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參數(shù)資料
| 型號： | MAX9830AEVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVALUATION FOR MAX9830 |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 系列： | * |
MAX9830
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter.
The filter adds cost, size, and decreases efficiency and
THD+N performance. The MAX9830’s filterless modula-
tion scheme does not require an output filter.
Because the switching frequency of the MAX9830 is
well beyond the bandwidth of most speakers, voice coil
movement at the switching frequency is very small. Use
a speaker with a series inductance > 10H. Typical 8
speakers exhibit series inductances in the 20H to
100H range.
Component Selection
Optional Ferrite Bead Filter
Although not normally needed, in applications where
speaker leads exceed 24in at VPVDD = 3V, use a filter
constructed from an inexpensive ferrite bead and a
small-value capacitor to ground (Figure 2) to provide
additional EMI suppression. Use a ferrite bead with low
DC resistance, high frequency (
≥ 1MHz) impedance of
100
to 600, and rated for at least 1A. The capacitor
value varies based on the ferrite bead chosen and the
actual speaker lead length. Select the capacitor value
based on EMI performance.
Speaker Amplifier Power Supply Input (PVDD)
PVDD powers the speaker amplifier. PVDD ranges from
2.6V to 5.5V. Bypass PVDD with a 0.1F capacitor to
PGND. Apply additional bulk capacitance at the device
if long input traces between PVDD and the power
source are used. Ensure a rate of voltage rise at PVDD
is limited to 1V/s.
Input Filtering
The input-coupling capacitor (CIN), in conjunction with
the amplifier’s internal input resistance (RIN), forms a
highpass filter that removes the DC bias from the
incoming signal. These capacitors allow the amplifier to
bias the signal to an optimum DC level. Select 0.47F
capacitors for optimum click-and-pop performance and
17Hz f-3dB.
If a different f-3dB is required, CIN, assuming zero-
source-impedance, is:
Use capacitors with adequately low voltage-coefficient
for best low-frequency THD performance.
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Good grounding improves audio perfor-
mance and prevents switching noise from coupling into
the audio signal.
Use wide, low-resistance output traces. As load imped-
ance decreases, the current drawn from the device out-
puts increase. At higher current, the resistance of the
output traces decrease the power delivered to the load.
For example, if 2W is delivered from the speaker output
to a 4
load through a 100m trace, 49mW is con-
sumed in the trace. If power is delivered through a
10m
trace, only 5mW is consumed in the trace. Wide
output, supply and ground traces also improve the
power dissipation of the device.
The MAX9830 is inherently designed for excellent RF
immunity. For best performance, add ground fills
around all signal traces on top and bottom PCB planes.
The MAX9830 TDFN package features an exposed
thermal pad on its underside. This pad lowers the pack-
age’s thermal resistance by providing a heat conduc-
tion path from the die to the PCB. Connect the exposed
thermal pad to the ground plane by using a large pad
and multiple vias.
Chip Information
PROCESS: CMOS
C
f
F
IN
dB
=
8
3
[]
-
Mono 2W Class D Amplifier
8
_______________________________________________________________________________________
MAX9830
OUT+
OUT-
Figure 2. Optional Ferrite Bead Filter
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9830AEVKIT+ | 功能描述:音頻 IC 開發(fā)工具 MAX9830A Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX9830ETA+T | 功能描述:音頻放大器 Integrated Circuits (ICs) Amplifiers - Audio - IC AMP MONO 2W CLASS D 8TDFN 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 |
| MAX98310EWL+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX98310EWL+T | 功能描述:音頻放大器 Speaker Amplifier 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 |
| MAX98311EWL+T | 功能描述:音頻放大器 Class AB Amplifier 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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