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MAX9729ETI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
______________________________________________________________________________________ 19
A
V_TOTAL
(dB)
B4 B3 B2 B1 B0
ATTEN FROM
MAX GAIN
SETTING (dB)
WITH A
V
_
MAX
= +10dB WITH A
V
_
MAX
= +19.5dB WITH A
V
_
MAX
= +22dB
0 0 0 0 0 -0 +10 +19.5 +22
0 0 0 0 1 -1.7 +8.3 +17.8 +20.3
0 0 0 1 0 -3.4 +6.6 +16.1 +18.6
0 0 0 1 1 -4.8 +5.2 +14.7 +17.2
0 0 1 0 0 -6.2 +3.8 +13.3 +15.8
0 0 1 0 1 -7.6 +2.4 +11.9 +14.4
0 0 1 1 0 -9 +1 +10.5 +13
0 0 1 1 1 -10.4 -0.4 +9.1 +11.6
0 1 0 0 0 -11.8 -1.8 +7.7 +0.2
0 1 0 0 1 -13.2 -3.2 +6.3 +8.8
0 1 0 1 0 -14.6 -4.6 +4.9 +7.4
0 1 0 1 1 -16 -6 +3.5 +6
0 1 1 0 0 -17.4 -7.4 +2.1 +4.6
0 1 1 0 1 -18.8 -8.8 +0.7 +3.2
0 1 1 1 0 -20.2 -10.2 -0.7 +1.8
0 1 1 1 1 -21.6 -11.6 -2.1 +0.4
1 0 0 0 0 -23.1 -13.1 -3.6 -1.1
1 0 0 0 1 -24.4 -14.4 -4.9 -2.4
1 0 0 1 0 -26 -16 -6.5 -4
1 0 0 1 1 -27.1 -17.1 -7.6 -5.1
1 0 1 0 0 -28.6 -18.6 -9.1 -6.6
1 0 1 0 1 -30.1 -20.1 -10.6 -8.1
1 0 1 1 0 -32.3 -22.3 -12.8 -10.3
1 0 1 1 1 -35.1 -25.1 -15.6 -13.1
1 1 0 0 0 -38.6 -28.6 -19.1 -16.6
1 1 0 0 1 -42.1 -32.1 -22.6 -20.1
1 1 0 1 0 -46.2 -36.2 -26.7 -24.2
1 1 0 1 1 -50.7 -40.7 -31.2 -28.7
1 1 1 0 0 -54.2 -44.2 -34.7 -32.2
1 1 1 0 1 -60.2 -50.2 -40.7 -38.2
1 1 1 1 0 -70 -60 -50.5 -48
1 1 1 1 1 MUTE MUTE MUTE MUTE
Table 5b. Volume Control (Register 0x00)
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
20 ______________________________________________________________________________________
A
V_TOTAL
(dB)
B4 B3 B2 B1 B0
ATTEN FROM
MAX GAIN
SETTING (dB
WITH A
V_MAX
= +24dB WITH A
V_MAX
= +26dB
0 0 0 0 0 -0 +24 +26
0 0 0 0 1 -1.7 +22.3 +24.3
0 0 0 1 0 -3.4 +20.6 +22.6
0 0 0 1 1 -4.8 +19.2 +21.2
0 0 1 0 0 -6.2 +17.8 +19.8
0 0 1 0 1 -7.6 +16.4 +18.4
0 0 1 1 0 -9 +15 +17
0 0 1 1 1 -10.4 +13.6 +15.6
0 1 0 0 0 -11.8 +12.2 +14.2
0 1 0 0 1 -13.2 +10.8 +12.8
0 1 0 1 0 -14.6 +9.4 +11.4
01011 -16 +8 +10
0 1 1 0 0 -17.4 +6.6 +8.6
0 1 1 0 1 -18.8 +5.2 +7.2
0 1 1 1 0 -20.2 +3.8 +5.8
0 1 1 1 1 -21.6 +2.4 +4.4
1 0 0 0 0 -23.1 +0.9 +2.9
1 0 0 0 1 -24.4 -0.4 +1.6
1 0 0 1 0 -26 -2 +0
1 0 0 1 1 -27.1 -3.1 -1.1
1 0 1 0 0 -28.6 -4.6 -2.6
1 0 1 0 1 -30.1 -6.1 -4.1
1 0 1 1 0 -32.3 -8.3 -6.3
1 0 1 1 1 -35.1 -11.1 -9.1
1 1 0 0 0 -38.6 -14.6 -12.6
1 1 0 0 1 -42.1 -18.1 -16.1
1 1 0 1 0 -46.2 -22.2 -20.2
1 1 0 1 1 -50.7 -26.7 -24.7
1 1 1 0 0 -54.2 -30.2 -28.2
1 1 1 0 1 -60.2 -36.2 -34.2
1 1 1 1 0 -70 -46 -44
1 1 1 1 1 MUTE MUTE MUTE
Table 5c. Volume Control (Register 0x00)
Charge-Pump Flying Capacitor (C1)
The charge-pump flying capacitor connected between
C1N and C1P affects the charge pump’s load regula-
