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參數(shù)資料
| 型號(hào)： | MAX9879ERV+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier; Package: UCSP (R);30 pin;6 mm² ; Temperature: -40°C to +85°C |
| 中文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PBGA30 |
| 封裝： | 2.50 X 3 MM, 0.50 MM PITCH, ROHS COMPLAINT, UCSP-30 |
| 文件頁數(shù)： | 22/31頁 |
| 文件大小： | 539K |
| 代理商： | MAX9879ERV+ |
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MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
______________________________________________________________________________________
29
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 that is easily
demodulated by audio amplifiers. Figure 14 shows the
susceptibility of the MAX9879 to a transmitting GSM
radio placed in close proximity. Although there is mea-
surable noise at 217Hz and its harmonics, the noise is
well below the threshold of hearing using typical head-
phones.
In RF applications, improvements to both layout and
component selection decreases the MAX9879’s sus-
ceptibility to RF noise and prevent RF signals from
being demodulated into audible noise. Trace lengths
should be kept below 1/4 the wavelength of the RF fre-
quency of interest. Minimizing the trace lengths pre-
vents them from functioning as antennas and coupling
RF signals into the MAX9879. The wavelength
λ in
meters is given by:
λ = c/f
where c = 3 x 108 m/s, and f = the RF frequency of
interest.
Route audio signals on middle layers of the PCB to
allow ground planes above and below shield them from
RF interference. Ideally the top and bottom layers of the
PCB should primarily be ground planes to create effec-
tive shielding.
Additional RF immunity can also be obtained from rely-
ing on the self-resonant frequency of capacitors as it
exhibits the frequency response similar to a notch filter.
Depending on the manufacturer, 10pF to 20pF capaci-
tors typically exhibit self resonance at RF frequencies.
These capacitors, when placed at the input pins, can
effectively shunt the RF noise at the inputs of the
MAX9879. For these capacitors to be effective, they
must have a low-impedance, low-inductance path to
the ground plane. Do not use microvias to connect to
the ground plane as these vias do not conduct well at
RF frequencies.
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow tempera-
ture profile, as well as the latest information on reliability
testing results, refer to the Application Note 1891:
Understanding the Basics of the Wafer-Level Chip-
Scale Package (WL-CSP) on Maxim’s website at
www.maxim-ic.com/ucsp. See Figure 15 for the rec-
ommended PCB footprint for the MAX9879.
250
μm
45
±5μm
Figure 15. PCB Footprint Recommendation Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9879ERV+T | 功能描述:音頻放大器 Audio Subsystem w/DirectDrive 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 |
| MAX9879EVKIT+ | 功能描述:音頻放大器 Stereo Class D Audio Subsystem with DirectDrive Headphone 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX987ESA | 功能描述:校驗(yàn)器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX987ESA+ | 功能描述:校驗(yàn)器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX987ESA+T | 功能描述:校驗(yàn)器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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