max9796 Maxim Integrated Products, Inc., max9796 Datasheet - Page 21

• Manufacturer Part Number: max9796
• Description: Max9796 2.3w, High-power Class D Audio Subsystem With Directdrive Headphone Amplifiers
• Manufacturer: Maxim Integrated Products, Inc.

The MAX9796 has three flexible inputs that can be con-
figured as single-ended stereo inputs or differential
mono inputs. All input signals are summed into three
unique signals, Left (L), Right (R), and Mono (M), which
are routed to the output amplifiers. The bit B4 allows
the option of boosting low-level signals on INA. B4 can
be set as follows:
Table 3. Power-On Reset Conditions
Table 4. Input Mode Control Register
Table 5a. Input Mode
Input Mode Control
Input Mode (000)
Mono Volume (001)
Left Volume (010)
Right Volume (011)
Output Mode (100)
Global Control Register (101)
B3
0
0
0
0
0
0
0
0
1
1
1
1
COMMAND
PROGRAMMING MODE
2.3W, High-Power Class D Audio Subsystem
B2
0
0
0
0
1
1
1
1
0
0
0
0
INMODE
______________________________________________________________________________________
with DirectDrive Headphone Amplifiers
B1
0
0
1
1
0
0
1
1
0
0
1
1
DATA
10000
11111
11111
11111
01000
00011
B7
B0
Input Mode Control
0
0
1
0
1
0
1
0
1
0
1
0
1
Input A gain = +20dB; input A, B, and C singled-ended stereo inputs
Maximum volume
Maximum volume
Maximum volume
Mode 8: stereo headphone, mono speaker
Powered-off, input B/C gain = 0dB, MUTE off, SSM on, MONO on
B6
INA1
0
M+
M+
M+
M+
M+
M+
L
L
L
L
L
L
B5
0
INA2
M-
M-
M-
M-
M-
M-
R
R
R
R
R
R
1 = Input A’s gain +20dB for low-level signals such as
FM receivers.
0 = Input A’s gain is either 0dB or +6dB as set by
IN+6dB (bit B3 of the Control Register).
Tables 5a and 5b show how the inputs–INA, INB, and
INC–are mixed to create the internal signals left (L),
right (R), and mono (M).
INA+20dB
B4
INPUT CONFIGURATION
INB1
M+
M+
M+
M+
R+
R+
L+
L+
L
L
L
L
DESCRIPTION
B3
INMODE (Tables 5a and 5b )
INB2
M-
M-
M-
M-
R-
R-
L-
L-
R
R
R
R
B2
INC1
M+
M+
M+
M+
L+
R+
L+
R+
L
L
L
L
B1
INC2
M-
M-
M-
M-
R-
R-
L-
L-
R
R
R
R
B0
21