19-3248; Rev 0; 4/04 MAX9700B Evaluation Kit The MAX9700B evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9700B filterless class D amplifier to drive a mono bridge-tied-load (BTL) speaker in portable audio applications. Designed to operate from a 2.5V to 5.5V DC power supply, the EV kit is capable of delivering 1.2W into an 8 load. The EV kit accepts differential or single-ended input signals. The EV kit provides an option to select between different switching frequency modes of operation. The MAX9700B EV kit also evaluates the MAX9700A/ MAX9700C/MAX9700D and the MAX9712. Features Filterless Operation Passes FCC Radiated Emissions Evaluates the MAX9700A/B/C/D or MAX9712 (with IC Replacement) 2.5V to 5.5V Single-Supply Operation Up to 94% Efficiency Drives 1.2W into 8 Speaker at 1% THD+N Differential or Single-Ended Inputs Selectable Switching Frequency 0.1A Shutdown Current PART MAX9700BEVKIT Ordering Information Small 10-Pin TDFN Package TEMP RANGE 0C to +70C Also Available in 10-Pin MAX and 12-Bump UCSPTM Packages IC PACKAGE 10 TDFN-EP* *EP = Exposed paddle. Fully Assembled and Tested UCSP is a trademark of Maxim Integrated Products, Inc. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 0 Not installed, MAX9700BEUB (10-pin MAX) JU1 JU2 1 5-pin header 0 Not installed, MAX9700BEBC-T (12-bump UCSP) JU3 1 2-pin header L1, L2 0 2 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K Not installed, inductors recommended TOKO D53LC series L3, L4, L5 3 C3 1 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M Ferrite beads 100 at 100MHz, 50m DCR, 3A (0603) TDK MPZ1608S101A R1 1 49.9 1% resistor (0603) C4 0 Not installed, capacitor (0805) R2, R3 0 Not installed, resistors (0603) C5, C6 2 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K T1 0 C7, C8, C9, C11-C14 Not installed, common-mode choke 50VDC, 1ADC 800 at 100MHz recommended TDK ACM4532-801-2P-X 0 Not installed, capacitors (0603) U1 1 MAX9700BETB (10-pin TDFN, 3mm x 3mm x 0.8mm)) C10 1 None 3 Shunts (JU1, JU2, JU3) None 1 MAX9700B PC board A1 A2 C1, C2 100pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H101J 1 3-pin header ________________________________________________________________ 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: MAX9700A/B/C/D/MAX9712 General Description Evaluates: MAX9700A/B/C/D/MAX9712 MAX9700B Evaluation Kit Component Suppliers PHONE FAX TDK SUPPLIER 847-803-6100 847-390-4405 www.component.tdk.com WEBSITE TOKO 847-297-0070 847-699-1194 www.tokoam.com Note: Please indicate that you are using the MAX9700B when contacting these component suppliers. Quick Start The MAX9700B 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: * 2.5V to 5.5V, 1A power supply * Audio source (i.e. CD player, cassette player) short T1-1 to T1-4, and short T1-2 to T1-3. See Table 1 for the suggested filtering component values for an 8 load and a 30kHz cutoff frequency. Table 1. Suggested Filtering Components for an 8 Load and 30kHz Cut-Off COMPONENT VALUE L1, L2 15H C7, C8 0.033F * 8 speaker C9 0.15F C13, C14 0.068F R2, R3 22 Procedures: 1) Install a shunt across pins 1 and 2 of jumper JU1 (EV kit ON). 2) Install a shunt across pins 1 and 2 of jumper JU2 (internal oscillator set to spread-spectrum mode). 3) Verify that no shunt is across jumper JU3 (differential input mode). 4) Connect the 8 speaker across the OUT+ and OUT- test points. 5) Connect the positive terminal of the power supply to the VDD pad and the power-supply ground terminal to the GND pad. 6) Connect the audio source across the INPUT+ and INPUT- pads. 7) Turn on the power supply. 