19-2185; Rev 0; 10/01 MAX4299 Evaluation Kit Features ♦ 4.5V to 5.5V Single-Supply Operation ♦ Clickless/Popless Power-Up, Power-Down, Mute and Unmute ♦ PC99-Compliant Output Drivers: Better than 1.2VRMS Output into 32Ω Audio Load ♦ PC99-Compliant Microphone Amplifier: Better than 1.5VRMS Output into 10kΩ Load ♦ Small 16-Pin TSSOP Package ♦ Fully Assembled and Tested Component Suppliers SUPPLIER Ordering Information PHONE FAX PART TEMP RANGE IC PACKAGE AVX 843-448-9411 843-448-1943 MAX4299EVKIT 0°C to +70°C 16 TSSOP Central Semiconductor 631-435-1110 631-435-1824 Taiyo Yuden 800-348-2496 847-925-0899 Note: Please indicate that you are using the MAX4299 when contacting these component suppliers. Component List DESIGNATION QTY C1, C10 2 C2, C3, C6 C4, C5, C12 C7, C8, C9 C11 D1 DESCRIPTION DESIGNATION QTY DESCRIPTION 10µF, 6.3V X5R ceramic capacitors (1206) Taiyo Yuden JMK316BJ106ML J1 1 Right-angle phono jack (white) J2 1 Right-angle phono jack (red) J3 1 Right-angle phono jack (yellow) 0.33µF, 10V X5R ceramic capacitors (0603) Taiyo Yuden LMK107BJ334KA J4, J5 R1, R4, R5, R6, R8 R2, R3 2 3.5mm stereo jacks 3 5 20kΩ ±1% resistors (0805) 0 Not installed (0805) 3 1µF, 6.3V X5R ceramic capacitors (0603) Taiyo Yuden JMK107BJ105KA R7 1 200kΩ ±1% resistor (0805) R9 1 2kΩ ±1% resistor (0805) R10, R11, R12 3 100kΩ ±5% resistors (0805) JU1 1 2-pin header JU2 1 3-pin header None 2 Shunts (JU1, JU2) None 1 MAX4299 PC board None 1 MAX4299 data sheet None 1 MAX4299 EV kit data sheet U1 1 MAX4299EUE, 16-pin TSSOP 3 1 1 220µF, 6.3V tantalum capacitors (Case C) AVX TAJC227K006 0.1µF, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ104KA 0.2A, 30V super-mini Schottkydiode (SOD-323) Central Semiconductor CMDSH2-3 ________________________________________________________________ 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: MAX4299 General Description The MAX4299 evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX4299 audio system IC designed for a single 5V application. The audio system IC features a stereo headphone driver, microphone amplifier, and a 3.3V linear regulator. The EV kit’s headphone driver is capable of driving 1.2VRMS into a 32Ω headphone. The microphone amplifier is capable of driving 1.5VRMS into a 10kΩ load. A 3.3V linear regulator is capable of supplying 100mA. Evaluates: MAX4299 MAX4299 Evaluation Kit Quick Start The MAX4299 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. Recommended Equipment • 5V, 1A power supply • Stereo headphone with 3.5mm plug • Microphone • Audio source • One voltmeter AVDD Output 1) Connect the positive lead of the voltmeter to the AVDD pad, and the negative lead of the voltmeter to the GND pad. 2) Connect the 5V of the power supply to the VCC pad and the power supply ground to the PGND pad. 3) Turn on the power supply, and set the output of the power supply to 5V. 4) Verify that the AVDD pad is approximately 3.3V. Headphone Drivers 1) Verify that Jumper JU1 does not have a shunt installed. 2) Verify that Jumper JU2 has a shunt across pins 2 and 3. 3) Connect an audio source to jacks J1 (left) and J3 (right). 4) Connect the stereo headphone to the J5 jack. 5) Turn on the audio source. Microphone Amplifier 1) Verify that Jumper JU1 does not have a shunt installed. 2) Verify that Jumper JU2 has a shunt across pins 2 and 3. 3) Connect a microphone to the MICIN jack J4. 4) Remove the audio source from jacks J1 and J3, and connect the MICOUT jack (J2) to J1. 