MAX9776EVKIT+ Maxim Integrated Products, MAX9776EVKIT+ Datasheet - Page 28

• Manufacturer Part Number: MAX9776EVKIT+
• Description: EVALUATION KIT FOR MAX9776
• Manufacturer: Maxim Integrated Products
• Series: DirectDrive™r

Specifications of MAX9776EVKIT+

• Amplifier Type: Class D
• Output Type: 1-Channel (Mono) with Stereo Headphones
• Max Output Power X Channels @ Load: 1.5W x 1 @ 4 Ohm; 60mW x 2 @ 16 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: MAX9776
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX9775/MAX9776 have three flexible inputs that
can be configured as single-ended stereo inputs or dif-
ferential 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
INA+20dB allows the option of boosting low-level sig-
nals on INA. INA+20dB can be set as follows:
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Table 4. Input Mode Control Register
Table 5a. Input Mode
Table 5b. Internal Signals L, R, and M
28
Input Mode Control
B3
0
0
0
0
0
0
0
0
1
1
1
1
B3
PROGRAMMING MODE
______________________________________________________________________________________
0
0
0
0
0
0
0
0
1
1
1
1
B2
0
0
0
0
1
1
1
1
0
0
0
0
REGISTER
INMODE
PROGRAMMING MODE
B2
0
0
0
0
1
1
1
1
0
0
0
0
B1
0
0
1
1
0
0
1
1
0
0
1
1
INMODE
B0
0
1
0
1
0
1
0
1
0
1
0
1
B1
0
0
1
1
0
0
1
1
0
0
1
1
INA1 + (INC1 - INC2)
INA1 + (INB1 - INB2)
INA1 + INB1 + INC1
B7
0
INA1 + INB1
INA1 + INC1
INB1 + INC1
INC1 - INC2
INB1 - INB2
B0
0
1
0
1
0
1
0
1
0
1
0
1
INA1
INB1
INC1
—
L
B6
0
INTERNAL SIGNALS LEFT (L), RIGHT (R), AND MONO (M)
INA1
M+
M+
M+
M+
M+
M+
L
L
L
L
L
L
B5
0
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).
INA2
M-
M-
M-
M-
M-
M-
R
R
R
R
R
R
INA2 + (INC1 - INC2)
INA2 + (INB1 - INB2)
INA2 + INB2 + INC2
INA+20dB
INA2 + INC2
INB2 + INC2
INA2 + INB2
INC1 - INC2
INB1 - INB2
B4
INPUT CONFIGURATION
INC2
INA2
INB2
—
R
INB1
M+
M+
M+
M+
R+
R+
L+
L+
L
L
L
L
B3
INMODE (Tables 5a and 5b )
INB2
M-
M-
M-
M-
R-
R-
L-
L-
R
R
R
R
(INB1 - INB2) + (INC1 - INC2)
(INA1 - INA2) + (INC1 - INC2)
(INA1 - INA2) + (INB1 - INB2)
(INA1 - INA2) + (INB1 - INB2)
B2
Input Mode Control
+ (INC1 - INC2)
INC1
INC1 - INC2
INB1 - INB2
INA1 - INA2
INA1 - INA2
INA1 - INA2
M+
M+
M+
M+
L+
R+
L+
R+
L
L
L
L
B1
—
—
—
M
INC2
M-
M-
M-
M-
R-
R-
L-
L-
R
R
R
R
B0