Rainbow Electronics MAX9792 - Manual (Page 10)

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
10 ______________________________________________________________________________________
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9791 toc26
LOAD RESISTANCE ( Ω)
OUTPUT POWER (mW)
100
50
70
90
0
60
80
10
30
20
40
10 1000
V HPVDD = 3V
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9791 toc27
PER CHANNEL OUTPUT POWER (mW)
POWER DISSIPATION PER CHANNEL (mW)
50 100 150
200
250
300
50
100
150
350
400
0
0 200 25 75 125 175
R L = 32 Ω
R L = 16 Ω
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9791 toc28
PER CHANNEL OUTPUT POWER (mW)
POWER DISSIPATION PER CHANNEL (mW)
20
100
150
200
50
250
300
0
0 100 80 40 60
R L = 32 Ω
V HPVDD = 3V
R L = 16 Ω
HEADPHONE OUTPUT POWER
vs. HPVDD VOLTAGE
MAX9791 toc29
V HPVDD (V)
HEADPHONE OUTPUT POWER (mW)
3.5
100
150
200
50
250
0
3.0 5.5 5.0 4.0 4.5
R L = 32 Ω
THD+N = 1%
f = 1kHz
R L = 16 Ω
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc30
FREQUENCY (kHz)
PSRR (dB)
0.1 1 10
-90
-80
-110
-100
-50
-40
-30
-70
-60
-20
-10
0
-120
0.01 100
V RIPPLE = 200mV P-P
R L = 32 Ω
LEFT
RIGHT
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9791 toc31
FREQUENCY (kHz)
CROSSTALK (dB)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-100
0.01 100
RIGHT TO LEFT
COM AND SENSE
DISABLED
RIGHT TO LEFT
COM AND SENSE
DISABLED
LEFT TO RIGHT
COM AND SENSE
R L = 32 Ω
FS = 300mV
RMS
V IN = -20dBFS
RIGHT TO LEFT
COM AND SENSE
OUTPUT FREQUENCY SPECTRUM
(HEADPHONE MODE)
MAX9791 toc32
FREQUENCY (kHz)
OUTPUT FREQUENCY SPECTRUM (dB)
5 10 15
-120
-100
-40
-20
0
-80
-60
-140
0 20
RIGHT AND LEFT
FS = 707mV
RMS
V IN = -60dBFS
R L = 32 Ω
MAX9791 toc33
HP_EN
2V/div
HP_
500mV/div
200 μs/div
STARTUP WAVEFORM
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.)
HEADPHONE