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MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
______________________________________________________________________________________________________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V, V
SHDN
= 5V, C
BIAS
= 1µF, R
IN
= R
F
= 15kΩ, R
L
= ∞. T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT AMPLIFIERS (HEADPHONE MODE, HPS = V
DD
)
V
DD
= 4.5V to 5.5V 75 106
f = 1kHz, V
RIPPLE
= 200mV
P-P
88
Power-Supply Rejection Ratio
(Note 2)
PSRR
f = 20kHz, V
RIPPLE
= 200mV
P-P
76
dB
R
L
= 32Ω 88
Output Power P
OUT
f
IN
= 1kHz, THD+N <
1%, T
A
= +25°C
R
L
= 16Ω 200
mW
P
OUT
= 60mW,
R
L
= 32Ω
0.002
Total Harmonic Distortion Plus
Noise
THD+N
f
IN
= 1kHz,
BW = 22Hz to 22kHz
P
OUT
= 125mW,
R
L
= 16Ω
0.002
%
Signal-to-Noise Ratio SNR
R
L
= 32Ω, BW = 22Hz to 22kHz,
V
OUT
= 1V
RMS
92 dB
Slew Rate SR 1.8 V/µs
Maximum Capacitive Load Drive C
L
No sustained oscillations 2 nF
Crosstalk f
IN
= 10kHz 78 dB
BIAS VOLTAGE (BIAS)
BIAS Voltage V
BIAS
2.35 2.5 2.65 V
Output Resistance R
BIAS
50 kΩ
DIGITAL INPUTS (MUTE, SHDN, HPS_EN, GAINA/B, IN11
11
/2)
Input-Voltage High V
IH
2V
Input-Voltage Low V
IL
0.8 V
Input Leakage Current I
IN
±1µA
HEADPHONE SENSE INPUT (HPS)
Input-Voltage High V
IH
0.9 x
V
DD
V
Input-Voltage Low V
IL
0.7 x
V
DD
V
Input Leakage Current I
IN
±1µA
Into shutdown -70
Click/Pop Level K
CP
Peak voltage, A-weighted,
32 samples per second
(Notes 2, 4)
Out of shutdown -52
dBV