Typical operating characteristics (continued) – Rainbow Electronics MAX9792 User Manual
Page 14
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
14
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LDO OUTPUT ACCURACY
vs. LOAD CURRENT
MAX9791 toc44
LOAD CURRENT (mA)
LDO OUTPUT ACCURACY (%)
125
75
-1.0
-1.5
0
0.5
1.0
-0.5
1.5
2.0
-2.0
0
150
25
100
50
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY LDO
MAX9791 toc48
FREQUENCY (kHz)
PSRR (dB)
10
1
0.1
-80
-60
-40
-20
0
20
40
-100
0.01
100
LDO_OUT = 4.74V
LDO_OUT = 3.3V
V
RIPPLE
= 200mV
P-P
I
LOAD
= 10mA
0
100
50
200
150
250
300
0
100
150
50
200
250
300
LDO DROPOUT VOLTAGE vs. LOAD
MAX9791 toc47
I
LOAD
(mA)
LDO DROPOUT VOLTAGE (mV)
LDO_OUT = 4.75V
LDO OUTPUT NOISE
MAX9791 toc49
FREQUENCY (kHz)
LDO OUTPUT NOISE (
μ
V)
10
1
0.1
75
100
125
150
175
200
50
0.01
100
C
LOAD
= 2 x 1
μF
I
LOAD
= 120mA
LDO OUTPUT ACCURACY
vs. TEMPERATURE
MAX9791 toc46
TEMPERATURE (
°C)
LDO OUTPUT ACCURACY (%)
60
35
10
-15
-0.5
0
0.5
1.0
-1.0
-40
85
LDO_OUT = 3.3V
LDO_OUT = 4.75V
LDO OUTPUT ACCURACY
vs. AMPLIFIER OUTPUT POWER
MAX9791 toc45
AMPLIFIER OUTPUT POWER (mW)
LDO OUTPUT ACCURACY (%)
300
0.04
0.03
0.02
0.01
0.06
0.07
0.08
0.05
0.09
0.10
0
0
1500
1200
600
900
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.)
LDO