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| 19-3427; Rev 0; 10/04 MAX9750A Evaluation Kit General Description The MAX9750A evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX9750A/B/C, MAX9751, and MAX9755. The MAX9750A/B/C, MAX9751, and MAX9755 are class AB amplifiers designed to drive stereo bridge-tied-load (BTL) speakers, and a stereo headphone in portable audio applications. The speaker amplifiers operate from a 4.5VDC to 5.5VDC power supply, and deliver 2 x 1.4W continuous power into a pair of 8 speakers. The headphone amplifiers operate from a 3VDC to 5.5VDC power supply, and deliver 110mW continuous power into a 16 stereo headphone. The MAX9750A/B/C feature an analog volume control and an audible alert input (BEEP). The MAX9750A/B/Cs' gain is jumper selectable. The MAX9751 features a 2:1 multiplexer, allowing two audio sources. The MAX9750A/B/C/ MAX9751/MAX9755 have a low shutdown supply current of 5A. Features 4.5V to 5.5V Single-Supply Operation Drives 2 x 1.4W into a Pair of 8 Speakers Drives 110mW into a 16 Stereo Headphone Analog Volume Control Beep Input with Glitch Filter 5A Shutdown Current Small 28-Pin TQFN Package Fully Assembled and Tested Evaluates MAX9750B/C/MAX9751/MAX9755 (IC Replacement Required) Evaluates: MAX9750A/B/C/MAX9751/MAX9755 Ordering Information PART MAX9750AEVKIT TEMP RANGE 0C to +70C IC PACKAGE 28 TQFN-EP* *EP = Exposed Paddle Component List DESIGNATION QTY C1, C11, C12, C14 4 DESCRIPTION 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M 1000pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H102K 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K DESIGNATION QTY C13, C15 J1 JU1-JU4 JU5 R1 R2 U1 None None 2 1 4 1 1 1 1 5 1 DESCRIPTION 100F 20%, 6.3V X5R ceramic capacitors (1210) TDK C3225X5R0J107M 3.5mm switched stereo jack 3-pin headers 2-pin header 47k 5% resistor (0603) 10k thumb-wheel potentiometer MAX9750AETI (28-pin TQFN-EP, 5mm x 5mm) Shunts MAX9750A PC board C2 1 C3 1 C4-C10, C16 8 Component Suppliers SUPPLIER TDK PHONE 847-803-6100 FAX 847-390-4405 WEBSITE www.component.tdk.com Note: Indicate that you are using the MAX9750AEVKIT when contacting this component supplier. ________________________________________________________________ Maxim Integrated Products 1 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. MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 Quick Start Recommended Equipment * One 5V, 2A power supply * One 3V, 1A power supply * One audio source * Two 8 speakers * One headphone The MAX9750A 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) Verify that a shunt is installed across pins 1 and 2 of jumper JU1 (EV kit ON). 2) Verify that shunts are installed across pins 1 and 2 of jumpers JU2 and JU3 (speaker gain = 13.5dB, headphone gain = 3dB). 3) Verify that a shunt is installed across pins 2 and 3 of jumper JU4 (volume control is selected). 4) Verify that a shunt is installed across jumper JU5 (speaker enable). 5) Connect the first speaker to the OUTL+ and the OUTL- pads. 6) Connect the second speaker to the OUTR+ and the OUTR- pads. 7) Connect the +5V power supply to the VDD pad. Connect the ground terminal of the power supply to the GND pad. 8) Connect the +3V power supply to the HPVDD pad. Connect the ground terminal of the power supply to the GND pad. 9) Connect the audio source to the IN_L and the IN_R pads. Connect the ground from the audio source to the GND pad. 10) Turn on both power supplies and the audio source. 11) Adjust potentiometer R2 to change the speakers' volume. 