Datasheet

MAX98355A/MAX98355B
PCM Input Class D Audio Power Amplifiers
13Maxim Integrated
Typical Operating Characteristics (continued)
(V
DD
= 5V, V
G
ND
= 0V, GAIN = V
DD
(+6dB). BCLK = 3.072MHz, LRCLK = 48kHz, speaker loads (Z
SPK
) connected between OUTP
and OUTN, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25NC.)
POWER-SUPPLY REJECTION RATIO
vs. SUPPLY VOLTAGE
MAX98355A-B toc27
SUPPLY VOLTAGE (V)
PSRR (dB)
5.04.54.03.53.0
10
20
30
40
50
60
70
80
90
100
0
2.5 5.5
f = 1kHz
Z
SPK
= 8I + 68µH
EFFICIENCY vs. OUTPUT POWER
MAX98355A/B toc24
EFFICIENCY (%)
10
20
30
40
50
60
70
80
90
100
0
V
DD
= 3.7V
GAIN = 12dB
Z
SPK
= 4I + 33µH
OUTPUT POWER PER CHANNEL (W)
1.6 1.81.2 1.40.2 0.4 0.6 0.8 1.00
10k1k10010 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX98355A-B toc28
FREQUENCY (Hz)
PSRR (dB)
10
20
30
40
50
60
70
80
90
100
0
V
DD
= 5V
Z
SPK
= 8I + 68µH
OUTPUT POWER PER CHANNEL (W)
2.01.51.00.5
EFFICIENCY vs. OUTPUT POWER
MAX98355A/B toc25
EFFICIENCY (%)
10
20
30
40
50
60
70
80
90
100
0
0 2.5
V
DD
= 4.2V
GAIN = 12dB
Z
SPK
= 4I + 33µH
INBAND OUTPUT SPECTRUM
MAX98355A/B toc29
FREQUENCY (kHz)
AMPLITUDE (dBV)
18162 4 6 10 128 14
-120
-100
-80
-60
-40
-20
0
20
-140
02
0
BCLK = 6.144MHz
LRCLK = 96kHz
Z
SPK
= 8I + 68µH
EFFICIENCY vs. OUTPUT POWER
MAX98355A/B toc26
OUTPUT POWER PER CHANNEL (W)
EFFICIENCY (%)
3.02.0 2.51.0 1.50.5
10
20
30
40
50
60
70
80
90
100
0
0 3.5
V
DD
= 5V
GAIN = 12dB
Z
SPK
= 4I + 33µH