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19-3370; Rev 0; 7/04
MAX9719A Evaluation Kit
General Description
The MAX9719A evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9719A stereo, differential audio amplifier to drive a pair of bridge-tiedload (BTL) speakers in portable audio applications. Designed to operate from a 2.7V to 5.5V DC power supply, the EV kit is capable of delivering 2 x 1.1W into a pair of 8 speakers. The MAX9719A inputs can accept a common-mode input voltage of 0.5V through (VCC - 1.2V) from a DC-coupled 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 is within an acceptable range. The MAX9719A EV kit also evaluates the MAX9719B, MAX9719C, and MAX9719D.
Features
o Also Evaluates the MAX9719B/C/D (IC and Component Replacement Required) o 2.7V to 5.5V Single-Supply Operation o Drives 2 x 1.1W Into Stereo 8 Speakers at 1% THD+N o Differential Inputs o 100nA Shutdown Current (typ) o Small 16-Pin TQFN (4mm x 4mm) Package o Also Available in 16-Bump UCSP and 16-Pin TSSOP-EP Packages o Fully Assembled and Tested
Evaluates: MAX9719A/B/C/D
Component List
DESIGNATION A1 C1-C4 QTY 0 4 DESCRIPTION MAX9719AEBE (16-pin UCSP) 0.47F 20%, 16V film chip capacitors (1206) Panasonic ECPU1C474MA5 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K 0.1F 10%, 25V X7R ceramic capacitor (0603) TDK C1608X7R1E104K Not installed, capacitors (0603) 10k 1% resistors (0603) MAX9719AETE (16-pin TQFN) 2-pin headers 3-pin header Shunts MAX9719A PC board PART MAX9719AEVKIT
Ordering Information
TEMP RANGE 0C to +70C IC PACKAGE 16-TQFN-EP* (4mm x 4mm)
*EP = Exposed paddle.
Quick Start
The MAX9719A 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.
C5
1
C6, C7
2
Recommended Equipment
* * * 1) 2.7V to 5.5V, 3A power supply Audio signal source with stereo outputs Two 8 speakers Verify that no shunts are installed on jumpers JU1-JU4 (input-signal coupling capacitors are in circuit). 2) Verify that a shunt is installed across pins 1 and 2 of jumper JU5 (EV kit ON). 3) Connect the first 8 speaker across the OUTR+ and OUTR- PC board pads. 4) Connect the second 8 speaker across the OUTL+ and OUTL- PC board pads.
C8 C9-C12 R1-R8 U1 JU1-JU4 JU5 None None
1 0 8 1 4 1 5 1
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 MAX9719AEVKIT when contacting these component suppliers. ________________________________________________________________ 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.
MAX9719A Evaluation Kit Evaluates: MAX9719A/B/C/D
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 first output of the stereo audio source across the INPUTR+ and INPUTR- pads. 7) Connect the second output of the stereo audio source across the INPUTL+ and INPUTL- pads. 8) Turn on the power supply. 9) Turn on the audio source.
Table 1. JU5 Jumper Selection
SHUNT POSITION 1-2 (SHDN = high) 2-3 (SHDN = low) None. External logic connected to SHDN pad. EV KIT FUNCTION EV kit enabled Shutdown mode SHDN driven by external logic. Shutdown is active low.
Detailed Description
The MAX9719A EV kit features the MAX9719A stereo differential audio amplifier, designed to drive a pair of 8 speakers in portable audio applications. The EV kit operates from a DC power supply that can provide 2.7V to 5.5V and 3A of current. As configured, the EV kit is set for a gain of 1V/V (0dB) by gain-setting resistors R1-R8. 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 C9-C12 are used for optionally limiting the audio signal bandwidth.
Bypassing the Input-Signal Coupling Capacitors (C1-C4) Jumpers JU1-JU4 provide an option to bypass the input-signal coupling capacitors C1-C4, respectively, on the MAX9719A EV kit. See Table 2 for the various shunt positions. Refer to the Input Filter section of the MAX9718/MAX9719 data sheet
Table 2. JU1-JU4 Jumper Selection
SHUNT POSITION Not Installed (default) Installed INPUT-SIGNAL COUPLING CAPACITORS In circuit DC-coupled inputs
Jumper Selection
Shutdown Mode (SHDN) The MAX9719A features a shutdown mode that reduces the MAX9719A quiescent current to 100nA (typ). Jumper JU5 controls the shutdown pin (SHDN) of the MAX9719A IC. See Table 1 for shunt positions.
Evaluating MAX9719B/MAX9719C/MAX9719D The MAX9719A EV kit can evaluate the MAX9719B, MAX9719C, and MAX9719D. 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.
Table 3. Component Values for Evaluating Different Versions of the MAX9719
COMPONENT U1 R1, R3, R5, R7 R2, R4, R6, R8 EVALUATING THE MAX9719A MAX9719A 10k 10k EVALUATING THE MAX9719B MAX9719B 0 OPEN EVALUATING THE MAX9719C MAX9719C 0 OPEN EVALUATING THE MAX9719D MAX9719D 0 OPEN
2
_______________________________________________________________________________________
MAX9719A Evaluation Kit Evaluates: MAX9719A/B/C/D
C10 OPEN
R4 10k 1% GND C9 OPEN
JU1 C1 0.47F R1 10k 1% R3 10k 1% VCC
R2 10k 1%
INPUTL-
3
INL-
OUTL+
7
OUTL+
INPUTL+
C2 0.47F
4 13 8 14
INL+ N.C. VCC VCC GND GND GND
OUTL-
10
OUTL-
JU2 VCC
U1 MAX9719A
BIAS
5 C8 0.1F VCC 1 2 JU5 3 SHDN
C5 10F GND JU3
C6 1F
C7 1F
11 6 1
SHDN
9
INPUTR-
C3 0.47F
R5 10k 1% R7 10k 1%
16
INR-
OUTR+
12
OUTR+
INPUTR+
C4 0.47F
2
INR+ R8 10k 1% C12 OPEN R6 10k 1% C11 OPEN
OUTR-
15
OUTR-
JU4 GND
Figure 1. MAX9719A EV Kit Schematic _______________________________________________________________________________________ 3
MAX9719A Evaluation Kit Evaluates: MAX9719A/B/C/D
Figure 2. MAX9719A EV Kit Component Placement Guide-- Component Side
Figure 3. MAX9719A EV Kit PC Board Layout--Component Side
Figure Figure 4. MAX9719A 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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