12) Connect the headphone to the phone jack J1. 13) Adjust potentiometer R2 to adjust the headphone's volume. Detailed Description The MAX9750A EV kit is designed to evaluate the MAX9750A/B/C, MAX9751, and MAX9755. The MAX9750A/B/C, MAX9751, and MAX9755 are class AB amplifiers that drive stereo BTL speakers, and stereo headphones in portable audio applications. The speaker amplifiers operate from a 4.5VDC to 5.5VDC power supply, and deliver 2 x 1.4W continuous power into a pair of 8 speakers. The headphone amplifiers operate from a 3VDC to 5.5VDC power supply, and deliver 110mW continuous power into 16 stereo headphones. The EV kit can be powered by a 4.5VDC to 5.5VDC single power supply. The EV kit comes with the MAX9750A installed. The volume of the speakers and the headphone are adjustable by the thumb-wheel potentiometer (R2) connected to the analog volume control (VOL). The maximum gain of the MAX9750A is selectable by jumpers JU2 and JU3. The MAX9750A also features an audible alert input (PC_BEEP). The EV kit can also evaluate the MAX9750B, MAX9750C, MAX9751, and MAX9755. To evaluate the MAX9750B or MAX9750C, replace the MAX9750A with the desired IC. To evaluate the MAX9751 or the MAX9755, see the Evaluating the MAX9751 or the Evaluating the MAX9755 sections in this data sheet for additional information. The speaker and headphone outputs on the EV kit can be selected by jumper JU5 and the headphone jack J1. See Table 4 in the Jumper Selection section. Jumper Selection Shutdown Mode (SHDN) Jumper JU1 controls the shutdown pin (SHDN) of the MAX9750A/B/C, MAX9751, and MAX9755 ICs. See Table 1 for shunt positions. Table 1. JU1 Jumper Selection SHUNT POSITION 1-2 2-3 None SHDN PIN High Low EV KIT FUNCTION Enabled Disabled Connected to SHDN driven by external external controller, shutdown is controller active low 2 _______________________________________________________________________________________ MAX9750A Evaluation Kit Gain Selection (MAX9750A/B/C) For the MAX9750A/B/C, jumpers JU2 and JU3 provide an option to set the maximum gain of the speakers and headphone amplifiers on the EV kit. See Table 2 for shunt positions. Analog Volume Control (MAX9750A/B/C) Jumper JU4 selects between the analog volume control (VOL) for the MAX9750A/B/C or the right input channel for the MAX9751/MAX9755. See Table 3 for shunt positions. Speaker/Headphone Mode (HPS) Jumper JU5 selects between the speaker mode and the headphone mode for the MAX9750A/B/C, MAX9751, and MAX9755 ICs. See Table 4 for shunt positions. Evaluating the MAX9751 To evaluate the MAX9751, replace the MAX9750A with the MAX9751. The MAX9751 features a 2:1 multiplexer, allowing two sets of audio sources to be connected to the inputs of the MAX9751. The first set of audio input signals are connected to the IN_L and IN_R pads (same as the MAX9750A), while the second set of audio signals are connected to the PC_BEEP (left channel) and INRB (right channel) pads. To utilize the PC_BEEP and INRB pads for the second set of audio input signals, replace R1 with a 0 resistor and install shunts on pins 1 and 2 of jumper JU4. The two sets of audio sources are selectable by jumper JU3. The gain for the speaker and headphone amplifiers is set by jumper JU2. Refer to the MAX9751 IC data sheet for the correct pinout and function. The speaker and headphone outputs on the EV kit can be selected by jumper JU5 and headphone jack J1. See Table 4 in the Jumper Selection section. MAX9751 Gain Selection When evaluating the MAX9751, jumper JU2 provides an option