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參數(shù)資料
| 型號： | MAX9702B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.8W, Filterless, Stereo, Class D Audio Power Amplifier and DirectDrive Stereo Headphone Amplifier |
| 中文描述： | 1.8W的，濾波，立體聲D類音頻功率放大器和DirectDrive立體聲耳機放大器 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 1411K |
| 代理商： | MAX9702B |
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M
BIAS Capacitor
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, C
BIAS
, 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 1μF 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 1μF, 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 CPV
SS
. 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
.
CPV
DD
Bypass Capacitor
The CPV
DD
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 CPV
DD
with C3 to PGND and place it
physically close to the CPV
DD
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 (CPV
DD
, V
DD
,
and PV
DD
) together. Bypass PV
DD
with a 0.1μF capaci-
tor to PGND and CPV
DD
with a 1μF capacitor to PGND.
Bypass V
DD
with 1μF capacitor to GND. Place the
bypass capacitors as close to the MAX9702 as possi-
ble. Place a bulk capacitor between PV
DD
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 allow more heat to move from the
MAX9702 to the air, decreasing the thermal impedance
of the circuit if possible or connect to V
SS
.
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 V
SS
.
Connect the exposed thermal pad to an isolated plane.
1.8W, Filterless, Stereo, Class D Audio Power
Amplifier and DirectDrive Stereo Headphone Amplifier
26
______________________________________________________________________________________
SUPPLIER
PHONE
800-348-2496
807-803-6100
FAX
WEBSITE
Taiyo Yuden
TDK
847-925-0899
847-390-4405
www.t-yuden.com
www.component.tdk.com
Table 8. Suggested Capacitor Manufacturers
相關PDF資料 |
PDF描述 |
|---|---|
| MAX9703 | Hex 2-Input OR Drivers 20-CDIP -55 to 125 |
| MAX9703-MAX9704 | 15W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers |
| MAX9703ETJ | 15W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers |
| MAX9704ETJ | 15W, Filterless, Spread-Spectrum Mono/Stereo Class D Amplifiers |
| MAX9711ETC | Synchronous 8-Bit Up/Down Counters 28-LCCC -55 to 125 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9702BETI+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH/SPKR 2CH STEREO 1.8W/0.045W CLS-AB/CLS-D 28TQFN - Rail/Tube |
| MAX9702BETI+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 28TQFN - Tape and Reel |
| MAX9702BEUI+ | 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 |
| MAX9702BEUI+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 |
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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