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參數(shù)資料
| 型號： | MAX9704ETJ+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 16W STER 32TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 16W x 2 @ 16 歐姆 |
| 電源電壓： | 10 V ~ 25 V |
| 特點(diǎn)： | 消除爆音，差分輸入，靜音，短路和熱保護(hù)，關(guān)機(jī) |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 32-TQFN-EP（7x7） |
| 封裝/外殼： | 32-WQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
MAX9703/MAX9704
10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
10
______________________________________________________________________________________
Shutdown
The MAX9703/MAX9704 have a shutdown mode that
reduces power consumption and extends battery life.
Driving
SHDN low places the device in low-power
(0.2A) shutdown mode. Connect
SHDN to a logic high
for normal operation.
Click-and-Pop Suppression
The MAX9703/MAX9704 feature comprehensive click-
and-pop suppression that eliminates audible transients
on startup and shutdown. While in shutdown, the H-
bridge is pulled to PGND through 330k
Ω. During start-
up, or power-up, the input amplifiers are muted and an
internal loop sets the modulator bias voltages to the cor-
rect levels, preventing clicks and pops when the H-
bridge is subsequently enabled. Following startup, a
soft-start function gradually unmutes the input amplifiers.
The value of the soft-start capacitor has an impact on the
click/pop levels. For optimum performance, CSS should
be at least 0.18F with a voltage rating of at least 7V.
Mute Function
The MAX9703/MA9704 features a clickless/popless
mute mode. When the device is muted, the outputs
stop switching, muting the speaker. Mute only affects
the output stage and does not shut down the device.
To mute the MAX9703/MAX9704, drive SS to PGND by
using a MOSFET pulldown (Figure 3). Driving SS to
PGND during the power-up/down or shutdown/turn-on
cycle optimizes click-and-pop suppression.
Applications Information
Filterless Operation
Traditional class D amplifiers require an output filter to
recover the audio signal from the amplifier’s PWM out-
put. The filters add cost, increase the solution size of
the amplifier, and can decrease efficiency. The tradi-
tional PWM scheme uses large differential output
swings (2 VDD peak-to-peak) and causes large ripple
currents. Any parasitic resistance in the filter compo-
nents results in a loss of power, lowering the efficiency.
The MAX9703/MAX9704 do not require an output filter.
The devices rely on the inherent inductance of the
speaker coil and the natural filtering of both the speak-
er and the human ear to recover the audio component
of the square-wave output. Eliminating the output filter
results in a smaller, less-costly, more-efficient solution.
Because the frequency of the MAX9703/MAX9704 out-
put is well beyond the bandwidth of most speakers,
voice coil movement due to the square-wave frequency
is very small. Although this movement is small, a speak-
er not designed to handle the additional power can be
damaged. For optimum results, use a speaker with a
series inductance > 30H. Typical 8
Ω speakers exhibit
series inductances in the range of 30H to 100H.
Optimum efficiency is achieved with speaker induc-
tances > 60H.
Internal Regulator Output (VREG)
The MAX9703/MAX9704 feature an internal, 6V regula-
tor output (VREG). The MAX9703/MAX9704 REG output
pin simplifies system design and reduces system cost
by providing a logic voltage high for the MAX9703/
MAX9704 logic pins (G_, FS_). VREG is not available as a
logic voltage high in shutdown mode. Do not apply VREG
as a 6V potential to surrounding system components.
Bypass REG with a 6.3V, 0.01F capacitor to AGND.
Figure 2. MAX9704 Efficiency vs. Class AB Efficiency
0
30
20
10
40
50
60
70
80
90
100
0
6
8
10 12 14 16 18
24
20
EFFICIENCY vs. OUTPUT POWER
OUTPUT POWER (W)
EFFICIENCY
(%)
VDD = 15V
f = 1kHz
RL = 8
Ω
MAX9704
CLASS AB
MAX9703/
MAX9704
SS
0.18
μF
GPIO
MUTE SIGNAL
Figure 3. MAX9703/MAX9704 Mute Circuit
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| MAX9704EVKIT | 制造商:Maxim Integrated Products 功能描述:15W FILTERLESS SPREAD-SPECTRUM MO - Rail/Tube |
| MAX9705AEBC+T | 功能描述:音頻放大器 2.3W Ultra-Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9705AETB/V+T | 功能描述:音頻放大器 2.3W Ultra-Low-EMI Filterless Class D Audio Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9705AETB+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 2.3W CLS-D 10TDFN EP - Rail/Tube |
| MAX9705AETB+T | 功能描述:音頻放大器 2.3W Ultra-Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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