AK4536 Datasheet, PDF (29/59 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4536]
FCK
0 1 23 4
BICK(32fs)
9 10 11 12 13 14 15 0 1 2 3 4
9 10 11 12 13 14 15 0 1
SDTO(o)
15 14 13 7 7 6 5 4 3 2 1 0
SDTI(i)
15 14 13
7 6 54 32 1 0
0 1 23 4
BICK(64fs)
14 15 16 17 18
31 0 1 2 3 4 14 15 16 17 18
SDTO(o)
15 14 13
21 0
31 0 1
SDTI(i)
15 14 13
2 10
Don’t Care
15:MSB, 0:LSB
Data
1/fs
Figure 27. Mode 3 Timing
Don’t Care
n Digital High Pass Filter
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 1.25Hz (@fs=8kHz)
and scales with sampling rate (fs).
n MIC Gain Amplifier
AK4536 has a Gain Amplifier for Microphone input. This gain is 0dB or 20dB, selected by the MGAIN bit. The typical
input impedance is 30kΩ.
MGAIN bit
Input Gain
0
0dB
1
+20dB
Table 14. Input Gain
Default
n MIC Power
The MPI pin supplies power for the Microphone. This output voltage is typically 0.75 x AVDD and the maximum output
current is 1.25mA.
MS0174-E-00
- 29 -
2002/09