[ASAHI KASEI]
[AK7744]
AK7744VT
24bit 3ch ADC + 24bit 4ch DAC with Audio DSP
1. General Description
The AK7744 is a highly integrated audio processing IC featuring four 24-bit D/A converters, a stereo and monau
ral input 24-bit A/D and on-chip DSP. The four D/A converters with 107dB dynamic range, and A/D with 97dB dyn
amic range provide high quality analog performance. These D/A and A/D support sampling frequencies from 8kHz
to 48kHz. This device also includes 24kbit of SRAM for delayed audio effects. This programmable DSP is optimize
d for audio signal processing. The design allows up to 512 execution lines per audio sample cycle, with multiple fun
ctions per line. The AK7744 can be used to implement complete sound field control, such as surround control, 3D,
parametric equalization, etc. It is packaged in a 64-pin LQFP package.
2. Features
DSP:
Word length:
24-bit (Data RAM)
Instruction cycle time: 40ns (512fs, fs=48kHz)
Multiplier: 24 x 16
→
40-bit
Divider:
24 / 24
→
16-bit or 24-bit
ALU:
34-bit arithmetic operation (Overflow margin: 4bit)
24-bit arithmetic and logic operation
Shift+Register: 1, 2, 3, 4, 6, 8 and 15 bits shifted left
1, 2, 3, 4, 8 , 14 and 15 bits shifted right
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Other numbers in parentheses are restricted. Provided with indirect shift function
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Program RAM:
512 x 32-bit
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Coefficient RAM:
512 x 16-bit
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Data RAM:
256 x 24-bit
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Offset RAM:
48 x 11-bit
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(2048 x 24-bit / 1024 x 24-bit )
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Internal Memory:
24kbit SRAM
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Sampling frequency: 8kHz to 48kHz
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Serial interface port for micro-controller
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Master clock: 512fs
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Master/Slave operation
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Serial signal input port ( 2 ch ): 16/20/24-bit : Output port ( 2 ch ): 24-bit
Input Selector
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Normal stereo : 1 full-differential and 5 single-ended Input
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Interrupt monaural : 1 full-differential and 1 single-ended Input
ADC: 2 channels
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24-bit 64x Over-sampling delta sigma
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DR, S/N : 97dBA ( Full-differential Input )
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S/(N+D) : 86dB
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Digital HPF (fc = 1Hz)
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Single-ended or Full-differential Input
ADC: 1 channel ( Interrupt input )
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DR, S/N : 97dBA(Full-differential Input)
DAC: 4 channels
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24-bit 128x Over-sampling advanced multi-bit
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DR, S/N : 107dBA
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S/(N+D) : 92dB
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Full-differential Output
Other
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Power supply:
+3.3V±0.3V
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Operating temperature range: -40°C~85°C
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Package: 64pin LQFP (0.5mm pitch)
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<MS0167-E-00>
- 1 -
2002/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
