stereo headphones or line out ports . The requirements for external components are greatly reduced , Because you don't need a separate Headphone Amplifier . Advanced on-chip digital signal processing implements graphic equalizers , Microphone or line input for 3D sound enhancement and automatic level control .
CJC8988 It can operate as a master or a slave , It has various master clock frequencies , Include 12 or 24MHz, Or standard 256fs frequency , Such as 12.288MHz and 24.576MHz. Different audio sampling rates , Such as 96 kHz,48 kHz,44.1 kHz, Directly from the master clock , Without an external PLL.
CJC8988 When the supply voltage drops to 1.8V Work at the same time , Although the digital core can be reduced to 1.5V To save electricity , And the maximum voltage of all power supplies is 3.3 v . Different parts of the chip can also be powered off under software control .CJC8988 Provides a very small and thin 4x4mmCOL package , Ideal for handheld and portable systems .
Codec chip - CJC8988 Characteristics of ：
DAC Signal-to-noise ratio 93 dB(“A” weighting ),T hd -87dB stay 48 kHz,1.8V
ADC Signal-to-noise ratio 91 dB(“A” weighting ),THD-81dB stay 48 kHz,1.8V
2 Headphone driver on a chip
-THD-78dB, Signal-to-noise ratio 93 dB,16Ω load Hz,1.8V
Digital graphic equalizer
Low power （ Microscope ）
-7.8mW Stereo player （1.8V Power Supply ）
-16.8mW Record and playback （1.8V Power Supply ）
Low supply voltage
- simulation 1.8V to 3.3V
- Digital movement ：1.5V To 3.3V
- Digital input I/O：1.8V to 3.3V
256fs/384fs or USB Master clock rate ：12MHz,24MHz
Audio sampling rate ：8、11.025、16、22.05、24、32、44.1、48
88.2,96 individual kHz Generated internally from the master clock
4x4mmCOL packing