Datasheet

6 ______________________________________________________________________________________
MAX98502
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Typical Operating Characteristics (continued)
(V
BAT
= 3.6V, R
L
= ∞ between SPKP and SPKN, A
V
= +15.5dB, RKNEE = V
BAT
, 20Hz to 22kHz AC measurement bandwidth, unless
otherwise noted.)
Speaker
THD+N vs. FREQUENCY
MAX98502 toc07
FREQUENCY (kHz)
THD+N (%)
1010.1
0.01
0.1
1
10
0.001
0.01 100
P
OUT
= 1.4W
Z
LOAD
= 8I + 68µH
P
OUT
= 400W
THD+N vs. OUTPUT POWER
MAX98502 toc10
OUTPUT POWER (W)
THD+N (%)
4.03.53.02.52.01.51.00.5
0.01
0.1
1
10
100
0.001
0 4.5
Z
LOAD
= 4I + 33µH
C
VCCOUT
= 22µF (0804)
f = 6kHz
f = 1kHz
f = 100kHz
FREQUENCY (kHz)
1
100
PSRR (dB)
100.10.01
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX98502 toc15
-100
-80
-60
-40
-20
0
-120
V
RIPPLE
= 200mV
P-P
INPUTS AC-COUPLED AGND
THD+N vs. FREQUENCY
MAX98502 toc08
FREQUENCY (kHz)
THD+N (%)
1010.1
0.01
0.1
1
10
0.001
0.01 100
P
OUT
= 2.5W
Z
LOAD
= 4I + 33µH
C
VCCOUT
= 22µF (0804)
P
OUT
= 500W
OUTPUT POWER vs. LOAD RESISTANCE
MAX98502 toc11
LOAD RESISTANCE (I)
OUTPUT POWER (W)
10010
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
11
k
THD+N = 10%
THD+N = 1%
f
IN
= 1kHz
Z
SPRK
= LOAD + 68µF
THD+N vs. OUTPUT POWER
MAX98502 toc09
OUTPUT POWER (W)
THD+N (%)
2.01.61.20.80.4
0.01
0.1
1
10
100
0.001
0 2.4
Z
LOAD
= 8I + 68µH
f = 6kHz
f = 1kHz
f = 100kHz
OUTPUT POWER vs. BATTERY VOLTAGE
MAX98502 toc12
V
BAT
(V)
OUTPUT POWER (W)
5.04.54.03.53.0
0.5
1.0
1.5
2.0
2.5
3.0
0
2.5 5.5
THD+N = 10%
THD+N = 1%
f
IN
= 1kHz
Z
SPRK
= 8I + 68µF
OUTPUT POWER vs. BATTERY VOLTAGE
MAX98502 toc13
V
BAT
(V)
OUTPUT POWER (W)
5.04.54.03.53.0
1
2
3
4
5
0
2.5 5.5
THD+N = 10%
THD+N = 1%
f
IN
= 1kHz
Z
SPRK
= 4I + 33µF
GAIN vs. FREQUENCY
MAX98502 toc14
FREQUENCY (kHz)
GAIN (dB)
1001010.1
-30
-20
-10
0
10
20
30
-40
0.01 1000
A
V
= 6dB
A
V
= 15.5dB
A
V
= 20dB
Z
LOAD
= 8I + 68µH