19-3742; Rev 0; 9/05 MAX9706 Evaluation Kit Features The MAX9706 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX9706 as well as the MAX9707 ICs. The MAX9706/MAX9707 contain three Class D amplifiers with an internal active crossover to provide stereo highpass outputs and a mono lowpass output. The IC does not require any external components for the active crossover filter. The MAX9706 also features a DirectDriveTM stereo headphone amplifier. 4.5V to 5.5V Single DC Power-Supply Operation The MAX9706 speaker amplifier operates from a 4.5V to 5.5V DC power supply, and delivers 2.3W continuous power into each of three 4 speakers. Three different speaker output filtering options are available for ease of evaluation (see the Output Filtering section). Selectable Gains The MAX9706 headphone amplifier operates from a 3V to 5.5V DC power supply, and delivers up to 95mW per channel into a 16 stereo headphone. When the MAX9706 headphone sense detects the insertion of a headphone, the MAX9706 automatically enters the headphone mode. 0.5A (typ) Shutdown Current The EV kit offers an option to select between fixed-frequency modulation (FFM) mode or spread-spectrum modulation (SSM) mode. The EV kit can be synchronized with an external clock, and the EV kit provides a synchronization output that allows multiple units to be cascaded in a system. The MAX9706 EV kit gain is jumper selectable. The EV kit also features an option to select the crossover frequency between the stereo highpass outputs and the mono lowpass output. The MAX9706 shutdown supply current is only 0.5A (typ). Drives 3 x 2.3W into Three 4 Speakers (2.1 Speaker Solutions) Drives 2 x 95mW into a 16 Stereo Headphone (MAX9706) Internal Active Crossover Filter with Selectable Crossover Frequency Selectable Between Spread-Spectrum and FixedFrequency Modulation Input and Output Synchronization Signals Space-Saving 36-Pin TQFN (6mm x 6mm x 0.8mm) Package Fully Assembled and Tested Evaluates MAX9707 (IC Replacement Required) Ordering Information PART MAX9706EVKIT TEMP RANGE IC PACKAGE 0C to +70C* 36-TQFN-EP** (6mm x 6mm x 0.8mm) *This limited temperature range is for the EV kit PC board only. The MAX9706 IC temperature range is -40C to +85C. **EP = Exposed paddle. Component List DESIGNATION C3, C5 C4, C6, C7, C10, C12, C13, C14 C8, C9, C11 U1 QTY 2 7 DESCRIPTION 0.1F 10%, 10V X7R ceramic capacitors (0402) TDK C1005X7R1A104K 1F 10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A105K 3 0.47F 10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A474K 1 MAX9706ETX (36-pin TQFN-EP, 6mm x 6mm) DESIGNATION QTY DESCRIPTION OPTIONAL COMPONENTS FOR CUSTOMER EVALUATION C1, C36 2 1000pF 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H102K C2 1 100F 20%, 6.3V X5R ceramic capacitor (1210) TDK C3225X5R0J107M C15-C35 0 Not installed, capacitors (0603) C37, C38 2 100pF 10%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H101K System-level requirement. Component List continued on next page. ________________________________________________________________ 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: MAX9706/MAX9707 General Description Evaluates: MAX9706/MAX9707 MAX9706 Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION OPTIONAL COMPONENTS FOR CUSTOMER EVALUATION J1 1 3.5mm switched stereo jack JU1-JU7 7 3-pin headers JU8 1 2-pin header 1 Ferrite bead, 30 at 100MHz, 10m DCR, 5A (0805) TDK MPZ2012S300A L1 L2, L3, L10 Ferrite