Datasheet

MAX98500 Evaluation Kit
Evaluates: MAX98500
_______________________________________________________________________________________ 3
*Default position.
*Default position.
*Default position.
Selectable Gain Setting
The MAX98500 features three internal gain settings that
are selectable with the GAIN input. Jumper JU1 controls
the amplifier’s gain select input. See Table 1 for jumper
JU1 configuration.
Shutdown Inputs
The MAX98500 features two active-low shutdown inputs
(SDSPK and SDBST). Jumper JU2 enables or disables
the speaker amplifier (SDSPK) and jumper JU3 controls
the boost converter (SDBST). See Table 2 for jumpers
JU2 and JU3 configuration. Note that the boost must be
enabled for the speaker amplifier to enable.
Input Mode
Jumper JU4 provides the option to select between a dif-
ferential or single-ended input mode for the EV kit. See
Table 3 for JU4 configuration.
Optional Output Filtering
The MAX98500 speaker amplifier is designed to pass
FCC emissions standards without any filtering. When
evaluating the MAX98500 without any filtering, connect
the speaker to the output test points (OUT+, OUT-).
The EV kit also features PCB pads for a lowpass filter
that can be added to ease evaluation. Audio analyzers
typically cannot accept the Class D amplifier’s pulse-
width-modulated (PWM) waveform at their inputs. The
lowpass filter extracts the audio content from the PWM
output signal and allows the device to be connected
directly to an audio analyzer. The PWM output signal
can be lowpass-filtered by simply installing L2 and L3;
all other components are populated. The filtered outputs
should then be monitored at the FOUT+/FOUT- pads.
See Table 4 for suggested filtering components for an
8I load.
Table 1. Gain Input (JU1) Table 3. Input Mode (JU4)
Table 2. Shutdown Configuration
(JU2, JU3)
Table 4. Suggested Filtering Components
for 8I Load
SHUNT
POSITION
GAIN PIN
GAIN SETTING
(dB)
2-3 Connected to AGND 6
Not installed* Unconnected 15.5
1-2 Connected to VBAT 20
SHUNT
POSITION
IN- PIN INPUT MODE
Installed* Connected to AGND
Single-ended/
unbalanced input
Not installed
Connected to user-
supplied negative
differential output
Differential input
SDSPK PIN
(JU2)
SDBST PIN
(JU3)
BOOST
STATUS
SPEAKER
STATUS
2-3 (low) 2-3 (low) Off Off
1-2 (high) 2-3 (high) Off Off
2-3 (low) 1-2 (low) On Off
1-2* (high) 1-2* (high) On On
DESIGNATION QTY DESCRIPTION
L2, L3 2
22FH Q20%, 0.7A inductor
(D63CB)
TOKO A916CY-220M