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參數(shù)資料
| 型號： | MAX9728BEUD+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 18/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .06W STER 14TSSOP |
| 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： | AB 類 |
| 輸出類型： | 耳機(jī)，2-通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 60mW x 2 @ 32 歐姆 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 包裝： | 帶卷 (TR) |
MAX9728A/MAX9728B
Since the MAX9728A/MAX9728B do not require output-
coupling capacitors, this problem does not arise.
Additionally, the MAX9728A/MAX9728B feature exten-
sive click-and-pop suppression that eliminates any
audible transient sources internal to the device.
Typically, the output of the device driving the
MAX9728A/MAX9728B has a DC bias of half the supply
voltage. At startup, the input-coupling capacitor is
charged to the preamplifier’s DC-bias voltage through
the input and feedback resistors of the MAX9728A/
MAX9728B, resulting in a DC shift across the capacitor
and an audible click/pop. Delay the rise of SHDN 4 to 5
time constants based on RIN and CIN, relative to the
startup of the preamplifier, to eliminate clicks-and-pops
caused by the input filter.
Shutdown
The MAX9728A/MAX9728B feature a < 0.1A, low-
power shutdown mode that reduces quiescent current
consumption and extends battery life for portable appli-
cations. Drive SHDN low to disable the amplifiers and
the charge pump. In shutdown mode, the amplifier out-
put impedance is set to 14k
Ω||RF (RF is 30kΩ for the
MAX9728B). The amplifiers and charge pump are
enabled once SHDN is driven high.
Applications Information
Power Dissipation
Under normal operating conditions, linear power ampli-
fiers can dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the
Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
where TJ(MAX) is +150°C, TA is the ambient tempera-
ture, and
θJA is the reciprocal of the derating factor in
°C/W as specified in the
Absolute Maximum Ratings
section. For example,
θJA of the Thin QFN package is
+68°C/W, and +110°C/W for the TSSOP package.
The MAX9728A/MAX9728B have two power dissipation
sources: a charge pump and the two output amplifiers.
If power dissipation for a given application exceeds the
maximum allowed for a particular package, reduce
VDD, increase load impedance, decrease the ambient
temperature, or add heatsinking to the device. Large
output, supply, and ground traces decrease
θJA, allow-
ing more heat to be transferred from the package to the
surrounding air.
Thermal-overload protection limits total power dissipa-
tion in the MAX9728A/MAX9728B. When the junction
temperature exceeds +150°C, the thermal-protection
circuitry disables the amplifier output stage. The ampli-
fiers are enabled once the junction temperature cools
by approximately 12°C. This results in a pulsing output
under continuous thermal-overload conditions.
Output Dynamic Range
Dynamic range is the difference between the noise floor
of the system and the output level at 1% THD+N.
Determine the system’s dynamic range before setting
the maximum output gain. Output clipping occurs if the
output signal is greater than the dynamic range of the
system. The DirectDrive architecture of the MAX9728A/
MAX9728B has increased the dynamic range compared
to other single-supply amplifiers.
Maximum Output Swing
Internal device structures limit the maximum voltage
swing of the MAX9728A/MAX9728B. The output must
not be driven such that the peak output voltage exceeds
the opposite supply voltage by 9V. For example, if VDD
= 5V, the charge pump sets PVSS = -5V. Therefore, the
peak output swing must be less than ±4V to prevent
exceeding the absolute maximum ratings.
Component Selection
Input-Coupling Capacitor
The input capacitor (CIN), in conjunction with the input
resistor (RIN), forms a highpass filter that removes the
DC bias from an incoming signal (see the
Functional
Diagram/Typical Operating Circuits). The AC-coupling
capacitor allows the device to bias the signal to an
optimum DC level. Assuming zero-source impedance,
the -3dB point of the highpass filter is given by:
Choose the CIN such that f-3dB is well below the lowest
frequency of interest. Setting f-3dB too high affects the
device’s low-frequency response. Use capacitors
whose dielectrics have low-voltage coefficients, such
as tantalum or aluminum electrolytic. Capacitors with
high-voltage coefficients, such as ceramics, can result
in increased distortion at low frequencies.
f
RC
dB
IN IN
=
3
1
2
π
P
TT
DISSPKG MAX
J MAX
A
JA
()
=
θ
60mW, DirectDrive, Stereo Headphone
Amplifiers with Shutdown
8
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參數(shù)描述 |
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| MAX9729ETI+ | 功能描述:音頻放大器 Stereo 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 |
| MAX9729ETI+T | 功能描述:音頻放大器 Stereo 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 |
| MAX9729EVCMAXQU+ | 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9729 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 |
| MAX9729EVKIT+ | 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9729 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 |
| MAX972C/D | 功能描述:校驗(yàn)器 IC 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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