MAX9716(2004) 데이터 시트보기 (PDF) - Maxim Integrated
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MAX9716 Datasheet PDF : 19 Pages
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Low-Cost, Mono, 1.4W BTL Audio Power
Amplifiers
220pF
VCC
VCC
RF
20kΩ
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
SHDN
ON
OFF
BIAS
CBIAS
OUT-
CIN
0.33µF
AUDIO
INPUT
CIN
0.33µF
AUDIO
INPUT
RIN
20kΩ
RIN
20kΩ
20kΩ
IN+
20kΩ
OUT+
IN-
GND
MAX9716
VALUES SHOWN FOR 0dB GAIN.
Figure 4. MAX9716 Differential Input
BIAS Capacitor
BIAS is the output of the internally-generated VCC/2 bias
voltage. The BIAS bypass capacitor, CBIAS, improves the
power-supply rejection ratio by reducing power supply
and other noise sources at the common-mode bias node.
CBIAS also generates the clickless/popless startup DC
bias waveform for the speaker amplifiers. Bypass BIAS
with a 1µF capacitor to GND. Larger CBIAS values
improve PSRR but slow down tON time. Do not connect
external loads to BIAS.
Supply Bypassing
Proper power-supply bypassing ensures low-noise,
low-distortion performance. Connect a 1µF ceramic
capacitor from VCC to GND. Add additional bulk
capacitance as required by the application. Connect
the bypass capacitor as close to the device as possible.
RF
20kΩ
220pF
Layout and Grounding
Proper PC board layout and grounding is essential for
optimizing performance. Use large traces for the
power-supply inputs and amplifier outputs to minimize
losses due to parasitic trace resistance. Large traces
also aid in moving heat away from the package. Proper
grounding improves audio performance and prevents
digital switching noise from coupling into the audio signal.
The MAX9716/MAX9717 TDFN and µMAX packages
feature exposed thermal pads on their undersides. This
pad lowers the thermal resistance of the package by
providing a direct-heat conduction path from the die to
the printed circuit board. Connect the exposed pad to
the ground plane using multiple vias, if required.
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