Rainbow Electronics MAX9792 - Manual (Page 7)

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 7
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
MAX9791 toc07
LOAD RESISTANCE ( Ω)
OUTPUT POWER (W)
10
1.0
2.0
3.0
4.0
5.0
0
1.5
2.5
3.5
4.5
0.5
1 100
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
MAX9791 toc08
LOAD RESISTANCE ( Ω)
OUTPUT POWER (W)
10
1.0
2.0
3.0
0
1.5
2.5
0.5
1 100
f = 1kHz
THD+N = 10%
THD+N = 1%
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791 toc09
OUTPUT POWER (W)
EFFICIENCY (%)
1.0 2.0 3.0
70
80
90
100
110
20
10
30
40
50
60
0
0 4.0 0.5 1.5 2.5 3.5
R L = 8 Ω
R L = 3 Ω
f IN = 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791 toc10
OUTPUT POWER (W)
EFFICIENCY (%)
1.5 0.9 0.6
70
80
90
100
20
10
30
40
50
60
0
0 1.8 1.2 0.3
R L = 8 Ω
R L = 4 Ω
f IN = 1kHz
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9791 toc11
FREQUENCY (kHz)
PSRR (dB)
1
-30
-20
-10
-80
-90
-70
-60
-50
-40
-100
0.01 100
LEFT
RIGHT
0.1 10
0
V RIPPLE = 200mV P-P
R L = 8 Ω
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9791 toc12
FREQUENCY (kHz)
CROSSTALK (dB)
1
-30
-20
-10
-80
-90
-100
-70
-60
-50
-40
-110
0.01 100
RIGHT TO LEFT
LEFT TO RIGHT
0.1 10
0
FS = 1V RMS
V IN = -20dBFS
R
L
= 8 Ω
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 = 20k
Ω (A
VSPKR = 12dB), R IN2 = 40.2k
Ω (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.)
SPEAKER