Datasheet

MAX98357A/MAX98357B
PCM Input Class D Audio Power Amplifiers
5Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V, V
GND
= 0V, GAIN_SLOT = V
DD
. BCLK = 3.072MHz, LRCLK = 48kHz, speaker loads (Z
SPK
) connected between OUTP
and OUTN, Z
SPK
= J, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Power (Note 3) P
OUT
THD+N 10%,
gain = 12dB
Z
SPK
= 4I + 33FH
3.2
W
Z
SPK
= 8I + 68FH
1.8
Z
SPK
= 8I + 68FH,
V
DD
= 3.7V
0.93
THD+N = 1%,
gain = 12dB
Z
SPK
= 4I + 33FH
2.5
Z
SPK
= 8I + 68FH
1.4
Z
SPK
= 8I + 68FH,
V
DD
= 3.7V
0.77
Total Harmonic Distortion +
Noise
THD+N
f = 1kHz, P
OUT
= 1W, T
A
= +25NC,
Z
SPK
= 4I + 33FH, WLP
0.02 0.06
%
f = 1kHz, P
OUT
= 1W, T
A
= +25NC,
Z
SPK
= 4I + 33FH, TQFN
0.02
f = 1kHz, P
OUT
= 0.5W, T
A
= +25NC,
Z
SPK
= 8I + 68FH
0.013
Dynamic Range DR
A-weighted,
V
RMS
= 2.54V, 24- or 32-bit data
105 dB
Output Noise V
N
A-weighted, 24- or 32-bit data (Note 4) 25
FV
RMS
Gain (Relative to a 2.1dBV
Reference Level)
A
V
GAIN_SLOT = GND through 100kI
14.4 15 15.6
dB
GAIN_SLOT = GND 11.4 12 12.6
GAIN_SLOT = unconnected 8.4 9 9.6
GAIN_SLOT = V
DD
5.4 6 6.6
GAIN_SLOT = V
DD
through 100kI
2.4 3 3.6
Current Limit I
LIM
2.8 A
Efficiency
ε
Z
SPK
= 8I + 68FH, THD+N = 10%,
f = 1kHz, gain = 12dB
92 %
DAC Gain Error 1 %
Frequency Response -0.2 +0.2 dB
Class D Switching Frequency f
OSC
330 kHz
Spread-Spectrum Bandwidth
Q20
kHz
DAC DIGITAL FILTERS
VOICE MODE IIR LOWPASS FILTER (LRCLK < 30kHz)
Passband Cutoff f
PLP
Ripple limit cutoff
0.443
x f
S
Hz
-3dB cutoff
0.446
x f
S
Stopband Cutoff f
SLP
0.464
x f
S
Hz
Stopband Attenuation f > f
SLP
75 dB