beads, 100 at 100MHz, 50m DCR, 3A (0603) TDK MPZ1608S101A 3 DESIGNATION QTY DESCRIPTION OPTIONAL COMPONENTS FOR CUSTOMER EVALUATION L4-L9 0 R1-R6 0 Not installed, inductors Sumida CDRH6D38 series recommended Not installed, resistors (0603) -- 8 Not installed, common-mode chokes 50VDC, 1.5ADC, 600 at 100MHz TDK ACM4532-601-2P-X recommended Shunts -- 1 MAX9706 EV kit PC board T1, T2, T3 0 Component Suppliers PHONE FAX Sumida USA SUPPLIER 847-545-6700 847-545-6720 www.sumida.com WEBSITE TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Indicate that you are using the MAX9706 EV kit when contacting these component suppliers. Quick Start Recommended Equipment * One 5V, 2A DC power supply * Optional 3V, 1A DC power supply * Audio source * Three 4 to 8 speakers * Stereo headphone 8) Connect the second speaker to the OUTR+ and the OUTR- test points. 9) Connect the third speaker to the OUTM+ and the OUTM- test points. 10) Connect the +5V DC power supply to the VDD pad. Connect the power-supply ground to the GND pad. Procedures The MAX9706 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. 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 (mono speaker gain offset = -7.5dB). 3) Install a shunt across pins 1 and 2 of jumpers JU3 and JU4 (stereo speaker gain = +13.5dB, mono speaker gain = +12dB, headphone gain = +3dB). 4) Install a shunt across pins 1 and 2 of jumpers JU5 and JU6 (crossover frequency = 2133.3Hz). 5) Install a shunt across pins 1 and 2 of jumper JU7 (SSM mode with frequency = 1150kHz 50kHz). 6) Install a shunt on jumper JU8 (speaker enable). 2 7) Connect the first speaker to the OUTL+ and the OUTL- test points. 11) Connect the +3V DC power supply to the HPVDD pad. Connect the power-supply ground to the GND pad. If the optional +3V DC power supply is not available, connect the HPVDD pad to the VDD pad. 12) Connect the audio source to the IN_L and the IN_R pads. Connect the audio source ground to the GND pad. 13) Turn on both power supplies and the audio source. 14) To test the headphone, plug the headphone to the phone jack J1. Detailed Description The MAX9706 EV kit is designed to evaluate the MAX9706 as well as the MAX9707 ICs. The MAX9706/ MAX9707 contain three Class D amplifiers with an internal active crossover to provide stereo highpass outputs and a mono lowpass output. The MAX9706 also features a DirectDrive stereo headphone amplifier. The EV kit comes with the MAX9706 IC installed. ____________________________________________________________________________________________________ MAX9706 Evaluation Kit The MAX9706 EV kit features an option to select the crossover frequency between the stereo highpass and mono lowpass frequencies. The crossover frequency is jumper selectable using jumpers JU5 and JU6. Refer to Table 1. Suggested Filtering Components for a 4 Load with a 30kHz Cutoff Frequency COMPONENT DESCRIPTION the Crossover Frequency section in the MAX9706/ MAX9707 IC data sheet for additional information on the internal active crossover. The speaker and headphone outputs on the EV kit can be selected by jumper JU8 and headphone jack J1. See Table 8 in the Jumper Selection section. The EV kit can also evaluate the MAX9707. To evaluate the MAX9707, replace the MAX9706 with the MAX9707. See the Evaluating the MAX9707 section. Output Filtering The speaker outputs (OUTL+/-, OUTR+/-, and OUTM+/-) can be connected directly to three speaker loads without any