MAX9719AEVKIT

19-3370; Rev 0; 7/04 MAX9719A Evaluation Kit The MAX9719A evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9719A stereo, differential audio amplifier to drive a pair of bridge-tiedload (BTL) speakers in portable audio applications. Designed to operate from a 2.7V to 5.5V DC power supply, the EV kit is capable of delivering 2 x 1.1W into a pair of 8Ω speakers. The MAX9719A inputs can accept a common-mode input voltage of 0.5V through (VCC - 1.2V) from a DC-coupled source, therefore eliminating the need for input-signal coupling capacitors. The EV kit provides an option to bypass the input-signal coupling capacitors when the DC offset level of the input signals is within an acceptable range. The MAX9719A EV kit also evaluates the MAX9719B, MAX9719C, and MAX9719D. Features ♦ Also Evaluates the MAX9719B/C/D (IC and Component Replacement Required) ♦ 2.7V to 5.5V Single-Supply Operation ♦ Drives 2 x 1.1W Into Stereo 8Ω Speakers at 1% THD+N ♦ Differential Inputs ♦ 100nA Shutdown Current (typ) ♦ Small 16-Pin TQFN (4mm x 4mm) Package ♦ Also Available in 16-Bump UCSP and 16-Pin TSSOP-EP Packages ♦ Fully Assembled and Tested Ordering Information Component List DESIGNATION QTY A1 0 MAX9719AEBE (16-pin UCSP) 4 0.47µF ±20%, 16V film chip capacitors (1206) Panasonic ECPU1C474MA5 C5 1 10µF ±20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M C6, C7 2 1µF ±10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K C1–C4 C8 1 DESCRIPTION 0.1µF ±10%, 25V X7R ceramic capacitor (0603) TDK C1608X7R1E104K C9–C12 0 Not installed, capacitors (0603) R1–R8 8 10kΩ ±1% resistors (0603) U1 1 MAX9719AETE (16-pin TQFN) JU1–JU4 4 2-pin headers JU5 1 3-pin header None 5 Shunts None 1 MAX9719A PC board PART MAX9719AEVKIT TEMP RANGE IC PACKAGE 0°C to +70°C 16-TQFN-EP* (4mm x 4mm) *EP = Exposed paddle. Quick Start The MAX9719A 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 • • • 1) 2.7V to 5.5V, 3A power supply Audio signal source with stereo outputs Two 8Ω speakers Verify that no shunts are installed on jumpers JU1–JU4 (input-signal coupling capacitors are in circuit). 2) Verify that a shunt is installed across pins 1 and 2 of jumper JU5 (EV kit ON). 3) Connect the first 8Ω speaker across the OUTR+ and OUTR- PC board pads. 4) Connect the second 8Ω speaker across the OUTL+ and OUTL- PC board pads. Component Suppliers SUPPLIER PHONE FAX Panasonic 714-373-7366 714-737-7323 WEBSITE www.panasonic.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Indicate that you are using the MAX9719AEVKIT when contacting these component suppliers. ________________________________________________________________ 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: MAX9719A/B/C/D General Description Evaluates: MAX9719A/B/C/D MAX9719A Evaluation Kit 5) Connect the positive terminal of the power supply to the VCC pad and the power-supply ground terminal to the GND pad. 6) Connect the first output of the stereo audio source across the INPUTR+ and INPUTR- pads. Table 1. JU5 Jumper Selection SHUNT POSITION 7) Connect the second output of the stereo audio source across the INPUTL+ and INPUTL- pads. 8) Turn on the power supply. 9) Turn on the audio source. EV KIT FUNCTION 1-2 (SHDN = high) EV kit enabled 2-3 (SHDN = low) Shutdown mode None. External logic connected to SHDN pad. SHDN driven by external logic. Shutdown is active low. Bypassing the Input-Signal Coupling Capacitors (C1–C4) Jumpers JU1–JU4 provide an option to bypass the input-signal coupling capacitors C1–C4, respectively, on the MAX9719A EV kit. See Table 2 for the various shunt positions. Refer to the Input Filter section of the MAX9718/MAX9719 data sheet Detailed Description The MAX9719A EV kit features the MAX9719A stereo differential audio amplifier, designed to drive a pair of 8Ω speakers in portable audio applications. The EV kit operates from a DC power supply that can provide 2.7V to 5.5V and 3A of current. Table 2. JU1–JU4 Jumper Selection As configured, the EV kit is set for a gain of 1V/V (0dB) by gain-setting resistors R1–R8. To set the EV kit to a different gain, select other gain-setting resistors. Refer to the Applications Information section in the MAX9718/ MAX9719 data sheet for selecting the resistors. Capacitors C9–C12 are used for optionally limiting the audio signal bandwidth. SHUNT POSITION Not Installed (default) Installed INPUT-SIGNAL COUPLING CAPACITORS In circuit DC-coupled inputs Evaluating MAX9719B/MAX9719C/MAX9719D The MAX9719A EV kit can evaluate the MAX9719B, MAX9719C, and MAX9719D. To evaluate a different IC, replace U1 with the desired part, and replace the components as outlined in Table 3. Refer to the MAX9718/ MAX9719 data sheet for additional information. Jumper Selection Shutdown Mode (SHDN) The MAX9719A features a shutdown mode that reduces the MAX9719A quiescent current to 100nA (typ). Jumper JU5 controls the shutdown pin (SHDN) of the MAX9719A IC. See Table 1 for shunt positions. Table 3. Component Values for Evaluating Different Versions of the MAX9719 2 COMPONENT EVALUATING THE MAX9719A EVALUATING THE MAX9719B EVALUATING THE MAX9719C EVALUATING THE MAX9719D U1 MAX9719A MAX9719B MAX9719C MAX9719D R1, R3, R5, R7 10kΩ 0Ω 0Ω 0Ω R2, R4, R6, R8 10kΩ OPEN OPEN OPEN _______________________________________________________________________________________ MAX9719A Evaluation Kit Evaluates: MAX9719A/B/C/D C10 OPEN R4 10kΩ 1% C9 OPEN GND R2 10kΩ 1% JU1 C1 0.47µF INPUTL- C2 0.47µF INPUTL+ R1 10kΩ 1% 3 R3 10kΩ 1% 4 VCC JU2 VCC 13 8 14 C6 1µF C5 10µF C7 1µF GND 11 6 1 INL- OUTL+ INL+ OUTL- INPUTR- INPUTR+ C4 0.47µF JU4 GND OUTL- 10 N.C. VCC VCC GND GND BIAS U1 5 C8 0.1µF VCC MAX9719A SHDN GND 9 JU3 C3 0.47µF OUTL+ 7 1 2 JU5 SHDN 3 R5 10kΩ 1% R7 10kΩ 1% 16 2 INR- OUTR+ INR+ OUTR- 12 15 OUTR+ OUTR- R8 10kΩ 1% C12 OPEN R6 10kΩ 1% C11 OPEN Figure 1. MAX9719A EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX9719A/B/C/D MAX9719A Evaluation Kit Figure 2. MAX9719A EV Kit Component Placement Guide— Component Side Figure 3. MAX9719A EV Kit PC Board Layout—Component Side Figure Figure 4. MAX9719A 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 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.