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PDF ( 数据手册 , 数据表 ) MY8008

零件编号 MY8008
描述 Stereo Filter Free Class D Audio Power Amplifier
制造商 Myland
LOGO Myland LOGO 


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MY8008 数据手册, 描述, 功能
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MY8008 pdf, 数据表
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MYLAND
Preliminary
MY8008
Rev.1.0 June 15, 2005
Pop-less
A soft start capacitor can be added to the CAP pin. This capacitor introduces delay for the
internal circuit to be stable before driving the load. The pop or click noise when power up/down
or switching in between shutdown mode can be thus eliminated. The delay time is proportional
to the value of the capacitance. It is about 500ms for a capacitor of 1uF at 5v.
Voltage gain
The voltage gain is defined in the table on page 3. For lower voltage gain one can add external
input resistors to input pins. If external resistors are used they should be well matched. Well
matched input resistors are also required even for single ended input configuration for low
noise.
Automatic output Power Control (APC)
The voltage gain is self adjusted in the chip over voltage range. This means that, regardless
supply voltage change, the output power keeps about the same for a given input level from
VDD=5.5v to 2.5v. It allows the best use of the battery.
Differential input VS single ended input
Differential input offers better noise immunity over single ended input. A differential input
amplifier suppresses common noise and amplifies the difference voltage at the inputs. For
single ended applications just tie the negative input end of the balanced input structure to
ground. If external input resistors are used, the negative input has to be grounded with a series
resistor of the same value as the positive input to reduce common noise.
Output filter
Ferrite bead filter can be used for EMI purpose. The ferrite filter reduces EMI around 1 MHz and
higherFCC and CE only test radiated emissions greater than 30 MHz. When selecting a
ferrite bead, choose one with high impedance at high frequencies, but low impedance at low
frequencies.
Use an LC output filter if there are low frequency(<1 MHzEMI sensitive circuits and/or there
are long wires from the amplifier to the speaker. EMI is also affected by PCB layout and the
placement of the surrounding components.
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