ak4647vq AKM Semiconductor, Inc., ak4647vq Datasheet - Page 27

• Manufacturer Part Number: ak4647vq
• Description: Stereo Codec With Mic/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
„ Digital High Pass Filter
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.
„ MIC/LINE Input Selector
The AK4647 has input selector. When MDIF1 and MDIF2 bits are “0”, INL and INR bits select LIN1/LIN2 and
RIN1/RIN2, respectively. When MDIF1 and MDIF2 bits are “1”, LIN1, RIN1, LIN2 and RIN2 pins become IN1 , IN1+,
IN2+ and IN2 pins respectively. In this case, full-differential input is available (Figure 22). When full-differential input
is used, the signal should not be input to the pins marked by “X” in.
MS0566-E-00
MDIF1 bit
Others
0
0
0
0
0
1
1
Table 16. Handling of MIC/Line Input Pins (“-“: N/A; “X”: Signal should not be input.)
MDIF2 bit
MDIF1 bit
0
0
0
0
1
0
1
Register
0
0
1
1
MDIF2 bit
INL bit
Table 15. MIC/Line In Path Select
0
0
1
0
0
0
0
0
1
0
1
LIN1
IN1
Pin
- 27 -
O
O
O
O
INR bit
0
1
0
1
0
1
0
RIN1
IN1+
O
X
O
O
LIN2
IN2+
IN1+/
IN1+/
LIN1
LIN1
LIN2
LIN2
LIN1
O
O
X
O
N/A
Lch
RIN2
IN2
O
O
O
O
IN2+/
IN2+/
RIN1
RIN2
RIN1
RIN2
RIN2
N/A
Rch
Default
[AK4647]
2006/11