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PDF MAX9768 Data sheet ( Hoja de datos )
| Número de pieza | MAX9768 | |
| Descripción | 10W Mono Class D Speaker Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0854; Rev 0; 9/07
10W Mono Class D Speaker
Amplifier with Volume Control
www.datasheet4u.com
General Description
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.
Applications
Notebook Computers
Flat-Panel Displays
Multimedia Monitors
GPS Navigation
Systems
Security/Personal
Mobile Radio
Features
♦ 10W Output (8Ω, PVDD = 14V, THD+N = 10%)
♦ Patented Spread-Spectrum Modulation
♦ Meets EN55022B EMC with Ferrite Bead Filters
♦ Amplifier Operation from 4.5V to 14V Supply
♦ 64-Step Integrated Volume Control (I2C or Analog)
♦ Low 0.08% THD+N (RL = 8Ω, POUT = 6W)
♦ High 77dB PSRR
♦ Two tON Times Offered
MAX9768—220ms
MAX9768B—15ms
♦ Low-Power Shutdown Mode (0.5µA)
♦ Short-Circuit and Thermal-Overload Protection
Ordering Information
PART
PIN-PACKAGE tON (ms)
PKG
CODE
MAX9768ETG+
24 TQFN-EP*
220 T2444+4
MAX9768BETG+ 24 TQFN-EP*
15 T2444+4
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+Denotes lead-free package.
*EP = Exposed pad.
Pin Configuration located at end of data sheet.
Simplified Block Diagram
SPEAKER
AUDIO
INPUT
SHDN
MUTE
ANALOG OR
I2C VOLUME
CONTROL
3.3V 4.5V TO 14V
MAX9768
FILTERLESS
CLASS D
SPEAKER
OUTPUT
MAX9768 EMI WITH FERRITE BEAD FILTERS
(VDD = 12V, 1m CABLE, 8Ω LOAD)
40
35
30
25
OVER 20dB MARGIN
20 TO EN55022B LIMIT
15
10
5
0
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
10W Mono Class D Speaker
Amplifier with Volume Control
www.daEtasLhEeeCt4uT.cRomICAL CHARACTERISTICS (continued)
(PVDD = 12V, VDD = 3.3V, GND = PGND = 0V, V SHDN = VDD, VMUTE = 0V; Max volume setting; speaker load resistor connected
between OUT+ and OUT-, RL = ∞, unless otherwise noted. CBIAS = 2.2µF, C1 = C2 = 0.1µF, CIN = 0.47µF, RIN = 20kΩ, RF = 30kΩ,
SSM mode. Filterless modulation mode (see the Functional Diagram/Typical Application Circuit). TA = TMIN to TMAX, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
THERMAL PROTECTION
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Thermal Shutdown
Threshold
150 °C
Thermal Shutdown
Hysteresis
DIGITAL INPUTS (SCLK, SDA/VOL)
Input-Voltage High
Input-Voltage Low
Input High Leakage Current
Input Low Leakage Current
Input Hysteresis
VIH
VIL
IIH VIN = VDD
IIL VIN = GND
Input Capacitance
CIN
DIGITAL OUTPUTS (SDA/VOL)
Output High Current
IOH VOH = VDD
Output Low Voltage
VOL IOL = 3mA
I2C TIMING CHARACTERISTICS (Figure 3)
Serial Clock
fSCL
Bus Free Time Between a
STOP and START
Condition
tBUF
15 °C
0.7 x VDD
0.3 x VDD
±1
±1
0.1 x VDD
5
V
V
µA
µA
V
pF
1 µA
0.4 V
400 kHz
1.3 µs
Hold Time (Repeated)
START Condition
tHD,STA
0.6 µs
Repeated START Condition
Setup Time
STOP Condition Setup Time
Data Hold Time
Data Setup Time
SCL Clock Low Period
SCL Clock High Period
Rise Time of SDA and SCL,
Receiving
tSU,STA
tSU,STO
tHD,DAT
tSU,DAT
tLOW
tHIGH
tR (Note 4)
0.6
0.6
0
100
1.3
0.6
20 +
0.1Cb
µs
µs
0.9 µs
ns
µs
µs
300 ns
Fall Time of SDA and SCL,
Receiving
tF (Note 4)
20 +
0.1Cb
300 ns
_______________________________________________________________________________________ 5
5 Page 
10W Mono Class D Speaker
Amplifier with Volume Control
www.datasheet4u.com
PIN
1, 2
3, 16
4
5
6
7
8
9, 11
10
12
13
14
15
17, 18
19
20
21, 22
23
24
EP
NAME
OUT+
PVDD
BOOT+
SCLK
SDA/VOL
FB
IN
GND
BIAS
SYNC
SYNCOUT
VDD
BOOT-
OUT-
SHDN
MUTE
PGND
ADDR2
ADDR1
EP
Pin Description
FUNCTION
Positive Speaker Output
Speaker Amplifier Power-Supply Input. Bypass with a 1µF capacitor to ground.
Positive Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1µF ceramic capacitor
between BOOT+ and OUT+.
I2C Serial-Clock Input and Modulation Scheme Select. In I2C mode (ADDR1 and ADDR2 ≠ GND)
acts as I2C serial-clock input. When ADDR1 and ADDR2 = GND. Connect SCLK to VDD for classic
PWM modulation, or connect SCLK to ground for filterless modulation.
I2C Serial Data I/O and Analog Volume Control Input
Feedback. Connect feedback resistor between FB and IN to set amplifier gain. See the Adjustable
Gain section.
Audio Input
Ground
Common-Mode Bias Voltage. Bypass with a 2.2µF capacitor to GND.
Frequency Select and External Clock Input.
SYNC = GND: Fixed-frequency mode with fS = 1200kHz.
SYNC = Unconnected: Fixed-frequency mode with fS = 1440kHz.
SYNC = VDD: Spread-spectrum mode with fS = 1200kHz ±30kHz.
SYNC = Clocked: Fixed-frequency mode with fS = external clock frequency.
Clock Signal Output
Power-Supply Input. Bypass with a 1µF capacitor to GND.
Negative Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1µF ceramic capacitor
between BOOTL- and OUTL-.
Negative Speaker Output
Shutdown Input. Drive SHDN low to disable the audio amplifiers. Connect SHDN to VDD for normal
operation
Mute Input. Drive MUTE high to mute the speaker outputs. Connect MUTE to GND for normal
operation.
Power Ground
Address Select Input 2. I2C address option, also selects volume control mode.
Address Select Input 1. I2C address option, also selects volume control mode.
Exposed Pad. Connect the exposed thermal pad to GND, and use multiple vias to a solid copper
area on the bottom of the PCB.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX9768.PDF ] | |
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