Rainbow Electronics MAX9867 - Manual (Page 35)

MAX9867
Ultra-Low Power Stereo Audio Codec
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Digital Gain Control
The MAX9867 includes digital gain adjustment for the
playback and record paths. Independent gain adjust-
ment is provided for the two record channels. Sidetone
gain adjustment is also provided to set the sidetone
level relative to the playback level. Table 9 is the digital
gain registers.
REGISTER B7 B6 B5 B4 B3 B2 B1 B0
REGISTER
ADDRESS
Sidetone DSTS 0 DVST 0x0B
DAC Level 0 DACM DACG DACA 0x0C
ADC Level AVL AVR 0x0D
BITS FUNCTION
DSTS
Digital Sidetone Source Mixer
00
= No sidetone is selected.
01 = Left ADC
10 = Right ADC
11 = Left + right ADC
Digital Sidetone Level Control
All gain settings are relative to the ADC input voltage.
Differential Headphone Output Mode
SETTING GAIN (dB) SETTING GAIN (dB) SETTING GAIN (dB)
0x00 Off 0x0B -20 0x16 -42
0x01 0 0x0C -22 0x17 -44
0x02 -2 0x0D -24 0x18 -46
0x03 -4 0x0E -26 0x19 -48
0x04 -6 0x0F -28 0x1A -50
0x05 -8 0x10 -30 0x1B -52
0x06 -10 0x11 -32 0x1C -54
0x07 -12 0x12 -34 0x1D -56
0x08 -14 0x13 -36 0x1E -58
0x09 -16 0x14 -38 0x1F -60
0x0A -18 0x15 -40 — —
Capacitorless and Single-Ended Headphone Output Mode
SETTING GAIN (dB) SETTING GAIN (dB) SETTING GAIN (dB)
0x00 Off 0x0B -25 0x16 -47
0x01 -5 0x0C -27 0x17 -49
0x02 -7 0x0D -29 0x18 -51
0x03 -9 0x0E -31 0x19 -53
0x04 -11 0x0F -33 0x1A -55
0x05 -13 0x10 -35 0x1B -57
0x06 -15 0x11 -37 0x1C -59
0x07 -17 0x12 -39 0x1D -61
0x08 -19 0x13 -41 0x1E -63
0x09 -21 0x14 -43 0x1F -65
DVST
0x0A -23 0x15 -45 — —
DACM
DAC Mute Enable
0 = No mute
1 = Mute
Table 9. Digital Gain Registers