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PDF MAX9703 Data sheet ( Hoja de datos )
| Número de pieza | MAX9703 | |
| Descripción | 15W / Filterless / Spread-Spectrum Mono/Stereo Class D Amplifiers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3160; Rev 7; 3/06
www.DataSheet4U.com
10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
General Description
The MAX9703/MAX9704 mono/stereo Class D audio
power amplifiers provide Class AB amplifier performance
with Class D efficiency, conserving board space and
eliminating the need for a bulky heatsink. Using a Class
D architecture, these devices deliver up to 15W while
offering up to 78% efficiency. Proprietary and patent-pro-
tected modulation and switching schemes render the tra-
ditional Class D output filter unnecessary.
The MAX9703/MAX9704 offer two modulation schemes:
a fixed-frequency mode (FFM), and a spread-spectrum
mode (SSM) that reduces EMI-radiated emissions due
to the modulation frequency. The device utilizes a fully
differential architecture, a full bridged output, and com-
prehensive click-and-pop suppression.
The MAX9703/MAX9704 feature high 80dB PSRR, low
0.07% THD+N, and SNR in excess of 95dB. Short-cir-
cuit and thermal-overload protection prevent the
devices from being damaged during a fault condition.
The MAX9703 is available in a 32-pin TQFN (5mm x
5mm x 0.8mm) package. The MAX9704 is available in a
32-pin TQFN (7mm x 7mm x 0.8mm) package. Both
devices are specified over the extended -40°C to
+85°C temperature range.
Applications
LCD TVs
LCD Monitors
Desktop PCs
Hands-Free Car
Phone Adaptors
Automotive
LCD Projectors
Features
♦ Filterless Class D Amplifier
♦ Unique Spread-Spectrum Mode Offers 5dB
Emissions Improvement Over Conventional
Methods
♦ Up to 78% Efficient (RL = 8Ω)
♦ Up to 88% Efficient (RL = 16Ω)
♦ 15W Continuous Output Power into 8Ω (MAX9703)
♦ 2x10W Continuous Output Power into 8Ω (MAX9704)
♦ Low 0.07% THD+N
♦ High PSRR (80dB at 1kHz)
♦ 10V to 25V Single-Supply Operation
♦ Differential Inputs Minimize Common-Mode Noise
♦ Pin-Selectable Gain Reduces Component Count
♦ Industry-Leading Click-and-Pop Suppression
♦ Low Quiescent Current (24mA)
♦ Low-Power Shutdown Mode (0.2µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient, Space-Saving
Packages
32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9703
32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9704
Ordering Information
PART
TEMP RANGE
MAX9703ETJ+ -40oC to +85oC
MAX9704ETJ+ -40oC to +85oC
*EP = Exposed paddle.
+Denotes lead-free package.
PIN-PACKAGE
32 TQFN-EP*
32 TQFN-EP*
AMP
Mono
Stereo
Block Diagrams
0.47µF
IN+
0.47µF
IN-
MAX9703
H-BRIDGE
OUT+
OUT-
0.47µF
INL+
0.47µF
INL-
MAX9704
H-BRIDGE
OUTL+
OUTL-
0.47µF
INR+
0.47µF
INR-
H-BRIDGE
OUTR+
OUTR-
Pin Configurations appear at end of data sheet.
________________________________________________________________ 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
10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
Typical Operating Characteristics (continued)
(33µH with 4Ω, 68µH with 8Ω, part in SSM mode, 136µH with 16Ω, measurement BW = 22Hz to 22kHz, unless otherwise noted.)
