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MAX9736A Evaluation Kit
Internal Regulator Enable (REGEN)
The MAX9736A provides an option to disable the internal
regulator when an optional external power supply is con-
nected to the VS and AGND pads on the EV kit to power
the MAX9736A preamplifiers. Jumper JU3 controls the
internal regulator enable (REGEN) pin on the MAX9736A
IC (see Table 4 for shunt positions). See the Optional
External Preamplifier Power Supply (VS) section.
Mute Function ( MUTE )
The MAX9736A features a mute function to mute the
audio output of the EV kit. Jumper JU4 controls the
mute ( MUTE ) pin of the MAX9736A IC (see Table 5 for
shunt positions).
Modulation Scheme (MOD)
The MAX9736A EV kit provides an option to select the
modulation scheme for the MAX9736A output. Jumper
JU5 controls the modulation-scheme pin (MOD) of the
MAX9736A IC (see Table 6 for shunt positions).
Table 4. JU3 Jumper Selection (REGEN)
Mono Mode (MONO)
The MAX9736A EV kit is preconfigured to stereo mode
from the factory. To change the MAX9736A EV kit to
operate in mono mode, short jumper JU6 with a short-
ing wire, connect the FOUTL- to the FOUTR- with a
short banana-lead cable, connect the FOUTL+ to the
FOUTR+ with a short banana-lead cable. Connect the
audio input source to the LIN RCA jack. In mono mode,
the right input (RIN) becomes an uncommitted inverting
op amp that can be used for filtering. Jumper JU6 con-
trols the mono mode for the MAX9736A IC (see Table 7
for shunt positions).
Evaluating the MAX9736B
The MAX9736A EV kit can also evaluate the
MAX9736B. Remove the MAX9736A IC (U1) and
replace it with the MAX9736B IC. The MAX9736B IC is
pin compatible with the MAX9736A IC. The MAX9736B
Class D amplifier can drive 2 x 6W into a pair of 8 Ω
speakers in stereo mode, or 1 x 12W into a 4 Ω speaker
in mono mode. Refer to the MAX9736A/MAX9736B IC
data sheet for additional information.
Table 5. JU4 Jumper Selection ( MUTE )
SHUNT
POSITION
Installed*
Not
installed
REGEN PIN
CONNECTED TO
DVDD
PGND
(through resistor R15)
EV KIT INTERNAL
REGULATOR
Enabled
Disabled
SHUNT
POSITION
Installed*
Not
installed
MUTE PIN
CONNECTED TO
DVDD
PGND
(through resistor R16)
AUDIO OUTPUT
Normal operation
Muted
*Default position.
Table 6. JU5 Jumper Selection (MOD)
*Default position.
SHUNT POSITION
Installed*
Not installed
MOD PIN CONNECTED TO
DVDD
PGND (through resistor R17)
OUTPUT MODULATION SCHEME
Filterless modulation
Classic pulse-width modulation (PWM)
*Default position.
Table 7. JU6 Jumper Selection (MONO)
SHUNT POSITION
Not installed*
Install a shorting wire
MONO PIN CONNECTED
TO
PGND
(through resistor R18)
DVDD
OUTPUT SPEAKER MODE
Stereo mode
Mono mode
AUDIO INPUT SOURCE CONNECTED TO
LIN and RIN
LIN
(RIN is an uncommitted inverting op amp)
*Default position.
4
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