MAX9715ETE+ Maxim Integrated Products, MAX9715ETE+ Datasheet - Page 9

• Manufacturer Part Number: MAX9715ETE+
• Description: IC AMP AUDIO PWR 2.8W D 16TQFN
• Manufacturer: Maxim Integrated Products
• Type: Class Dr

Specifications of MAX9715ETE+

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 2.8W x 2 @ 4 Ohm
• Voltage - Supply: 4.5 V ~ 5.5 V
• Features: Depop, Short-Circuit and Thermal Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Product: Class-D
• Output Power: 2.8 W
• Thd Plus Noise: 0.06 %
• Operating Supply Voltage: 5 V
• Supply Current: 12.8 mA
• Maximum Power Dissipation: 1666 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Amplifier Class: D
• No. Of Channels: 2
• Supply Voltage Range: 4.5V To 5.5V
• Load Impedance: 4ohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: TQFN
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Voice coil movement due to the square-wave frequency
is very small because the switching frequency of the
MAX9715 is well beyond the bandwidth of most speak-
ers. Although this movement is small, a speaker not
designed to handle the additional power may be
damaged. Use a speaker with a series inductance
> 30μH for optimum efficiency. Typical 8Ω speakers
exhibit series inductances in the 30μH to 100μH range.
The highest efficiency is achieved with speaker induc-
tances > 60μH.
The input capacitor (C
input resistance (R
removes the DC bias from an incoming signal (see the
Typical Application Circuit ). The AC-coupling capacitor
allows the amplifier to bias the signal to an optimum DC
level. Assuming zero source impedance, the -3dB point
of the highpass filter is given by:
Figure 4. Optional Speaker Amplifier Output Filter—Guidelines for FCC Compliance
<75mm OF SPEAKER CABLE.
MAX9715
TYPICAL APPLICATION
OUTR+
OUTL+
OUTL-
OUTR-
(a)
f
2.8W, Low-EMI, Stereo, Filterless Class D
−
3
_______________________________________________________________________________________
dB
IN
IN
=
), forms a highpass filter that
), in conjunction with the amplifier
2π
×
Component Selection
R
IN
1
MAX9715
×
C
IN
APPLICATIONS USING CABLE LENGTHS
OUTR+
OUTL+
OUTR-
OUTL-
COMMON-MODE CHOKE FOR
GREATER THAN 150mm.
Input Filter
(b)
R
in the Electrical Characteristics table. Choose C
f
Setting f
response. Use capacitors with low-voltage coefficient
dielectrics, such as tantalum or aluminum electrolytic.
Capacitors with high-voltage coefficients, such as ceram-
ics, may result in increased distortion at low frequencies.
The inability of small diaphragm speakers to reproduce
low frequencies can be exploited to improve click-and-
pop performance. Set the cutoff frequency of the
MAX9715’s input highpass filter to match the speaker’s
frequency response. Doing so will allow for smaller C
values and reduce click-and-pop.
The MAX9715 speaker amplifiers do not require output
filters. However, output filtering can be used if a design
is failing radiated emissions due to board layout, cable
length, or the circuit is near EMI-sensitive devices. Use
a ferrite bead filter or a common-mode choke when radi-
ated frequencies above 10MHz are of concern. Use an
LC filter when radiated frequencies below 10MHz are of
concern, or when long cables (>75mm) connect the
amplifier to the speaker. Figure 4 shows possible output
filter connections.
-3dB
IN
is the amplifier’s internal input resistance value given
is well below the lowest frequency of interest.
-3dB
MAX9715
too high affects the amplifier’s low-frequency
OUTR+
OUTL+
OUTR-
OUTL-
Audio Amplifier
LC FILTER WHEN USING LONG CABLE
LENGTHS OR IN APPLICATIONS
THAT ARE SENSITIVE TO EMI.
(c)
Output Filter
IN
so
IN
9