User guide

MAX9750/MAX9751/MAX9755
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= CPV
DD
= HPV
DD
= 5V, GND = PGND = CPGND = 0V, SHDN = V
DD
, C
BIAS
= 1µF, C1 = C2 = 1µF, speaker load
terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND, GAIN1 = GAIN2 = VOL = GAIN = 0V,
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
HEADPHONE AMPLIFIER (HPS = V
DD
)
Output Offset Voltage V
OS
T
A
= +25°C ±2 ±7mV
HPV
DD
= 3V to 5.5V, T
A
= +25°C 60 75
f = 1kHz, V
RIPPLE
= 200mV
P-P
73
Power-Supply Rejection Ratio
(Note 3)
PSRR
f = 10kHz, V
RIPPLE
= 200mV
P-P
63
dB
R
L
= 32Ω 40 50
Output Power P
OUT
THD+N = 1%,
f = 1kHz, T
A
= +25°C
R
L
= 16Ω
110
mW
R
L
= 32Ω, P
OUT
= 20mW, f = 1kHz
0.007
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 16Ω, P
OUT
= 75mW, f = 1kHz
0.03
%
Signal-to-Noise Ratio SNR
R
L
= 32Ω, P
OUT
= 50mW, BW = 22Hz to
22kHz
95 dB
Noise V
n
BW = 22Hz to 22kHz 12
µV
RMS
Capacitive-Load Drive C
L
No sustained oscillations
200
pF
Crosstalk L to R, R to L, f = 10kHz 88
Off-Isolation
Any unselected input to any active input,
f = 10kHz (MAX9751), input referred
74
dB
Slew Rate SR 0.4 V/µs
ESD ESD IEC air discharge ±8 kV
GAIN2 = GAIN = 0, GAIN1 = X 0
Gain A
V
GAIN2 = GAIN = 1, GAIN1 = X 3
dB
CHARGE PUMP
Charge-Pump Frequency f
OSC
500 550
600 kHz
VOLUME CONTROL (MAX9750_)
VOL Input Impedance R
VOL
100
MΩ
VOL Input Hysteresis 10 mV
Full Mute Input Voltage (Note 5)
0.858 x
HPV
DD
V
Channel Matching A
V
= -25dB to +13.5dB
±0.2
dB
BEEP INPUT (MAX9750_)
Beep Signal Minimum Amplitude
V
BEEP
R
B
= 33kΩ (Note 6) 0.8 V
P-P
Beep Signal Minimum Frequency
f
BEEP
400
Hz