AK7712A-VT Datasheet, PDF (31/87 Pages) Asahi Kasei Microsystems – Built-in 20-bit ADC/DAC Sophisticated Audio DSP

ASAHI KASEI
, (45 × 16-bit) Calculation
(45 × 16-bit) calculation is done with the data regulated as follows.
[AK7712A-VT]
This 34-bit data is shifted 15 bits to right and then is added to upper data.
In this way, upper 24 bits and lower 21 bits are calculated.
<Example of Calculation Program(45 × 16-bit)>
,OP,
,
,OP,
,
,OP,CR × DR ,
,OP,CR × DR ,
,OP,CR × DR ,IDR0=SDLF <<
,OP,
,IDR1=SH0 <<
,OP,
,IDR0=SHR6 + LDR0
,OP,
,
,PP,
,IDR1=BDRF + LDR1
,CPU,DU1,, , ;Read of Coefficient(MSB), Data(MSB)
, , ,,
,;
,CPU, ,,
, ;Y × XH,Read of Coefficient(LSB)
, , ,,
, ;Y × XH
, , ,,
, ;Y × XL(shifted 6bit to right)
, , ,,
,;
, , ,,
,;
, , ,,
, ;ODRB: lower 24 bits data
, , ,,ODRB, ;DR1: upper 24 bits data
0180-E-02
- 31 -
1997/12