Datasheet

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
______________________________________________________________________________________ 13
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc36
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-100
-80
-50
-40
-30
-70
-60
-20
-10
0
-110
0.01 100
R
L
= 10k
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc37
FREQUENCY (kHz)
THD+N (dBFS)
0.1 1 10
-90
-100
-80
-50
-40
-30
-70
-60
-20
-10
0
-110
0.01 100
V
HPVDD
= 3V
R
L
= 10k
Ω
V
IN
= -3dBFS
FS = 707mV
RMS
FS = 1V
RMS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc38
OUTPUT POWER (mW)
THD+N (%)
1.0 2.0 3.0
0.001
0.01
0.1
1
10
100
0.0001
04.00.5 1.5 2.5 3.5
R
L
= 10k
Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc39
OUTPUT POWER (mW)
THD+N (%)
2.01.51.0
0.001
0.01
0.1
1
10
100
0.0001
03.02.50.5
V
HPVDD
= 3V
R
L
= 10k
Ω
f = 6kHz
f = 1kHz
f = 100Hz
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9791 toc40
FREQUENCY (kHz)
CROSSTALK (dB)
0.1 1 10
-90
-80
-110
-100
-50
-40
-30
-70
-60
-20
-120
0.01 100
LEFT TO RIGHT
COM AND SENSE
R
L
= 10k
Ω
FS = 707mV
RMS
V
IN
= -20dBFS
RIGHT TO LEFT
COM AND SENSE
OUTPUT FREQUENCY SPECTRUM
(HEADPHONE MODE)
MAX9791 toc41
FREQUENCY (kHz)
OUTPUT FREQUENCY SPECTRUM (dB)
51015
-120
-100
-40
-20
0
-80
-60
-140
020
RIGHT AND LEFT
R
L
= 10k
Ω
FS = 300mV
RMS
V
IN
= -60dBFS
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. R
L
= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
LINE OUT