EFFICIENCY vs. OUTPUT POWER
100
90 RL = 16Ω
80
70
60 RL = 8Ω
50
40
30
20 VDD = 15V
10
AV = 16dB
f = 1kHz
0
0 2 4 6 8 10 12 14 16 18 20
OUTPUT POWER (W)
20
18
16
14
12
10
8
6
4
2
0
10
OUTPUT POWER
vs. SUPPLY VOLTAGE
RL = 8Ω
RL = 16Ω
AV = 16dB
THD+N = 10%
13 16 19 22
SUPPLY VOLTAGE (V)
25
OUTPUT POWER
vs. LOAD RESISTANCE
20
18
VDD = 15V
AV = 16dB
16
THD+N = 10%
14
12
10
8
6
THD+N = 1%
4
2
0
1 10
LOAD RESISTANCE (Ω)
100
OUTPUT POWER
vs. LOAD RESISTANCE
24 VDD = 20V
22 AV = 16dB
THD+N = 10%
20
18
16
14
12
10
8
6 THD+N = 1%
4
2
0
1 10
LOAD RESISTANCE (Ω)
100
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
0
VDD = 15V
-10 RL = 8Ω
AV = 16dB
-20
-30
-40
-50
-60
-70
-80
10
100 1k 10k
FREQUENCY (Hz)
100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
AV = 16dB
RL = 8Ω
-20 200mVP-P INPUT
VDD = 15V
-40
-60
-80
-100
-120
10
100 1k 10k
FREQUENCY (Hz)
100k
CROSSTALK vs. FREQUENCY
0
AV = 16dB
1% THD+N
-20 VDD = 15V
8Ω LOAD
-40
LEFT TO RIGHT
-60
-80
RIGHT TO LEFT
-100
-120
10
100 1k 10k
FREQUENCY (Hz)
100k
OUTPUT FREQUENCY SPECTRUM
20
FFM MODE
0 AV = 16dB
UNWEIGHTED
-20 fIN = 1kHz
POUT = 5W
-40 RL = 8Ω
-60
-80
-100
-120
-140
0 2 4 6 8 10 12 14 16 18 20
FREQUENCY (kHz)
OUTPUT FREQUENCY SPECTRUM
20
SSM MODE
0 AV = 16dB
UNWEIGHTED
-20 fIN = 1kHz
POUT = 5W
-40 RL = 8Ω
-60
-80
-100
-120
-140
0 2 4 6 8 10 12 14 16 18 20
FREQUENCY (kHz)
_______________________________________________________________________________________ 5
5 Page 
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10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
Gain Selection
The MAX9703/MAX9704 feature an internally set, logic-
selectable gain. The G1 and G2 logic inputs set the
gain of the MAX9703/MAX9704 speaker amplifier
(Table 2).
Table 2. Gain Selection
G1 G2
00
01
10
11
GAIN (dB)
29.6
19.1
13
16
Output Offset
Unlike a Class AB amplifier, the output offset voltage of
Class D amplifiers does not noticeably increase quies-
cent current draw when a load is applied. This is due to
the power conversion of the Class D amplifier. For
example, an 8mVDC offset across an 8Ω load results in
1mA extra current consumption in a class AB device. In
the Class D case, an 8mV offset into 8Ω equates
to an additional power drain of 8µW. Due to the high
efficiency of the Class D amplifier, this represents an
additional quiescent current draw of: 8µW/(VDD/100 ✕ η),
which is in the order of a few microamps.
Input Amplifier
Differential Input
The MAX9703/MAX9704 feature a differential input struc-
ture, making them compatible with many CODECs, and
offering improved noise immunity over a single-ended
input amplifier. In devices such as PCs, noisy digital sig-
nals can be picked up by the amplifier’s input traces.
The signals appear at the amplifiers’ inputs as common-
mode noise. A differential input amplifier amplifies the
difference of the two inputs, any signal common to both
inputs is canceled.
Single-Ended Input
The MAX9703/MAX9704 can be configured as single-
ended input amplifiers by capacitively coupling either
input to GND and driving the other input (Figure 4).
Component Selection
Input Filter
An input capacitor, CIN, in conjunction with the input
impedance of the MAX9703/MAX9704, forms a high-
pass filter that removes the DC bias from an incoming
signal. The AC-coupling capacitor allows the amplifier
to bias the signal to an optimum DC level. Assuming
0.47µF
SINGLE-ENDED
AUDIO INPUT
0.47µF
IN+
MAX9703/
IN- MAX9704
Figure 4. Single-Ended Input
zero-source impedance, the -3dB point of the highpass
filter is given by:
f
-3dB
=
1
2πRINCIN
Choose CIN so f-3dB is well below the lowest frequency
of interest. Setting f-3dB too high affects the low-fre-
quency response of the amplifier. Use capacitors with
dielectrics that have low-voltage coefficients, such as
tantalum or aluminum electrolytic. Capacitors with high-
voltage coefficients, such as ceramics, may result in
increased distortion at low frequencies.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100mΩ for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability to
provide sufficient current drive. Increasing the value of
C1 improves load regulation and reduces the charge-
pump output resistance to an extent. Above 1µF, the on-
resistance of the switches and the ESR of C1 and C2
dominate.
Hold Capacitor (C2)
The output capacitor value and ESR directly affect the rip-
ple at CHOLD. Increasing C2 reduces output ripple.
Likewise, decreasing the ESR of C2 reduces both ripple
and output resistance. Lower capacitance values can be
used in systems with low maximum output power levels.
Output Filter
The MAX9703/MAX9704 do not require an output filter
and can pass FCC emissions standards with unshield-
ed speaker cables. However, output filtering can be
______________________________________________________________________________________ 11
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MAX9703.PDF ] | |
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