voltage. The BIAS bypass capacitor, C
參數(shù)資料
型號(hào)： MAX9702ETI+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 19/31頁(yè)
文件大小： 0K
描述： IC AMP AUDIO PWR 1.8W D 28TQFN
標(biāo)準(zhǔn)包裝： 60
系列： DirectDrive®
類型： D 類
輸出類型： 2-通道（立體聲）帶立體聲耳機(jī)
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 1.8W x 2 @ 4 歐姆; 45mW x 2 @ 32 歐姆
電源電壓： 2.5 V ~ 5.5 V
特點(diǎn)： 消除爆音，差分輸入，I²C，靜音，短路和熱保護(hù)，關(guān)機(jī)
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 28-TQFN-EP（5x5）
封裝/外殼： 28-WFQFN 裸露焊盤(pán)
包裝： 管件
MAX9702
BIAS Capacitor
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, CBIAS, improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the clickless/popless, startup/shutdown
DC bias waveforms for the speaker amplifiers. Bypass
BIAS with a 1F capacitor to GND.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100m
for opti-
mum performance. Low-ESR ceramic capacitors mini-
mize the output resistance of the charge pump. Most
surface-mount ceramic capacitors satisfy the ESR
requirement. For best performance over the extended
temperature range, select capacitors with an X7R
dielectric. Table 8 lists suggested manufacturers.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the output
resistance of the charge pump. A C1 value that is too
small degrades the device’s ability to provide sufficient
current drive, which leads to a loss of output voltage.
Increasing the value of C1 reduces the charge-pump out-
put resistance to an extent. Above 1F, the on-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 CPVSS. Increasing the value of 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. See the Output Power
vs. Charge-Pump Capacitance and Load Resistance
graph in the Typical Operating Characteristics.
CPVDD Bypass Capacitor
The CPVDD bypass capacitor (C3) lowers the output
impedance of the power supply and reduces the
impact of the MAX9702’s charge-pump switching tran-
sients. Bypass CPVDD with C3 to PGND and place it
physically close to the CPVDD and PGND. Use a value
for C3 that is equal to C1.
Supply Bypassing, Layout,
and Grounding
Proper layout and grounding are essential for optimum
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 mov-
ing heat away from the package. Proper grounding
improves audio performance, minimizes crosstalk
between channels, and prevents any switching noise
from coupling into the audio signal. Connect PGND and
GND together at a single point on the PC board. Route
all traces that carry switching transients away from GND
and the traces/components in the audio signal path.
Connect all of the power-supply inputs (CPVDD, VDD,
and PVDD) together. Bypass PVDD with a 0.1F capaci-
tor to PGND and CPVDD with a 1F capacitor to PGND.
Bypass VDD with 1F capacitor to GND. Place the
bypass capacitors as close to the MAX9702 as possi-
ble. Place a bulk capacitor between PVDD and PGND,
if needed.
Use large, low-resistance output traces. Current drawn
from the outputs increases as load impedance
decreases. High-output trace resistance decreases the
power delivered to the load. Large output, supply, and
GND traces decrease the thermal impedance of the
system, allowing more heat to move from the MAX9702
to the air.
The MAX9702 thin QFN-EP package features an
exposed thermal pad on its underside. This pad lowers
the package’s thermal impedance by providing a
direct-heat conduction path from the die to the printed
circuit board. The exposed pad is internally connected
to VSS. Connect the exposed pad to an isolated
plane if possible or to VSS.
1.8W, Filterless, Stereo, Class D Audio Power
Amplifier and DirectDrive Stereo Headphone Amplifier
26
______________________________________________________________________________________
SUPPLIER
PHONE
FAX
WEBSITE
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
807-803-6100
847-390-4405
www.component.tdk.com
Table 8. Suggested Capacitor Manufacturers
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9702ETI+ 功能描述:音頻放大器 1.8W Filterless Class D Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9702ETI+T 功能描述:音頻放大器 1.8W Filterless Class D Audio Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9702EUI+ 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH/SPKR 2CH STEREO 1.8W/0.045W CLS-AB/CLS-D 28TSSO - Rail/Tube
MAX9702EUI+T 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH/SPKR 2CH STEREO 1.8W/0.045W CLS-AB/CLS-D 28TSSO - Tape and Reel
MAX9702EVCMODU 功能描述:放大器 IC 開(kāi)發(fā)工具 MAX9702/2B Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
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