19-2276; Rev 0; 1/02 MAX4338 Evaluation Kit Features ♦ Capable of Driving a Stereo 32Ω Load (POUT = 60mW, VCC = 5V, THD + N = 1%, RL = 32Ω, fIN = 1kHz) (POUT = 20mW, VCC = 3V, THD + N = 1%, RL = 32Ω, fIN = 1kHz) ♦ Single-Supply Operation ♦ Low 0.1% THD + N (20Hz to 20kHz) (VCC = 5V, POUT = 40mW, RL = 32Ω) (VCC = 3V, POUT = 17mW, RL = 32Ω) ♦ Low-Profile Design (2.0mm, max) ♦ Fully Assembled and Tested Surface-Mount Board ♦ On-Board Shutdowns Ordering Information PART TEMP RANGE MAX4338EVKIT 0°C to +70°C IC PACKAGE 10 µMAX Note: To evaluate the MAX4233, request a MAX4233AUB free sample with the MAX4338EVKIT. Component List DESIGNATION QTY C1, C3 2 100pF ±10%, 10V ceramic capacitors (0402) TDK C1005C0G1H101K 2 Through-hole capacitors (not installed) 2 0.47µF ±10%, 20V tantalum capacitors (R-case) AVX TAJR474M020R C2, C4 C5, C6 C7 C8 C9, C10, C11 1 1 3 DESCRIPTION 1µF ±10%, 10V X5R ceramic capacitor (0603) TDK C1608X5R1A104K 0.1µF ±10%, 10V X5R ceramic capacitor (0402) TDK C1005X5R1A104K 220µF ±10%, 10V tantalum capacitors (Y-case) AVX TPSY227M010R0200 or Sprague 592D227X0010V2T DESIGNATION QTY DESCRIPTION J1 1 Phono jack (side-entry PC board mount) red J2 1 Phono jack (side-entry PC board mount) white J3 1 Stereo headphone jack (3.5mm dia.) JU1–JU5 5 2-pin headers R1, R2 R3, R4, 2 22.1kΩ ±1% resistors (0603) 6 100kΩ ±5% resistors (0603) R5, R6 2 47.5kΩ ±1% resistors (0603) R7, R8 2 Through-hole resistors (not installed) U1 1 MAX4338EUB (10-pin µMAX) None None 5 1 Shunts MAX4338 EV kit PC board None 1 MAX4335–MAX4338 data sheet Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ 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: MAX4338/MAX4233 General Description The MAX4338 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX4338 audio amplifier. The MAX4338 EV kit is designed to be driven by the lineout of a CD player or directly connected to any stereo audio source. The MAX4338 EV kit includes RCA jacks on the input and a 3.5mm headphone jack on the output to facilitate easy connections to the circuit board. This MAX4338 EV kit can also be used to evaluate the MAX4233 high-output-drive, Rail-to-Rail® op amp. Evaluates: MAX4338/MAX4233 MAX4338 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX WEBSITE AVX 843-946-0238 843-626-3123 www.avxcorp.com Sprague 402-563-6866 402-563-6296 www.vishay.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Please indicate that you are using the MAX4338 when contacting these component suppliers. Quick Start Required Equipment: • One pair of 32Ω headphones • One variable DC power supply capable of supplying between 2.7V and 5V at 200mA • One stereo audio source The MAX4338 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) Plug the headphones into the 3.5mm headphone jack. 2) Ensure that the audio source is turned off. 3) Connect the disabled audio source through the RCA phono jacks. 4) Ensure that the shunts JU1–JU5 are not installed. 5) Connect the 2.7V to 5V DC power supply to the VCC and GND pads. 6) Turn on the 2.7V to 5V DC power supply. 7) Turn on the audio source. 2 Detailed Description The MAX4338 EV kit is a stereo, single-supply audio amplifier. The MAX4338 EV kit is designed to be driven by the stereo lineout of a CD player or directly connected to any stereo audio source. The input impedance is 22.1kΩ. The -3dB corner frequencies are approximately 30Hz and 34kHz with a 32Ω load. The MAX4338 EV kit has a gain of approximately 2.1. An input signal of 700mVRMS, while using a 5V supply, produces a fullrange output with a 32Ω load. An input signal of 400mVRMS, while using a 3V supply, produces a fullrange output with a 32Ω load. Shutdown