MAX9768EVKIT+ Maxim Integrated Products, MAX9768EVKIT+ Datasheet

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MAX9768EVKIT+

Manufacturer Part Number
MAX9768EVKIT+
Description
EVALUATION KIT FOR MAX9768
Manufacturer
Maxim Integrated Products
Datasheets

Specifications of MAX9768EVKIT+

Amplifier Type
Class D
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
10W x 1 @ 8 Ohm
Voltage - Supply
4.5 V ~ 14 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
MAX9768
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9768 mono 10W Class D speaker amplifier
provides high-quality, efficient audio power with an inte-
grated volume control function.
The MAX9768 features a 64-step dual-mode (analog or
digitally programmable) volume control and mute func-
tion. The audio amplifier operates from a 4.5V to 14V
single supply and can deliver up to 10W into an 8Ω
speaker with a 14V supply.
A selectable spread-spectrum mode reduces EMI-radiat-
ed emissions, allowing the device to pass EMC testing
with ferrite bead filters and cable lengths up to 1m. The
MAX9768 can be synchronized to an external clock,
allowing synchronization of multiple Class D amplifiers.
The MAX9768 features high 77dB PSRR, low 0.08%
THD+N, and SNR up to 97dB. Robust short-circuit and
thermal-overload protection prevent device damage
during a fault condition. The MAX9768 is available in a
24-pin thin QFN-EP (4mm x 4mm x 0.8mm) package
and is specified over the extended -40°C to +85°C tem-
perature range.
19-0854; Rev 2; 11/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Notebook Computers
Flat-Panel Displays
Multimedia Monitors
SPEAKER
AUDIO
INPUT
________________________________________________________________ Maxim Integrated Products
I
ANALOG OR
2
C VOLUME
CONTROL
SHDN
MUTE
General Description
GPS Navigation
Systems
Security/Personal
Mobile Radio
Applications
3.3V
MAX9768
Amplifier with Volume Control
4.5V TO 14V
10W Mono Class D Speaker
♦ 10W Output (8Ω, PV
♦ Spread-Spectrum Modulation
♦ Meets EN55022B EMC with Ferrite Bead Filters
♦ Amplifier Operation from 4.5V to 14V Supply
♦ 64-Step Integrated Volume Control (I
♦ Low 0.08% THD+N (R
♦ High 77dB PSRR
♦ Two t
♦ Low-Power Shutdown Mode (0.5µA)
♦ Short-Circuit and Thermal-Overload Protection
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configuration located at end of data sheet.
MAX9768ETG+
MAX9768BETG+
FILTERLESS
CLASS D
SPEAKER
OUTPUT
MAX9768—220ms
MAX9768B—15ms
PART
ON
Times Offered
40
35
30
25
20
15
10
5
0
MAX9768 EMI WITH FERRITE BEAD FILTERS
Simplified Block Diagram
0
(V
100 200 300
DD
24 TQFN-EP*
24 TQFN-EP*
= 12V, 1m CABLE, 8Ω LOAD)
Ordering Information
DD
OVER 20dB MARGIN
TO EN55022B LIMIT
PIN-PACKAGE
L
FREQUENCY (MHz)
400
= 8Ω, P
= 14V, THD+N = 10%)
500 600
OUT
700
800
= 6W)
900
2
Features
C or Analog)
1000
t
ON
220
15
(ms)
1

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MAX9768EVKIT+ Summary of contents

Page 1

... SHDN MUTE ANALOG VOLUME CONTROL ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 10W Mono Class D Speaker Amplifier with Volume Control ♦ 10W Output (8Ω, PV ♦ Spread-Spectrum Modulation ♦ Meets EN55022B EMC with Ferrite Bead Filters ♦ ...

Page 2

Mono Class D Speaker Amplifier with Volume Control ABSOLUTE MAXIMUM RATINGS PV to PGND........................................................-0.3V to +16V GND ..............................................................-0.3V to +4V DD SCLK, SDA/VOL to GND ..........................................-0.3V to +4V FB, SYNCOUT ............................................-0. BOOT_ to OUT_........................................................-0.3V ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD GND PGND = ∞, unless otherwise noted. C between OUT+ and OUT SSM mode. Filterless modulation mode (see the Functional Diagram/Typical Application Circuit ). ...

Page 4

Mono Class D Speaker Amplifier with Volume Control ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD GND PGND = ∞, unless otherwise noted. C between OUT+ and OUT SSM mode. Filterless ...

Page 5

ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD GND PGND = ∞, unless otherwise noted. C between OUT+ and OUT SSM mode. Filterless modulation mode (see the Functional Diagram/Typical Application Circuit ). ...

