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參數(shù)資料
| 型號： | MAX9722BETE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO .13W STER AB 16TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 系列： | DirectDrive® |
| 類型： | AB 類 |
| 輸出類型： | 耳機，2-通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 130mW x 2 @ 32 歐姆 |
| 電源電壓： | 2.4 V ~ 5.5 V |
| 特點： | 消除爆音，差分輸入，短路和熱保護，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（3x3） |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
to the capacitive nature of the piezoelectric speaker, as
frequency increases, the speaker impedance decreas-
es, resulting in a larger current draw from the amplifier.
Furthermore, the capacitive nature of the speaker can
cause the MAX9722 to become unstable. In these
tests, the MAX9722 exhibited instabilities when driving
the WM-R57A. A simple inductor/resistor network in
series with the speaker isolates the speaker’s capaci-
tance from the amplifier, and ensures the device output
sees a resistive load of about 10Ω at high frequency
maintaining stability. Although the MAX9722 was not
stable with the WM-R57A, a different speaker with dif-
ferent characteristics may result in stable operation,
and elimination of the isolation components.
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 all components
associated with the charge pump (C2 and C3) to the
PGND plane. Connect PVDD and SVDD together at the
device. Connect PVSS and SVSS together at the device.
Bypassing of both supplies is accomplished by charge-
pump capacitors C2 and C3 (see the Typical Application
Circuit). Place capacitors C2 and C3 as close to the
device as possible. Route PGND and all traces that carry
switching transients away from SGND and the traces
and components in the audio signal path. Refer to the
MAX9722A Evaluation Kit for layout guidelines.
MAX9722A/MAX9722B
5V, Differential Input, DirectDrive, 130mW
Stereo Headphone Amplifiers with Shutdown
______________________________________________________________________________________
15
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9722
fig12
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.0001
0.001
0.01
0.1
1
10
100k
VDD = 5V
AV = -1V/V
VOUT(P-P) = 2V
OUTPUTS DRIVING
PIEZOELECTRIC SPEAKER
A
500mV/div
4μs/div
500mV/div
2μs/div
B
MAX9722A
INR
OUTR
INL
OUTL
AUDIO
INPUT
1μF 10kΩ
10kΩ
10Ω
100μH
Figure 12. MAX9722 THD+N vs. Frequency
Figure 13. MAX9722 Capacitive-Load Stability Waveform:
(a) Falling Edge, (b) Rising Edge
Figure 14. Isolation Network Improves Stability
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9722BEUE | 制造商:Maxim Integrated Products 功能描述:5V, DIFFERENTIAL INPUT, DIRECTDRIVE, 130MW ST - Bulk |
| MAX9722BEUE+ | 功能描述:音頻放大器 DirectDrive 130mW 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9722BEUE+T | 功能描述:音頻放大器 DirectDrive 130mW 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX97236EVKIT# | 功能描述:放大器 IC 開發(fā)工具 MAX97236 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX97236EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX97236 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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