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參數(shù)資料
| 型號(hào)： | MAX9742ETX+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 17/36頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 20.5W D 36TQFN |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 20.5W x 2 @ 8 歐姆 |
| 電源電壓： | 20 V ~ 40 V，±10 V ~ 20 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： | 36-TQFN 裸露焊盤（6x6） |
| 封裝/外殼： | 36-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
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MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
24
______________________________________________________________________________________
Multiple-Pole MID Network vs.
Single-Pole VMID Network for Increased PSRR
Performance (Single-Supply Operation)
A multiple-pole MID network improves PSRR perfor-
mance over a single-pole network. Since the input
amplifiers of the MAX9742 are biased at VMID, any
noise coupled into the MID input using the MID bias
network supply appears at the outputs of the MAX9742.
Increasing the number of poles in the MID network pro-
vides further attenuation of low-frequency noise at the
MID input, and therefore, improving the AC PSRR per-
formance of the MAX9742. Figure 11 shows the recom-
mended single-pole and two-pole MID input bias
networks. Figure 12 illustrates the differences of the
MAX9742’s low-frequency AC PSRR performance with
the single-pole and two-pole networks shown in Figure
11.
Soft-Start Capacitor (CSFT)
The soft-start capacitor determines the timing for the
soft-start power-up sequencing that minimizes audible
clicks-and-pops during power-up/power-down transi-
tions and when entering/exiting shutdown mode.
Connect a capacitor between SFT and ground for
proper operation. For optimum performance, this
capacitor should equal 0.22F. Using capacitor values
much smaller than these values degrade click-and-
pop performance and values much greater lengthen
startup time.
Startup Time Considerations
At the beginning of the soft-start sequence, the
MAX9742 ensures VOUT_ is approximately equal to
VMID before continuing the soft-start sequence. For sin-
gle-supply operation with single-ended outputs, the
output-coupling capacitors (COUT) are first gradually
charged up to VMID before continuing soft-start
sequencing. This gradual charging up of COUT mini-
mizes audible transients that may appear across the
R1
10k
R2
10k
VDD
SINGLE-POLE NETWORK
TO
MID
CMID1
22F
CMID2
1F
R1
10k
R2
10k
VDD
TWO-POLE NETWORK
TO
MID
CMID1
10F
CMID2
10F
R3
10k
Figure 11. Recommended MID Input Bias Networks
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9742
fg12
FREQUENCY (Hz)
PSRR
(dB)
10k
1k
100
-100
-80
-60
-40
-20
0
20
-120
10
100k
1-POLE MID NETWORK
SINGLE SUPPLY
VDD = 24V + 500mVP-P
RL = 8
2-POLE MID NETWORK
Figure 12. Comparison of MAX9742 AC PSRR with Single-Pole
and Two-Pole MID Networks
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9742ETX+ | 功能描述:音頻放大器 Stereo 16W 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 |
| MAX9742ETX+T | 功能描述:音頻放大器 Stereo 16W 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 |
| MAX9742EVKIT+ | 功能描述:音頻放大器 Evaluation Kit for the MAX9742 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 |
| MAX9744ETH+ | 功能描述:音頻放大器 Stereo 20W 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 |
| MAX9744ETH+T | 功能描述:音頻放大器 Stereo 20W 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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