AK4371VN AKM [Asahi Kasei Microsystems], AK4371VN Datasheet - Page 30

• Manufacturer Part Number: AK4371VN
• Description: DAC with built-in PLL & HP-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
The AK4371 includes a digital de-emphasis filter (tc = 50/15μs), using an IIR filter corresponding to three sampling
frequencies (32kHz, 44.1kHz and 48kHz). The de-emphasis filter is enabled by setting DEM1-0 bits (Table 19).
■
By controlling the BST1-0 bits, a low frequency boost signal can be output from DAC. The setting value is common for
both channels (Table 20).
■
MONO1-0 bits select the digital data mixing for the DAC (Table 21).
■
PDN pin should be held to “L” upon power-up. The AK4371 should be reset by bringing PDN pin “L” for 150ns or more.
All of the internal register values are initialized by the system reset. After exiting reset, VCOM, DAC, HPL, HPR, LOUT,
ROUT and MOUT switch to the power-down state. The contents of the control register are maintained until the reset is
completed.
The DAC exits reset and power down states by MCKI after the PMDAC bit is changed to “1”. The DAC is in power-down
mode until MCKI is input.
MS0596-E-00
De-emphasis Filter
Bass Boost Function
Digital Mixing Function
System Reset
MONO1 bit
0
0
1
1
DEM1 bit
BST1 bit
0
0
1
1
0
0
1
1
Table 19. De-emphasis Filter Frequency Select
MONO0 bit
Table 20. Low Frequency Boost Select
0
1
0
1
Table 21. Mixer Setting
DEM0 bit
BST0 bit
0
1
0
1
0
1
0
1
(L+R)/2
- 30 -
Lch
R
L
L
De-emphasis
44.1kHz
BOOST
48kHz
32kHz
MAX
MIN
MID
OFF
OFF
(L+R)/2
Rch
R
L
R
(default)
(default)
(default)
[AK4371]
2007/04