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MAX98304EVKIT+ Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX98304EVKIT+ Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 6 page MAX98304 Evaluation Kit _______________________________________________________________________________________ 3 *Default position. *Default position. Table 2. Shutdown (JU2) Table 3. Gain Setting (JU3) Shutdown JU2 enables or disables the audio speaker amplifier. See Table 2 for JU2 configuration. Gain Setting The EV kit maximum signal gain can be configured to five different settings. JU3 selects the overall gain for the EV kit. See Table 3 for JU3 configuration. Filtered Output Audio analyzers typically cannot accept pulse-width- modulated (PWM) signals at their inputs. Therefore, the EV kit features the option to install a lowpass filter at its outputs to ease evaluation. OUT+ and OUT- are shorted to FOUT+ and FOUT-. The trace must be broken at L1 and L2 before installing inductors L1 and L2 (provided with the EV kit). The filter components (C7–C11, R3, and R4) are provided with the EV kit and must be installed prior to operation. Use FOUT+ and FOUT- to connect the filtered PWM outputs to an audio analyzer. The default lowpass filter at the EV kit outputs is optimized for an 8I speaker. Contact the factory for the 4I speaker filter. The IC can pass CE EN55022B regulations with 60cm of speaker cable and no filtering. However, ferrite-bead filters can be used to achieve further attenuation of radi- ated emissions. To install the ferrite-bead filters, replace shorting resistors FB1 and FB2 with 0603 or smaller ferrite beads and install filter capacitors on the C5 and C6 pads. The speaker wire should be connected to the FOUT+ and FOUT- pads. Filterless Output The EV kit’s filterless outputs (OUT+ and OUT-) can be connected directly to a speaker load without any filtering. Use the OUT+ and OUT- test points or the FOUT+ and FOUT- pads to connect a speaker directly to the IC out- puts. Inductors L1 and L2 are not installed for maximum efficiency. SHUNT POSITION SHDN PIN AMPLIFIER 1-2* Connected to PVDD Enabled 2-3 Connected to PGND Disabled SHUNT POSITION GAIN PIN MAXIMUM GAIN (dB) Open Not connected 0 1-2 Connected to PVDD through R1 +3 1-3 Connected to PVDD +6 1-4 Connected to PGND through R2 +9 1-5* Connected to PGND +12 |
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