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| 型号： | MAX9737ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/13页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 13W MONO D 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 13W x 1 @ 4 欧姆 |
| 电源电压： | 8 V ~ 28 V |
| 特点： | 消除爆音，静音，短路保护和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | MAX9737ETG+TDKR |
When evaluating the MAX9737 with a ferrite bead filter
and resistive load, include a series inductor (68H for
8
Ω load and 33H for 4Ω load) to model typical loud-
speaker’s behavior. Omitting the series inductor
reduces the efficiency, the THD+N performance and
the output power of the MAX9737. When evaluating
with a loudspeaker, no series inductor is required.
Inductor-Based Output Filters
Some applications use the MAX9737 with a full induc-
tor/capacitor-based (LC) output filter. See Figure 4 for
the correct connections of these components.
The load impedance of the speaker determines the fil-
ter component selection (see Table 1).
Inductors L1 and L2 and capacitor C1 form the primary
output filter. Capacitors C2 and C3 provide common-
mode filtering to reduce radiated emissions. Capacitors
C4 and C5, plus resistors R1 and R2, form a Zobel at
the output. A Zobel corrects the output loading to com-
pensate for the rising impedance of the loudspeaker.
Without a Zobel, the filter exhibits peaking near the cut-
off frequency.
Component Selection
Gain-Setting Resistors
The output stage provides a fixed internal gain in addi-
tion to the externally set input stage gain. The fixed-out-
put stage gain is set at 13.6dB (4.8V/V). Set overall gain
by using resistors RF and RIN (Figure 5) as follows:
where AV is the desired voltage gain. Choose RF
between 10k
Ω and 50kΩ.
The PRE terminal is an operational amplifier output,
allowing the MAX9737 to be configured as a filter or an
equalizer.
Input Capacitor
An input capacitor, CIN, in conjunction with the input
resistor, RIN, of the MAX9737 forms a highpass filter
that removes the DC bias from an incoming signal. The
AC-coupling capacitor allows the amplifier to bias the
signal to an optimum DC level. Assuming negligible
source impedance, the -3dB point of the highpass filter
is given by:
Choose CIN such that f-3dB is well below the lowest fre-
quency of interest. To reduce low-frequency distortion,
use capacitors whose dielectrics have low-voltage
coefficients. Capacitors with high-voltage coefficients
cause increased distortion close to f-3dB. For best click-
and-pop suppression, use a 0.47F input capacitor.
COM Capacitor
COM is the output of the internally generated DC bias
voltage. Bypass COM with a 1F capacitor to AGND.
Regulator Capacitor
REG is the output of the internally generated DC bias
voltage. Bypass REG with a 1F capacitor to AGND.
Power Supplies
The MAX9737 features separate supplies for signal and
power portions of the device, allowing for the optimum
combination of headroom, power dissipation and noise
immunity. The speaker amplifiers are powered from
PVDD and can range from 8V to 28V. The remainder of
the device is powered by an internal 5V regulator, VS.
Internal Regulator
The MAX9737 features an internal 5V regulator, VS,
powered from PVDD. Bypass VS with a 1F capacitor to
AGND.
f
RC
dB
IN IN
-3
1
2
=
π
A
R
VV
V
F
IN
=
-4 8
./
MAX9737
Mono 7W Class D Amplifier
_______________________________________________________________________________________
9
MAX9737
R2
C5
C3
R1
C4
C2
L2
L1
RL
C1
Figure 4. LC Filter Configuration
MAX9737
AUDIO
INPUT
OUT+
OUT-
PRE
IN
COM
CCOM
PC
RIN
CIN
RF
Figure 5. Preamplifier Gain Configuration
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9737EVKIT+ | 功能描述:音频 IC 开发工具 MAX9737 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX9738EVKIT+ | 功能描述:放大器 IC 开发工具 MAX9738 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9738EWP+T | 制造商:Maxim Integrated Products 功能描述:16VP-P CLASS G AMPLIFIER WITH INVER - Tape and Reel |
| MAX9738EWP+TG45 | 功能描述:音频放大器 16VP-P Class G Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| 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 |
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