19-3392; Rev. 0; 10/04 MAX4411 Evaluation Kit 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 Ordering Information PART TEMP RANGE IC PACKAGE MAX4411EVKIT 0C to +70C 20 Thin QFN Component Suppliers SUPPLIER PHONE FAX WEBSITE AVX 843-946-0238 843-626-3123 www.avxcorp.com Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Indicate that you are using the MAX4411 when contacting these component suppliers. Component List DESIGNATION QTY C1, C2, C3 C4 C5 DESCRIPTION 3 2.2F 10%, 6.3V X5R ceramic capacitors (0603) TDK C1608X5R0J225K Taiyo Yuden JMK107BJ225KA 1 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M Taiyo Yuden JMK212BJ106MG 1 0.1F 10%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C104K Taiyo Yuden EMK107BJ104KA DESIGNATION QTY DESCRIPTION C6, C7 2 1.0F 10%, 16V tantalum capacitors (A-case) AVX TAJA105K016R Stereo headphone jack (3.5mm dia.) J1 1 JU1, JU2 2 3-pin headers None 2 Shunts R1, R2 2 10k 1% resistors (0603) U1 1 MAX4411ETP (20-pin TQFN, 4mm x 4mm x 0.8mm) None None None 1 1 1 MAX4411 EV kit PC board MAX4411 EV kit data sheet MAX4411 data sheet ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX4411 General Description Evaluates: MAX4411 MAX4411 Evaluation Kit 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 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. 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. Layout Considerations 4) Connect the disabled audio source between IN_ and GND. 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. 5) Connect the 1.8V to 3.6V DC power supply to the VDD and GND pads. Note: Capacitors C1 and C2 can be reduced in size. See Figure 3 and the MAX4411 data sheet for details. 6) Turn on the DC power supply. Table 1. Shutdown Selection 1) Plug the headphones into the 3.5mm headphone jack. 3) Ensure that the stereo audio source is turned off. 7) Enable the stereo audio source. JUMPER 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. 2 JU1 JU2 SHUNT POSITION DESCRIPTION 1-2 Left channel enabled 2-3 Left channel disabled 1-2 Right channel enabled 2-3 Right channel disabled 1 1 2 2 3 3 JU1 JU2 Figure 1. Simultaneous Shutdown Control _______________________________________________________________________________________ MAX4411 Evaluation Kit Evaluates: MAX4411 C1 2.2F + VDD R1 10k C3 2.2F U1 INL N.C. MAX4411 12 N.C. PVDD 14 SHDNR C5 0.1F 6 OUTL 5 N.C. 7 OUTR SVDD GND VDD R2 10k 10 11 N.C. 8 VDD 1 2 SHDNL 3 JU1 18 19 C4 10F 16 SHDNL 4 VDD N.C. INR PVSS INL 17 SGND 13 20 N.C. - C7 1F C1N 15 3 SVSS INR - C1P + 2 PGDN 1 C6 1F VDD 1 2 SHDNR 3 JU2 9 C2 2.2F 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 OUTPUT POWER (mW) 70 60 50 C1 = C2 = 0.68F 40 C1 = C2 = 0.47F 30 20 fIN = 1kHz THD+N = 1% INPUTS IN PHASE 10 0 10 20 30 40 50 LOAD RESISTANCE () Figure 3. Output Power vs. C1 and C2 Figure 4. MAX4411 EV Kit Component Placement Guide-- Component Side _______________________________________________________________________________________ 3 Evaluates: MAX4411 MAX4410 Evaluation Kit 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.