[ASAHI KASEI]
[AK7740ET]
AK7740ET
24bit 2ch ADC + 24bit 4ch DAC with Audio DSP
1. General Description
The AK7740 is a highly integrated audio processing IC, including four 24-bit output D/A channels, a stereo 24-bit
input A/D, and an audio DSP. High quality analog output performance is provided by the quad DAC with 97dB
dynamic range, and the stereo ADC with 98dB dynamic range. The converters support sampling frequencies from
32kHz to 48kHz. This device includes 72kbits of SRAM audio delay that is suitable for simulated sound fields. The
DSP is optimized for audio signal processing. The design allows up to 512 execution lines per audio sample cycle,
with multiple functions per line. The AK7740 is ideal for sound field control applications, including echo, 3D,
parametric equalization, and speaker compensation. It is housed in a 48-lead 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: 4-bits)
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
Other numbers in parentheses are restricted. Provided with indirect shift function
Program RAM:
512 x 32-bit
Coefficient RAM:
512 x 16-bit
Data RAM:
256 x 24-bit
Offset RAM:
48 x 13-bit
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(6144 x 12-bit / 3072 x 24-bit / 4096 x 12-bit + 1024 x 24-bit )
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Internal Memory:
72kbit SRAM
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Sampling frequency: 32kHz 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 to 4 ch ): 16/20/24-bit : Output port ( 2 ch ): 24-bit
ADC: 2 channels
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24-bit 64x over-sampling delta sigma
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DR, S/N : 98dBA ( full-differential Input )
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S/(N+D) : 89dB
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Digital HPF (fc = 1Hz)
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Single-ended or 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 : 97dBA
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S/(N+D) : 89dB
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Single ended or differential output
Input Selector
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1 full-differential and 4 single-ended Input
Other
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Power supply:
+3.3V±10%
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Operating temperature range: -10°C~70°C
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Package: 48pin LQFP (0.5mm pitch)
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<Pre-E-01>
-1-
2006/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
