Datasheet

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Shutdown to Full Operation t
ON
0.4 ms
Overtemperature Threshold +150 °C
SPEAKER AMPLIFIER
R
L
= 4
(MAX9791)
1.7
R
L
= 8
(MAX9791)
1.2
THD+N = 1%,
f = 1kHz,
T
A
= +25°C
(Note 5)
R
L
= 3
(MAX9792)
3
R
L
= 4
(MAX9791)
2.2
R
L
= 8
(MAX9791)
1.5
Output Power P
OUT
THD+N = 10%,
f = 1kHz,
T
A
= +25°C
(Note 5)
R
L
= 3
(MAX9792)
3.7
W
R
L
= 8, P
OUT
= 500mW, f = 1kHz (Note 5) 0.04
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 4, P
OUT
= 500mW, f = 1kHz (Note 5) 0.03
%
V
AVDD
= V
PVDD
= 2.7V to 5.5V, T
A
= +25°C 60 80
f = 217Hz, 200mV
P-P
73
f = 1kHz, 200mV
P-P
75
Power-Supply Rejection Ratio PSRR
f = 10kHz, 200mV
P-P
62
dB
Feedback Impedance R
FSKR
Guaranteed by design 20 k
Gain A
V
R
IN1
= 20k 12 dB
Output Offset Voltage V
OS
Measured between OUT_+ and OUT_-,
T
A
= +25°C
±3 ±10 mV
Into shutdown -52.4
Click-and-Pop Level K
CP
R
L
= 8,
peak voltage,
A-weighted,
32 samples per second
(Notes 5, 6, and 7)
Out of
shutdown
-54
dBV
A-weighted 98
Signal-to-Noise Ratio SNR
R
L
= 8
P
OUT
= 1.2W f
IN
= 1kHz,
(Note 5)
20Hz to 20kHz 94
dB
Noise V
N
A-weighted 38 µV
RMS
L to R, R to L, R
L
= 8, V
IN
= -20dBFS =
100mV
RMS
, f
IN
= 1kHz (Note 5)
78
L to R, R to L, R
L
= 8, V
IN
= -20dBFS =
100mV
RMS
, f
IN
= 15kHz (Note 5)
70
Crosstalk
HP to SPKR, R
LSPKR
= 8, P
HP
= 20mW,
R
LHP
= 32, f
IN
= 1kHz (Note 5)
77
dB
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2µF (C
LDO
= 4µF for 1.8V LDO option),
C1 = C2 = 1µF. R
L
= ∞, unless otherwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF,
C
IN2
=C
COM
= 1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)