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PDF MAX9708 Data sheet ( Hoja de datos )
| Número de pieza | MAX9708 | |
| Descripción | 20W/40W Filterless Spread-Spectrum Mono/Stereo Class D Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3678; Rev 0; 7/05
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
20W/40W, Filterless, Spread-Spectrum,
Mono/Stereo, Class D Amplifier
General Description
The MAX9708 mono/stereo, Class D audio power ampli-
fier 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
amplifier performance with the benefits of Class D effi-
ciency, 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 configu-
ration.
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.
Applications
LCD TVs
Automotive
PDP TVs
PC/HiFi Audio Solutions
Pin Configurations appear at end of data sheet.
Features
♦ 2 x 21W Output Power in Stereo Mode
(8Ω, THD = 10%)
♦ 1 x 42W Output Power in Mono Mode
(4Ω, THD = 10%)
♦ High Efficiency: Up to 87%
♦ Filterless Class D Amplifier
♦ Unique Patented Spread-Spectrum Mode
♦ Programmable Gain (+22dB, +25dB, +29.5dB,
+36dB)
♦ High PSRR (90dB at 1kHz)
♦ Differential Inputs Suppress Common-Mode
Noise
♦ 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
Packages: 56-Pin TQFN and 64-Pin TQFP
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9708ETN -40°C to +85°C 56 TQFN-EP**
MAX9708ECB* -40°C to +85°C 64 TQFP-EP**
*Future product—Contact factory for availability.
**EP = Exposed paddle.
PKG
CODE
T5688-3
C64E-6
Simplified Block Diagram
FS1, FS2
SYNC
RIGHT
CHANNEL
LEFT
CHANNEL
MONO
G1, G2
TH0, TH1,
TH2
2
2
MAX9708
SYNCOUT
GAIN
CONTROL
CLASS D
MODULATOR
OUTPUT
PROTECTION
3
STEREO MODE
TEMP
FS1, FS2
SYNC
2
MAX9708
SYNCOUT
AUDIO
INPUT
VDIGITAL
MONO
G1, G2
TH0, TH1,
TH2
2
GAIN
CONTROL
CLASS D
MODULATOR
OUTPUT
PROTECTION
3
MONO MODE
TEMP
________________________________________________________________ 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.
1 page  
www.DataSheet4U.com
20W/40W, Filterless, Spread-Spectrum,
Mono/Stereo, Class D Amplifier
Typical Operating Characteristics
(PVDD = VDD = +18V, PGND = GND = 0V, CSS = 0.47µF, CREG = 0.01µF, C1 = 0.1µF, C2 = 1µF, RLOAD = ∞, SHDN = high, MONO
= low, MUTE = high, G1 = low, G2 = high, FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (RL) are between OUT_+ and
OUT_-, TA = +25°C, unless otherwise stated.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
100
PVDD = 18V, 8Ω
STEREO MODE, 1kHz
10
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
100
PVDD = 12V,
STEREO MODE,
fIN = 1kHz
10
RL = 8Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
1
PVDD = 18V,
8Ω STEREO MODE,
POUT = 8.3W PER
CHANNEL
1 1 0.1
0.1 0.1 RL = 4Ω
0.01
0
5 10 15 20 25
OUTPUT POWER PER CHANNEL (W)
30
EFFICIENCY vs. OUTPUT POWER
100
90
80
70
60
50
40
30
20
10
0
PVDD = 18V, 8Ω
STEREO MODE
5 10 15 20 25
OUTPUT POWER PER CHANNEL (W)
30
0.01
0
5 10
OUTPUT POWER PER CHANNEL (W)
OUTPUT POWER
vs. SUPPLY VOLTAGE
30
RL = 8Ω
STEREO MODE
25
15
20 10% THD+N
15
10
1% THD+N
5
0
10 12 14 16 18
SUPPLY VOLTAGE (V)
0.01
10
100 1k 10k
FREQUENCY (Hz)
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
24
STEREO MODE
22
TA = +85°C TA = +25°C
20
100k
18
16 TA = -40°C
14
12
10
10
12 14 16 18 20
SUPPLY VOLTAGE (V)
22
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
4.0
SHDN = 0
3.5
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
100
PVDD = 18V, 4Ω MONO MODE,
1kHz
3.0 10
2.5
2.0 1
1.5
1.0 0.1
0.5
0
10 12 14 16 18 20 22
SUPPLY VOLTAGE (V)
0.01
0
10 20 30 40 50
OUTPUT POWER (W)
60
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
20W/40W, Filterless, Spread-Spectrum,
Mono/Stereo, Class D Amplifier
Typical Application Circuits/Functional Diagrams (continued)
VDD
0.1µF
PVDD
47µF*
VDIGITAL
15 (18) FS1
14 (15) FS2
13 (14) SYNCIN
22, 23
(25, 26)
GND
25 (28)
VDD
CONTROL
5–7, 36–38
(5–7, 42–44)
0.1µF
2–4, 39–41 49–50
(2–4, 45–47, 56–57)
VDIGITAL
PVDD
PGND
10kΩ
SYNCOUT 11 (12)
RF MAX9708
1µF
+ 17 (20) INR+
AUDIO
INPUT
-
1µF
16 (19) INR-
RIN
RIN
VDIGITAL
VDIGITAL
30 (35)
31 (36)
28 (31)
SHDN
MUTE
G1
29 (34) G2
18 (21) MONO
VBIAS
RF
MUX
GAIN
CONTROL
THERMAL SENSOR
PVDD
CLASS D
MODULATOR
AND H-BRIDGE
OUTL+ 53, 54 (61, 62)
OUTL- 51, 52 (59, 60)
PVDD
CLASS D
MODULATOR
AND H-BRIDGE
CHARGE
PUMP
OUTR+ 47, 48 (53, 54)
OUTR- 45, 46 (51, 52)
CPVDD
C1P
C1N
10 (11)
9 (10)
8 (9)
C2
1µF
PVDD
C1
0.1µF
REGULATOR
REG 19, 20, 21 (22, 23, 24)
TEMP 32 (37)
CREG
0.01µF
TH0 TH1 TH2
35 (40) 34 (39)
33 (38)
VDIGITAL
SS
24 (27)
CSS
0.47µF
10kΩ
VDIGITAL
CONFIGURATION: TQFN MONO MODE, SSM, INTERNAL OSCILLATOR, GAIN = 22dB, THERMAL SETTING = +120°C
( ) TQFP PACKAGE
*ADDITIONAL BULK CAPACITANCE
Figure 2. Typical Application and Functional Diagram in Mono Mode
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX9708.PDF ] | |
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