filtering. Use the OUTL+/-, OUTR+/-, and OUTM+/test points to connect the left, right, and mono speakers directly to the EV kit. The MAX9706 EV kit features PC board pads for filters that can be added to ease evaluation. Audio analyzers typically cannot accept pulse-width-modulated (PWM) signals at their inputs. The PWM output signal can be lowpass-filtered by installing components: L4-L9, C21-C35, and R1-R6 to use the filtering output pads (FOUTL+/-, FOUTR+/-, and FOUTM+/-). See Table 1 for the suggested filtering component values to evaluate a 4 load with a 30kHz cutoff frequency. The MAX9706/MAX9707 are designed to pass FCC Class B RF emissions without additional filtering. In applications where a long cable is required, or the circuit is near EMI-sensitive devices, output capacitors C15-C20, and common-mode chokes T1-T3, can be added to reduce radiated emissions. Table 2 lists the recommended EMI filter components. Refer to the Applications Information, Filterless Class D Operation section in the MAX9706/MAX9707 IC data sheet for additional information. Table 2. Recommended EMI Filter Components C21-C26 0.033F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E333K C27, C28, C29 0.15F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E154K C15-C20 100pF 10%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H101K C30-C35 0.068F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E683K T1, T2, T3 Common-mode chokes, 50VDC, 1.5ADC, 600 at 100MHz TDK ACM4532-601-2P-X L4-L9 22H 20%, 1.3A inductors Sumida CDRH6D38-220 R1-R6 22 5% resistors (0603) COMPONENT DESCRIPTION _______________________________________________________________________________________ 3 Evaluates: MAX9706/MAX9707 The EV kit's speaker amplifiers operate from a 4.5V to 5.5V DC power supply, and deliver 3 x 2.3W continuous power into three 4 speakers. Three different speaker output filtering options are available for ease of evaluation. See the Output Filtering section. The EV kit's DirectDrive headphone amplifier operates from a 3V to 5.5V DC power supply, and delivers 95mW per channel into a 16 stereo headphone. Both the speaker and headphone power supplies must be present to operate the EV kit. The EV kit can be powered by a single 4.5V to 5.5V DC power supply. The EV kit offers an option to select between two frequencies when in fixed-frequency modulation (FFM) mode or a single-center frequency in spread-spectrum modulation (SSM) mode. The MAX9706 EV kit features a synchronization input (SYNCIN) PC board pad that allows the MAX9706 to synchronize with an external clock. The EV kit also provides a synchronization output (SYNCOUT) PC board pad to synchronize other devices to the MAX9706. Refer to the Operating Modes section in the MAX9706/ MAX9707 IC data sheet for additional information on FFM, SSM, SYNCIN, and SYNCOUT. The MAX9706's speaker and headphone amplifier gain is configurable using jumpers JU3 and JU4. The mono output gain offset is configurable using jumper JU2. The MAX9706 EV kit also provides a line-level monooutput MONO_OUT PC board pad. Evaluates: MAX9706/MAX9707 MAX9706 Evaluation Kit Jumper Selection Shutdown Mode (SHDN) Jumper JU1 controls the shutdown mode (SHDN) of the MAX9706/MAX9707 ICs. The shutdown mode can also be controlled by an external logic controller connected to the EV kit SHDN PC board pad. Remove the shunt from jumper JU1 before connecting an external controller to the SHDN