MAX8821 Просмотр технического описания (PDF) - Maxim Integrated
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MAX8821 Datasheet PDF : 29 Pages
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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Typical Operating Characteristics (continued)
(VIN1 = VIN2 = VIN3 = VDD = 3.6V, VAGND = VPGND1 = VPGND2 = 0V, circuit of Figure 2, TA = +25°C, unless otherwise noted.)
CLASS D AMP
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
1
VIN = 3.6V
RL = 8Ω
POUT = 25mW
TOTAL HARMONIC DISTORTION
vs. OUTPUT POWER
100
10
TOTAL HARMONIC DISTORTION
vs. OUTPUT POWER
100
10
0.1
1
1
POUT = 350mW
POUT = 100mW
0.01
0.01
0.1
1
10
100
FREQUENCY (kHz)
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
20
RL = 8Ω
0
VBATT = 5V
VOUT = -60dBV
-20
UNWEIGHTED
-40
-60
-80
-100
-120
-140
0
5
10
15
20
FREQUENCY (kHz)
AUDIO AMPLIFIER PHASE
vs. FREQUENCY
20
10
0
-10
-20
-30
-40
-50
-60
0.1
1
10
100
FREQUENCY (kHz)
0.1
0.01
0
VIN = 3.6V
RL = 8Ω
0.2 0.4 0.6 0.8 1.0
OUTPUT POWER (W)
FIXED-FREQUENCY-MODE OUTPUT
SPECTRUM vs. FREQUENCY
20
RL = 8Ω
0
VBATT = 5V
VOUT = -60dBV
-20
UNWEIGHTED
FFM -1100kHz
-40
-60
-80
-100
-120
-140
0
5
10
15
20
FREQUENCY (kHz)
AUDIO AMPLIFIER PSRR
vs. FREQUENCY
0
-10
VRIPPLE = 100mVP-P
AUDIO GAIN = 0dB
-20
RL = 4Ω
-30
-40
-50 CCMREF = 0.1μF
-60
-70
-80
-90 CCMREF = 1μF
-100
0.1
1
10
FREQUENCY (kHz)
0.1
0.01
0
VIN = 5V
RL = 4Ω
0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT POWER (W)
AUDIO AMPLIFIER GAIN
vs. FREQUENCY
12.25
12.20
12.15
12.10
12.05
12.00
11.95
11.90
11.85
11.80
11.75
0
5
10
15
20
FREQUENCY (kHz)
WIDEBAND OUTPUT SPECTRUM
SPREAD-SPECTRUM MODE
0
RL = 8Ω
-20
INPUTS AC GROUNDED
-40
-60
-80
-100
-120
-140
0.001 0.01 0.1
1
10 100
FREQUENCY (MHz)
10 ______________________________________________________________________________________
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