Max9867 ultra-low power stereo audio codec, Table 12. microphone input register (continued) – Rainbow Electronics MAX9867 User Manual
Page 39
MAX9867
Ultra-Low Power Stereo Audio Codec
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39
BITS
FUNCTION
PALEN/PAREN
Left/Right Microphone Preamplifier Gain
Enables the microphone circuitry and sets the preamplifier gain.
00 = Disabled
01 = 0dB
10 = +20dB
11 = +30dB
Left/Right Microphone Programmable Gain Amplifier
SETTING
GAIN (dB)
SETTING
GAIN (dB)
0x00
+20
0x0B
+9
0x01
+19
0x0C
+8
0x02
+18
0x0D
+7
0x03
+17
0x0E
+6
0x04
+16
0x0F
+5
0x05
+15
0x10
+4
0x06
+14
0x11
+3
0x07
+13
0x12
+2
0x08
+12
0x13
+1
0x09
+10
PGAML/PGAMR
0x0A
+11
0x14
to 0x1F
0
MICLN
MICLP
MICBIAS
PGA
PGA
-
PREAMP
MICRN
ADC
L
MICRP
1.5V
0/20/30dB
0dB TO +20dB
0dB TO +20dB
V
REG
V
REG
0/20/30dB
PREAMP
MAX9867
ADC
R
Figure 5. Microphone Input Signal Path
Table 12. Microphone Input Register (continued)