AK4650 Datasheet, PDF (25/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
■ MIC Input
AK4650
ATTM bit
ATT
MICM bit
MOUT+/−
INT pin
EXT pin
ALC1 bit
MDIF bit MGAIN bit IPGA5-0 bits
MSEL bit _{+20dB/0dB IPGA with ALC}
ATTS2-0 bits _{MICL bit}
ATT
MICAD bit
HP, SP
ADC
MICOUT pin
AIN pin
Figure 16. Microphone Input
The AK4650 has the following functions for Mic Input.
(1) 2 Inputs Selector. The switch configure is controlled by MDIF and MSEL bits (Table 9).
(2) 1^st MIC Amplifier with +20dB gain, The gain can be selected ON/OFF by MGAIN bit (Table 10).
(3) IPGA with ALC. This volume is controlled by IPGA5-0 bits (Table 14).
(4) Attenuator for stereo mixer. The volume is controlled by ATTS2-0 bits (Table 7).
(5) Attenuator for mono mixer. The attenuator level is 4dB and the ON/OFF is controlled by ATTM bit (Table 8).
ATTS2-0
Attenuation
STEP
0H
−6dB
1H
−9dB
2H
−12dB
(default)
3H
−15dB
3dB
4H
−18dB
5H
−21dB
6H
−24dB
7H
−27dB
Table 7. Attenuator Table (IPGA → Stereo Mixer)
ATTM
Attenuation
0
0dB
(default)
1
−4dB
Table 8. Attenuator Table (IPGA → Mono Mixer)
MS0502-E-01
- 25 -
2007/04