Codec IC - CJC8974A
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DAC SNR 91dB (‘A’ weighted), THD –81.2dB at 48kHz, 1.8V
ADC SNR 92.7dB (‘A’ weighted), THD -82dB at 48kHz, 1.8V
2x On-chip Headphone Drivers
-THD –78dB , SNR 93dB with 16Ω load Hz, 1.8V
Digital Graphic Equaliser
- Model Number: CJC8974A
- Data Sheet:
- Quantity:
- - +
Product Specification
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 4Ω 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 96kHz, 48kHz, 44.1kHz are generated directly from the master clock without the need for an external PLL.
To conserve power in portable applications, the CJC8974A micropower shutdown mode (IQ =0.6µA, typ) is activated when VDD is applied to the SHUTDOWN pin.Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply voltages from 2.0V to 5.5V. Since the CJC8974A does not require output coupling capacitors, bootstrap capacitors, or snubber networks, it is ideally suited for low-power portable systems that require minimum volume and weight.The CJC8974A operates at supply voltages down to 1.8V, although the digital core can operate at voltages down to 1.5V to save power, and the maximum for all supplies is 3Volts. Different sections of the chip can also be powered down under software control. The CJC8974A is supplied in a very small and thin 5x5mm COL package, ideal for use in hand-held and portable systems.
FEATURES：
DAC SNR 91dB (‘A’ weighted), THD –81.2dB at 48kHz, 1.8V
ADC SNR 92.7dB (‘A’ weighted), THD -82dB at 48kHz, 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 3V
-Digital core: 1.5V to 3V
-Digital I/O: 1.8V to 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, 96kHz 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)
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
APPLICATIONS：
Portable Multimedia players
Multimedia handsets
Handheld gaming
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