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參數(shù)資料
| 型號(hào)： | MAX9725CETC+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .025W STER 12TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 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： | 25mW x 2 @ 16 歐姆 |
| 電源電壓： | 900 mV ~ 1.8 V |
| 特點(diǎn)： | 消除爆音，短路保護(hù)，關(guān)機(jī) |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 12-TQFN-EP（4x4） |
| 封裝/外殼： | 12-WQFN 裸露焊盤 |
| 包裝： | 管件 |
MAX9725
Component Selection
Input Filtering
The AC-coupling capacitor (CIN) and an internal gain-
setting resistor form a highpass filter that removes any
DC bias from an input signal (see the
Functional
Diagrams). CIN allows the MAX9725A–MAX9725D to
bias the signal to an optimum DC level. The -3dB point
of the highpass filter, assuming zero source imped-
ance, is given by:
Choose CIN so f-3dB is well below the lowest frequency of
interest. RIN for the MAX9725A–MAX9725D is 25kΩ and a
minimum of 10kΩ for the MAX9725E. Setting f-3dB too
high affects the amplifier’s low-frequency response. Use
capacitors with low-voltage coefficient dielectrics. Film or
C0G dielectric capacitors are good choices for AC-cou-
pling capacitors. Capacitors with high-voltage coeffi-
cients, such as ceramics, can result in increased
distortion at low frequencies.
Charge-Pump Capacitor Selection
Use capacitors with less than 100mΩ of ESR. Low-ESR
ceramic capacitors minimize the output impedance of the
charge pump. Capacitors with an X7R dielectric provide
the best performance over the extended temperature
range. Table 1 lists suggested capacitor manufacturers.
Flying Capacitor (C1)
The value of C1 affects the charge pump’s load regula-
tion and output impedance. Choosing C1 too small
degrades the MAX9725’s ability to provide sufficient
current drive and leads to a loss of output voltage.
Increasing the value of C1 improves load regulation
and reduces the charge-pump output impedance. See
the Output Power vs. Charge-Pump Capacitance and
Load Resistance graph in the
Typical Operating
Characteristics.
Hold Capacitor (C2)
The hold capacitor’s value and ESR directly affect the
ripple at PVSS. Increasing the value of C2 reduces rip-
ple. Choosing a capacitor with lower ESR reduces rip-
ple and output impedance. Lower capacitance values
can be used in systems with low maximum output
power levels. See the Output Power vs. Charge-Pump
Capacitance and Load Resistance graph in the
Typical
Operating Characteristics.
Power-Supply Bypass Capacitor (C3)
The power-supply bypass capacitor (C3) lowers the
output impedance of the power supply and reduces the
impact of the MAX9725’s charge-pump switching tran-
sients. Bypass VDD to PGND with the same value as
C1. Place C3 as close to VDD as possible.
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Connect PGND and SGND together at a
single point on the PC board. Connect PVSS to SVSS
and bypass with C2 to PGND. Bypass VDD to PGND
with C3. Place capacitors C2 and C3 as close to the
MAX9725 as possible. Route PGND, and all traces that
carry switching transients, away from SGND and the
audio signal path.
The MAX9725 does not require additional heatsinking.
The thin QFN package features an exposed paddle that
improves thermal efficiency of the package. Ensure the
exposed paddle is electrically isolated from GND and
VDD. Connect the exposed paddle to VSS if necessary.
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, printed circuit
board techniques, bump-pad layout , and recommend-
ed reflow temperature profile, as well as the latest infor-
mation on reliability testing results, go to Maxim’s
website at www.maxim-ic.com/ucsp for the
Application Note 1891:
Wafer-Level Packaging (WLP)
and Its Applications.
f
2C
-3dB
IN
=
××
1
π
RIN
Table 1. Suggested Capacitor Manufacturers
SUPPLIER
PHONE
FAX
WEBSITE
Murata
770-436-1300
—
www.murata.com
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
______________________________________________________________________________________
11
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| MAX9725CETC+ | 功能描述:音頻放大器 1V 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 |
| MAX9725CETC+T | 功能描述:音頻放大器 1V 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 |
| MAX9725CETC-T | 功能描述:音頻放大器 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 |
| MAX9725DEBC | 制造商:Maxim Integrated Products 功能描述:1V LOW-POWER DIRECTDRIVE STEREO - Rail/Tube |
| MAX9725DEBC+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.025W CLS-AB 12UCSP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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