19-4495; Rev 0; 2/09
MAX4993 Evaluation Kit
General Description
The MAX4993 evaluation kit (EV kit) demonstrates the
MAX4993 double-pole/double-throw (DPDT) analog
switch featuring low on-resistance (0.3Ω R
ON
) and slow
turn-on time for click-and-pop reduction in portable
audio applications. The IC features a space-saving
package, low THD+N (0.004%), and low supply current
(1.2μA at 3V). The EV kit can operate from a 1.8V to
5.5V DC power supply and comes configured to oper-
ate from USB power.
Features
♦
Demonstrates Slow Turn-On for Built-In Click-
and-Pop Reduction
♦
Low 0.3Ω On-Resistance (R
ON
)
♦
0.004% THD+N in Audio Applications
♦
1.8V to 5.5V DC Supply Operation
♦
Demonstrates USB Power Operation
♦
Lead(Pb)-Free and RoHS Compliant
♦
Fully Assembled and Tested
Evaluates: MAX4993
Ordering Information
PART
MAX4993EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
C1, C3, C4,
C5, C8
5
DESCRIPTION
0.1μF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
10μF ±10%, 10V X7R ceramic
capacitor (0805)
Murata GRM21BR71A106K
220μF ±10%, 6.3V low-ESR tantalum
capacitors (D size)
KEMET B45197A1227K409
Not installed, ferrite-bead
inductor—short (0603)
Not installed, miniature PCB test points
DESIGNATION QTY
JU1, JU2, JU3
JU4, JU5
OUT
R1–R4
R5, R7
R6, R8
U1
USB
—
0
—
3
2
1
4
2
2
1
1
5
1
DESCRIPTION
3-pin headers
2-pin headers
Stereo headphone jack (3.5mm)
0Ω ±5% resistors (1206)
330Ω ±5% resistors (0603)
150Ω ±5% resistors (0603)
DPDT audio switch (10 UTQFN)
Maxim MAX4993EVB+
(Top Mark: AAF)
USB type-B right-angle receptacle
Shunts (JU1–JU5)
PCB: MAX4993 Evaluation Kit+
C2
1
C6, C7
2
FB1
GND, OUTL,
OUTR
0
Component Suppliers
SUPPLIER
KEMET Corp.
Murata Electronics North America, Inc.
PHONE
864-963-6300
770-436-1300
www.kemet.com
www.murata-northamerica.com
WEBSITE
Note:
Indicate that you are using the MAX4993 when contacting these suppliers.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX4993 Evaluation Kit
Evaluates: MAX4993
Quick Start
Required Equipment
•
•
•
•
User-supplied PC with a spare USB port
A-to-B USB cable
One stereo headphone
Two audio signal sources ranging between 0 and 5V
Detailed Description of Hardware
The MAX4993 evaluation kit (EV kit) demonstrates the
MAX4993 DPDT analog switch in a 1.4mm x 1.8mm 10-
pin ultra-thin QFN package specified for operating over
the -40°C to +85°C extended temperature range. The
IC’s slow turn-on time provides click-and-pop reduction
without additional parts in portable audio applications.
The IC features low 0.3Ω R
ON
resistance, low 0.004%
THD+N distortion in audio applications, and demon-
strates low supply current. An active-low output enable
pin (EN) can set the switches to high-impedance mode.
The COM_, NC_1, NC_2, NO_1, and NO_2 PCB pads
can pass up to ±350mA of continuous current through
the MAX4993 IC. The EV kit can operate from a 1.8V to
5.5V DC power supply and also comes configured to
operate from USB power.
The user may install optional input resistors in place of
the default 0Ω resistors (R1–R4). Resistor-divider pairs
R5/R6 and R7/R8 and jumpers JU4 and JU5 provide
the ability to add a DC bias to the NO_1 and NO_2 PCB
pads for demonstrating the slow turn-on feature.
Capacitors C6 and C7 provide DC voltage blocking for
the OUT headphone jack signals. Test points OUTL,
OUTR, and GND provide access to the OUT head-
phone jack signals.
Procedure
The MAX4993 EV kit is fully assembled and tested. Follow
the steps below to verify board operation.
Caution: Do
not connect a signal to the NO_1, NO_2, NC_1, or
NC_2 PCB pads until power is supplied to VCC.
1) Connect the
powered
USB cable from the comput-
er to the EV kit’s USB receptacle.