Page 6

Mono Class D Speaker Amplifier with Volume Control ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD GND PGND = ∞, unless otherwise noted. C between OUT+ and OUT SSM mode. Filterless ...

Page 7

V = 3.3V PVDD DD GND PGND and OUT 8Ω, unless otherwise noted trum modulation mode.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY ...

Page 8

Mono Class D Speaker Amplifier with Volume Control (V = 12V 3.3V PVDD GND PGND and OUT 8Ω, unless otherwise noted trum modulation mode.) EFFICIENCY vs. OUTPUT POWER 100 ...

Page 9

V = 3.3V PVDD DD GND PGND and OUT 8Ω, unless otherwise noted trum modulation mode.) POWER-SUPPLY REJECTION RATIO ( vs. FREQUENCY 12V DD -10 ...

Page 10

Mono Class D Speaker Amplifier with Volume Control (V = 12V 3.3V PVDD DD GND PGND and OUT 8Ω, unless otherwise noted trum modulation mode.) WIDEBAND OUTPUT SPECTRUM (SPREAD-SPECTRUM MODULATION ...

Page 11

PIN NAME 1, 2 OUT+ Positive Speaker Output Speaker Amplifier Power-Supply Input. Bypass with a 1µF capacitor to ground. DD Positive Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1µF ceramic capacitor 4 BOOT+ between BOOT+ and OUT+. ...

Page 12

Mono Class D Speaker Amplifier with Volume Control 0.47μF 20kΩ (SHOWN IN ANALOG VOLUME CONTOL MODE Detailed Description The MAX9768 10W, Class D audio power amplifier with spread-spectrum modulation provides a ...

Page 13

Operating Modes Fixed-Frequency Mode The MAX9768 features two fixed-frequency modes: 300kHz and 360kHz. Connect SYNC to GND to select 300kHz switching frequency; leave SYNC unconnected to select 360kHz switching frequency. The frequency spectrum of the MAX9768 consists of the fundamental ...

Page 14

Mono Class D Speaker Amplifier with Volume Control Filterless Modulation/PWM Modulation The MAX9768 features two output modulation schemes: filterless modulation or classic PWM, selec- table through SCLK when the device is in analog mode (ADDR2 and ADDR1 = GND, ...

Page 15

Hard Current Limit When the output current exceeds the hard current limit, 2.5A (typ), the MAX9768 disables the outputs and initi- ates a startup sequence. This startup sequence takes 220ms for the MAX9768 and 15ms for the MAX9768B. The shutdown ...

Page 16

Mono Class D Speaker Amplifier with Volume Control SDA t SU,DAT t LOW SCL t HIGH t HD,STA t R START CONDITION Figure 3. 2-Wire Serial-Interface Timing Diagram One data bit is transferred during each SCL cycle. The data ...

Page 17

Table 3. Slave Address Block SA7 (MSB) SA6 1 0 Table 4. Slave Address ADDR2 ADDR1 write to the MAX9768 includes transmission of a START condition, the slave address with the ...

Page 18

Mono Class D Speaker Amplifier with Volume Control Table 5. Data Byte Format (MSB Table 6. Speaker Volume Levels ...

Page 19

Table 6. Speaker Volume Levels (continued ...

Page 20

Mono Class D Speaker Amplifier with Volume Control Applications Information Filterless Class D Operation The MAX9768 can be operated without a filter and meet common EMC radiation limits when the speaker leads are less than approximately 10cm. Lengths beyond ...

Page 21

Inductor-Based Output Filters Some applications will use the MAX9768 with a full inductor-/capacitor-based (LC) output filter. This is common for longer speaker lead lengths, and to gain increased margin to EMC limits. Select the PWM output mode and use fixed-frequency ...

Page 22

Mono Class D Speaker Amplifier with Volume Control AUDIO INPUT IN MAX9768 Figure 9. Setting Gain The MAX9768 has different supplies for each portion of the device, allowing for the optimum combination ...

Page 23

Pin Configuration TOP VIEW SHDN 19 MUTE 20 PGND 21 MAX9768 PGND 22 ADDR2 23 + ADDR1 TQFN (4mm × 4mm) ______________________________________________________________________________________ 10W Mono Class D Speaker ...

Page 24

Mono Class D Speaker Amplifier with Volume Control For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 24 TQFN-EP 24 ______________________________________________________________________________________ Package Information PACKAGE CODE T2444+4 DOCUMENT NO. 21-0139 ...

Page 25

For the latest package outline information and land patterns www.maxim-ic.com/packages. ______________________________________________________________________________________ 10W Mono Class D Speaker Amplifier with Volume Control Package Information (continued) 25 ...

Page 26

... 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. 26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products ...

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