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19-3413; Rev 0; 9/04
MAX9718A Evaluation Kit
General Description
The MAX9718A evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9718A differential audio amplifier to drive a mono bridge-tied load (BTL) speaker in portable audio applications. Designed to operate from a 2.7VDC to 5.5VDC power supply, the EV kit is capable of delivering 1.1W into an 8 load. The MAX9718A inputs can tolerate a DC offset level of 0.5V through (VCC - 1.2V) from an input 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 are within the range of 0.5V to (VCC - 1.2V). The MAX9718A EV kit also evaluates the MAX9718B, MAX9718C, and MAX9718D.
Features
Drives 1.1W into 8 Speaker at 1% THD+N Differential Input 2.7V to 5.5V Single-Supply Operation 100nA Shutdown Current (typ) Small 10-Pin TDFN Package Also Available in 10-Pin MAX and 9-Bump UCSP Packages Fully Assembled and Tested Evaluates MAX9718B/C/D (IC and Component Replacement Required)
Evaluates: MAX9718A/MAX9718B/MAX9718C/MAX9718D
Ordering Information
PART MAX9718AEVKIT TEMP RANGE 0C to +70C IC PACKAGE 10 TDFN-EP*
Component List
DESIGNATION A1 A2 C1, C2 QTY 0 0 2 DESCRIPTION MAX9718AEUB (10-pin MAX) MAX9718AEBL-T (9-bump UCSP) 0.47F 20%, 16V, film chip capacitors (1206) Panasonic ECPU1C474MA5 1F 10%, 10V X5R ceramic capacitor (0603) TDK C1608X5R1A105K 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M 0.1F 10%, 25V X7R ceramic capacitor (0603) TDK C1608X7R1E104K Not installed, capacitors (0603) 10k 1% resistors (0603) MAX9718AETB (10-pin TDFN) 3-pin headers 2-pin headers Shunts MAX9718A PC board
*EP = Exposed paddle.
Quick Start
The MAX9718A 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.
C3
1
Recommended Equipment
* 2.7V to 5.5V, 2A power supply * Audio signal source * 8 speaker
C4
1
Connection and Setup
1) Verify that a shunt is installed across pins 1 and 2 of jumper JU1 (EV kit on). 2) Verify that a shunt is installed across pins 2 and 3 of jumper JU2 (shutdown mode active low). 3) Verify that no shunts are installed on jumpers JU3 and JU4 (input-signal coupling capacitors are in circuit). 4) Connect the 8 speaker across the OUT+ and OUT- PC board pads. 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 audio source across the INPUT+ and INPUT- pads. 7) Turn on the power supply. 8) Turn on the audio source.
1
C5 C6, C7 R1-R4 U1 JU1, JU2 JU3, JU4 None None
1 0 4 1 2 2 4 1
________________________________________________________________ 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.
MAX9718A Evaluation Kit Evaluates: MAX9718A/MAX9718B/MAX9718C/MAX9718D
Component Suppliers
SUPPLIER Panasonic TDK PHONE 714-373-7366 847-803-6100 FAX 714-737-7323 847-390-4405 WEBSITE www.panasonic.com www.component.tdk.com
Note: Indicate that you are using the MAX9718A when contacting these component suppliers.
Detailed Description
The MAX9718A EV kit features the MAX9718A differential audio amplifier, designed to drive an 8 mono speaker in portable audio applications. The EV kit operates from a DC power supply that can provide 2.7V to 5.5V and 2A of current. The amplifier is capable of delivering 1.1W into an 8 speaker or 1.4W into a 4 speaker. As configured, the EV kit is set for a gain of 1V/V (0dB) by gain-setting resistors R1-R4. 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 C6 and C7 are used for optionally limiting the audio signal bandwidth.