PC board pad. See Table 3 for shunt positions. Mono Gain Offset Selection (MGAIN) The MAX9706/MAX9707's mono channel is the sum of the left and right channels. Therefore, the mono channel has a +6dB gain higher than that of the left or the right channels. The MAX9706/MAX9707 provides an option to offset this +6dB gain. Jumper JU2 selects the mono amplifier gain offset on the EV kit. See Table 4 for shunt positions. Gain Selection (GAIN1, GAIN2) Jumpers JU3 and JU4 provide an option to set the speaker and headphone amplifiers' gain on the EV kit. SHDN PIN EV KIT FUNCTION Synchronous Switching Input (SYNCIN) The MAX9706 EV kit provides a SYNCIN PC board pad that allows the MAX9706/MAX9707 switching frequency to synchronize to an external TTL clock. The external clock frequency can range from 1MHz to 1.5MHz and can have any duty cycle, but the minimum pulse width must be greater than 100ns. The SYNCIN input on the EV kit also selects between the FFM and SSM mode for the MAX9706. Jumper JU7 selects between the FFM and SSM mode options for the MAX9706/MAX9707 ICs. See Table 7 for shunt positions. SHUNT POSITION 1-2 (Default) High 2-3 Low Disabled Connected to external controller. SHDN driven by external logic controller. Shutdown is active low. None. External logic controller connected to SHDN pad. Crossover Frequency Selection (FS0, FS1) Jumpers JU5 and JU6 provide an option to set the crossover frequency between stereo highpass outputs and the mono lowpass output for the MAX9706 EV kit. See Table 6 for shunt positions. Table 4. JU2 Jumper Selection (MGAIN Offset) Table 3. JU1 Jumper Selection (SHDN) SHUNT POSITION See Table 5 for shunt positions. Note that the stereo speaker outputs are highpass-filtered by the crossover circuitry. The mono speaker output is lowpass-filtered by the crossover circuitry while the stereo headphone output has full bandwidth. Enabled MONO AMPLIFIER GAIN OFFSET (dB) MGAIN PIN 1-2* High -7.5 Not Installed* Unconnected -6.0 2-3* Low -4.5 *JU8 installed. Headphone not plugged in. Table 5. JU3 and JU4 Jumper Selection (GAIN) SHUNT POSITION 4 SPEAKER GAIN (dB) JU8 INSTALLED JU2 NOT INSTALLED HEADPHONE GAIN (dB) JU8 NOT INSTALLED 0 JU3 (GAIN2) JU4 (GAIN1) 2-3 (Low) 2-3 (Low) +9.0 2-3 (Low) 1-2 (High) +10.5 0 1-2 (High) 2-3 (Low) +12.0 +3 1-2 (High) 1-2 (High) +13.5 +3 _______________________________________________________________________________________ MAX9706 Evaluation Kit Table 6. JU5 and JU6 Jumper Selection (Crossover Frequency) SHUNT POSITION JU5 (FS0) JU6 (FS1) CROSSOVER FREQUENCY (Hz) 2-3 (Low) 2-3 (Low) 800 2-3 (Low) 1-2 (High) 1066.7 1-2 (High) 2-3 (Low) 1600 1-2 (High) 1-2 (High) 2133.3 Evaluating the MAX9707 To evaluate the MAX9707, replace the MAX9706 IC with the MAX9707 IC. Refer to the MAX9706/MAX9707 IC data sheet for the pinout and function. Table 8. JU8 Jumper Selection (SPKR/HP) SHUNT POSITION EV KIT FUNCTION Not Installed Forced headphone mode Installed (No headphone plugged into J1) Speaker mode Installed (Headphone plugged into J1) Headphone mode Table 7. JU7 Jumper Selection (Switching Frequency) SHUNT POSITION SYNC_IN CONNECTED TO OPERATING MODE 1-2 (Default) VDD SSM with fOSC = 1150kHz 50kHz Not Installed Unconnected FFM with fOSC = 1340kHz 2-3 GND FFM with fOSC = 1100kHz Not Installed. External clock source connected to SYNCIN pad. External clock source from 1MHz to 1.5MHz. FFM with fOSC = external clock