8) Turn on the audio source. Detailed Description The MAX9700B EV kit features the MAX9700B filterless class D amplifier IC, designed to drive a BTL mono speaker in portable audio applications. The EV kit operates from a DC power supply that can provide 2.5V to 5.5V and 1A of current. The EV kit accepts a differential or single-ended audio input. The audio input source is amplified to drive 1.2W into an 8 speaker. The EV kit provides three sets of differential outputs. The device outputs (OUT+/-) can be connected directly to a speaker load without any filtering. However, a filter can be added to ease evaluation. The filtered outputs (FOUTPUT+/-) require installation of filtering components L1, L2, C7, C8, C9, C13, C14, R2, and R3. When an LCR filter is required, remove C11, C12, and T1, 2 The MAX9700B is designed to pass FCC Class-B RF emissions without additional filtering when using 10cm of cable to connect the speaker. In applications where more margin and/or cable length are required, output capacitors C11, C12 and common-mode choke T1 can be added to reduce radiated emission. Connect the speaker to output +/- test points. Table 2 lists the cable length verses the required output components. Table 2. Cable Length vs. Suggested Output Components CABLE LENGTH X (CM) OUTPUT CAPACITOR C11 AND C12 COMMONMODE CHOKE T1 LCR FILTER L1, L2, C7, C8, C9, C13, C14, R2, R3 X < 10 -- -- -- 10 < X < 15 Required (100pF) -- -- 15 < X < 30 Required (100pF) Required -- -- Required* X > 30 -- *When an LCR filter is required, remove C11, C12 and T1, short T1-1 to T1-4, short T1-2 to T1-3. _______________________________________________________________________________________ MAX9700B Evaluation Kit Table 3. JU1 Jumper Selection Table 5. JU3 Jumper Selection SHUNT POSITION EV KIT FUNCTION 1-2 (SHDN = high) EV kit enabled 2-3 (SHDN = low) Shutdown mode None. External controller connected to SHDN pad (TTL). SHDN driven by external controller. Shutdown is active low. Switching Frequency Mode (Sync) Jumper JU2 provides an option to select the switching frequency of the MAX9700B IC. See Table 4 for the various shunt positions. Table 4. JU2 Jumper Selection SHUNT POSITION 1-2 (default) MAX9700B SYNC PIN SYNC pin = high SHUNT POSITION None (default) Installed (IN- pad connected to GND) EV KIT INPUT MODE Differential Input Mode Single-Ended Input Mode Evaluating the MAX9700A/MAX9700C/MAX9700D and the MAX9712 The MAX9700B EV kit can evaluate the MAX9700A, MAX9700C, MAX9700D, and the MAX9712. To evaluate a different IC, replace U1 with the desired part. Refer to the MAX9700 or the MAX9712 data sheets for additional information. INTERNAL OSCILLATOR FREQUENCY Spread-Spectrum Mode. Set at a switching frequency fSW = 1.22MHz 120kHz 1-3 SYNC pin = floating Set at fNOM = 1.45MHz 1-4 SYNC pin = external TTL-compatible clock input. External clock input connected to SYNC (TTL). Synchronized to the incoming TTL-compatible clock frequency 1-5 SYNC = low Set at the nominal _______________________________________________________________________________________ 3 Evaluates: MAX9700A/B/C/D/MAX9712 Jumper JU1 controls the shutdown pin (SHDN) of the MAX9700B IC. See Table 3 for shunt positions. Input Mode Jumper JU3 provides an option to select between a differential or single-ended input mode for the EV kit. See Table 5 for shunt positions. Jumper Selection Shutdown Mode (SHDN) Evaluates: MAX9700A/B/C/D/MAX9712 MAX9700B Evaluation Kit 1 VDD PVDD C2 0.1F C1 0.1F 4 L3 FERRITE INPUT+ 2 INPUT- 3 JU3 VDD 1 JU1 2 3 SHDN VDD SYNC C10 100pF 2 3 JU2 4 1 5 PGND GND IN+ C5 1.0F L4 FERRITE L5 FERRITE 10 U1 OUT- 6 R2 OPEN GND L2 OPEN 9 OUT- IN- C11 1 OPEN T1 OPEN 4 OUTPUTOUTPUT+ OUT+ OUT+ 5 C4 OPEN 7 MAX9700B C6 1.0F C3 10F VDD 2 8 C12 OPEN C13 OPEN C8 OPEN C9 OPEN FOUTPUTFOUTPUT+ 3 L1 OPEN C7 OPEN SHDN C14 OPEN R3 OPEN SYNC R1 49.9 1% Figure 1. MAX9700B EV Kit Schematic Figure 2. MAX9700B EV Kit Component Placement Guide-- Component Side 4 Figure 3. MAX9700B EV Kit PC Board Layout--Component Side _______________________________________________________________________________________ MAX9700B Evaluation Kit Figure 5. MAX9700B EV Kit PC Board Layout--GND Layer 3 Figure 6. MAX9700B EV Kit PC Board Layout--Solder Side Figure 7. MAX9700B 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX9700A/B/C/D/MAX9712 Figure 4. MAX9700B EV Kit PC Board Layout--GND Layer 2 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX9700BEVKIT