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19-3311; Rev 0; 6/04
MAX9722A Evaluation Kit
General Description
The MAX9722A evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9722A to drive a stereo headphone in portable audio applications. The MAX9722A is a differential stereo headphone driver with DirectDrive. MAXIM's patented DirectDrive technology eliminates the need for DC-blocking capacitors on the output of the amplifier. Designed to operate from a 2.4V to 5.5V DC power supply, the EV kit is capable of delivering up to 70mW per channel into a 16 load or 130mW per channel into a 32 load and 0.009% THD+N at 1kHz. The EV kit can also be used as a line driver that provides 2VRMS into a 1k load from a single 5V supply. The MAX9722A EV kit also evaluates the MAX9722B.
Features
o 2.4V to 5.5V Single-Supply Operation o Drives Two Channels at 70mW per Channel into a 16 load, 130mW per Channel into a 32 load o 2A Shutdown Current o Evaluates the MAX9722A or MAX9722B (IC and Component Replacement Required) o Small 16-Pin TQFN (3mm x 3mm) Package o Available in 16-Pin TSSOP Package o Fully Assembled and Tested
Evaluates: MAX9722A/MAX9722B
Ordering Information
PART MAX9722AEVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 TQFN-EP*
*EP = Exposed paddle.
Component List
DESIGNATION QTY A1 C1-C4 1 4 DESCRIPTION MAX9722AEUE (16-pin TSSOP) 1F 20%, 16V plastic film capacitors (1210) Panasonic ECPU1C105MA5 10F 20%, 6.3V X5R ceramic capacitor (0805) TDK C2012X5R0J106M 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K 3.5mm stereo headphone jack 3-pin header 2-pin header 10k 1% resistors (0603) Not installed, resistors (0603) 0 5% resistor (1206) MAX9722AETE (16-pin TQFN, 3mm x 3mm) Shunts MAX9722A PC board SUPPLIER Panasonic TDK PHONE
Component Suppliers
FAX 714737-7323 847390-4405 WEBSITE www.panasonic.com www.component.tdk.com 714373-7366 847803-6100
C5
1
Note: Indicate that you are using the MAX9722A when contacting these component suppliers.
Quick Start
The MAX9722A 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.
C6-C11 J1 JU1 JU2 R1-R8 R9, R10 R11 U1 None None
6 1 1 1 8 0 1 1 2 1
Recommended Equipment
* 2.4V to 5.5V, 500mA power supply * Audio signal source (i.e., CD or MP3 player) * 16 or 32 headphone
Procedure
1) Verify that a shunt is installed across pins 1 and 2 of jumper JU1 (EV kit ON). 2) Verify that no shunt is installed across jumper JU2 (remote GND sensing OFF). 3) Plug the headphone into headphone jack J1. 4) Connect the positive terminal of the power supply to the PVDD pad and ground terminal to the PGND pad.
________________________________________________________________ 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.
MAX9722A Evaluation Kit Evaluates: MAX9722A/MAX9722B
5) Connect the left output of the audio source to the INPUTL- pad. 6) Connect the ground of the audio source to the INPUTL+ pad. 7) Connect the right output of the audio source to the INPUTR- pad. 8) Connect the ground of the audio source to the INPUTR+ pad. 9) Turn on the power supply. 10) Turn on the audio source. Refer to the MAX9722A/MAX9722B data sheet for additional information on using the MAX9722B as a headphone amplifier or as an audio line driver.
Table 1. JU1 Jumper Selection
SHUNT POSITION 1-2 (SHDN = high) 2-3 (SHDN = low) None. External controller connected to SHDN pad (logic level). EV KIT FUNCTION EV kit enabled Shutdown mode SHDN driven by external controller. Shutdown is active low.
Detailed Description
The MAX9722A EV kit features the MAX9722A differential stereo headphone amplifier with DirectDrive, which is designed to directly drive a 16 or 32 stereo headphone in portable audio applications. The EV kit operates from a DC power supply that can provide 2.4V to 5.5V and 500mA of current. The EV kit accepts two sets of differential or single-ended audio inputs. The amplifier is able to deliver 70mW per channel into a 16 load or 130mW per channel into a 32 load. The EV kit can also be used as an audio line driver to provide 2VRMS into a 1k load from a single 5V supply. When used in this way, the EV kit features a remote ground-sensing network to reduce any ground loop noise at the receiving device (see the Remote Ground Sensing section).
Table 2. JU2 Jumper Selection
SHUNT POSITION R9, R10 R3, R4, R11 R7, R8 () REMOTE GND SENSING EV KIT FUNCTION
Not installed (default)
Open
10k
0
Differential inputs, Not output configured referenced to local ground Single-ended inputs, Configured output senses remote ground
Jumper Selection Shutdown Mode (SHDN)
Jumper JU1 controls the shutdown pin (SHDN) of the MAX9722A. See Table 1 for jumper positions. Remote Ground Sensing Jumper JU2, resistors R9 and R10 configure the remote ground-sensing feature for the MAX9722A EV kit. See Table 2 for jumper shunt positions and approximate resistor values. Note: When using the remote ground-sensing feature, remove resistors R3, R4, R7, and R8. Install a 10k resistor at the R9 and R10 PC board pads. Replace R11 with a 10 resistor. In this mode of operation, the input signals on the INPUTL- and INPUTR- pads are referenced to the EV kit PGND pad and are single ended. If headphones are used in this configuration, channel-tochannel isolation may be degraded. Evaluating the MAX9722B The MAX9722A EV kit can evaluate the MAX9722B. To evaluate the MAX9722B, replace U1 with a MAX9722B and replace the components as outlined in Table 3.
2
Installed
10k
Open
10
Table 3. Component Values for Evaluating the MAX9722B
EV KIT USES DIFFERENTIAL INPUTS; OUTPUT REFERRED TO LOCAL GROUND MAX9722B 0 Open 15k 30k Open Open 0 Not installed EV KIT USES SINGLE-ENDED INPUTS, OUTPUT SENSES REMOTE GROUND MAX9722B 0 Open Open Open 30k 15k 10 Installed
COMPONENT
U1 R1, R5 R2, R6 R3, R7 R4, R8 R9 R10 R11 JU2
_______________________________________________________________________________________
MAX9722A Evaluation Kit Evaluates: MAX9722A/MAX9722B
OUTR J1 3 1 2 R9 OPEN R10 OPEN C11 1F INPUTLR11 0 SGND OUTL 12 C1 1F R1 10k R2 10k 14 INLINROUTL OUTR 10 R6 10k 8 C3 1F
R5 10k INR+
INPUTR-
JU2 INR+
INPUTL+
C2 1F
R3 10k 15 R4 10k INL+
U1 MAX9722A
INR+
7 R8 10k 11 5 C10 1F 2 4 3 C9 1F
R7 10k
C4 1F
INPUTR+
SVSS PVDD PGND C5 10F C6 1F 13 C7 1F 9 PVDD SHDN 1 2 3 C8 1F 16 1 PVDD PVSS
SVDD
C1P C1N
SVDD
PGND
JU1
SHDN
SGND
6
Figure 1. MAX9722A EV Kit Schematic
_______________________________________________________________________________________
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MAX9722A Evaluation Kit Evaluates: MAX9722A/MAX9722B
Figure 2. MAX9722A EV Kit Component Placement Guide-- Component Side
Figure 3. MAX9722A EV Kit PC Board Layout--Component Side
Figure 4. MAX9722A EV Kit PC Board Layout--Solder Side
Figure 5. MAX9722A 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.
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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