max9708etntd Maxim Integrated Products, Inc., max9708etntd Datasheet

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max9708etntd

Manufacturer Part Number
max9708etntd
Description
Max9708 20w/40w, Filterless, Spread-spectrum, Mono/stereo, Class D Amplifier
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX9708ETNTD.pdf (24 pages)
The MAX9708 mono/stereo, Class D audio power amplifi-
er delivers up to 2 x 21W into an 8Ω stereo mode and
1 x 42W into a 4Ω load in mono mode while offering up to
87% efficiency. The MAX9708 provides Class AB amplifi-
er performance with the benefits of Class D efficiency,
eliminating the need for a bulky heatsink and conserving
power. The MAX9708 operates from a single +10V to
+18V supply, driving the load in a BTL configuration.
The MAX9708 offers two modulation schemes: a fixed-
frequency modulation (FFM) mode, and a spread-spec-
trum modulation (SSM) mode that reduces
EMI-radiated emissions. The MAX9708 can be synchro-
nized to an external clock from 600kHz to 1.2MHz. A
synchronized output allows multiple units to be cascad-
ed in the system.
Features include fully differential inputs, comprehensive
click-and-pop suppression, and four selectable-gain set-
tings (22dB, 25dB, 29.5dB, and 36dB). A pin-program-
mable thermal flag provides seven different thermal
warning thresholds. Short-circuit and thermal-overload
protection prevent the device from being damaged
during a fault condition.
The MAX9708 is available in 56-pin TQFN (8mm x 8mm
x 0.8mm) and 64-pin TQFP (10mm x 10mm x 1.4mm)
packages, and is specified over the extended
-40°C to +85°C temperature range.
19-3678; Rev 2; 3/06
Pin Configurations appear at end of data sheet.
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.
CHANNEL
CHANNEL
TH0, TH1,
FS1, FS2
G1, G2
MONO
SYNC
LCD TVs
Automotive
RIGHT
LEFT
TH2
2
CONTROL
GAIN
________________________________________________________________ Maxim Integrated Products
2
20W/40W, Filterless, Spread-Spectrum,
STEREO MODE
General Description
MODULATOR
CLASS D
3
PDP TVs
PC/HiFi Audio Solutions
MAX9708
PROTECTION
Applications
OUTPUT
Mono/Stereo, Class D Amplifier
SYNCOUT
TEMP
TH0, TH1,
♦ 2 x 21W Output Power in Stereo Mode
♦ 1 x 42W Output Power in Mono Mode
♦ High Efficiency: Up to 87%
♦ Filterless Class D Amplifier
♦ Unique Patented Spread-Spectrum Mode
♦ Programmable Gain (+22dB, +25dB, +29.5dB,
♦ High PSRR (90dB at 1kHz)
♦ Differential Inputs Suppress Common-Mode
♦ Shutdown and Mute Control
♦ Integrated Click-and-Pop Suppression
♦ Low 0.1% THD+N
♦ Current Limit and Thermal Protection
♦ Programmable Thermal Flag
♦ SYNC Input/Output
♦ Available in Thermally Efficient, Space-Saving
FS1, FS2
+Denotes lead-free package.
*Future product—Contact factory for availability.
**EP = Exposed paddle.
MAX9708ETN+
MAX9708ECB*
G1, G2
AUDIO
INPUT
SYNC
(8Ω, THD = 10%)
(4Ω, THD = 10%)
+36dB)
Noise
Packages: 56-Pin TQFN and 64-Pin TQFP
TH2
V
DIGITAL
MONO
PART
2
CONTROL
Simplified Block Diagram
GAIN
2
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
MONO MODE
MODULATOR
CLASS D
3
PIN-PACKAGE
56 TQFN-EP**
64 TQFP-EP**
MAX9708
PROTECTION
OUTPUT
Features
SYNCOUT
TEMP
T5688-3
C64E-6
CODE
PKG
1

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max9708etntd Summary of contents

Page 1

Rev 2; 3/06 20W/40W, Filterless, Spread-Spectrum, General Description The MAX9708 mono/stereo, Class D audio power amplifi- er delivers 21W into an 8Ω stereo mode and 1 x 42W into a 4Ω load in mono mode ...

Page 2

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier ABSOLUTE MAXIMUM RATINGS PGND, GND .......................................-0.3 to +30V ..........................................................-0.3V to +0. OUTR+, OUTR-, OUTL+, OUTL- to PGND, GND...........................-0.3V to (PV C1N to ...

Page 3

Filterless, Spread-Spectrum, ELECTRICAL CHARACTERISTICS (continued) ( +18V, PGND = GND = 0V mode), SHDN = MUTE = high low high (A connected between OUT_+ and OUT_-, unless otherwise stated. ...

