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參數(shù)資料
| 型號： | 5962-9452702M2C |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | DAC |
| 英文描述： | QUAD, SERIAL INPUT LOADING, 8-BIT DAC, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 337K |
| 代理商： | 5962-9452702M2C |
MAX9715
2.8W, Low-EMI, Stereo, Filterless Class D
Audio Amplifier
_______________________________________________________________________________________
9
Voice coil movement due to the square-wave frequency
is very small because the switching frequency of the
MAX9715 is well beyond the bandwidth of most speak-
ers. Although this movement is small, a speaker not
designed to handle the additional power may be
damaged. Use a speaker with a series inductance
> 30μH for optimum efficiency. Typical 8
Ω speakers
exhibit series inductances in the 30μH to 100μH range.
The highest efficiency is achieved with speaker induc-
tances > 60μH.
Component Selection
Input Filter
The input capacitor (CIN), in conjunction with the amplifier
input resistance (RIN), forms a highpass filter that
removes the DC bias from an incoming signal (see the
Typical Application Circuit). The AC-coupling capacitor
allows the amplifier to bias the signal to an optimum DC
level. Assuming zero source impedance, the -3dB point
of the highpass filter is given by:
RIN is the amplifier’s internal input resistance value given
in the
Electrical Characteristics table. Choose CIN so
f-3dB is well below the lowest frequency of interest.
Setting f-3dB too high affects the amplifier’s low-frequency
response. Use capacitors with low-voltage coefficient
dielectrics, such as tantalum or aluminum electrolytic.
Capacitors with high-voltage coefficients, such as ceram-
ics, may result in increased distortion at low frequencies.
The inability of small diaphragm speakers to reproduce
low frequencies can be exploited to improve click-and-
pop performance. Set the cutoff frequency of the
MAX9715’s input highpass filter to match the speaker’s
frequency response. Doing so will allow for smaller CIN
values and reduce click-and-pop.
Output Filter
The MAX9715 speaker amplifiers do not require output
filters. However, output filtering can be used if a design
is failing radiated emissions due to board layout, cable
length, or the circuit is near EMI-sensitive devices. Use
a ferrite bead filter or a common-mode choke when radi-
ated frequencies above 10MHz are of concern. Use an
LC filter when radiated frequencies below 10MHz are of
concern, or when long cables (>75mm) connect the
amplifier to the speaker. Figure 4 shows possible output
filter connections.
f
RC
dB
IN
=
××
3
1
2
π
MAX9715
OUTL+
OUTL-
OUTR+
OUTR-
MAX9715
OUTL+
OUTL-
OUTR+
OUTR-
MAX9715
OUTL+
OUTL-
OUTR+
OUTR-
(a)
TYPICAL APPLICATION
<75mm OF SPEAKER CABLE.
(b)
COMMON-MODE CHOKE FOR
APPLICATIONS USING CABLE LENGTHS
GREATER THAN 150mm.
(c)
LC FILTER WHEN USING LONG CABLE
LENGTHS OR IN APPLICATIONS
THAT ARE SENSITIVE TO EMI.
Figure 4. Optional Speaker Amplifier Output Filter—Guidelines for FCC Compliance
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 5962-9452702MEA | 功能描述:數(shù)模轉(zhuǎn)換器- DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| 5962-9453001M2A | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| 5962-9453001MEA | 制造商:Texas Instruments 功能描述:Current Mode PWM Controller 1.5A 16-Pin CDIP Tube 制造商:Texas Instruments 功能描述:CURRENT MODE PWM CNTRLR 1.5A 16CDIP - Rail/Tube |
| 5962-9453001Q2A | 制造商:Texas Instruments 功能描述:ADV CUR MODE PWM, UC1856L20883B, 20 PIN - Rail/Tube |
| 5962-9453201MXA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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