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| 19-3301; Rev 0; 5/04 MAX9721 Evaluation Kit General Description The MAX9721 evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9721, a DirectDrive stereo headphone amplifier with -2V/V fixed gain for single 1.0V applications. The EV kit can be used to evaluate the MAX9721B (-1.5V/V fixed gain) and MAX9721C (-1V/V fixed gain). Single Power Supply: 0.9V to 1.8V 20mW per Channel into 32 25mW per Channel into 16 Low 0.006% THD+N 1A (typ) IC Shutdown Current Fixed -2V/V Gain (MAX9721A) Surface-Mount Construction Fully Assembled and Tested Features Evaluates: MAX9721A/B/C Component List DESIGNATION C1, C2, C3 QTY 3 DESCRIPTION 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K 4.7F 10%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J475K 0.47F 20%, 10V tantalum capacitors (0402) AVX TACK474M010 3-pin header 3.5mm SMT stereo headphone jack Not installed, test points MAX9721AETC (4mm x 4mm 12-pin TQFN) Not installed, MAX9721AEBC-T (4 x 3 UCSP) Shunt MAX9721 PC board PART MAX9721EVKIT Ordering Information TEMP RANGE 0C to +70C IC PACKAGE 12 TQFN (4mm x 4mm) Note: To evaluate the MAX9721B/C, request a MAX9721BETC/ MAX9721CETC free sample with a MAX9721 EV kit. C4 1 Quick Start The MAX9721 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. C5, C6 JU1 OUT OUTL, OUTR U1 U2 None None 2 1 1 2 1 0 1 1 Recommended Equipment * 1.5V, 150mA power supply * Stereo headphone with 3.5mm plug * Audio source (i.e., CD player, cassette player) 1) Verify that JU1 has a shunt across pins 1 and 2 (SHDN = VDD). 2) Plug the stereo headphone into the OUT jack. 3) Connect the 1.5V power supply to the VDD pad and the power-supply ground to the GND pad. 4) Connect the audio source to VINL and VINR pads. 5) Turn on the power supply, and then turn on the audio source. UCSP is a trademark of Maxim Integrated Products, Inc. Component Suppliers SUPPLIER AVX TDK PHONE 843-946-0238 847-803-6100 FAX 843-626-3123 847-390-4405 WEBSITE www.avxcorp.com www.component.tdk.com Note: Please indicate that you are using the MAX9721 when contacting these component suppliers. ________________________________________________________________ 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. MAX9721 Evaluation Kit Evaluates: MAX9721A/B/C Detailed Description The MAX9721 EV kit evaluates a class AB DirectDrive stereo headphone amplifier with a -2V/V fixed gain. The EV kit delivers up to 20mW per channel into a 32 load and achieves 0.006% THD+N. Jumper Selection Jumper JU1 controls the SHDN pin of the MAX9721 IC. See Table 1 for JU1 function. Evaluating MAX9721B/C To evaluate the MAX9721B/C with the MAX9721 EV kit, replace the MAX9721AETC with a MAX9721BETC or MAX9721CETC. Table 1. JU1 Function SHUNT LOCATION Pins 1 and 2 Pins 2 and 3 SHDN PIN Connected to VDD Connected to GND EV KIT OUTPUT Enabled Disabled VDD GND VDD C4 4.7F C3 1F 9 VDD 3 C6 0.47F VINR 4 2 5 VDD 1 2 3 JU1 C2 1F INR PVSS VSS C1N C1P 12 SHDN SGND 6 1 10 C1 1F INL 11 PGND OUTR 7 OUTL OUT C5 0.47F VINL OUTR U1 MAX9721 OUTL 8 Figure 1. MAX9721 EV Kit Schematic 2 _______________________________________________________________________________________ MAX9721 Evaluation Kit Evaluates: MAX9721A/B/C Figure 2. MAX9721 EV Kit Component Placement Guide-- Component Side Figure 3. MAX9721 EV Kit PC Board Layout--Component Side Figure 4. MAX9721 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 3 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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