AK2331 Datasheet, PDF (13/17 Pages) Asahi Kasei Microsystems – DAC Type 8-bit 4-channel Electronic Volume

[AK2331]
2.2) VREF registers
Address
A3 A2 A1 A0
1
0
0
0
Initial value
D7
DA3REF1
0
D6
DA3REF0
0
D5
DA2REF1
0
Data
D4
D3
DA2REF0 DA1REF1
0
0
D2
DA1REF0
0
D1
DA0REF1
0
D0
DA0REF0
0
DA3REF1
to
DA0REF1
0
0
1
1
DA3REF0
to
DA0REF0
0
1
0
1
DAC reference voltage
VSS (internal)
AVDD (internal)
AVDD/2 (internal)
VREF (external)
Remarks
2.3) AVDD/2 register
Address
Data
A3 A2 A1 A0
D7
D6
D5
D4
D3
D2
D1
D0
1
0
1
0
－
－
－
－
AVDD2O3 AVDD2O2 AVDD2O1 AVDD2O0
Initial value
0
0
0
0
0
0
0
0
Data
Item
Function
0
1
Remarks
AVDD2O3 Internal AVDD/2
to
AVDD2O0 output
DAC output
Bypasses the DAC and
outputs the AVDD/2 level
through buffer.
Note Internal generated AVDD/2 level can be output to VOUT0 to VOUT3 pins by setting this register.
2.4) BUFON register
Address
Data
A3 A2 A1 A0
D7
D6
D5
D4
D3
D2
D1
D0
1
0
1
1
－
－
－
－
BUFON3 BUFON2 BUFON1 BUFON0
Initial value
0
0
0
0
0
0
0
0
Data
Item
BUFON3
to
BUFON0
DAC buffer
operation
Function
0
Powers down buffer and
outputs Hi-Z.
1
Buffer output
Remarks
2.5) Software reset register
Address
Data
A3 A2 A1 A0
D7
D6
D5
D4
D3
D2
D1
D0
1
1
0
0
SRST[7:0]
Initial value
0
0
0
0
0
0
0
0
When the SRST[7:0] register is set to 0xAA (10101010), a software reset is performed.
This setting initializes all registers.
Upon completion of a software reset, the register is set to 0.
MS0903-E-00
- 13 -
2008/03