Instruction Manual

MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPEAKER AMPLIFIER
T
A
= +25°C ±5.5 ±23.5
Output Offset Voltage V
OS
T
MIN
≤ T
A
≤ T
MAX
±40
mV
Into shutdown -62
Out of shutdown -60
Into mute -63
Click-and-Pop Level K
CP
Peak voltage, T
A
=
+25°C, A-weighted,
32 samples per
second (Notes 3, 4)
Out of mute -62
dB
V
DD
= 2.7V to 5.5V 48 70
f = 217Hz, 100mV
P-P
ripple
68
f = 1kHz, 100mV
P-P
ripple
60
Power-Supply Rejection Ratio
(Note 3)
PSRR T
A
= +25°C
f = 20kHz, 100mV
P-P
ripple
50
dB
R
L
= 4Ω, V
DD
= 5V,
f = 1kHz
2300
R
L
= 8Ω, V
DD
= 3.3V,
f = 1kHz
600
Output Power (Note 4) P
OUT
THD+N = 1%,
T
A
= +25°C
R
L
= 8Ω, V
DD
= 5V,
f = 1kHz
1300
mW
Current Limit 1.6 A
R
L
= 8Ω,
P
OUT
= 800mW
0.03
Total Harmonic Distortion Plus
Noise (Note 4)
THD+N f = 1kHz
R
L
= 4Ω,
P
OUT
= 830mW
0.04
%
BW = 20Hz to 20kHz 81
Signal-to-Noise Ratio SNR
V
OUT
= 1.8V
RMS
,
R
L
= 8Ω (Note 3)
A-weighted 84
dB
Fixed-frequency modulation (SSM = 0) 1100
Output Frequency f
OSC
Spread-spectrum modulation (SSM = 1)
1100
±30
kHz
Efficiency η
P
OUT
= 470mW, f = 1kHz both channel
driven, L = 68µH in series with 8Ω load
80 %
Gain A
V
12 dB
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= CPV
DD
= 3.3V, GND = PGND = CPGND = 0V, SHDN = V
DD
, I
2
C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). Speaker load resistors (R
LSP
) are terminated between
OUT+ and OUT-, headphone load resistors are terminated to GND, unless otherwise noted. C1 = C2 = C3 = 1µF. T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)