Owner's manual

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SPEAKER AMPLIFIER
R
L
= 4Ω
(MAX9791)
1.7
R
L
= 8Ω
(MAX9791)
1.2
THD+N = 1%,
f = 1kHz,
T
A
= +25°C
(Note 4)
R
L
= 3Ω
(MAX9792)
3
R
L
= 4Ω
(MAX9791)
2.2
R
L
= 8Ω
(MAX9791)
1.5
Output Power P
OUT
THD+N = 10%,
f = 1kHz,
T
A
= +25°C
(Note 4)
R
L
= 3Ω
(MAX9792)
3.7
W
R
L
= 8Ω, P
OUT
= 500mW, f = 1kHz (Note 4) 0.04
Total Harmonic Distortion Plus
Noise
THD+N
R
L
= 4Ω, P
OUT
= 500mW, f = 1kHz (Note 4) 0.03
%
V
AVDD
= V
PVDD
= 4.5V to 5.5V, T
A
= +25°C60 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 kΩ
Gain A
V
R
IN1
= 20kΩ 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
= 8Ω,
peak voltage,
A-weighted,
32 samples per second
(Notes 4, 5, and 6)
Out of
shutdown
-54
dBV
A-weighted 98
Signal-to-Noise Ratio SNR
R
L
= 8Ω
P
OUT
= 1.2W f
IN
= 1kHz,
(Note 4)
20Hz to 20kHz 94
dB
Noise V
N
A-weighted 38 µV
RMS
L to R, R to L, R
L
= 8Ω, V
I N
= - 20d BFS =
100m V
R M S
, f
I N
= 1kH z ( N ote 4)
78
L to R, R to L, R
L
= 8Ω, V
I N
= - 20d BFS =
100m V
R M S
, f
I N
= 15kH z ( N ote 4)
70
Crosstalk
HP to SPKR, R
LSPKR
= 8Ω, P
HP
= 20mW,
R
LHP
= 32Ω, f
IN
= 1kHz (Note 4)
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, C1 = C2 = 1µF. R
L
= ∞, unless other-
wise 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)