MAX4993EVKIT [MAXIM]
Demonstrates Slow Turn-On for Built-In Clickand Pop Reduction;
| 型号： | MAX4993EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Demonstrates Slow Turn-On for Built-In Clickand Pop Reduction |
| 文件： | 总6页 (文件大小：129K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4495; Rev 0; 2/09
MAX4993 Evaluation Kit
Evluates:MAX493
General Description
Features
The MAX4993 evaluation kit (EV kit) demonstrates the
MAX4993 double-pole/double-throw (DPDT) analog
♦ Demonstrates Slow Turn-On for Built-In Click-
and-Pop Reduction
switch featuring low on-resistance (0.3Ω R ) and slow
ON
♦ Low 0.3Ω On-Resistance (RON
)
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.
♦ 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
Ordering Information
PART
TYPE
MAX4993EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
JU1, JU2, JU3
JU4, JU5
OUT
3
2
1
4
2
2
3-pin headers
0.1μF 10%, 1ꢀV XꢁR ceramic
capacitors (0ꢀ03)
Murata GRM188Rꢁ1C104K
C1, C3, C4,
5
2-pin headers
C5, C8
Stereo headphone jack (3.5mm)
0Ω 5% resistors (120ꢀ)
330Ω 5% resistors (0ꢀ03)
150Ω 5% resistors (0ꢀ03)
DPDT audio switch (10 UTQFN)
Maxim MAX4993EVB+
(Top Mark: AAF)
10μF 10%, 10V XꢁR ceramic
capacitor (0805)
Murata GRM21BRꢁ1A10ꢀK
R1–R4
C2
1
2
R5, Rꢁ
Rꢀ, R8
220μF 10%, ꢀ.3V low-ESR tantalum
capacitors (D size)
KEMET B4519ꢁA122ꢁK409
Cꢀ, Cꢁ
FB1
U1
1
Not installed, ferrite-bead
inductor—short (0ꢀ03)
0
0
USB
—
1
5
1
USB type-B right-angle receptacle
Shunts (JU1–JU5)
GND, OUTL,
OUTR
Not installed, miniature PCB test points
—
PCB: MAX4993 Evaluation Kit+
Component Suppliers
SUPPLIER
PHONE
WEBSITE
KEMET Corp.
8ꢀ4-9ꢀ3-ꢀ300
ꢁꢁ0-43ꢀ-1300
www.kemet.com
Murata Electronics North America, Inc.
www.murata-northamerica.com
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
Quick Start
Required Equipment
User-supplied PC with a spare USB port
A-to-B USB cable
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.
•
•
•
•
One stereo headphone
Two audio signal sources ranging between 0 and 5V
The IC features low 0.3Ω R
resistance, low 0.004%
ON
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.
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)
The user may install optional input resistors in place of
the default 0Ω resistors (R1–R4). Resistor-divider pairs
R5/Rꢀ and Rꢁ/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 Cꢀ and Cꢁ 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.
Evluates:MAX493
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.
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.
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.
Table 1. Power Supply Configuration (JU1)
SHUNT
POSITION
VCC PIN
CONNECTION
ꢀ) Plug the headphone into the OUT headphone jack.
ꢁ) Enable the audio sources.
MAX4993 VCC POWER
Connect a powered USB
cable to receptacle USB.
VCC set to 5V USB power.
8) Verify that the headphone is playing the audio
source connected to the NO_1 and NO_2 PCB pads.
1-2*
+5V bus
9) Move the jumper JU2 shunt to pins 2-3.
User-provided DC power
supply. VCC range: 1.8V to
5.5V.
2-3
VIN PCB pad
10) Verify that the headphone is playing the audio source
connected to the NC_ 1 and NC_2 PCB pads.
*Default position.
2
_______________________________________________________________________________________
MAX4993 Evaluation Kit
Evluates:MAX493
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/Rꢀ and Rꢁ/R8
are configured to provide an offset voltage given by the
equation below:
V
= 0.3125 x VCC
OFFSET
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.
where V
is the offset voltage applied to the
OFFSET
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 Rꢀ and R8 and use the equation below to determine
R5 and Rꢁ:
Table 2. Digital Control Configuration (JU2)
R
V
OFFSET
VCC -
(
)
BOTTOM
R
=
SHUNT
POSITION
TOP
CB PIN
SWITCH POSITION
V
OFFSET
Connected to
VCC
where the suggested R
range is 100Ω to 1MΩ
BOTTOM
is resistor Rꢀ or R8, R
1-2*
NO_
NC_
and R
is resistor R5
BOTTOM
TOP
or Rꢁ, the VCC range is 1.8V to 5.5V, and V
the desired offset voltage.
is
OFFSET
Connected to
GND
2-3
Connected to
CB PCB pad
Driven by external controller.
Remove capacitor C8.
—
*Default position.
Table 3. Switch Enable Configuration (JU3)
SHUNT
POSITION
EN PIN
SWITCH ENABLE
Connected to
VCC
Switches set to high
impedance
1-2
Connected to
GND
2-3*
Switches enabled
Connected to
EN PCB pad
—
Driven by external controller
*Default position.
_______________________________________________________________________________________
3
MAX4993 Evaluation Kit
Evluates:MAX493
Figure 1. MAX4993 EV Kit Schematic
4
_______________________________________________________________________________________
MAX4993 Evaluation Kit
Evluates:MAX493
Figure 2. MAX4993 EV Kit Component Placement Guide—Component Side
Figure 3. MAX4993 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
5
MAX4993 Evaluation Kit
Evluates:MAX493
Figure 4. MAX4993 EV Kit PCB Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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