AK7712 Asahi Kasei Microsystems, AK7712 Datasheet - Page 29

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

ASAHI KASEI
Together with shift function, each double-precision calculations of (24 × 31-bit), (45 × 31-bit) and (45 × 16-bit) are
available.
, (24
(24
The obtained value X YH should be added after shifting 16 bits to left compared with X YL. But, as X YL is the
data which is shifted 1bit to right, actually X YH is added after shifting 15 bits to left.
0180-E-02
31-bit) calculation is done with Coefficient RAM data regulated as follows.
31-bit) Calculation
,OP,
,OP,
,OP,CR
,OP,CR
,OP,
,OP,
,IDR0=SH0 <<
,IDR0=SHRF + LDR0
DR ,
DR ,
,
,
<Example of Calculation Program (24
,CPU,DU1,,, ;Read of Coefficient(MSB) and Data
,CPU,
,
,
,
,
,
,
,
,
,,,
,,,
,,,
,,, ;(X YH) + 15-bit right-shifted (X YL)
,,, ;Read of Coefficient(LSB)
- 29 -
31-bit)>
[AK7712A-VT]
1997/12