MAX9713(2004) 데이터 시트보기 (PDF) - Maxim Integrated
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MAX9713 Datasheet PDF : 18 Pages
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6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers
resistance of the switches and the ESR of C1 and C2
dominate.
Output Capacitor (C2)
The output capacitor value and ESR directly affect the
ripple at CHOLD. Increasing C2 reduces output ripple.
Likewise, decreasing the ESR of C2 reduces both rip-
ple and output resistance. Lower capacitance values
can be used in systems with low maximum output
power levels.
Output Filter
The MAX9713/MAX9714 do not require an output filter.
The device passes FCC emissions standards with
36cm of unshielded speaker cables. However, output
filtering can be used if a design is failing radiated emis-
sions due to board layout or cable length, or the circuit
is near EMI-sensitive devices. Use a ferrite bead filter
when radiated frequencies above 10MHz are of con-
cern. Use an LC filter when radiated frequencies below
10MHz are of concern, or when long leads connect the
amplifier to the speaker. Refer to the MAX9714
Evaluation Kit schematic for details of this filter.
Sharing Input Sources
In certain systems, a single audio source can be shared
by multiple devices (speaker and headphone ampli-
fiers). When sharing inputs, it is common to mute the
unused device, rather than completely shutting it down,
preventing the unused device inputs from distorting the
input signal. Mute the MAX9713/MAX9714 by driving SS
low through an open-drain output or MOSFET (see the
System Diagram). Driving SS low turns off the class D
output stage, but does not affect the input bias levels of
the MAX9713/MAX9714. Be aware that during normal
operation, the voltage at SS can be up to 7V, depending
on the MAX9713/MAX9714 supply.
Supply Bypassing/Layout
Proper power-supply bypassing ensures low distortion
operation. For optimum performance, bypass VDD to
PGND with a 0.1µF capacitor as close to each VDD pin
as possible. A low-impedance, high-current power-sup-
ply connection to VDD is assumed. Additional bulk
capacitance should be added as required depending on
the application and power-supply characteristics. AGND
and PGND should be star connected to system ground.
Refer to the MAX9714 Evaluation Kit for layout guidance.
Pin Configurations
TOP VIEW
PGND 1
PGND 2
VDD 3
VDD 4
C1N 5
C1P 6
CHOLD 7
N.C. 8
MAX9713
24 PGND
23 PGND
22 VDD
21 VDD
20 N.C.
19 FS2
18 FS1
17 N.C.
PGND 1
PGND 2
VDD 3
VDD 4
C1N 5
C1P 6
CHOLD 7
N.C. 8
MAX9714
24 PGND
23 PGND
22 VDD
21 VDD
20 FS2
19 FS1
18 G2
17 G1
TQFN (5mm x 5mm)
TQFN (7mm x 7mm)
Chip Information
MAX9713 TRANSISTOR COUNT: 3093
MAX9714 TRANSISTOR COUNT: 4630
PROCESS: BiCMOS
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