Datasheet

MAX9850
Volume Register (0x2)
Mute Enable (MUTE)
1 = Mute headphone outputs.
0 = Unmute headphone outputs.
Set MUTE = 1 to mute the headphone outputs (HPR,
HPL). The headphone output is muted on the first zero
crossing of the audio signal if zero-crossing detect is
enabled.
Slew-Rate Control Enable (SLEW)
1 = Enable slew-rate control.
0 = Disable slew-rate control.
The slew-rate control allows the headphone amplifiers to
smoothly slew between volume settings after a volume
change is made. Volume changes occur immediately
when the slew-rate control is disabled.
Volume Control (VOL(5:0))
VOL(5:0) controls the headphone amplifier volume
attenuation. Code 0x00 is full volume while 0x28 to 0x3F
is full attenuation. VMN sets to 1 when code 0x3F is pro-
grammed and the minimum volume is reached. Table
13 lists the volume attenuation settings for each code.
Stereo Audio DAC with DirectDrive
Headphone Amplifier
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Table 13. Volume Control Settings
Table 12. Volume (0x2) Read/Write, Bit
Descriptions
B7
B6 B5 B4 B3 B2 B1
B0
MUTE
SLEW
VOL(5:0)
VOL(5:0) SETTING (dB)
0x00 +6.0
0x01 +5.5
0x02 +5.0
0x03 +4.5
0x04 +4.0
0x05 +3.5
0x06 +3.0
0x07 +2.5
0x08 +1.5
0x09 +0.5
0x0A -0.5
0x0B -1.5
0x0C -3.5
0x0D -5.5
VOL(5:0) SETTING (dB)
0x0E -7.5
0x0F -9.5
0x10 -11.5
0x11 -13.5
0x12 -15.5
0x13 -17.5
0x14 -19.5
0x15 -21.5
0x16 -23.5
0x17 -25.5
0x18 -27.5
0x19 -29.5
0x1A -31.5
0x1B -33.5
VOL(5:0) SETTING (dB)
0x1C -35.5
0x1D -37.5
0x1E -39.5
0x1F -41.5
0x20 -45.5
0x21 -49.5
0x22 -53.5
0x23 -57.5
0x24 -61.5
0x25 -65.5
0x26 -69.5
0x27 -73.5
0x28-0x3F Mute
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