Datasheet

Evaluates: MAX4410
MAX4410 Evaluation Kit
2 _______________________________________________________________________________________
Quick Start
Recommended Equipment
One pair of 16 or 32 headphones
One variable DC power supply capable of supplying
between 1.8V and 3.6V at 300mA
One stereo audio source
Procedure
The MAX4410 EV kit is fully assembled and tested. Follow
the steps below to verify board operation. Do not turn on
the power supply until all connections are completed:
1) Plug the headphones into the 3.5mm headphone
jack.
2) Ensure that the stereo audio source is turned off.
3) Connect the disabled stereo audio source through
the RCA phono jacks.
4) Ensure that shunts JU1 and JU2 are installed in posi-
tion 1-2.
5) Connect the 1.8V to 3.6V DC power supply to the
VCC and GND pads.
6) Turn on the DC power supply.
7) Enable the stereo audio source.
Detailed Description
The MAX4410 EV kit is a stereo, single-supply head-
phone amplifier. The MAX4410 EV kit is designed to be
driven by the stereo lineout of a CD player or directly
connected to any stereo audio source. The input
impedance is 10k. The -3dB corner frequencies are
approximately 16Hz and 159kHz and are dependent on
components R1R4 and C1C4. The MAX4410 EV kit
has a gain of -1 and can be powered with a 1.8V to
3.6V supply.
Shutdown Control
The MAX4410 EV kit provides two shutdown pins
(
SHDNL, SHDNR) to disable the outputs. Jumpers JU1
and JU2 control the left and right channels, respectively
(see Table 1 for shutdown shunt positions).
Shorting pin 2 of JU1 to pin 2 of JU2 allows the user to
control both channels shutdown pins simultaneously by
driving the provided user pad SHDN with an external
source (see Figure 1 for shunt configuration). SHDNL
and SHDNR are CMOS logic-level inputs.
Layout Considerations
To optimize the audio performance of the MAX4410, it
is important to follow these layout guidelines. The
MAX4410 EV kit uses two ground planes to minimize
switching noise from the charge pump coupling into the
audio signal. The two planes are star-connected at one
point (GND pad). Capacitors C5, C6, and C7 should be
placed close to the IC and connected with wide traces.
Short, wide traces should be used to connect the
power pins of the IC to the power supply.
Table 1. Shutdown Selection
JUMPER
SHUNT
POSITION
DESCRIPTION
1-2 Left channel enabled
JU1
2-3 Left channel disabled
1-2 Right channel enabled
JU2
2-3 Right channel disabled
JU1 JU2
1
2
3
1
2
3
Figure 1. Simultaneous Shutdown Control