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參數資料
| 型號： | MAX9730EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 11/12頁 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9730 |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 放大器類型： | G 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數量： | 2.4W x 1 @ 8 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 板類型： | 完全填充 |
| 已用 IC / 零件： | MAX9730 |
| 已供物品： | 板 |
MAX9730
2.4W, Single-Supply, Class G Power Amplifier
8
_______________________________________________________________________________________
Utilizing a Class G output stage with an inverting
charge pump allows the MAX9730 to realize a 2.4W
output power with a 5V supply.
The theoretical best efficiency of a linear amplifier is
78%; however, that efficiency is only exhibited at peak
output powers. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9730 still exhibits 50% efficiency
under the same conditions.
Inverting Charge Pump
The MAX9730 features an integrated charge pump with
an inverted supply rail that can supply greater than
700mA over the positive 2.7V to 5.5V supply range. In
the case of the MAX9730, the charge pump generates
the negative supply rail (PVSS) needed to create the
higher supply range, which allows the output of the
device to operate over a greater dynamic range as the
battery supply collapses over time.
Shutdown Mode
The MAX9730 has a shutdown mode that reduces
power consumption and extends battery life. Driving
SHDN low places the MAX9730 in a low-power (0.3A)
shutdown mode. Connect
SHDN to VCC for normal
operation.
Click-and-Pop Suppression
The MAX9730 Class G amplifier features Maxim’s com-
prehensive, industry-leading click-and-pop suppres-
sion. During startup, the click-and-pop suppression
circuitry eliminates any audible transient sources inter-
nal to the device.
Applications Information
Differential Input Amplifier
The MAX9730 features a differential input configuration,
making the device compatible with many CODECs, and
offering improved noise immunity over a single-ended
input amplifier. In devices such as PCs, noisy digital
signals can be picked up by the amplifier’s input
traces. The signals appear at the amplifiers’ inputs as
common-mode noise. A differential input amplifier
amplifies the difference of the two inputs, and signals
common to both inputs are canceled out. When config-
ured for differential inputs, the voltage gain of the
MAX9730 is set by:
where AV is the desired voltage gain in dB. RIN+ should
be equal to RIN- and RFB+ should be equal to RFB-. The
Class G output stage has a fixed gain of 4V/V (12dB). Any
gain or attenuation set by the external input stage resistors
will add to or subtract from this fixed gain. See Figure 3.
A
R
dB
V
FB
IN
=×
()
20
4
log
_
MAX9730
EFFICIENCY vs. CLASS AB
MAX9730
fig02
OUTPUT POWER (W)
EFFICIENCY
(%)
1.5
1.0
0.5
10
20
30
40
50
60
70
80
90
100
0
2.0
MAX9730
TRADITIONAL CLASS AB
MAX9730
+
IN+
FB+
RIN+
RIN-
CIN-
IN-
FB-
-
CLASS G
OUTPUT
STAGE
RFB+
RFB-
Figure 2. MAX9730 Efficiency vs. Class AB Efficiency vs.
Class D Efficiency
Figure 3. Gain Setting
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9730EVKIT+ | 功能描述:音頻 IC 開發工具 MAX9730 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX9730EWP+TG45 | 功能描述:音頻放大器 2.4W Class G Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| MAX9736AETJ/V+ | 功能描述:音頻放大器 Mono/Stereo Class D Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| MAX9736AETJ/V+T | 功能描述:音頻放大器 Mono/Stereo Class D Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| MAX9736AETJ+ | 功能描述:音頻放大器 Mono/Stereo Class D Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
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