AK7712A-VT Datasheet, PDF (28/87 Pages) Asahi Kasei Microsystems – Built-in 20-bit ADC/DAC Sophisticated Audio DSP

ASAHI KASEI
[AK7712A-VT]
2) Multiplier
Multiplier outputs the 31-bit data for shift circuit as a result of fixed-point calculation(24-bit(data) × 16-bit(coefficient)
= 40-bit). 4 ways of multiplication can operate for the data as follows. The output data is extended from MSB for
reason that the data overflows at -1 × -1. The following combinations are possible for input.
16-bit Input
Coefficient RAM
Coefficient RAM
DBUS
DBUS
24-bit Input
Data RAM
DBUS
Data RAM
DBUS
notes
calculation of X²
16-bit 24-bit
X
Y
Partial Product
Carry Sum
←Input Register
←Partial Product Register
Final Adder
40-bit
Shifter
Multiplication actions always synchronous with CMCK, the product is output in 2 cycles.
0180-E-02
- 28 -
1997/12