Limiting the Audio Signal Bandwidth
Capacitors C6 and C7 provide the option to implement a lowpass filter (LPF) with the MAX9718A EV kit. The -3dB point of the LPF can be set by component pairs C6 and R2 and C7 and R4 as follows: f-3dB = 1/(2 x x RF x CF) where RF = R2 = R4 and CF = C6 = C7. If a lowpass filter (LPF) is not desired, leave C6 and C7 uninstalled. Bypassing the Input-Signal Coupling Capacitors (JU3 and JU4) Jumpers JU3 and JU4 provide an option to bypass the input-signal coupling capacitors C1 and C2, respectively, on the MAX9718A EV kit. See Table 2 for the various shunt positions.
Jumper Selection
Shutdown Mode (SHDM and SHDN) The MAX9718A features a shutdown mode that reduces the MAX9718A quiescent current to 100nA (typ). The shutdown mode on the MAX9718A EV kit is controlled by the combination of the SHDM and SHDN pins of the MAX9718A IC. The SHDM pin determines whether the SHDN input pin is active high or active low, while the SHDN pin activates or deactivates the shutdown mode of the IC. Jumpers JU1 and JU2 configure the shutdown mode (SHDN and SHDM) of the MAX9718A IC. See Table 1 for the shunt positions.
Table 2. JU3 and JU4 Jumper Selection
SHUNT POSITION Not Installed (default) Installed INPUT-SIGNAL COUPLING CAPACITORS In circuit DC-coupled inputs
Table 1. Shutdown Mode Configuration (JU1 and JU2)
JU2 SHUNT POSITION SHDM (SHUTDOWN MODE) 1-2 (SHDM = high) 1-2 (SHDM = high) 2-3 (SHDM = low) 2-3 (SHDM = low) JU1 SHUNT POSITION SHDN (SHUTDOWN PIN) 1-2 (SHDN = high) 2-3 (SHDN = low) 1-2 (SHDN = high) 2-3 (SHDN = low) EV KIT FUNCTION Disabled Enabled Enabled Disabled
Evaluating the MAX9718B/MAX9718C/MAX9718D The MAX9718A EV kit can also evaluate the MAX9718B, MAX9718C, and MAX9718D. 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.
Note: The SHDM and SHDN pins can also be controlled by external sources connected to the SHDM and SHDN pads. 2 _______________________________________________________________________________________
MAX9718A Evaluation Kit Evaluates: MAX9718A/MAX9718B/MAX9718C/MAX9718D
Table 3. Component Values for Evaluating Different Versions of the MAX9718
COMPONENT U1 R1, R3 R2, R4 EVALUATING MAX9718A MAX9718A 10k 10k EVALUATING MAX9718B MAX9718B 0 Open EVALUATING MAX9718C MAX9718C 0 Open EVALUATING MAX9718D MAX9718D 0 Open
C7 OPEN
R4 10k 1% C6 OPEN
JU3 C1 0.47F R1 10k 1% R3 10k 1%
R2 10k 1%
INPUT-
2
IN-
U1 MAX9718A
OUT+
10
OUT+
INPUT+
C2 0.47F
4
IN+
OUT-
6
OUT-
JU4 C5 0.1F VCC VCC
5
N.C. BIAS
8 VCC
SHDN 9 C3 1F 7 SHDM GND VCC
1 VCC
2
1 JU1 3
SHDN
GND
C4 10F
3
2
1 JU2 3
SHDM
Figure 1. MAX9718A EV Kit Schematic
_______________________________________________________________________________________
3
MAX9718A Evaluation Kit Evaluates: MAX9718A/MAX9718B/MAX9718C/MAX9718D
Figure 2. MAX9718A EV Kit Component Placement Guide-- Component Side
Figure 3. MAX9718A EV Kit PC Board Layout--Component Side
4
_______________________________________________________________________________________
MAX9718A Evaluation Kit Evaluates: MAX9718A/MAX9718B/MAX9718C/MAX9718D
Figure 4. MAX9718A 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 _____________________ 5 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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