max9856 Maxim Integrated Products, Inc., max9856 Datasheet - Page 34

• Manufacturer Part Number: max9856
• Description: Max9856 Low-power Audio Codec With Directdrive Headphone Amplifiers
• Manufacturer: Maxim Integrated Products, Inc.

Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
Audio Input Register Bit Description (continued)
34
PGAENL/PGAENR
______________________________________________________________________________________
LMIC DIF
PGAML/
PGAMR
MBSEL
MMIC
BITS
Left/Right Programmable Gain Adjustment for Microphone Inputs. When AGC is enabled, the PGALM and
PGARM bits cannot be manually programmed. The PGALM register can be monitored to determine the gain
set by the AGC.
Left/Right Microphone Preamplifier Enable. Enables the microphone circuitry and sets the preamplifier gain:
00—Microphones disabled
01—0dB
10—20dB
11—30dB
Microphone Mute Enable
MICBIAS Voltage Select:
0—MICBIAS = 1.5V
1—MICBIAS = 2.4V (use only when AVDD ≥ 2.7V)
Left Microphone Input Select:
0—MICL/MICGND (pseudo-differential input)
1—INLP/INLN (differential input)
SETTING
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
GAIN (dB)
MICROPHONE PGA SETTINGS
+20
+19
+18
+17
+16
+15
+14
+13
+12
+11
+10
FUNCTION
0x14 to 0x1F
SETTING
0x0C
0x0D
0x0B
0x0E
0x0F
0x10
0x11
0x12
0x13
—
GAIN (dB)
+9
+8
+7
+6
+5
+4
+3
+2
+1
—
0