max9856 Maxim Integrated Products, Inc., max9856 Datasheet - Page 36

• 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
Table 13. Audio Output Control Registers
Audio Output Register Bit Description
36
REGISTER
______________________________________________________________________________________
HPVOLL/HPVOLR
0x1A
0x18
0x19
HPMODE
HPMUTE
AUXMIX
AUXDC
VSEN
BITS
B7
0
0
0
Headphone Mute Enable
Headphone Volume Control
Volume Slewing Enable. Enables volume slewing so that when a volume change is made, the actual
volume control steps though all intermediate settings to give a smooth sounding change.
Auxiliary Input DC Measurement Mode:
0—AUXIN connected to the input PGA for audio signals.
1—AUXIN directly connected to the ADC input for DC measurements.
Set MXINL to 1000 for proper operation.
Auxiliary Input Connected to Headphone Amplifiers:
0—AUXIN not connected to the headphone amplifiers.
1—AUXIN mixed directly into the headphone amplifiers bypassing the output mixer.
Headphone Output Mode:
00—Shutdown
01—Standard mono mode (HPL = mono, HPR = shutdown)
10—Dual mono mode (HPL = HPR = mono)
11—Stereo mode
HPMUTE
SETTING
VSEN
0x0C
0x0D
0x0A
0x0B
B6
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0
AUXDC
B5
GAIN (dB)
HEADPHONE VOLUME-CONTROL SETTINGS
+5.5
+4.5
+3.5
+2.5
+5
+4
+3
+2
+1
-1
-2
-4
-6
0
AUXMIX
B4
SETTING
0x1A
0x1B
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
FUNCTION
B3
0
HPVOLR
HPVOLL
GAIN (dB)
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
-8
B2
0
0x28 to 0x3F
SETTING
0x1C
0x1D
0x1E
0x1F
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
—
B1
HPMODE
GAIN (dB)
Mute
-36
-38
-40
-42
-46
-50
-54
-58
-62
-66
-70
-74
—
B0