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| 型號(hào)： | MAX9877EWP+TG45 |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 13/30頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AUDIO SUBSYSTEM 20-WLP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | 825mW x 1 @ 4 歐姆; 53mW x 2 @ 16 歐姆 |
| 電源電壓： | 2.7 V ~ 5.25 V |
| 特點(diǎn)： | 消除爆音，I²C，輸入多路復(fù)用器，短路和熱保護(hù)，關(guān)機(jī)，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： | 帶卷 (TR) |
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MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
20
______________________________________________________________________________________
1) The sleeve is typically grounded to the chassis.
Using the midrail biasing approach, the sleeve
must be isolated from system ground, complicating
product design.
2) During an ESD strike, the amplifier’s ESD structures
are the only path to system ground. Thus, the
amplifier must be able to withstand the full energy
from an ESD strike.
3) When using the headphone jack as a line out to
other equipment, the bias voltage on the sleeve
may conflict with the ground potential from other
equipment, resulting in possible damage to the
amplifiers.
The MAX9877 features a low-noise charge pump. The
switching frequency of the charge pump is 1/2 of the
Class D switching frequency, regardless of the operating
mode. When the Class D amplifiers are operated in
spread-spectrum mode, the charge pump also switches
with a spread-spectrum pattern. The nominal switching
frequency is well beyond the audio range, and thus does
not interfere with audio signals. The switch drivers fea-
ture a controlled switching speed that minimizes noise
generated by turn-on and turn-off transients. By limiting
the switching speed of the charge pump, the di/dt noise
caused by the parasitic trace inductance is minimized.
Although not typically required, additional high-frequen-
cy noise attenuation can be achieved by increasing the
size of C2 (see the
Typical Application Circuit). The
charge pump is active only in headphone modes.
Headphone Current Limit
The headphone amplifier current is limited to 140mA (typ).
The current limit clamps the output current, which appears
as clipping when the maximum current is exceeded.
Shutdown Mode
The MAX9877 features two ways of entering low-power
shutdown. The hardware shutdown function is controlled
by pulsing BIAS low for 1ms. While BIAS is low the ampli-
fiers are shut down. Following an 80ms reset period, the
MAX9877 reverts to its power-on-reset condition. Pull
BIAS low using an open-drain output that is not pulled up
with a resistor (see the
Typical Application Circuit). The
open-drain output leakage must not exceed 100nA and
must be able to sink at least 1mA.
The device can also be placed in shutdown mode by
writing to the SHDN bit in the Output Control Register.
Click-and-Pop Suppression
The MAX9877 features click-and-pop suppression that
eliminates audible transients from occurring at startup
and shutdown.
Use the following procedure to start up the MAX9877:
1) Configure the desired output mode and pream-
plifier gain.
2) Set the SHDN bit to 1 to start up the amplifier.
3) Wait 10ms for the startup time to pass.
4) Increase the output volume to the desired level.
To disable the device simply set SHDN to 0.
During the startup period, the MAX9877 precharges the
input capacitors to prevent clicks and pops. If the output
amplifiers have been programmed to be active they are
held in shutdown until the precharge period is complete.
When power is initially applied to the MAX9877, the
power-on-reset state of all three volume control registers
is mute. For most applications, the volume can be set to
the desired level once the device is active. If the click-
and-pop is too high, step through intermediate volume
settings with zero-crossing detection disabled. Stepping
through higher volume settings has a greater impact on
click-and-pop than lower volume settings.
For the lowest possible click-and-pop, start up the device
at minimum volume and then step through each volume
setting until the desired setting is reached. Disable zero-
crossing detection if no input signal is expected.
VDD
VDD/2
GND
CONVENTIONAL AMPLIFIER BIASING SCHEME
DirectDrive AMPLIFIER BIASING SCHEME
+VDD
GND
-VDD
(VSS)
Figure 5. Traditional Amplifier Output vs. MAX9877 DirectDrive
Output
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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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