Rainbow Electronics MAX9796 - Manual (Page 22)

MAX9796
Mono/Left/Right Volume Control
The MAX9796 has separate volume control for each of
the internal signals: left (L), right (R), and mono (M). The
final gain of each signal is determined by the way the
following bits are set: MVOL, LVOL, RVOL, INA+20dB,
IN+6dB, and MONO+6dB. Table 7 shows how to config-
ure the L, R, and M amplifiers for specific gains.
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
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PROGRAMMING MODE INTERNAL SIGNALS LEFT (L), RIGHT (R), AND MONO (M)
INMODE
B3 B2 B1 B0
L R M
0 0 0 0 INA1 + INB1 + INC1 INA2 + INB2 + INC2 —
0 0 0 1 INA1 + INB1 INA2 + INB2 INC1 - INC2
0 0 1 0 INA1 + INC1 INA2 + INC2 INB1 - INB2
0 0 1 1 INA1 INA2
(INB1 - INB2) + (INC1 -
INC2)
0 1 0 0 INA1 + (INC1 - INC2) INA2 + (INB1 - INB2) —
0 1 0 1 INA1 + (INB1 - INB2) INA2 + (INC1 - INC2) —
0 1 1 0 INB1 + INC2 INB2 + INC2 INA1 - INA2
0 1 1 1 INB1 INB2
(INA1 - INA2) + (INC1 -
INC2)
1 0 0 0 INC1 INC2
(INA1 - INA2) + (INB1 -
INB2)
1 0 0 1 — —
(INA1 - INA2) + (INB1 -
INB2)
1 0 1 0 INC1 - INC2 INB1 - INB2 INA1 - INA2
1 0 1 1 INB1 - INB2 INC1 - INC2 INA1 - INA2
Table 5b. Internal Signals L, R, and M
B7 B6 B5 B4 B3 B2 B1 B0
Mono Volume Control 0 0 1 MVOL
Left Volume Control 0 1 0 LVOL
Right Volume Control 0 1 1 RVOL
Table 6. Mono/Left/Right Volume Control Registers
MVOL/LVOL/RVOL
B4 B3 B2 B1 B0
GAIN (dB)
0 0 0 0 0 Mute
0 0 0 0 1 -75
0 0 0 1 0 -71
0 0 0 1 1 -67
0 0 1 0 0 -63
0 0 1 0 1 -59
0 0 1 1 0 -55
0 0 1 1 1 -51
MVOL/LVOL/RVOL
B4 B3 B2 B1 B0
GAIN (dB)
0 1 0 0 0 -47
0 1 0 0 1 -44
0 1 0 1 0 -41
0 1 0 1 1 -38
0 1 1 0 0 -35
0 1 1 0 1 -32
0 1 1 1 0 -29
0 1 1 1 1 -26
Table 7. Volume Control Settings