ak4529 AKM Semiconductor, Inc., ak4529 Datasheet - Page 20

• Manufacturer Part Number: ak4529
• Description: High Performance Multi-channel Audio Codec
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
n Overflow Detection
The AK4529 has overflow detect function for analog input. Overflow detect function is enable if OVFE bit is set to “1” at
serial control mode. OVF pin goes to “H” if analog input of Lch or Rch overflows (more than -0.3dBFS). OVF output for
overflowed analog input has the same group delay as ADC (GD = 27.6/fs = 626µs@fs=44.1kHz). OVF is “L” for 522/fs
(=11.8ms @fs=44.1kHz) after PDN = “ ”, and then overflow detection is enabled.
n Zero Detection
The AK4529 has two pins for zero detect flag outputs. Channel grouping can be selected by DZFM3-0 bits if P/S = “L”
and DZFE = “L” (table 9). DZF1 pin corresponds to the group 1 channels and DZF2 pin corresponds to the group 2
channels. However DZF2 pin becomes OVF pin if OVFE bit is set to “1”. Zero detection mode is set to mode 0 if DZFE=
“H” regardless of P/S pin. DZF1 is AND of all eight channels and DZF2 is disabled (“L”) at mode 0. Table 10 shows the
relation of P/S, DZFE, OVFE and DZF.
When the input data of all channels in the group 1(group 2) are continuously zeros for 8192 LRCK cycles, DZF1(DZF2)
pin goes to “H”. DZF1(DZF2) pin immediately goes to “L” if input data of any channels in the group 1(group 2) is not
zero after going DZF1(DZF2) “H”.
MS0082-E-00
Mode
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
“H” (parallel mode)
“L” (serial mode)
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
P/S pin
DZFM
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DZF1
DZF1
DZF1
DZF1
DZF1
DZF1
DZF2
DZF1
DZF1
DZFE pin
L1
“L”
“H”
“L”
“H”
DZF1
DZF1
DZF1
DZF1
DZF1
DZF2
DZF2
DZF1
DZF1
R1
Table 10. DZF1-2 pins outputs
Table 9. Zero detect control
OVFE bit
disable
disable
“0”
“1”
“0”
“1”
DZF1
DZF1
DZF1
DZF1
DZF2
DZF2
DZF2
DZF1
DZF1
L2
disable (DZF1=DZF2 = “L”)
disable (DZF1=DZF2 = “L”)
- 20 -
DZF1
DZF1
DZF1
DZF2
DZF2
DZF2
DZF2
DZF1
DZF1
R2
DZF mode
Selectable
Selectable
Mode 7
Mode 0
Mode 0
Mode 0
AOUT
DZF1
DZF1
DZF2
DZF2
DZF2
DZF2
DZF2
DZF1
DZF1
L3
AND of 6ch
AND of 6ch
AND of 6ch
Selectable
Selectable
DZF1 pin
DZF1
DZF2
DZF2
DZF2
DZF2
DZF2
DZF2
DZF1
DZF1
R3
“L”
DZF1
DZF2
DZF2
DZF2
DZF2
DZF2
DZF2
DZF1
DZF2
L4
DZF2/OVF pin
OVF output
OVF output
Selectable
DZF1
DZF2
DZF2
DZF2
DZF2
DZF2
DZF2
DZF2
DZF2
R4
“L”
“L”
“L”
Default
[AK4529]
2001/3