參數(shù)資料
型號(hào)： MAX9729ETI+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 9/28頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO .052W STER 28TQFN
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： 52mW x 2 @ 32 歐姆
電源電壓： 1.8 V ~ 3.6 V
特點(diǎn)： 帶低音增強(qiáng)模式，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： 28-TQFN-EP（5x5）
封裝/外殼： 28-WFQFN 裸露焊盤
包裝： 帶卷 (TR)
Power-On Reset
The MAX9729 features internal power-on reset (POR)
circuitry that initializes the device upon power-up. The
contents of the MAX9729’s command registers at
power-on are shown in Table 9.
Applications Information
Power Dissipation and Heat Sinking
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 temperature,
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 thin QFN package is +35°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 will occur if the output signal is greater than the
dynamic range of the system. The DirectDrive architec-
ture of the MAX9729 has increased dynamic range (for
a given VDD) compared to other single-supply ampli-
fiers. Due to the absolute maximum ratings of the
MAX9729 and to limit power dissipation, the MAX9729
includes internal circuitry that limits the output voltage
to approximately ±2.5V.
Use the THD+N vs. Output Power graph in the
Typical
Operating Characteristics to identify the system’s
dynamic range. Find the output power that causes 1%
THD+N for a given load. This point will indicate what
output power 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 total volt-
age gain (AV_TOTAL) necessary to attain this output
voltage based on the maximum peak-to-peak input
voltage (VIN_(P-P)):
The AV_TOTAL setting is determined by the maximum
voltage gain setting, volume setting, and bass boost
gain if BassMax is enabled (see the
Maximum Gain
Control, Volume Control, and BassMax Gain-Setting
Components sections).
UVLO
The MAX9729 features an undervoltage lockout (UVLO)
function that prevents the device from operating if the
supply voltage is less than 1.65V. This feature ensures
proper operation during brownout conditions and pre-
vents deep battery discharge. Once the supply voltage
exceeds the UVLO threshold, the MAX9729 charge
pump is turned on, the amplifiers are powered (provid-
ed that
SHDN is high), and the command registers are
reset to their POR values (see Table 9).
Component Selection
Charge-Pump Capacitor Selection
Use ceramic capacitors with a low ESR for optimum perfor-
mance. For optimal performance over the extended tem-
perature range, select capacitors with an X7R dielectric.
A
V
V TOTAL
OUT P P
IN P P
_
_(
)
_(
)
=
VP
R
OUT P P
OUT
L
_(
)
_ %
()
=×
22
1
P
TT
D MAX
J MAX
A
JA
()
=
θ
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
______________________________________________________________________________________
17
B6
B5
OUTL
OUTR
0
INL1 x AV_TOTAL
INR1 x AV_TOTAL
0
1
INL2 x AV_TOTAL
INR2 x AV_TOTAL
1
0
INL3 x AV_TOTAL
INR3 x AV_TOTAL
1
(INL1 + INL2 + INL3) x AV_TOTAL
(INR1 + INR2 + INR3) x AV_TOTAL
Table 4. Multiplexer/Mixer Control (Register 0x00)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
MAX972CPA 功能描述:校驗(yàn)器 IC Dual 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
MAX972CPA+ 功能描述:校驗(yàn)器 IC Dual 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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