MAX9879EVKIT+ Maxim Integrated, MAX9879EVKIT+ Datasheet - Page 8

• Manufacturer Part Number: MAX9879EVKIT+
• Description: Audio Amplifiers Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
• Manufacturer: Maxim Integrated

Specifications of MAX9879EVKIT+

• Product: Class-D
• Output Power: 58 mW, 715 mW
• Thd Plus Noise: 0.04 %
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Power Dissipation: 1250 mW
• Common Mode Rejection Ratio (min): 43 dB
• Input Signal Type: Differential, Single
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

MAX9879 Evaluation Kit
Audio analyzers typically cannot accept pulse-width-
modulated (PWM) signals at their inputs. Therefore, the
MAX9879 EV kit features two pair of lowpass filters at
the output to ease evaluation. To use the filtering output
pads (FOUT_+ and FOUT_-), install the inductors
(L1–L4) provided separately with the EV kit. Then con-
nect the load between FOUT_+ and FOUT_-. Lastly,
connect the filtered output to the audio analyzer. The
default lowpass filters at the EV kit output are optimized
for an 8Ω speaker.
Figure 3. Example of a Simple SMBusWriteByte Operation Using the Advanced User Interface
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Filtered Output
• To ease evaluation, the MAX9879 EV kits are
• The ferrite-bead filter component selections are
• To install the ferrite-bead filters, first cut open the
shipped with inductor-based output filters, with
inductors L1–L4 provided separately with the EV kit.
However, ferrite-bead filters (FB6, FB7, FB11, FB12,
C32, C33, C48, and C49) should be used when EMC
testing.
dependent on speaker-wire length, and are deter-
mined during EMC testing.
PCB traces between FB6, FB7, FB11, and FB12.
Then install the ferrite-bead filtering components
(FB6, FB7, C32, C33, C48, and C49). The speaker
wires should be connected to the OUT_+ and OUT_-
test points using twisted-pair cables.
Output Filtering Requirements