2) Verify that shunts are installed as follows:
JU1: Pins 1-2 (USB power to VCC)
JU2: Pins 1-2 (NO_ terminals selected)
JU3: Pins 2-3 (switches enabled)
JU4: Not installed (no input DC biasing on NO_1
PCB pad)
JU5: Not installed (no input DC biasing on NO_2
PCB pad)
3) Verify that the stereo audio source outputs are dis-
abled.
4) Connect one audio source’s right channel to the
NO_1 PCB pad, the left channel to the NO_2 PCB
pad, and the audio ground return to the nearby
GND PCB pad.
5) Connect the other audio source’s right channel to
the NC_1 PCB pad, the left channel to the NC_2
PCB pad, and the audio ground return to the near-
by GND PCB pad.
6) Plug the headphone into the OUT headphone jack.
7) Enable the audio sources.
8) Verify that the headphone is playing the audio
source connected to the NO_1 and NO_2 PCB pads.
9) Move the jumper JU2 shunt to pins 2-3.
10) Verify that the headphone is playing the audio source
connected to the NC_ 1 and NC_2 PCB pads.
Power Supply
Jumper JU1 provides two options for powering the
MAX4993 VCC supply input. VCC can operate from a
user-supplied 1.8V to 5.5V DC power supply connected
across the VIN and GND PCB pads or from a 5V USB
power source. See Table 1 to configure the VCC supply
options using jumper JU1.
Table 1. Power Supply Configuration (JU1)
SHUNT
POSITION
1-2*
VCC PIN
CONNECTION
+5V bus
MAX4993 VCC POWER
Connect a
powered
USB
cable to receptacle USB.
VCC set to 5V USB power.
User-provided DC power
supply. VCC range: 1.8V to
5.5V.
2-3
VIN PCB pad
*Default
position.
2
_______________________________________________________________________________________
MAX4993 Evaluation Kit
Digital Control
Jumper JU2 configures the MAX4993 digital-control bit,
CB. The CB input sets the position of the switches to
either the NO_ or NC_ terminals. Remove capacitor C8
to drive the CB signal using an external controller con-
nected to the CB and nearby GND PCB pads. See
Table 2 to set CB using jumper JU2.
NO_ DC Offset
Jumpers JU4 and JU5 give the option to provide a DC
offset to the NO_1 and NO_2 PCB pads, respectively.
Install shunts on jumpers JU4 and JU5 to enable the
DC offset voltages. Resistor-dividers R5/R6 and R7/R8
are configured to provide an offset voltage given by the
equation below:
V
OFFSET
= 0.3125 x VCC
where V
OFFSET
is the offset voltage applied to the
NO_1 and NO_2 PCB pads and VCC is the MAX4993
supply voltage.
To use a different offset voltage, select a different value
for R6 and R8 and use the equation below to determine
R5 and R7:
R
BOTTOM
(
VCC - V
OFFSET
)
R
TOP
=
V
OFFSET
where the suggested R
BOTTOM
range is 100Ω to 1MΩ
and R
BOTTOM
is resistor R6 or R8, R
TOP
is resistor R5
or R7, the VCC range is 1.8V to 5.5V, and V
OFFSET
is
the desired offset voltage.
Evaluates: MAX4993
Switch Enable
Jumper JU3 configures the MAX4993 enable input,
EN.
The
EN
signal can also be driven by an external con-
troller using the
EN
and nearby GND PCB pads. See
Table 3 to set
EN
using jumper JU3.
Table 2. Digital Control Configuration (JU2)
SHUNT
POSITION
1-2*
2-3
—
CB PIN
Connected to
VCC
Connected to
GND
Connected to
CB PCB pad
SWITCH POSITION
NO_
NC_
Driven by external controller.
Remove capacitor C8.
*Default
position.
Table 3. Switch Enable Configuration (JU3)
SHUNT
POSITION
1-2
2-3*
—
EN
PIN
Connected to
VCC
Connected to
GND
Connected to
EN
PCB pad
SWITCH ENABLE
Switches set to high
impedance
Switches enabled
Driven by external controller
*Default
position.
_______________________________________________________________________________________
3
MAX4993 Evaluation Kit
Evaluates: MAX4993
Figure 1. MAX4993 EV Kit Schematic
4
_______________________________________________________________________________________
MAX4993 Evaluation Kit
Evaluates: MAX4993
Figure 2. MAX4993 EV Kit Component Placement Guide—Component Side
Figure 3. MAX4993 EV Kit PCB Layout—Component Side
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5
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