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參數(shù)資料
| 型號(hào)： | MAX9726AETP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .124W STER 20TQFN |
| 標(biāo)準(zhǔn)包裝： | 75 |
| 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： | 124mW x 2 @ 16 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點(diǎn)： | 低音增強(qiáng)模式，消除爆音，I²C，靜音，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-TQFN-EP（4x4） |
| 封裝/外殼： | 20-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
Power-On Reset
The contents of the MAX9726’s command register at
power-on are as shown in Table 6.
Applications Information
Power Dissipation and Heatsinking
Linear power amplifiers can dissipate a significant
amount of power under normal operating conditions.
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 for the TQFN package is
+39°C/W.
If the power dissipation exceeds the rated package
dissipation, reduce VDD, increase load impedance,
decrease the ambient temperature, or add heatsinking.
Large output, supply, and ground traces decrease
θJA,
allowing more heat to be transferred from the package
to surrounding air.
Output Dynamic Range
Dynamic range is the difference between the noise
floor of the system and the output level at 1% THD+N. It
is essential that a system’s dynamic range be known
before setting the maximum output gain. Output clip-
ping occurs if the output signal is greater than the
dynamic range of the system. The DirectDrive architec-
ture of the MAX9726 has increased dynamic range (for
a given VDD) compared to other single-supply ampli-
fiers. Due to the absolute maximum ratings of the
MAX9726 and to limit power dissipation, the MAX9726
includes internal circuitry that limits the output voltage
to approximately ±2.5V.
Use the THD+N vs. Output Power graphs in the
Typical
Operating Characteristics section to identify the sys-
tem’s dynamic range. Find the output power that caus-
es 1% THD+N for a given load. This point indicates the
output power that causes the output to begin to clip.
Use the following equation to determine the peak-to-
peak output voltage that causes 1% THD+N for a given
load.
where POUT_1% is the output power that causes 1%
THD+N, RL is the load resistance, and VOUT(P-P) is the
peak-to-peak output voltage. Determine the voltage
gain (AV) necessary to attain this output voltage based
on the maximum peak-to-peak input voltage (VIN(P-P)):
The maximum voltage gain setting is determined by
external components (see the
Gain-Setting Components
section).
UVLO
The MAX9726 features an undervoltage lockout (UVLO)
function that prevents the device from operating if the
supply voltage is less than 2.7V. This feature ensures
proper operation during brownout conditions and pre-
vents deep battery discharge. Once the supply voltage
exceeds the UVLO threshold, the MAX9726 charge
pump is turned on and the amplifiers are powered, pro-
vided that SHDN is high and B7 in the command regis-
ter is set to 1.
Component Selection
Charge-Pump Capacitor Selection
Use ceramic capacitors with a low ESR for optimum
performance. For optimal performance over the extend-
ed temperature range, select capacitors with an X7R
dielectric.
Charge-Pump Flying Capacitor (C1)
The charge-pump flying capacitor connected between
C1N and C1P affects the charge pump’s load regula-
tion and output impedance. Choosing a flying capacitor
that is too small degrades the MAX9726’s ability to pro-
vide sufficient current drive and leads to a loss of out-
put voltage. Increasing the value of the flying capacitor
improves load regulation and reduces the charge-
pump output impedance. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance
graphs in the
Typical Operating Characteristics.
A
V
OUT P P
IN P P
=
()
VP
R
OUT P P
OUT
L
()
_ %
(
=×
22
1
P
TT
D MAX
J MAX
A
JA
()
=
θ
MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I2C, Volume and Gain Control
______________________________________________________________________________________
17
Table 6. Initial Power-Up Command Register Status
MODE
B7B6
B5B4B3
B2B1B0
Power-On Reset
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9726AETP+ | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX9726AETP+T | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX9726BEBP+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9726BEBP+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9726BETP+ | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
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