AK4390 Datasheet, PDF (22/32 Pages) Asahi Kasei Microsystems – Ultra Low Latency 32-Bit ΔΣ DAC

[AK4390]
■ Register Control Interface
Pins (parallel control mode) or registers (serial control mode) can control the functions of the AK4390. In parallel control
mode, the register setting is ignored, and in serial control mode the pin settings are ignored. When the state of the PSN pin
is changed, the AK4390 should be reset by the PDN pin. The serial control interface is enabled by the PSN pin = “L”. In
this mode, pin settings must be all “L”. Internal registers may be written to through3-wire µP interface pins: CSN, CCLK
and CDTI. The data on this interface consists of Chip address (2-bits, CAD0/1), Read/Write (1-bit; fixed to “1”), Register
address (MSB first, 5-bits) and Control data (MSB first, 8-bits). The AK4390 latches the data on the rising edge of CCLK,
so data should be clocked in on the falling edge. The writing of data is valid when CSN “↑”. The clock speed of CCLK is
5MHz (max).
Function
Parallel Control Mode Serial Control Mode
Audio Format
Y
Y
De-emphasis
Y
Y
SMUTE
Y
Y
DSD Mode
-
Y
EX DF I/F
-
Y
Short delay Filter
-
Y
Digital Attenuator
-
Y
Table 6. Function List (Y: Available, -: Not available)
Setting the PDN pin to “L” resets the registers to their default values. In serial control mode, the internal timing circuit is
reset by the RSTN bit, but the registers are not initialized.
CSN
CCLK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CDTI
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
C1-C0: Chip Address (C1=CAD1, C0=CAD0)
R/W: READ/WRITE (Fixed to “1”, Write only)
A4-A0: Register Address
D7-D0: Control Data
Figure 11. Control I/F Timing
* The AK4390 does not support the read command.
* When the AK4390 is in power down mode (PDN pin = “L”) or the MCLK is not provided, writing into the control
register is prohibited.
* The control data can not be written when the CCLK rising edge is 15 times or less or 17 times or more during CSN is
“L”.
MS1046-E-00
- 22 -
2009/01