frequency. _______________________________________________________________________________________ 5 Evaluates: MAX9706/MAX9707 Speaker/Headphone Mode (HPS) Jumper JU8 selects between the speaker mode and the headphone mode for the MAX9706 EV kit. See Table 8 for shunt positions. Evaluates: MAX9706/MAX9707 MAX9706 Evaluation Kit VDD 3 C3 0.1F 2 1 C4 1F VDD HPR GND HPS BIAS HPL 17 J1 4 3 2 1 15 18 SGND SGND 19 HPVDD C5 0.1F U1 9 C6 1F 13 16 C7 1F 11 MAX97O6 CPVDD CPVSS VSS CPGND OUTL+ INL OUTL- INR OUTR+ C1P OUTR- C1N OUTM+ SHDN OUTM- C8 0.47F 36 LEFT-CHANNEL AUDIO INPUT 7 6 C9 0.47F 27 RIGHT-CHANNEL AUDIO INPUT 10 21 22 C10 1F 12 VDD 24 33 32 C11 0.47F 28 MGAIN MONO_OUT 29 GAIN2 PVDD 30 GAIN1 25 FS0 26 14 4 PGND PVDD FS1 PGND SYNC_IN PVDD SYNC_OUT PGND 35 8 5 VDD C12 1F VDD 20 C13 1F 23 34 31 VDD C14 1F Figure 1. MAX9706 Customer Design Schematic 6 _______________________________________________________________________________________ MAX9706 Evaluation Kit Evaluates: MAX9706/MAX9707 HPR HPR HPS GND VDD L1 FERRITE VDD HPL 3 C2 100F C1 1000pF C3 0.1F 2 SGND 1 C4 1F L10 FERRITE HPVDD SGND C6 1F 13 16 C7 1F 11 18 FOUTL+ L4 OPEN SGND VDD GND OUTL+ 7 OUTL+ BIAS HPVDD OUTL- 2 T1 OPEN TOUTL+ 3 C15 OPEN C16 4 OPEN 1 6 TOUTL- MAX97O6 CPGND OUTR+ 21 OUTR+ 36 OUTROUTR- 27 1 T2 OPEN TOUTR+ 4 C17 OPEN C18 3 OPEN 2 22 TOUTR- 10 VDD SHDN 1 2 C10 1F JU1 12 24 3 VDD VDD 1 JU2 2 3 1 JU3 2 3 VDD 33 C1N OUTM+ 2 MGAIN VDD SYNCIN 1 JU5 2 3 VDD VDD 1 JU6 2 3 OUTM- 1 2 32 GAIN1 25 FS0 JU7 PGND 14 FS1 PVDD SYNC_IN PGND 3 PVDD SYNCOUT 4 SYNC_OUT PGND 5 FOUTR+ C23 OPEN C32 C28 OPEN OPEN R3 OPEN C24 OPEN C33 OPEN R4 OPEN FOUTM+ C34 C29 OPEN OPEN R5 OPEN FOUTM- MONO_OUT L9 OPEN C26 OPEN R6 OPEN C35 OPEN C12 1F VDD C13 1F 23 31 C19 OPEN C25 OPEN VDD 20 34 3 TOUTM- 35 8 TOUTM+ C20 4 OPEN 1 C11 0.47F PVDD 26 T3 OPEN OUTM+ SHDN MONO_OUT 30 FOUTL- L8 OPEN 29 GAIN2 1 JU4 2 3 R2 OPEN C1P OUTM28 C31 OPEN L7 OPEN INR C38 100pF SGND R1 OPEN FOUTRINL C9 0.47F SGND C22 OPEN C30 C27 OPEN OPEN L6 OPEN U1 CPVSS VSS C21 OPEN L5 OPEN CPVDD C8 0.47F L2 FERRITE C37 100pF IN_R 1 2 C5 0.1F 9 L3 FERRITE HPL J1 4 3 2 1 JU8 15 OUTL19 C36 1000pF IN_L 17 VDD C14 1F Figure 2. MAX9706 EV Kit Schematic _______________________________________________________________________________________ 7 Evaluates: MAX9706/MAX9707 MAX9706 Evaluation Kit Figure 3. MAX9706 EV Kit Component Placement Guide--Component Side 8 _______________________________________________________________________________________ MAX9706 Evaluation Kit Evaluates: MAX9706/MAX9707 Figure 4. MAX9706 EV Kit PC Board Layout--Component Side _______________________________________________________________________________________ 9 Evaluates: MAX9706/MAX9707 MAX9706 Evaluation Kit Figure 5. MAX9706 EV Kit PC Board Layout--GND Layer 2 10 ______________________________________________________________________________________ MAX9706 Evaluation Kit Evaluates: MAX9706/MAX9707 Figure 6. MAX9706 EV Kit PC Board Layout--VDD Layer 3 ______________________________________________________________________________________ 11 Evaluates: MAX9706/MAX9707 MAX9706 Evaluation Kit Figure 7. MAX9706 EV Kit PC Board Layout--Solder Side 12 ______________________________________________________________________________________ MAX9706 Evaluation Kit Evaluates: MAX9706/MAX9707 Figure 8. MAX9706 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 ____________________ 13 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX98306EVKIT#