[AK7770]
AK7770EQ
Audio DSP with Multi-Channel Audio CODEC
GENERAL DESCRIPTION
The AK7770 is a digital signal processor with an integrated 4-channel audio ADC and a 6-channel audio
DAC, as well as an S/PDIF transmitter. It utilizes an enhanced dual bit architecture that results in wide
dynamic range for the ADC, and the advanced multi-bit architecture of the DAC enables wide dynamic
range and low out-of-band noise. Two sample-rate converters are integrated, allowing for operation at
48kHz sampling rate with input rates of 32kHz, 44.1kHz, or 48kHz. Volume control, compression, EQ and
sound processing are performed by the DSP. In addition, delay adjustment up to 70ms is possible for four
output channels through the integrated delay RAM. The AK7770 is packaged in a space-saving 80-pin
LQFP package.
FEATURES
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DSP
- Data Width: 24-bit (Data RAM F20.4 floating Point)
- Processing Speed: 13.5 ns (1536step/fs; fs = 48kHz)
- Multiplication: 20 x 16
→
36-bit Double precision arithmetic available
- Program RAM: 1536 x 36-bit
- Coefficient RAM: 1536 x 16-bit
- Offset RAM: 64 x 14-bit
- DRAM: 14kword (1word = F16.4 floating point)
- Sample Rate: fs = 48kHz
- Master / Slave operation
■
4:2 Selector with Input Pre-amp
■
4ch 24-bit ADC
- 64-times oversampling
- Sample Rate: 48kHz
- S/(N+D): 84dB (fs = 48kHz)
- DR, S/N: 96dB (fs = 48kHz)
- Digital HPF for offset DC cancellation
- Channel independent Digital Volume control (+24/-103dB, 0.5dB step)
- Soft Mute
6ch 24-bit DAC
- 128-times oversampling
- Sample Rate: 48kHz
- S/(N+D): 88dB (fs = 48kHz )
- DR, S/N: 100dB
- Channel independent Digital Volume control (+12/-115dB, 0.5dBstep)
- Soft Mute
- Digital de-emphasis
■
MS0699-E-01-PB
-1-
2008/06
AKM [ ASAHI KASEI MICROSYSTEMS ]