to set the gain of the speakers and headphone amplifiers of the EV kit. See Table 5 for shunt positions. Evaluates: MAX9750A/B/C/MAX9751/MAX9755 Table 2. JU2 and JU3 Jumper Selection SHUNT POSITION JU3 (GAIN2) 2-3 (low) 2-3 (low) 1-2 (high) 1-2 (high) JU2 (GAIN1) 2-3 (low) 1-2 (high) 2-3 (low) 1-2 (high) MAX9750A 9 10.5 12 13.5 SPEAKER MODE GAIN, JU5 NOT INSTALLED (dB) MAX9750B 15 16.5 18 19.5 MAX9750C 6 7.5 9 10.5 HEADPHONE MODE GAIN, JU5 INSTALLED (dB) MAX9750A/B/C 0 0 3 3 Table 3. JU4 Jumper Selection SHUNT POSITION MAX9750A/B/C, Pin 28 (VOL) Not allowed when evaluating the MAX9750A/B/C Connected to the thumb-wheel potentiometer R2 EV KIT FUNCTION See Evaluating the MAX9751 or Evaluating the MAX9755 section MAX9750A/B/C's analog volume control is selected Table 4. JU5 Jumper Selection SHUNT POSITION None Installed (No headphone plugged into J1) Installed (Headphone plugged into J1) EV KIT FUNCTION Forced headphone mode Speaker mode Headphone mode 1-2 2-3 Table 5. JU2 Jumper Selection SHUNT POSITION 1-2 2-3 MAX9751 PIN 24 (GAIN) Connected to VDD Connected to GND SPEAKER MODE GAIN, JU5 INSTALLED (dB) 9 10.5 HEADPHONE MODE GAIN, JU5 NOT INSTALLED (dB) 0 3 _______________________________________________________________________________________ 3 MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 Table 6. JU3 Jumper Selection SHUNT POSITION 1-2 2-3 MAX9751 PIN 23 (IN1/2) Connected to VDD Connected to GND STEREO INPUT SOURCE SELECTED The stereo source that is connected to the IN_L and IN_R pads is selected The stereo source that is connected to the PC_BEEP and INRB pads* is selected *Replace R1 with a 0 resistor, and install shunts on pins 1 and 2 of jumper JU4. MAX9751 Stereo Input Selection When evaluating the MAX9751, jumper JU3 provides an option to select between two stereo input sources. See Table 6 for shunt positions. MAX9751 Second Right Input Channel (INR2) Jumper JU4 selects between the analog volume control (VOL) for the MAX9750A/B/C or the second right input channel (INR2) for the MAX9751. See Table 7 for shunt positions. Evaluating the MAX9755 To evaluate the MAX9755, replace the MAX9750A with the MAX9755. The MAX9755's audio input signals INL and INR are connected to the PC_BEEP and INRB pads on the EV kit, respectively. To utilize the PC_BEEP and INRB pads for audio input signals, replace resistor R1 with a 0 resistor and install a shunt on pins 1 and 2 of jumper JU4. Install a shunt on pins 2 and 3 of jumper JU3. The speaker and headphone amplifier gains are set by jumper JU2. Refer to the MAX9755 IC data sheet for the correct pinout. The speaker and headphone outputs on the EV kit can be selected by jumper JU5 and the headphone jack J1. See Table 4 in the Jumper Selection section. MAX9755 Gain Selection When evaluating the MAX9755, jumper JU2 provides an option to set the gain of the speakers and headphone amplifiers of the EV kit. See Table 8 for shunt positions. MAX9755 Jumper JU3 When evaluating the MAX9755, install a shunt across pins 2 and 3 on jumper JU3 (see Table 9). MAX9755 Right Input Channel (INR) Jumper JU4 selects between the analog volume control (VOL) for the MAX9750A/B/C or the right input channel (INR) for the MAX9755. See Table 10 for shunt positions. Table 7. JU4 Jumper Selection SHUNT POSITION MAX9751 PIN 28 (INR2) AC coupled to the INRB pad on the EV kit Not allowed when evaluating the MAX9751 EV KIT FUNCTION MAX9751's second right input channel is selected See the Jumper Selection section 1-2 2-3 Table 8. JU2 Jumper Selection SHUNT POSITION 1-2 