ak4640 ETC-unknow, ak4640 Datasheet - Page 29
ak4640
Manufacturer Part Number
ak4640
Description
16bit Codec With /hp/spk-ampl
Manufacturer
ETC-unknow
Datasheet
1.AK4640.pdf
(76 pages)
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ASAHI KASEI
AK4640 has a Gain Amplifier for Microphone input. This gain is 0dB or +20dB, selected by the MGAIN bit (Table 14).
The typical input impedance is 30kΩ.
The MPI and MPE pins supply power for the Microphone. These output voltages are 0.75 x AVDD (typ) and the load
resistance is 2kΩ(min). No capacitor must be connected directly to MPI and MPE pins.
MS0273-E-00
MIC Gain Amplifier
MIC Power
MIC Power
MIC-Amp
MGAIN bit
0
1
Table 14. MIC Input Gain
Figure 19. MIC Power
MPI/MPE
INT/EXT
Input Gain
- 29 -
+20dB
0dB
≥ 2kΩ
Default
Microphone
[AK4640]
2004/03
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