6) Speak into the microphone and detect the audio signal with the headphone (left channel only). Detailed Description The MAX4299 EV kit uses a MAX4299 audio system IC designed for 5V applications. The audio system IC features a stereo headphone driver, a microphone amplifier, and a 3.3V linear regulator. In addition, the EV kit also includes a mute function and a standby powersupply (SVCC) pad for the user. The MAX4299 EV kit is configured to receive two audio sources (left and right). The two audio sources are current-amplified (unity-voltage gain) to drive up to 1.2V RMS into a 32Ω stereo headphone. The microphone amplifier has voltage gain of -10V/V and is capable of driving 1.5VRMS into a 10kΩ load. The 3.3V linear regulator is capable of supplying up to 100mA. Resistors R2 and R3 may be added to adjust the output of the linear regulator between 1.2V and 4.5V. Refer to the Regulator section of the MAX4299 data sheet. Jumper Selection Mute Jumper JU1 controls the mute pin (MUTE) on the MAX4299 IC. Mute is a clickless function that turns off the headphone without having to power-down the whole system. The mute function may be activated on the EV kit by installing a shunt across pins 1 and 2 of jumper JU1. The mute function may also be controlled by an external source connected to the MUTE pad and removing the shunt on jumper JU1. See Table 1 for shunt positions. Standby Power Supply Jumper JU2 selects between an external standby power supply (SVCC) or the on-board SVCC. The standby power-supply pin (SVCC) draws a small amount of reserve power to drive a clickless/popless power-down sequence. The reserve power for SVCC can be stored in the capacitor C9. Capacitor C9 is charged by VCC through Schottky diode D1. The SVCC pin can also be powered by an external source connecting to the SVCC pad and reconfiguring jumper JU2. (See Table 2 for shunt positions.) 5) Connect a stereo headphone to jack J5 (headphone out). 2 _______________________________________________________________________________________ MAX4299 Evaluation Kit JUMPER JU1 JUMPER POSITION EV KIT FUNCTION Installed (MUTE = high) Mute enabled None (MUTE = low) Mute disabled Table 2. JU2 Jumper Selection JUMPER JU2 None. External source connected to MUTE pad. MUTE driven by external source. Mute is active high. Evaluates: MAX4299 Table 1. JU1 Jumper Selection JUMPER POSITION EV KIT FUNCTION 1-2 SVCC pin powered by external source (4.5V to 5.5V) 2-3 SVCC pin powered by VCC pad through D1 None SVCC is not powered. Clickless/Popless disabled. _______________________________________________________________________________________ 3 Evaluates: MAX4299 MAX4299 Evaluation Kit AVDD VCC 16 REG AVDD C1 10µF VCC R2 OPEN 1 GND SVCC U1 FB IN1 C4 1.0µF 11 BIAS R4 20kΩ 5 C2 0.33µF 2 1 C8 220µF 3 R12 100kΩ 5% 13 AVDD JU1 10 MUTE IN2 R10 100kΩ 5% C3 0.33µF 12 R5 20kΩ R11 100kΩ 5% MICIN C6 0.33µF 9 2 1 C11 0.1µF REGON PGND 3 MICOUT 8 1 J2 2 1 GND 4 NOTE: ALL RESISTORS ARE 1%, UNLESS OTHERWISE SPECIFIED. Figure 1. MAX4299 EV Kit Schematic 4 3 2 R7 200kΩ C12 1.0µF VCC R9 2kΩ J3 R8 20kΩ 15 J5 2 R6 20kΩ VCC J1 2 1 VCC PGND SVCC C7 220µF OUT2 C10 10µF 3 2 1 CBYPASS VCC MUTE 1 JU2 R1 20kΩ OUT1 C5 1.0µF 7 2 C9 220µF MAX4299 R3 OPEN 6 14 D1 _______________________________________________________________________________________ J4 MAX4299 Evaluation Kit Evaluates: MAX4299 1.0" 1.0" Figure 2. MAX4299 EV Kit Component Placement Guide— Component Side Figure 3. MAX4299 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX4299 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 _____________________ 5 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.