Datasheet

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
10 ______________________________________________________________________________________
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc17
FREQUENCY (kHz)
THD+N (dBFS)
1
-80
-90
-70
-60
-100
0.01 100
FS = 300mV
RMS
FS = 1V
RMS
0.1 10
-50
R
L
= 16
Ω
V
IN
= -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc18
FREQUENCY (kHz)
THD+N (dBFS)
1
-80
-90
-70
-60
-100
0.01 100
FS = 300mV
RMS
FS = 1V
RMS
0.1 10
-50
V
HPVDD
= 3V
R
L
= 16
Ω
V
IN
= -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc19
FREQUENCY (kHz)
THD+N (dBFS)
1
-80
-90
-70
-60
-100
0.01 100
FS = 300mV
RMS
FS = 1V
RMS
0.1 10
-50
R
L
= 32
Ω
V
IN
= -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc20
FREQUENCY (kHz)
THD+N (dBFS)
1
-80
-90
-70
-60
-100
0.01 100
FS = 300mV
RMS
FS = 1V
RMS
0.1 10
-50
V
HPVDD
= 3V
R
L
= 32
Ω
V
IN
= -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc21
OUTPUT POWER (mW)
THD+N (%)
160
0.1
0.01
1
10
0.001
0 200
f = 6kHz
f = 1kHz
f = 100Hz
12040 80
100
R
L
= 16
Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc22
OUTPUT POWER (mW)
THD+N (%)
0.1
0.01
1
10
0.001
050 250
f = 6kHz
f = 1kHz
f = 100Hz
200
150
100
100
R
L
= 32
Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc23
OUTPUT POWER (mW)
THD+N (%)
10
0.1
0.01
1
10
0.001
05040 90
f = 6kHz
f = 1kHz
f = 100Hz
80
70
603020
100
V
HPVDD
= 3V
R
L
= 16
Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc24A
OUTPUT POWER (mW)
THD+N (%)
10
0.1
0.01
1
10
0.001
05040 70
f = 6kHz
f = 1kHz
f = 100Hz
603020
100
V
HPVDD
= 3V
R
L
= 32
Ω
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9791 toc25
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10
50
150
250
0
100
200
1100
f = 1kHz
THD+N = 10%
THD+N = 1%
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.)
HEADPHONE