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參數(shù)資料
| 型號(hào)： | MAX97002EWP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 27/37頁 |
| 文件大小： | 0K |
| 描述： | IC AUDIO SUBSYSTEM 20WLP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | DirectDrive® |
| 類型： | D 類 |
| 輸出類型： | 1-通道（單聲道），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： | 920mW x 1 @ 8 歐姆; 37mW x 2 @ 16 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，差分輸入，I²C，靜音，關(guān)閉，音量控制 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 20-WLP |
| 封裝/外殼： | 20-WFBGA，WLBGA |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | MAX97002EWP+TDKR |
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Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
MAX97002
33
Figure 12. Reading One Byte of Data from the MAX97002
Figure 13. Reading n-Bytes of Data from the MAX97002
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter to
recover the audio signal from the amplifier’s output. The
filters add cost, increase the solution size of the amplifier,
and can decrease efficiency and THD+N performance.
The traditional PWM scheme uses large differential out-
put swings (2 x VDD(P-P)) and causes large ripple cur-
rents. Any parasitic resistance in the filter components
results in a loss of power, lowering the efficiency.
The MAX97002 does not require an output filter. The
device relies on the inherent inductance of the speaker
coil and the natural filtering of both the speaker and
the human ear to recover the audio component of the
square-wave output. Eliminating the output filter results
in a smaller, less costly, more efficient solution.
Because the frequency of the MAX97002 output is well
beyond the bandwidth of most speakers, voice coil
movement due to the square-wave frequency is very
small. Although this movement is small, a speaker not
designed to handle the additional power can be dam-
aged. For optimum results, use a speaker with a series
inductance > 10FH. Typical 8I speakers exhibit series
inductances in the 20FH to 100FH range.
RF Susceptibility
GSM radios transmit using time-division multiple access
(TDMA) with 217Hz intervals. The result is an RF signal
with strong amplitude modulation at 217Hz and its har-
monics that are easily demodulated by audio amplifiers.
The MAX97002 is designed specifically to reject RF
signals; however, PCB layout has a large impact on the
susceptibility of the end product.
In RF applications, improvements to both layout and
component selection decreases the MAX97002’s sus-
ceptibility to RF noise and prevent RF signals from being
demodulated into audible noise. Trace lengths should
be kept below 1/4 of the wavelength of the RF frequency
of interest. Minimizing the trace lengths prevents them
from functioning as antennas and coupling RF signals
into the MAX97002. The wavelength (
l) in meters is
given by:
l = c/f
where c = 3 x 108 m/s, and f = the RF frequency of
interest.
Route the audio signals on the middle layers of the PCB
to allow the ground planes above and below to shield
them from RF interference. Ideally, the top and bottom
layers of the PCB should primarily be ground planes to
create effective shielding.
ACKNOWLEDGE FROM MAX97002
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
ACKNOWLEDGE FROM MAX97002
NOT ACKNOWLEDGE FROM MASTER
A
P
A
0
ACKNOWLEDGE FROM MAX97002
R/W
S
R/W
REPEATED START
Sr
1
SLAVE ADDRESS
REGISTER ADDRESS
SLAVE ADDRESS
DATA BYTE
ACKNOWLEDGE FROM MAX97002
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
ACKNOWLEDGE FROM MAX97002
A
A P
0
ACKNOWLEDGE FROM MAX97002
R/W
S
R/W
REPEATED START
Sr
1
SLAVE ADDRESS
REGISTER ADDRESS
SLAVE ADDRESS
DATA BYTE
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| MAX9701ETG+T | IC AMP AUDIO PWR 2.2W D 24TQFN |
| MAX9702ETI+T | IC AMP AUDIO PWR 1.8W D 28TQFN |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX97003EVKIT# | 功能描述:音頻 IC 開發(fā)工具 MAX97003 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX97003EWP+ | 制造商:Maxim Integrated Products 功能描述:AUDIO SUBSYSTEM - Rail/Tube |
| MAX97003EWP+T | 功能描述:音頻放大器 Audio Subsystem 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 |
| MAX9700AEBC | 制造商:Maxim Integrated Products 功能描述:1.2W LOW EMI FILTERLESS CLASS D - Rail/Tube |
| MAX9700AEBC+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 1.6W CLS-D 12UCSP - Rail/Tube |
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