ak5702 AKM Semiconductor, Inc., ak5702 Datasheet - Page 36

• Manufacturer Part Number: ak5702
• Description: 4-channel Adc With Pll & Mic-amp
• Manufacturer: AKM Semiconductor, Inc.

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PMADAL, PMADAR and MIXA bits select mono or stereo mode of ADCA output data. PMADBL, PMADBR and
MIXB bits select mono or stereo mode of ADCB output data. ALC operation (ALC bit = “1”) or digital volume operation
(ALC bit = “0”) is applied to the data in Table 18 and Table 19.
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The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is selected by
HPFA1-0 and HPFB1-0 bits (Table 20, Table 21) and scales with sampling rate (fs). The default value is 3.4Hz
(@fs=44.1kHz).
MS0623-E-00
Mono/Stereo Selection
Digital High Pass Filter
PMADAL bit
PMADBL bit
HPFA1 bit
HPFB1 bit
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
PMADBR bit
PMADAR bit
HPFA0 bit
HPFB0 bit
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Table 18. ADCA Mono/Stereo Selection (x: Don’t care)
Table 19. ADCB Mono/Stereo Selection (x: Don’t care)
Table 20. ADCA Digital HPF Cut-off Frequency
Table 21. ADCB Digital HPF Cut-off Frequency
MIXB bit
MIXA bit
fs=44.1kHz
fs=44.1kHz
213.9Hz
13.6Hz
213.9Hz
3.4Hz
6.8Hz
13.6Hz
x
x
x
0
1
3.4Hz
6.8Hz
x
x
x
0
1
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Rch Input Signal
Lch Input Signal
Lch Input Signal
Rch Input Signal
ADCB Lch data
Lch Input Signal
Lch Input Signal
ADCA Lch data
fs=22.05kHz
(L+R)/2
(L+R)/2
All “0”
fs=22.05kHz
All “0”
109.7Hz
109.7Hz
1.7Hz
3.4Hz
6.8Hz
1.7Hz
3.4Hz
6.8Hz
fc
fc
Rch Input Signal
fs=11.025kHz
Lch Input Signal
Rch Input Signal
Rch Input Signal
Rch Input Signal
ADCB Rch data
Lch Input Signal
ADCA Rch data
fs=11.025kHz
0.85Hz
54.8Hz
1.7Hz
3.4Hz
0.85Hz
54.8Hz
(L+R)/2
(L+R)/2
1.7Hz
3.4Hz
All “0”
All “0”
(default)
(default)
(default)
(default)
[AK5702]
2007/06