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参数资料
| 型号： | MAX8678EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX8678 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 24mA |
| 输出及类型： | 4，非隔离 |
| 特点： | 可调光，带单声道 1.1W 级 AB 音频放大器 |
| 输入电压： | 2.7 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX8678 |
White LED Charge Pump with
1.1W Audio Amplifier
Serial-Pulse Gain Adjustment (ENAMP)
The audio amplifier has an internal gain adjustment,
Table 3. Audio Amplifier-Input Impedance
controlled by a serial-pulse interface. The gain setting
of the input amplifier is adjustable from -9dB to +18dB
ENAMP
RISING
GAIN
SETTING
R IN (k Ω )
in 3dB steps. This allows the amplifier to be used for
both hands-free and for receiver mode, without any
external components.
Driving ENAMP high turns on the amplifier and sets the
internal register to -9dB. Adjust the gain by pulsing
ENAMP low (500ns to 500μs pulse width). Each rising
edge sets the gain as shown in Table 3. Once the
desired setting is reached, hold ENAMP high for at
least 3.2ms to set the internal register and change the
gain. To set a new current level, repeat the previous
sequence from the beginning. To shut down the ampli-
fier, hold ENAMP low for at least 3.2ms. Figure 3 is a
timing diagram for ENAMP.
EDGES
1
2
3
4
5
6
7
8
9
10
(dB)
-9
-6
-3
0
3
6
9
12
15
18
MIN
69.1
62.4
54.9
46.8
38.8
31.3
24.6
18.8
14.1
10.5
TYP
99.0
89.2
78.4
66.9
55.5
44.7
35.1
26.9
20.2
15.0
MAX
140.0
116.0
102.0
87.0
72.1
58.1
45.6
35.0
26.2
19.5
Applications Information
BTL Amplifier
The MAX8678 is designed to drive a load differentially,
a configuration referred to as bridge-tied load (BTL).
The BTL configuration offers advantages over the sin-
gle-ended configuration, where one side of the load is
connected to ground. Driving the load differentially
doubles the output voltage, thus quadrupling output
power compared to a single-ended amplifier under
similar configurations.
Since the differential outputs are biased at midsupply,
there is no net DC voltage across the load. This elimi-
nates the need for DC-blocking capacitors required for
single-ended amplifiers. These capacitors can be
large, expensive, consume board space, and degrade
low-frequency performance.
A+
R IN
MAX8678
OUT+
DIFFERENTIAL
AUDIO INPUT
A-
MONO
CLASS AB
AUDIO AMP
OUT-
EARPIECE /
LOUDSPEAKER
R IN
OPTIONAL FILTER
CAPACITORS
Figure 4. Differential Audio Input with Optional Filter Capacitors
SINGLE-ENDED
A+
R IN
MAX8678
OUT+
AUDIO INPUT
A-
MONO
CLASS AB
AUDIO AMP
OUT-
EARPIECE /
LOUDSPEAKER
R IN
NOTE: FILTER CAPACITORS REQUIRED FOR SINGLE-ENDED AUDIO OUTPUT.
Figure 5. Single-Ended Audio Input
10
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相关代理商/技术参数 |
参数描述 |
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| MAX8678EVKIT+ | 功能描述:电源管理IC开发工具 MAX8678 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX867C/D | 功能描述:直流/直流开关转换器 Adjustable Output Single-Cell DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX867ESA | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX867ESA+ | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX867ESA+T | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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