AK7712 Asahi Kasei Microsystems, AK7712 Datasheet - Page 2

• Manufacturer Part Number: AK7712
• Description: Built-in 20-bit ADC/DAC Sophisticated Audio DSP
• Manufacturer: Asahi Kasei Microsystems

ASAHI KASEI
0180-E-02
1) Calculate Unit
2) Internal Memory
3) External Memory Access (SRAM Pseudo-SRAM DRAM)
4) Input/Output Port
5) Cascade connection with this LSI is possible.
6) Interface to Microcomputer:
7) Calculation Cycle:
8) Master/Slave conversion of LRCK BCLK is possible.
9) BCLK:
Multiplication:
Division:
ALU:
Shift:
Register:
Double precision operation:
Program RAM:
Data RAM:
Coefficient RAM:
Offset RAM:
Microcomputer buffer:
Objective memory:
Treating bit length:
The number of times to access:
Memory access time:
Maximum address length:
Input:
Output: 4ch analog output: 20-bit DAC, DR=97dB(16-bit at BCLK=32fs)
2ch analog input: 20-bit ADC, DR=98dB (16-bit at BCLK=32fs)
2ch digital input: MSB justified 20-bit (16bit at BCLK=32fs)
2ch digital input: MSB justified 16- 24-bit / LSB justified 16- 24-bit
4ch digital output: MSB justified 20-bit (16bit at BCLK=32fs)
2ch digital output: MSB justified 16- 24-bit/ LSB justified 16-bit
24-bit
16-bit
34-bit arithmetic operation
24-bit arithmetic logic operation
1-,2-,3-,4-,6-,8-,15-bit right/left shift
AK7712A has indirect shift function.
(A shift using DBUS data can not use DBUS
as multiplication input.)
34-bit
24-bit
24-bit(data)×31-bit(coefficient), 45
384 word
128 word
256 word
40 word
16 word
256k(32k
256k(32k
256k(64k
(Half volume of 1M DRAM is used as 512k memory.)
16-bit (24-bit is available, but double time is needed for access.)
SRAM, 256k Pseudo-SRAM
: DRAM, 1M Pseudo-SRAM
: SRAM, 256k Pseudo-SRAM
: DRAM, 1M Pseudo-SRAM
less than 100nsec
65535 sampling times (at 1M SRAM)
2.048sec at 32kHz, 1.486sec at 44.1kHz, 1.365sec at 48kHz
[when built-in ADC is connected.]
[when built-in ADC is isolated.]
[when built-in ADC is connected.]
[when built-in ADC is isolated.]
synchronized 8-bit serial input / synchronized 24-bit serial output
max 18.432MHz(54nsec) [at 48.0kHz, 384fs, 5V]
32fs/48fs/64fs (64fs only at master mode)
16-bit
16-bit
4(ACC) [for ALU]
8(TMP) [for DBUS connection]
16-bit (for external memory access)
16-bit
32-bit
24-bit
16-bit
8-bit),1M(128k
8-bit),1M(128k
4-bit),1M(256k
Detail Features
40-bit(fixed-point, 2 instruction cycle time)
16-bit(fixed-point, 17 instruction cycle time)
- 2 -
8-bit)
8-bit)
4-bit)
; 76 at 384fs
; 64 at 384fs (32 at one DRAM)
; 51 at 256fs
; 42 at 256fs (21 at one DRAM)
31, 45
1 / SRAM
1 / Pseudo-SRAM
2 or
1 / DRAM
16
MSB first serial input
MSB first serial input
MSB first serial output
MSB first serial output
[AK7712A-VT]
1997/12