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| 型號： | MAX9820EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/13頁 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX9820 |
| 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® |
| 放大器類型： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 95mW x 2 @ 32 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | MAX9820 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | MAX9820ETB+TTR-ND - IC AMP AUD HDPHE 95MW 10TDFN |
GND (Figure 1). With no DC component, there is no
need for the large DC-blocking capacitors. The
MAX9820 charge pump requires two small ceramic
capacitors, conserving board space, reducing cost,
and improving the frequency response of the head-
phone amplifier.
Charge Pump
The MAX9820 features a low-noise charge pump. The
500kHz (typ) charge pump switching frequency is well
beyond the audio range and does not interfere with
audio signals.
Click-and-Pop Suppression
In conventional single-supply audio amplifiers, the out-
put-coupling capacitor contributes significantly to audi-
ble clicks and pops. Upon startup, the amplifier
charges the coupling capacitor to its bias voltage, typi-
cally half the supply. Likewise, on shutdown, the capac-
itor is discharged. This results in a DC shift across the
capacitor, which appears as an audible transient at the
speaker. Since DirectDrive biases the outputs at
ground, this problem does not arise. Additionally, the
MAX9820 features extensive click-and-pop suppres-
sion that eliminates any audible transient sources inter-
nal to the device.
RF Susceptibility
Modern audio systems are often subject to RF radiation
from sources such as wireless and cellular phone net-
works. Although the RF radiation is out of the audio
band, many signals, GSM signals in particular, contain
bursts or modulation at audible frequencies. Most ana-
log amplifiers demodulate the low-frequency envelope,
adding noise to the audio signal. The MAX9820 archi-
tecture addresses the RF susceptibility problem by
rejecting RF noise and preventing it from coupling into
the audio band.
MAX9820
DirectDrive Headphone Amplifier
with External Gain
_______________________________________________________________________________________
9
VOUT
CONVENTIONAL DRIVER OUTPUT WAVEFORMS
VDD
GND
VDD/2
VDD
VOUT
MAX9820 OUTPUT WAVEFORMS
VDD
-VDD
GND
2VDD
Figure 1. Conventional Driver Output Waveform vs. MAX9820
Output Waveform
RF IMMUNITY vs. FREQUENCY
MAX9820
fig02
FREQUENCY (GHz)
RF
IMMUNITY
(dBV)
2.45
1.90
1.35
-100
-80
-60
-40
-20
0
-120
0.8
3.00
LEFT CHANNEL
RIGHT CHANNEL
Figure 2. MAX9820 RF Susceptibility
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9820EVKIT+ | 功能描述:音頻 IC 開發(fā)工具 MAX9820 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 |
| MAX982CPA | 功能描述:校驗(yàn)器 IC Dual Comparator / Reference 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 |
| MAX982CPA+ | 功能描述:校驗(yàn)器 IC Dual Comparator / Reference 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 |
| MAX982CSA | 功能描述:校驗(yàn)器 IC Dual Comparator / Reference 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 |
| MAX982CSA+ | 功能描述:校驗(yàn)器 IC Dual Comparator / Reference 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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