Datasheet

Headphone Amplifier Outputs (HPL, HPR)
When operating with the on-board headphone amplifi-
er, the MAX9892 IC receives the headphone output sig-
nal from the on-board headphone amplifier. When oper-
ating with an external headphone amplifier, the
MAX9892 IC receives the external headphone amplifier
output signal connected to the HPL, HPR, and GND
PCB pads on the MAX9892 EV kit.
Jumpers JU2 and JU3 provide an option to select
between the on-board or external headphone amplifier
outputs for the MAX9892 EV kit. Table 2 lists the selec-
table jumper options for JU2 and JU3.
Mute and Shutdown Inputs (MUTE, SHDN1,
SHDN2, and SHDN)
When operating with the on-board headphone amplifi-
er, connect the MAX9892 MUTE pin to the SHDN1 and
SHDN2 pins of the on-board MAX4338 headphone
amplifier. When operating with an external headphone
amplifier, connect the MAX9892 MUTE pin to the SHDN
PCB pad on the MAX9892 EV kit. After the desired
shutdown signal is properly connected to the MAX9892
MUTE pin, use the MAX9892 MUTE pin to start up or
shut down the headphone amplifier to demonstrate the
performance of the MAX9892 IC.
Jumper JU4 selects between the on-board or external
headphone amplifier shutdown input for the MAX9892
EV kit. Jumper JU5 pulls the MAX9892 MUTE pin to
ground to initiate shutdown for the headphone amplifier
selected by jumper JU4. Table 3 lists the jumper
options for JU4 and JU5.
Evaluates: MAX9892
MAX9892 Evaluation Kit
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Table 1. JU1 Jumper Selection (VCC/VDD)
SHUNT
POSITION
POWER SUPPLY
CONNECTED TO
HEADPHONE
AMPLIFIER
1-2*
VCC PCB pad
(VCC = 2.7V to 5.5V DC)
On-board**
2-3
VDD PCB pad
(VDD = 1.7V to 5.5V DC)
External
Not installed Unconnected
MAX9892 EV kit
(not powered)
*
Default position.
**
MAX4338 limits the lower input range to 2.7V.
Table 3. JU4, JU5 Jumpers Function (MUTE)
SHUNT POSITION
JU4 JU5
MAX9892 MUTE PIN CONNECTED TO HEADPHONE AMPLIFIER OUTPUTS
Not installed* MAX4338 shutdown pins and VCC through resistor R5 Enabled (on-board)
1-2*
Installed MAX4338 shutdown pins and GND Disabled (on-board)
Not installed SHDN PCB pad and external pulled up Enabled (external)
2-3
Installed SHDN PCB pad and GND Disabled (external)
*
Default position.
Table 2. JU2, JU3 Jumpers Function
(HPL, HPR)
SHUNT
POSITION
HEADPHONE AMPLIFIER OUTPUTS
Installed* On-board headphone amplifier (MAX4338)
Not installed
External headphone amplifier (connected to
HPL, HPR, and GND PCB pads)
*
Default position.