max98089 Maxim Integrated Products, Inc., max98089 Datasheet - Page 100
![no-image](/images/no-image-200.jpg)
max98089
Manufacturer Part Number
max98089
Description
Low-power, Stereo Audio Codec With Flexsound Technology
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX98089.pdf
(131 pages)
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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
��������������������������������������������������������������� Maxim Integrated Products 100
DALEN
DAREN
DACL
DACR
Speaker Amplifiers
2
R loss of the MOSFET
MIXSPR
MIXSPL
MIX
MIX
Low-Power, Stereo Audio Codec
SPVOLL:
+8dB TO -62dB
SPVOLR:
+8dB TO -62dB
with FlexSound Technology
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% efficiency
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, allowing opera-
tion without any output filtering in typical applications.
+6dB
+6dB
SPLEN
SPREN
DISTORTION LIMITER
POWER/
SPKRGND
SPKLGND
SPKRVDD
SPKLVDD
SPKRN
SPKLN
SPKRP
SPKLP
MAX98089
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