MAX8821 MAXIM [Maxim Integrated Products], MAX8821 Datasheet - Page 10

• Manufacturer Part Number: MAX8821
• Description: White LED Charge Pump with Mono Class D Audio Amp and Dual LDO
• Manufacturer: MAXIM [Maxim Integrated Products]

White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
(V
10
IN1
0.01
-100
-120
-140
-10
-20
-30
-40
-50
-60
-20
-40
-60
-80
0.1
20
10
20
______________________________________________________________________________________
1
0
= V
0
0.01
0.1
0
SPREAD-SPECTRUM-MODE OUTPUT
IN2
V
R
TOTAL HARMONIC DISTORTION
IN
L
= 8Ω
PLUS NOISE vs. FREQUENCY
= 3.6V
= V
SPECTRUM vs. FREQUENCY
AUDIO AMPLIFIER PHASE
0.1
5
IN3
vs. FREQUENCY
FREQUENCY (kHz)
FREQUENCY (kHz)
1
FREQUENCY (kHz)
= V
P
OUT
DD
10
1
= 100mW
= 3.6V, V
P
OUT
10
R
V
V
UNWEIGHTED
P
L
BATT
OUT
OUT
= 350mW
= 8Ω
10
15
= 25mW
= -60dBV
= 5V
AGND
100
100
20
= V
PGND1
-100
-120
-140
-100
0.01
100
-20
-40
-60
-80
-10
-20
-30
-40
-50
-60
-70
-80
-90
Typical Operating Characteristics (continued)
0.1
20
10
0
1
0
0.1
0
0
= V
FIXED-FREQUENCY-MODE OUTPUT
C
C
CMREF
CMREF
TOTAL HARMONIC DISTORTION
PGND2
SPECTRUM vs. FREQUENCY
0.2
AUDIO AMPLIFIER PSRR
CLASS D AMP
= 0.1μF
= 1μF
5
vs. OUTPUT POWER
OUTPUT POWER (W)
vs. FREQUENCY
FREQUENCY (kHz)
FREQUENCY (kHz)
= 0V, circuit of Figure 2, T
0.4
10
1
V
AUDIO GAIN = 0dB
R
0.6
RIPPLE
L
= 4Ω
R
V
V
UNWEIGHTED
FFM -1100kHz
L
BATT
OUT
= 8Ω
15
= 100mV
V
R
= -60dBV
0.8
= 5V
IN
L
= 8Ω
= 3.6V
P-P
1.0
20
10
A
= +25°C, unless otherwise noted.)
12.25
12.20
12.15
12.10
12.05
12.00
11.95
11.90
11.85
11.80
11.75
-100
-120
-140
0.01
100
-20
-40
-60
-80
0.1
10
1
0
0.001
0
0
WIDEBAND OUTPUT SPECTRUM
TOTAL HARMONIC DISTORTION
0.5
SPREAD-SPECTRUM MODE
0.01
AUDIO AMPLIFIER GAIN
5
vs. OUTPUT POWER
OUTPUT POWER (W)
1.0
vs. FREQUENCY
FREQUENCY (MHz)
FREQUENCY (kHz)
0.1
1.5
10
R
INPUTS AC GROUNDED
L
= 8Ω
1
2.0
15
10
V
R
2.5
IN
L
= 4Ω
= 5V
100
3.0
20