max98088 Maxim Integrated Products, Inc., max98088 Datasheet - Page 96
max98088
Manufacturer Part Number
max98088
Description
Stereo Audio Codec With Flexsound Technology
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX98088.pdf
(123 pages)
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Stereo Audio Codec
with FLEXSOUND Technology
The IC integrates a stereo filterless Class D amplifier that
offers much higher efficiency than Class AB without the
typical disadvantages.
The high efficiency of a Class D amplifier is due to the
switching operation of the output stage transistors. In a
Class D amplifier, the output transistors act as current
steering switches and consume negligible additional
power. Any power loss associated with the Class D out-
put stage is mostly due to the I
on-resistance, and quiescent current overhead.
Figure 26. Speaker Amplifier Path Block Diagram
96
DALEN
DAREN
DACL
DACR
Speaker Amplifiers
2
R loss of the MOSFET
MIXSPL
MIXSPR
MIX
MIX
SPVOLL:
+8dB TO -62dB
SPVOLR:
+8dB TO -62dB
The theoretical best efficiency of a linear amplifier is
78%, however, that efficiency is only exhibited at peak
output power. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the IC’s Class D amplifier still exhibits 80% effi-
ciency under the same conditions.
Traditional Class D amplifiers require the use of exter-
nal LC filters or shielding to meet EN55022B and FCC
electromagnetic-interference (EMI) regulation standards.
Maxim’s patented active emissions limiting edge-rate
control circuitry reduces EMI emissions.
+6dB
+6dB
SPLEN
SPREN
DISTORTION LIMITER
POWER/
SPKRGND
SPKLVDD
SPKLGND
SPKRVDD
SPKRN
SPKLP
SPKLN
SPKRP
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