Page 4

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier ELECTRICAL CHARACTERISTICS (continued) ( +18V, PGND = GND = 0V mode), SHDN = MUTE = high low high (A connected between OUT_+ and ...

Page 5

Filterless, Spread-Spectrum, ( +18V, PGND = GND = 0V low, MUTE = high low high, FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R ...

Page 6

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier ( +18V, PGND = GND = 0V low, MUTE = high low high, FS1 = FS2 = high (SSM), SYNCIN = low. ...

Page 7

Filterless, Spread-Spectrum, ( +18V, PGND = GND = 0V low, MUTE = high low high, FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R ...

Page 8

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier ( +18V, PGND = GND = 0V low, MUTE = high low high, FS1 = FS2 = high (SSM), SYNCIN = low. ...

Page 9

Filterless, Spread-Spectrum, PIN NAME TQFP TQFN 9 8 C1N 10 9 C1P 11 10 CPV SYNCOUT Open-Drain, Slew-Rate Limited Clock Output. Pullup with a 10kΩ resistor to REG SYNCIN 15 14 FS2 18 15 ...

Page 10

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier V DIGITAL 15 (18) FS1 14 (15) FS2 13 (14) SYNCIN 1µ (20) INL+ + LEFT CHANNEL 1µ (19) INL- - 1µ (30) INR+ ...

Page 11

Filterless, Spread-Spectrum, Typical Application Circuits/Functional Diagrams (continued) (25, 26) V DIGITAL FS1 15 (18) 14 (15) FS2 13 (14) SYNCIN 1µ (20) INR+ + AUDIO INPUT 1µ (19) INR (35) SHDN ...

Page 12

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier Detailed Description The MAX9708 filterless, Class D audio power amplifier features several improvements to switch-mode amplifi- er technology. The MAX9708 is a two-channel, stereo amplifier with 21W output power on each channel. The ...

Page 13

Filterless, Spread-Spectrum, TEMP returns high once the junction temperature cools below the set threshold minus the thermal hysteresis. If TEMP is connected to either MUTE or SS, the audio output resumes. The temperature threshold is set by the TH0, ...

Page 14

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier Linear Regulator (REG) The supply voltage range for the MAX9708 is from 10V to 18V to achieve high-output power. An internal linear regulator reduces this voltage to 6.3V for use with small-signal and ...

Page 15

Filterless, Spread-Spectrum, Sharing Input Sources In certain systems, a single audio source can be shared by multiple devices (speaker and headphone amplifiers). When sharing inputs common to mute the unused device, rather than completely shutting it down, ...

Page 16

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier Auxiliary Heatsinking If operating in higher ambient temperatures possible to improve the thermal performance board with the addition of an external heatsink. The thermal resis- tance to this ...

Page 17

Filterless, Spread-Spectrum, Mismatch in the components can cause discrepancies between the nominal transfer function and actual perfor- mance. Also, the mismatch of the input resistors (R15, R17, R19, and R21 in Figure 6) of the summing amplifier and lowpass ...

Page 18

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier RIGHT AUDIO INPUT LEFT AUDIO INPUT NOTE: OP-AMP POWER PINS OMITTED FOR CLARITY. ALL RESISTORS ARE 1% OR BETTER. ALL CAPACITORS ARE 5% OR BETTER. Figure 6. Fully Differential Crossover Filters 18 ______________________________________________________________________________________ ...

Page 19

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier TOP VIEW N.C. 43 N.C. 44 OUTR- 45 OUTR- 46 OUTR+ 47 OUTR+ 48 PGND 49 PGND 50 OUTL- 51 OUTL- 52 OUTL+ 53 OUTL+ 54 N.C. ...

Page 20

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier TOP VIEW N.C. 1 PGND 2 PGND 3 PGND N.C. 8 C1N 9 C1P 10 CPV 11 DD SYNCOUT 12 N.C. 13 SYNCIN ...

Page 21

Filterless, Spread-Spectrum, (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Mono/Stereo, Class D Amplifier Package Information PACKAGE OUTLINE 56L THIN QFN, 8x8x0.8mm 1 ...

Page 22

Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 22 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE 56L THIN QFN, ...

Page 23

Filterless, Spread-Spectrum, (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Mono/Stereo, Class D Amplifier Package Information (continued) PACKAGE OUTLINE, 64L TQFP, 10x10x1.4mm 1 ...

Page 24

... Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Freed Package Information (continued) Printed USA is a registered trademark of Maxim Integrated Products, Inc. PACKAGE OUTLINE, 64L TQFP, 10x10x1.4mm 2 21-0083 B 2 ...

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