AK4440 Datasheet, PDF (21/31 Pages) Asahi Kasei Microsystems – 192kHz 24-Bit 8ch DAC with 2Vrms Output

[AK4440]
■ Register Control Interface
The AK4440’s functions are controlled by registers. Two types of control mode write internal registers. In the I²C-bus
mode, the chip address is determined by the state of the CAD0 pin. In 3-wire mode, the chip address is fixed to “11”.
Writing “0” to the RSTN bit resets the internal timing circuit, but the registers are not initialized.
* The AK4440 does not support read commands.
* When the state of the P/S pin is changed, the AK4440 should be reset by the RSTB bit = “0”.
* In serial control mode, the setting of parallel pins is invalid.
Function
Double sampling mode at 128/192fs
De-emphasis
SMUTE
16/20/24bit LSB justified format
TDM256 mode
TDM128 mode
Parallel Control Mode
-
X
X
-
X
-
Serial Control Mode
X
X
X
X
X
X
Table 11 Function Table (X: Available, -: Not available)
(1) 3-wire Serial Control Mode (I2C pin = “L”)
The 3-wire μP interface pins, CSN, CCLK and CDTI, write internal registers. The data on this interface consists of
Chip Address (2bits, C1/0; fixed to “11”), Read/Write (1bit; fixed to “1”, Write only), Register Address (MSB first,
5bits) and Control Data (MSB first, 8bits). The AK4440 latches the data on the rising edge of CCLK, so data should
clocked in on the falling edge. The writing of data becomes valid by the rising edge of CSN. The clock speed of CCLK
is 5MHz (max).
CSN
CCLK
CDTI
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
C1-C0:
R/W:
A4-A0:
D7-D0:
Chip Address (Fixed to “11”)
READ/WRITE (Fixed to “1”, Write only)
Register Address
Control Data
Figure 21. Control I/F Timing
MS1088-E-01
- 21 -
2011/03