Evaluates: MAX9700A/B/C/D/MAX9712 19-3248 Rev 0 4/04 MAX9700B Evaluation Kit General Description Features The MAX9700B evaluation kit (EV kit) is a fully assembled Filterless Operation Passes FCC Radiated and tested circuit board that uses the MAX9700B filter- Emissions less class D amplifier to drive a mono bridge-tied-load Evaluates the MAX9700A/B/C/D or MAX9712 (with (BTL) speaker in portable audio applications. Designed to operate from a 2.5V to 5.5V DC power supply, the EV kit IC Replacement) is capable of delivering 1.2W into an 8 load. 2.5V to 5.5V Single-Supply Operation The EV kit accepts differential or single-ended input Up to 94% Efficiency signals. The EV kit provides an option to select between different switching frequency modes of operation. The Drives 1.2W into 8 Speaker at 1% THD+N MAX9700B EV kit also evaluates the MAX9700A/ Differential or Single-Ended Inputs MAX9700C/MAX9700D and the MAX9712. Selectable Switching Frequency 0.1A Shutdown Current Small 10-Pin TDFN Package Ordering Information Also Available in 10-Pin MAX and 12-Bump PART TEMP RANGE IC PACKAGE MAX9700BEVKIT 0C to +70C 10 TDFN-EP* UCSP Packages *EP = Exposed paddle. Fully Assembled and Tested UCSP is a trademark of Maxim Integrated Products, Inc. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JU1 1 3-pin header Not installed, MAX9700BEUB A1 0 (10-pin MAX) JU2 1 5-pin header JU3 1 2-pin header Not installed, MAX9700BEBC-T A2 0 (12-bump UCSP) Not installed, inductors L1, L2 0 recommended 0.1F 10%, 25V X7R ceramic TOKO D53LC series C1, C2 2 capacitors (0603) TDK C1608X7R1E104K Ferrite beads 100 at 100MHz, L3, L4, L5 3 50m DCR, 3A (0603) 10F 20%, 6.3V X5R ceramic TDK MPZ1608S101A C3 1 capacitor (0805) TDK C2012X5R0J106M R1 1 49.9 1% resistor (0603) C4 0 Not installed, capacitor (0805) R2, R3 0 Not installed, resistors (0603) 1F 10%, 10V X5R ceramic Not installed, common-mode choke C5, C6 2 capacitors (0603) 50VDC, 1ADC 800 at 100MHz T1 0 TDK C1608X5R1A105K recommended TDK ACM4532-801-2P-X C7, C8, C9, 0 Not installed, capacitors (0603) C11C14 MAX9700BETB U1 1 (10-pin TDFN, 3mm x 3mm x 0.8mm)) 100pF 5%, 50V C0G ceramic None 3 Shunts (JU1, JU2, JU3) C10 1 capacitor (0603) TDK C1608C0G1H101J None 1 MAX9700B PC board Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX9700B Evaluation Kit Component Suppliers SUPPLIER PHONE FAX WEBSITE TDK 847-803-6100 847-390-4405 www.component.tdk.com TOKO 847-297-0070 847-699-1194 www.tokoam.com Note: Please indicate that you are using the MAX9700B when contacting these component suppliers. short T1-1 to T1-4, and short T1-2 to T1-3. See Table 1 Quick Start for the suggested filtering component values for an 8 The MAX9700B EV kit is fully assembled and tested. load and a 30kHz cutoff frequency. Follow the steps listed below to verify board operation. Do not turn on the power supply until all connec- Table 1. Suggested Filtering Components tions are completed. for an 8 Load and 30kHz Cut-Off Recommended Equipment: 2.5V to 5.5V, 1A power supply COMPONENT VALUE L1, L2 15H Audio source (i.e. CD player, cassette player) C7, C8 0.033F 8 speaker C9 0.15F Procedures: C13, C14 0.068F 1) Install a shunt across pins 1 and 2 of jumper JU1 (EV kit ON). R2, R3 22 2) Install a shunt across pins 1 and 2 of jumper JU2 The MAX9700B is designed to pass FCC Class-B RF (internal oscillator set to spread-spectrum mode). emissions without additional filtering when using 10cm of 3) Verify that no shunt is across jumper JU3 (differen- cable to connect the speaker. In applications where more tial input mode). margin and/or cable length are required, output capaci- 4) Connect the 8 speaker across the OUT+ and tors C11, C12 and common-mode choke T1 can be OUT- test points. added to reduce radiated emission. Connect the speaker to output +/- test points. Table 2 lists the cable length 5) Connect the positive terminal of the power supply to verses the required output components. the VDD pad and the power-supply ground terminal to the GND pad. Table 2. Cable Length vs. Suggested 6) Connect the audio source across the INPUT+ and INPUT- pads. Output Components 7) Turn on the power supply. LCR FILTER CABLE OUTPUT COMMON- 8) Turn on the audio source. L1, L2, C7, C8, LENGTH X CAPACITOR MODE C9, C13, C14, Detailed Description (CM) C11 AND C12 CHOKE T1 R2, R3 The MAX9700B EV kit features the MAX9700B filterless X < 10 class D amplifier IC, designed to drive a BTL mono 10 < X < 15 Required (100pF) speaker in portable audio applications. The EV kit oper- ates from a DC power supply that can provide 2.5V to 15 < X < 30 Required (100pF) Required 5.5V and 1A of current. The EV kit accepts a differential X > 30 Required* or single-ended audio input. The audio input source is *When an LCR filter is required, remove C11, C12 and T1, short amplified to drive 1.2W into an 8 speaker. T1-1 to T1-4, short T1-2 to T1-3. 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 compo- nents L1, L2, C7, C8, C9, C13, C14, R2, and R3. When an LCR filter is required, remove C11, C12, and T1, 2 Evaluates: MAX9700A/B/C/D/MAX9712