Control The MAX4338 EV kit provides two SHDN pins to disable the left and right outputs independently. Jumpers JU1 and JU2 control the left and right channels. Jumper JU3 connects both the left channel and right channel SHDN pins together so that both channels can be shut down simultaneously. Table 1 lists the options available for shutdown control. An external controller can be used by removing the shunts on JU1, JU2, JU3 and connecting the external controller to the pads labeled SHDN1 and SHDN2. SHDN1 and SHDN2 are TTL/CMOS logic-level inputs. _______________________________________________________________________________________ MAX4338 Evaluation Kit JU1 JUMPER JU2 Not Installed Not Installed Don’t Care Installed Not Installed Not Installed Installed Installed Installed Installed Not Installed Not Installed Installed JU3 DESCRIPTION JUMPER Left and right channels enabled JU4 Not Installed Right channel disabled JU5 Not Installed Left channel disabled Don’t Care Installed Left and right channels disabled Shutdown Current Measurements The MAX4338 EV kit has active-low shutdowns and uses pullup resistors (R9 and R10) to activate these shutdowns. Any shutdown current measurements should take into account the current being drawn through R9 and R10, as well as the current drawn through the bias resistors R3 and R4. This current can be calculated using the following equations (assumes both shutdowns are active): SHUNT POSITION Installed Not Installed Installed Not Installed FUNCTION C9 removed from circuit C9 remains in circuit C10 removed from circuit C10 remains in circuit Output Capacitor Jumper Selection Jumpers JU4 and JU5 removes the output DC-blocking capacitors (C9 and C10) from the circuit. This allows the user to drive a pure resistive load if desired. Inserting JU4 or JU5 produces an output on the corresponding channel with a DC component equal to midrail (VCC/2) and changes the -3dB highpass corner frequency of 30Hz (see Table 2 for shunt positions). Through-Hole Components The MAX4338 EV kit also provides pads for the user to solder up to two through-hole components per channel onto the PC board (R7, C2 and R8, C4). This allows the user access to test the op amps capacitive- and resistive-load driving capabilities, without having to access the output of the op amp through the headphone jack. ISUPPLY = IRES + IMAX4338 IRES = VCC V VCC + CC + R9 R10 R 3 + R4 The maximum shutdown current of the MAX4338 is 0.5µA. _______________________________________________________________________________________ 3 Evaluates: MAX4338/MAX4233 Table 2. DC-Blocking Capacitor Jumpers Table 1. Shutdown Selection Evaluates: MAX4338/MAX4233 MAX4338 Evaluation Kit C1 100pF C5 0.47µF 20V 2 INPUT1 J1 VCC 1 VCC VCC R5 47.5kΩ 1% C9 220µF 10V 1 3 MAX4338 3 5 R7 OPEN R11 100kΩ OUTPUT 1 TP2 SHDN1 R9 100kΩ C3 100pF C6 R2 0.47µF 22.1kΩ 20V 1% 2 INPUT2 JU5 JU1 J2 1 R6 47.5kΩ 1% 8 U1-B VCC MAX4338 SHDN2 C2 OPEN R4 100kΩ VCC JU3 J3 TP3 2 4 C7 1µF GND TP1 C8 0.1mF 10 U1-A R3 100kΩ SHDN1 C11 220µF 10V JU4 2 SHDN1 VCC R1 22.1kΩ 1% R10 100kΩ 7 9 C10 220µF 10V 6 R8 OPEN JU2 NOTE: INPUT1/SHDN1 REFERS TO THE RIGHT CHANNEL. INPUT2/SHDN2 REFERS TO THE LEFT CHANNEL. RING OF HEADPHONE JACK (J3) IS RIGHT. TIP OF HEADPHONE JACK (J3) IS LEFT. Figure 1. MAX4338 EV Kit Schematic 4 _______________________________________________________________________________________ C4 OPEN R12 100kΩ MAX4338 Evaluation Kit 1.0" Figure 2. MAX4338 EV Kit Component Placement Guide— Component Side Figure 3. MAX4338 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX4338 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX4338/MAX4233 1.0"