Datasheet

MAX9867
Ultra-Low Power Stereo Audio Codec
______________________________________________________________________________________ 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 Registers (continued)