ak4642e AKM Semiconductor, Inc., ak4642e Datasheet - Page 31

• Manufacturer Part Number: ak4642e
• Description: Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
The AK4642 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 21).
MS0420-E-00
Digital High Pass Filter
MIC/LINE Input Selector
MDIF1 bit
0
1
LIN1/IN1− pin
RIN1/IN1+ pin
RIN2/IN2− pin
LIN2/IN2+ pin
MDIF2 bit
0
1
0
1
AK4642
INL bit
Figure 20. Mic/Line Input Selector
Table 15. MIC/Line In Path Select
0
1
0
1
x
x
MDIF1 bit
MDIF2 bit
INR bit
INL bit
- 31 -
INR bit
0
1
0
1
x
x
0
1
x
IN1+/−
IN1+/−
LIN1
LIN1
LIN2
LIN2
LIN1
N/A
N/A
Lch
ADC Lch
ADC Rch
IN2+/−
IN2+/−
RIN1
RIN2
RIN1
RIN2
RIN2
N/A
N/A
Rch
[AK4642EN]
Default
2005/09