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参数资料
| 型号： | MAX9768EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9768 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 放大器类型： | 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： | 10W x 1 @ 8 欧姆 |
| 电源电压： | 4.5 V ~ 14 V |
| 工作温度： | -40°C ~ 85°C |
| 板类型： | 完全填充 |
| 已用 IC / 零件： | MAX9768 |
| 已供物品： | 板 |
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
22
______________________________________________________________________________________
Power Supplies
The MAX9768 has different supplies for each portion 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 4.5V to 14V. The remainder of the device is
powered by VDD. Power supplies are independent of
each other so sequencing is not necessary. Power may
be supplied by separate sources or derived from a sin-
gle higher source using a linear regulator to reduce the
voltage as shown in Figure 10.
Component Selection
Input Filter
An input capacitor, CIN, in conjunction with the input
resistor of the MAX9768 forms a highpass filter that
removes the DC bias from an incoming signal. The AC-
coupling capacitor allows the amplifier to automatically
bias the signal to an optimum DC level. Assuming zero
source impedance, the -3dB point of the highpass filter
is given by:
Choose CIN so f-3dB is well below the lowest frequency
of interest. Use capacitors whose dielectrics have low-
voltage coefficients, such as tantalum or aluminum elec-
trolytic. Capacitors with high-voltage coefficients, such
as ceramics, may result in increased distortion at low fre-
quencies.
Other considerations when designing the input filter
include the constraints of the overall system and the
actual frequency band of interest. Although high-fidelity
audio calls for a flat-gain response between 20Hz and
20kHz, portable voice-reproduction devices such as cel-
lular phones and two-way radios need only concentrate
on the frequency range of the spoken human voice (typi-
cally 300Hz to 3.5kHz). In addition, speakers used in
portable devices typically have a poor response below
300Hz. Taking these two factors into consideration, the
input filter may not need to be designed for a 20Hz to
20kHz response, saving both board space and cost due
to the use of smaller capacitors.
BIAS Capacitor
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, CBIAS, improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node. Bypass
BIAS with a 2.2F capacitor to GND.
Supply Bypassing, Layout, and Grounding
Proper layout and grounding are essential for optimum
performance. Use large traces for the power-supply
inputs and amplifier outputs to minimize losses due to
parasitic trace resistance. Large traces also aid in mov-
ing heat away from the package. Proper grounding
improves audio performance, minimizes crosstalk
between channels, and prevents any switching noise
from coupling into the audio signal. Connect PGND and
GND together at a single point on the PCB. Route all
traces that carry switching transients away from GND
and the traces/components in the audio signal path.
Bypass VDD and PVDD with a 1F capacitor to PGND.
Place the bypass capacitors as close to the MAX9768
as possible. Place a bulk capacitor between PVDD and
PGND, if needed.
Use large, low-resistance output traces. Current drawn
from the outputs increase as load impedance decreas-
es. High output trace resistance decreases the power
delivered to the load. Large output, supply, and GND
traces allow more heat to move from the MAX9768 to
the air, decreasing the thermal impedance of the circuit
if possible.
f
dB
IN IN
RC
=
3
1
2
π
GND
MAX9768
SHDN
OUT
3.3V
VDD
PVDD
IN
1
μF
MAX1726
12V
1
μF
Figure 10. Using a Linear Regulator to Produce 3.3V from a
12V Power Supply
BOOT+
OUT+
AUDIO
INPUT
MAX9768
CIN
BOOT-
OUT-
IN
FB
RIN
RF
Figure 9. Setting Gain
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9768EVKIT+ | 功能描述:音频 IC 开发工具 MAX9768 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 |
| MAX976ESA | 功能描述:校验器 IC Dual High Speed Comparator 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 |
| MAX976ESA+ | 功能描述:校验器 IC Dual High Speed Comparator 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 |
| MAX976ESA+T | 功能描述:校验器 IC Dual High Speed Comparator 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 |
| MAX976ESA-T | 功能描述:校验器 IC Dual High Speed Comparator 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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