tion and output impedance. Choosing too small a flying
capacitor degrades the MAX9729’s ability to provide
sufficient current drive and leads to a loss of output
voltage. Increasing the value of the flying capacitor
improves load regulation and reduces the charge-
pump output impedance. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance
graph in the
Typical Operating Characteristics
. Place
C1 physically close to C1P and C1N. Use a 1µF capac-
itor for C1 in most applications.
Charge-Pump Hold Capacitor (C2)
The hold capacitor’s value and ESR directly affect the
ripple at PV
SS
. Ripple is reduced by increasing the
value of the hold capacitor. Choosing a capacitor with
lower ESR reduces ripple and output impedance. Lower
capacitance values can be used in systems with low
maximum output power levels. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance graph
in the
Typical Operating Characteristics
. C2 should be
equal to the value of C1. Place C2 physically close to
PV
SS
and SV
SS
. Connect PV
SS
and SV
SS
together at
C2. Use a 1µF capacitor for C2 in most applications.
PV
DD
Bypass Capacitor (C3)
The PV
DD
bypass capacitor lowers the output imped-
ance of the power supply and reduces the impact of
the MAX9729’s charge-pump switching transients. C3
should be greater than or equal to C1. Place C3 physi-
cally close to PV
DD
.
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
______________________________________________________________________________________ 21
100
70
80
90
50
60
10
20
30
40
0
0 5 10 15 20 25 30 35
MAX9729 VOLUME CONTROL
TRANSFER FUNCTION
CODE (DECIMAL)
ATTENUATION (dB)
Figure 8. MAX9729 Volume Control Transfer Function
B7 B6 B5 BEEP LEVEL (dBV)
0 0 0 -10
0 0 1 -20
0 1 0 -30
0 1 1 -40
1 0 0 -50
1 0 1 -52
1 1 0 -54
1 1 1 -56
Table 6. Beep Level (Register 0x01)
BEEP level referenced to a 3V BEEP input.
B3 MODE
0 BassMax Disabled
1 BassMax Enabled
Table 7. BassMax Control (Register 0x01)
B2 B1 B0 MAXIMUM GAIN (dB)
0 0 0 3.5
001 6
010 8
011 10
1 0 0 19.5
101 22
110 24
111 26
Table 8. Maximum Gain Control
(Register 0x01)
Table 9. Initial Power-Up Command Register Status
REGISTER B7 B6 B5 B4 B3 B2 B1 B0 POR SETTINGS
0x00 1 0 0 01011
Shutdown mode disabled (assuming V
SHDN
= V
DD
), INL1 and
INR1 inputs selected, ATTEN = 16dB (A
V_TOTAL
= -10dB)
0x01 1 1 1 11001Beep input attenuation = 56dB, BassMax enabled, A
V_MAX
= 6dB
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

MAX9729ETI+

Mfr. #:
Buy MAX9729ETI+
Manufacturer:
Maxim Integrated
Description:
IC AMP AUDIO .052W STER 28TQFN
Lifecycle:
New from this manufacturer.
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