2-3 MAX9755 PIN 24 (GAIN) Connected to VDD Connected to GND SPEAKER MODE GAIN, JU5 INSTALLED (dB) 9 10.5 HEADPHONE MODE GAIN, JU5 NOT INSTALLED (dB) 0 3 Table 9. JU3 Jumper Selection SHUNT POSITION 1-2 (not allowed) 2-3 (required) MAX9755 PIN 23 (GND) Connected to VDD (not allowed) Connected to GND EV KIT FUNCTION Not functional Normal operation Table 10. JU4 Jumper Selection SHUNT POSITION 1-2 MAX9755 PIN 28 (INR) AC coupled to the INRB pad on the EV kit Not allowed when evaluating the MAX9755 EV KIT FUNCTION MAX9755`s right input channel is selected See the Jumper Selection section 2-3 4 _______________________________________________________________________________________ MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 VDD VDD GND HPVDD C2 10F C4 1F C3 1000pF HPVDD C1 0.1F 25 VDD HPOUTR HPS HPOUTL U1 13 20 HPOUTR 4 3 2 1 J1 26 GND 9 CPGND 15 HPVDD JU5 HPOUTL 14 IN_L C6 1F C7 1F C5 1F 7 CPVDD MAX9750A 4 21 OUTL+ BIAS 1 OUTLINL OUTR+ INR OUTR2 8 BEEP C1P PVDD C1N VOL PGND PVDD GAIN2 PGND GAIN1 SHDN CPVSS VSS 19 11 12 C16 1F 3 16 C14 0.1F C15 100F 6 C12 0.1F VDD C13 100F 17 VDD 18 5 OUTL+ OUTLOUTR+ OUTR- IN_R C8 1F C9 1F 27 R1 47k PC_BEEP INRB C10 1F 1 JU4 2 3 C11 0.1F 10 28 HPVDD VDD 1 JU3 2 VDD 3 1 JU2 2 3 23 R2 VDD SHDN 1 2 3 JU1 24 22 Figure 1. MAX9750A EV Kit Schematic _______________________________________________________________________________________ 5 MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 VDD VDD GND HPVDD C2 10F C4 1F C3 1000pF HPVDD C1 0.1F 25 VDD HPOUTR HPS HPOUTL U1 13 20 HPOUTR 4 3 2 1 J1 26 GND 9 CPGND 15 HPVDD JU5 HPOUTL 14 IN_L C6 1F C7 1F C5 1F 7 CPVDD MAX9751 4 21 OUTL+ BIAS 1 OUTLINL1 OUTR+ 27 INR1 OUTR2 8 INL2 C1P PVDD 6 C12 0.1F VDD 16 C14 0.1F C15 100F C13 100F 17 VDD 18 5 OUTL+ OUTLOUTR+ OUTR- IN_R C8 1F C9 1F 1 JU4 2 3 PC_BEEP R1* 0 INRB HPVDD C10 1F VDD 1 JU3 2 VDD 3 1 2 JU2 3 JU1 10 C1N 28 INR2 PGND PVDD 3 R2 C11 0.1F VDD 23 IN1/2 PGND GAIN SHDN CPVSS VSS 19 11 12 24 22 SHDN 1 2 3 C16 1F *See the Evaluating the MAX9751 section. Figure 2. Application Circuit for MAX9751 6 _______________________________________________________________________________________ MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 VDD VDD GND HPVDD C2 10F C4 1F C3 1000pF HPVDD C1 0.1F 25 VDD HPOUTR HPS HPOUTL U1 13 20 HPOUTR 4 3 2 1 J1 26 GND 9 CPGND 15 HPVDD JU5 HPOUTL 14 IN_L C6 1F C7 1F C5 1F 7 CPVDD MAX9755 4 21 OUTL+ BIAS 1 OUTLN.C. OUTR+ 27 N.C. OUTR2 INL 8 C1P 10 28 C1N INR PGND PVDD GND PGND GAIN SHDN CPVSS VSS 19 11 12 C16 1F 17 VDD PVDD 6 C12 0.1F VDD 16 C14 0.1F C15 100F C13 100F 18 5 OUTL+ OUTLOUTR+ OUTR- IN_R C8 1F C9 1F 1 JU4 2 3 PC_BEEP R1* 0 INRB HPVDD C10 1F VDD 1 JU3 2 VDD 3 1 2 JU2 3 JU1 3 R2 C11 0.1F VDD 23 24 22 SHDN 1 2 3 *See the Evaluating the MAX9755 section. Figure 3. Application Circuit for MAX9755 _______________________________________________________________________________________ 7 MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 Figure 4. MAX9750A EV Kit Component Placement Guide-- Component Side Figure 5. MAX9750A EV Kit PC Board Layout--Component Side Figure 6. MAX9750A EV Kit PC Board Layout--GND Layer 2 8 _______________________________________________________________________________________ MAX9750A Evaluation Kit Evaluates: MAX9750A/B/C/MAX9751/MAX9755 Figure 7. MAX9750A EV Kit PC Board Layout--VDD Layer 3 Figure 8. MAX9750A 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 _____________________ 9 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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