ak4644 AKM Semiconductor, Inc., ak4644 Datasheet - Page 35

• Manufacturer Part Number: ak4644
• Description: Stereo Codec With Mic/hp/rcv-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
PMADL, PMADR and MIX bits set mono/stereo ADC operation. When MIX bit = “1”, EQ and FIL3 bits should be set to
“0”. ALC operation (ALC bit = “1”) or digital volume operation (ALC bit = “0”) is applied to the data in Table 19.
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 0.9Hz
(@fs=44.1kHz) and scales with sampling rate (fs). When PMADL bit = “1” or PMADR bit = “1”, the HPF of ADC is
enabled but the HPF of DAC is disabled. When PMADL=PMADR bits = “0”, PMDAC bit = “1”, the HPF of DAC is
enabled but the HPF of ADC is disabled.
MS0477-E-01
Mono/Stereo Mode
Digital High Pass Filter
PMADL bit
LRCK
BICK(32fs)
SDTO(o)
BICK(64fs)
SDTO(o)
SDTI(i)
SDTI(i)
0
0
1
1
PMADR bit
0
0 1
0
0
1
15 14
15 14
15 14
15
15:MSB, 0:LSB
0
1
0
1
2 3
2 3
Table 19. Mono/Stereo ADC operation (x: Don’t care)
14
Lch Data
MIX bit
8
8
2
2 1
15
9
7
7 6 5 4 3 2 1 0
1
x
x
x
0
1
10
16
Figure 31. Mode 3 Timing
6 5 4 3
0
0
11 12 13 14 15 0 1 2 3
17 18
Don't Care
Rch Input Signal
Lch Input Signal
Lch Input Signal
- 35 -
ADC Lch data
2
(L+R)/2
31 0 1 2 3
All “0”
1 0
15 14
15 14
15
15 14
14
Rch Input Signal
Rch Input Signal
Lch Input Signal
Rch Data
ADC Rch data
8
2 1 0
2 1
8
15
9
7 6 5 4 3 2 1 0
(L+R)/2
7 6 5 4 3 2 1 0
All “0”
10
16 17 18
0
11 12 13 14 15
Don't Care
31
Default
0
0
1
1
[AK4644]
2006/10