Datasheet

of the amplifier in dB determined by the maximum gain
setting (Bit 5) or the combination of the maximum gain
setting plus bass boost (see the BassMax Gain-Setting
Components section).
Component Selection
Input-Coupling Capacitor
The AC-coupling capacitor (C
IN
) and internal gain-setting
resistor form a highpass filter that removes any DC bias
from an input signal (see the Functional Diagram/ Typical
Operating Circuit). C
IN
allows the MAX9723 to bias the
Table 7. MAX9723A and MAX9723B Gain
Settings (B5 = 1, Max Gain = 0dB)
Table 8. MAX9723A and MAX9723B Gain
Settings (B5 = 0, Max Gain = -5dB)
B4 B3 B2 B1
B0
(LSB)
GAIN
(dB)
1 1 1 1 1 0
1 1 1 1 0 -0.5
1 1 1 0 1 -1
1 1 1 0 0 -1.5
1 1 0 1 1 -2
1 1 0 1 0 -2.5
1 1 0 0 1 -3
1 1 0 0 0 -4
1 0 1 1 1 -5
1 0 1 1 0 -6
1 0 1 0 1 -7
1 0 1 0 0 -9
1 0 0 1 1 -11
1 0 0 1 0 -13
1 0 0 0 1 -15
1 0 0 0 0 -17
0 1 1 1 1 -19
0 1 1 1 0 -21
0 1 1 0 1 -23
0 1 1 0 0 -25
0 1 0 1 1 -27
0 1 0 1 0 -29
0 1 0 0 1 -31
0 1 0 0 0 -33
0 0 1 1 1 -35
0 0 1 1 0 -37
0 0 1 0 1 -39
0 0 1 0 0 -41
0 0 0 1 1 -43
0 0 0 1 0 -45
0 0 0 0 1 -47
0 0 0 0 0 MUTE
B4 B3 B2 B1
B0
(LSB)
GAIN
(dB)
1 1 1 1 1 -5
1 1 1 1 0 -6
1 1 1 0 1 -7
1 1 1 0 0 -9
1 1 0 1 1 -11
1 1 0 1 0 -13
1 1 0 0 1 -15
1 1 0 0 0 -17
1 0 1 1 1 -19
1 0 1 1 0 -21
1 0 1 0 1 -23
1 0 1 0 0 -25
1 0 0 1 1 -27
1 0 0 1 0 -29
1 0 0 0 1 -31
1 0 0 0 0 -33
0 1 1 1 1 -35
0 1 1 1 0 -37
0 1 1 0 1 -39
0 1 1 0 0 -41
0 1 0 1 1 -43
0 1 0 1 0 -45
0 1 0 0 1 -47
0 1 0 0 0 -51
0 0 1 1 1 -55
0 0 1 1 0 -59
0 0 1 0 1 -63
0 0 1 0 0 -67
0 0 0 1 1 -71
0 0 0 1 0 -75
0 0 0 0 1 -79
0 0 0 0 0 MUTE
MAX9723 Stereo DirectDrive Headphone Amplier
with BassMax, Volume Control, and I
2
C
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