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内嵌功放Audio Codec

The CJC8974A is a low power, high quality stereo CODEC designed for portable digital audio applications and a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 4 Ω load with less than 10% THD when powered by a 5V power supply. The device integrates complete interfaces to ONE stereo headphone or line out ports. External component requirements are drastically reduced as no separate headphone amplifiers are required. Advanced on-chip digital signal processing performs graphic equaliser, 3-D sound enhancement and automatic level control for the microphone or line input. The CJC8974A can operate as a master or a slave, with various master clock frequencies including 12 or 24MHz for USB devices, or standard 256fs rates like 12.288MHz and 24.576MHz. Different audio sample rates such as 96 kHz, 48 kHz, 44.1 kHz are generated directly from the master clock without the need for an external PLL.


 DAC SNR 91dB (‘A’ weighted), THD –81.2dB at 48 kHz, 1.8V 

 ADC SNR 92.7dB (‘A’ weighted), THD -82dB at 48 kHz, 1.8V 

 2x On-chip Headphone Drivers -THD –78dB, SNR 93dB with 16Ω load Hz, 1.8V 

 Digital Graphic Equaliser 

 Low Power -7mW stereo playback (1.8V supplies) -13mW record and playback (1.8V supplies) 

 Low Supply Voltages -Analogue 1.8V to 3.3V -Digital core: 1.5V to 3.3V -Digital I/O: 1.8V to 3.3V 

 256fs / 384fs or USB master clock rates: 12MHz, 24MHz 

 Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48 

 88.2, 96 kHz generated internally from master clock

 PO at 10% THD+N, 1kHz 

 LD: 3Ω,4Ω loads 3W (typ), 2.5W (typ) 

 All other packages: 8Ω load 1.5W (typ)

 Shutdown current 0.6µA (typ) 

 VDD Supply voltage range 2.0V to 5.5V

 THD at 1kHz at 1W continuous average output power 

 into 8Ω 0.5% (max) 

 5x5mm COL package

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