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).

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 8Ω

speakers in stereo mode, or 1 x 12W into a 4Ω speaker

in mono mode. Refer to the MAX9736A/MAX9736B IC

data sheet for additional information.

MAX9736A Evaluation Kit

4

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Table 4. JU3 Jumper Selection (REGEN)

SHUNT

POSITION

REGEN PIN

CONNECTED TO

EV KIT INTERNAL

REGULATOR

Installed*

DVDD

Enabled

Not

installed

PGND

(through resistor R15)

Disabled

*

Default position.

Table 5. JU4 Jumper Selection (

MUTE)

SHUNT

POSITION

MUTE PIN

CONNECTED TO

AUDIO OUTPUT

Installed*

DVDD

Normal operation

Not

installed

PGND

(through resistor R16)

Muted

*

Default position.

Table 6. JU5 Jumper Selection (MOD)

SHUNT POSITION

MOD PIN CONNECTED TO

OUTPUT MODULATION SCHEME

Installed*

DVDD

Filterless modulation

Not installed

PGND (through resistor R17)

Classic pulse-width modulation (PWM)

*

Default position.

Table 7. JU6 Jumper Selection (MONO)

SHUNT POSITION

MONO PIN CONNECTED

TO

OUTPUT SPEAKER MODE

AUDIO INPUT SOURCE CONNECTED TO

Not installed*

PGND

(through resistor R18)

Stereo mode

LIN and RIN

Install a shorting wire

DVDD

Mono mode

LIN

(RIN is an uncommitted inverting op amp)

*

Default position.