19-2704; Rev 0; 12/02 MAX4365 Evaluation Kit The MAX4365 evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX4365 highpower bridged amplifier to drive loudspeakers in portable audio applications. Designed to operate from a 2.7VDC to 5.5VDC power supply, the EV kit is capable of delivering 1W into an 8Ω load. Features ♦ 2.7V to 5.5V Single-Supply Operation ♦ Drives 1W into an 8Ω Speaker ♦ 0.1% THD+N at 1kHz ♦ Externally Adjustable Gain ♦ Clickless/Popless Operation ♦ 5mA Supply Current, 10nA Shutdown Current ♦ Tiny 8-Pin Thin QFN Package (3mm ✕ 3mm ✕ 0.8mm), Also Available in 8-Pin µMAX Package ♦ Fully Assembled and Tested Component List DESIGNATION QTY A1 1 MAX4365EUA (8-pin µMAX) C1 1 0.1µF ±10%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C104K C2 1 10µF ±20%, 6.3V X5R ceramic capacitor (1206) TDK C3216X5R0J106M C3 1 1.0µF ±10%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J105K C4 1 DESCRIPTION 0.033µF ±5%, 50V C0G ceramic capacitor (1206) TDK C3216C0G1H333J C5 0 Not installed (0603) IN 1 Right-angle phono jack (red) JU1 1 2-pin header R1, R2 2 20kΩ ±1% resistors (0805) R3–R6 4 100kΩ ±5% resistors (0603) None 1 Shunt (JU1) None 1 MAX4365 PC board U1 1 MAX4365ETA (8-pin thin QFN) Ordering Information PART TEMP RANGE IC PACKAGE MAX4365EVKIT 0°C to +70°C 8 Thin QFN Quick Start The MAX4365 EV kit is fully assembled and tested. Follow the steps listed below to verify board operation. Do not turn on the power supply until all connections are completed. Recommended Equipment • 5V, 1A power supply • 8Ω speaker • Audio source (e.g., CD player, tape player) Setup 1) Verify that jumper JU1 (SHDN) does not have a shunt installed. 2) Connect the 8Ω speaker across the OUT+ and OUT- pads. 3) Connect an audio source to the input jack (IN). 4) Connect the 5V terminal of the power supply to the VCC pad and the ground terminal of the power supply to the GND pad. 5) Turn on the power supply. 6) Turn on the audio source. ________________________________________________________________ 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: MAX4365 General Description Evaluates: MAX4365 MAX4365 Evaluation Kit Component Suppliers SUPPLIER TDK PHONE FAX WEBSITE 847-803-6100 847-390-4405 www.component.tdk.com Note: Please indicate that you are using the MAX4365 when contacting these component suppliers. Detailed Description The MAX4365 EV kit contains the MAX4365 high-power bridged amplifier, designed to drive loudspeakers in portable audio applications. The EV kit is designed to operate with a 2.7V to 5.5V, 1A power supply. The EV kit can accept audio source inputs (IN) with peak-topeak amplitudes up to VCC. The audio source is amplified to drive 1W into an 8Ω speaker. The MAX4365 EV kit has positive and negative differential outputs that are 180° out of phase and are DC offset to VCC/2. This allows the voltage at the load to see a peak voltage of almost VCC. The closed-loop gain of the EV kit is configured for 2V/V, but can be reconfigured to other gains. Refer to the Gain-Setting Resistors section of the MAX4364/MAX4365 data sheet. However, if the closed-loop gain is reconfigured to greater than 10, a feedback capacitor, C5, can be added to limit the bandwidth, or to compensate for stray capacitance at the inverting input. The MAX4365 EV kit’s component values have been chosen to minimize audible clicks and pops during power-up, power-down, and shutdown transitions. With these component values, the frequency response is tailored for small loudspeaker applications, where response below 300Hz is less critical (refer to the Bias Capacitor section of the MAX4364/MAX4365 data sheet for further details on component selection). Jumper Selection Shutdown Jumper JU1 controls the MAX4365’s shutdown pin (SHDN). The shutdown function can be activated on the MAX4365 EV kit by installing a shunt across the pins of JU1. The shutdown function can also be controlled by an external source connected to the SHDN pad and removing the shunt on JU1 (see Table 1 for shunt positions). Note: When measuring supply current in shutdown mode, the bias through resistor R3 and JU1 must be taken into account. The shutdown current can be calculated by the following equation: Table 1. JU1 Jumper Selection JUMPER JU1 SHUNT POSITION EV KIT FUNCTION Installed (SHDN = high) Shutdown mode None (SHDN = low) EV kit enabled None. External controller connected to SHDN pad (TTL/CMOS input). SHDN driven by external controller. Shutdown is active high. VCC SHDN VCC JU1 7 SHDN R3 100kΩ C1 0.1µF 1 C3 1µF TP2 IN TP1 4 2 1 R4 100kΩ BIAS GND U1 MAX4365 IN- OUT- OUT- 8 R5 100kΩ OUT+ 5 R2 20kΩ OUT+ R6 100kΩ R1 20kΩ C5 OPEN Figure 1. MAX4365 EV Kit Schematic ISUPPLY = IRES + IMAX4365 IRES = VCC / R 3 2 C2 10µF GND 3 2 IN+ C4 0.033µF VCC VCC 6 _______________________________________________________________________________________ MAX4365 Evaluation Kit Evaluates: MAX4365 Figure 2. MAX4365 EV Kit Component Placement Guide— Component Side Figure 3. MAX4365 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 3 Evaluates: MAX4364 MAX4364 Evaluation Kit Figure 4. MAX4365 EV Kit PC Board Layout—Solder Side Figure 5. MAX4365 EV Kit Component Placement Guide— 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.