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19-3392; Rev. 0; 10/04
MAX4411 Evaluation Kit
General Description
The MAX4411 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX4411 fixed gain, DirectDriveTM stereo headphone amplifier. The DirectDrive architecture of the MAX4411 eliminates the two large DC-blocking capacitors typically required between the output of the amplifier and the headphones. Additionally, the gain of the amplifier is set internally, (-1.5V/V, MAX4411 and -2V/V, MAX4411B) further reducing component count.
Features
No Bulky DC-Blocking Capacitors Required Fixed Gain Eliminates External Feedback Network MAX4411: -1.5V/V MAX4411B: -2V/V 1.8V to 3.6V Single-Supply Operation 80mW Per Channel into 16 Low 0.003% THD+N at 1kHz Independent Left/Right, Low-Power Shutdown Controls Ultra-Compact Solution Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX4411
Ordering Information
PART MAX4411EVKIT TEMP RANGE 0C to +70C IC PACKAGE 20 Thin QFN
Component Suppliers
SUPPLIER AVX Taiyo Yuden TDK PHONE 843-946-0238 800-348-2496 847-803-6100 FAX 843-626-3123 847-925-0899 847-390-4405 www.avxcorp.com www.t-yuden.com www.component.tdk.com WEBSITE
Note: Indicate that you are using the MAX4411 when contacting these component suppliers.
Component List
DESIGNATION QTY DESCRIPTION 2.2F 10%, 6.3V X5R ceramic capacitors (0603) TDK C1608X5R0J225K Taiyo Yuden JMK107BJ225KA 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M Taiyo Yuden JMK212BJ106MG 0.1F 10%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C104K Taiyo Yuden EMK107BJ104KA DESIGNATION QTY C6, C7 J1 JU1, JU2 None R1, R2 U1 None None None 2 1 2 2 2 1 1 1 1 DESCRIPTION 1.0F 10%, 16V tantalum capacitors (A-case) AVX TAJA105K016R Stereo headphone jack (3.5mm dia.) 3-pin headers Shunts 10k 1% resistors (0603) MAX4411ETP (20-pin TQFN, 4mm x 4mm x 0.8mm) MAX4411 EV kit PC board MAX4411 EV kit data sheet MAX4411 data sheet
C1, C2, C3
3
C4
1
C5
1
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX4411 Evaluation Kit Evaluates: MAX4411
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
Shutdown Control
The MAX4411 EV kit provides two shutdown pins (SHDNL and SHDNR) to disable the outputs, allowing each channel to be shut down independently. 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.
Procedure
The MAX4411 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) Verify that shunts are installed across pins 1 and 2 of jumpers JU1 and JU2. 1) Plug the headphones into the 3.5mm headphone jack. 3) Ensure that the stereo audio source is turned off. 4) Connect the disabled audio source between IN_ and GND. 5) Connect the 1.8V to 3.6V DC power supply to the VDD and GND pads. 6) Turn on the DC power supply. 7) Enable the stereo audio source.
Layout Considerations
To optimize the audio performance of the MAX4411, it is important to follow these layout guidelines. The MAX4411 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 C1, C2, and C3 should be placed close to the IC. Short, wide traces should be used to connect the power pins of the IC to the power supply. Note: Capacitors C1 and C2 can be reduced in size. See Figure 3 and the MAX4411 data sheet for details.
Table 1. Shutdown Selection
JUMPER SHUNT POSITION 1-2 2-3 1-2 2-3 DESCRIPTION Left channel enabled Left channel disabled Right channel enabled Right channel disabled
Detailed Description
The MAX4411 is a fixed-gain, stereo headphone amplifier featuring Maxim's patented DirectDrive architecture. The device consists of two 80mW Class AB headphone amplifiers, an internal feedback network, undervoltage lockout (UVLO)/shutdown control, a charge pump, and comprehensive click-and-pop suppression circuitry. The MAX4411 EV kit has an internal gain of -1.5V/V and can be powered with a 1.8V to 3.6V single supply. The MAX4411 EV kit can be used to evaluate the MAX4411B. The MAX4411B has an internal -2V/V gain. To evaluate the MAX4411B, request a MAX4411BETP free sample with the MAX4411 EV kit.
JU1 JU2
1 2 3 JU1 JU2
1 2 3
Figure 1. Simultaneous Shutdown Control
2
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MAX4411 Evaluation Kit Evaluates: MAX4411
C1 2.2F
PGDN
C1N
SGND
C1P
N.C.
C6 1F INR + C7 1F INL + -
1 15 INR
2
3
20
17 N.C. 16 VDD R1 10k 18 SHDNL VDD 1 2 SHDNL 3 JU1 VDD R2 10k 14 SHDNR VDD 1 2 SHDNR 3 JU2
13 INL 4
U1
MAX4411
N.C. PVDD OUTR OUTL SVDD SVSS PVSS N.C.
N.C.
12
VDD GND
19 C4 10F C3 2.2F 10
N.C.
8
C5 0.1F
7
5 C2 2.2F
6
11
9 TP1 TP2 TP3
Figure 2. MAX4411 EV Kit Schematic
OUTPUT POWER vs. CHARGE-PUMP CAPACITANCE AND LOAD RESISTANCE
90 C1 = C2 = 2.2F 80 C1 = C2 = 1F 70 OUTPUT POWER (mW) 60 50 40 30 20 10 0 10 20 30 40 50 LOAD RESISTANCE () C1 = C2 = 0.47F fIN = 1kHz THD+N = 1% INPUTS IN PHASE C1 = C2 = 0.68F
Figure 3. Output Power vs. C1 and C2
Figure 4. MAX4411 EV Kit Component Placement Guide-- Component Side
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MAX4410 Evaluation Kit Evaluates: MAX4411
Figure 5. MAX4411 EV Kit PC Board Layout--Component Side
Figure 6. MAX4411 EV Kit Component Placement Guide-- Solder Side
Figure 7. MAX4411 EV Kit PC Board 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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