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参数资料
| 型号： | MAX9738EWP+TG45 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR MONO G 20WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | G 类 |
| 输出类型： | 1-通道（单声道） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 20-WLP |
| 封装/外壳： | 20-WFBGA，WLBGA |
| 包装： | 带卷 (TR) |
| 配用： | MAX9738EVKIT+-ND - KIT EVALUATION FOR MAX9738 |
MAX9738
Rectifier Diode Selection
The MAX9738’s high-switching frequency demands a
high-speed rectifier. Schottky diodes are recommend-
ed for most applications because of their fast recovery
time and low forward voltage. In general, a 1A to 2A
Schottky diode complements the internal MOSFET.
Ceramic Speaker Impedance
Characteristics
A 1μF capacitor is a good model for the ceramic
speaker as it best approximates the impedance of a
ceramic speaker over the audio band. When selecting
a capacitor to simulate a ceramic speaker, the capaci-
tor’s voltage rating must be equal to or higher than the
expected amplifier output voltage swing.
Series Load Resistor
The capacitive nature of the ceramic speaker results in
very low impedances at high frequencies. To prevent
the ceramic speaker from shorting the amplifier output
at high frequencies, a series load resistor must be
used. The output load resistor and the ceramic speaker
create a lowpass filter. To set the rolloff frequency of
the output filter, the approximate capacitance of the
speaker must be known. This information can be
obtained from bench testing or from the ceramic
speaker manufacturer. Set the lowpass filter cutoff fre-
quency with the following equation:
Increasing the value of RL decreases the amount of
high-frequency audio content sent to the speaker, but
improves the MAX9738’s power dissipation. Lowering
the value of RL burdens the amplifier output stage with
more power dissipation. An RL of 20Ω is a good com-
promise between power dissipation and frequency
response when coupled with a typical ceramic speaker.
WLP Applications Information
For the latest application details on WLP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow tempera-
ture profile, as well as the latest information on reliability
testing results, go to the Maxim website at www.maxim-
ic.com/ucsp for Application Note 1891:
UCSP—A
Wafer-Level Chip-Scale Package.
fLP
L
SPEAKER
Hz
=
××
()
1
2R
C
π
16VP-P Class G Amplifier with
Inverting Boost Converter
12
______________________________________________________________________________________
IMPEDANCE vs. FREQUENCY
MAX9738
fig04
FREQUENCY (Hz)
IMPEDANCE
(Ω
)
10
1
0.1
0.01
100
1k
10k
100k
1M
10
0.001
100
1
μF CAPACITOR
CERAMIC
SPEAKER
Figure 4. Ceramic Speaker and Capacitor Impedance
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX973C/D | 功能描述:校验器 IC RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX973CPA | 功能描述:校验器 IC RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX973CPA+ | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX973CSA | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX973CSA+ | 功能描述:校验器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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