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參數(shù)資料
| 型號： | MAX9776EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 26/38頁 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX9776 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | DirectDrive® |
| 放大器類型： | D 類 |
| 輸出類型： | 1-通道（單聲道），帶立體聲耳機 |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 1.5W x 1 @ 4 歐姆; 60mW x 2 @ 16 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： | MAX9776 |
| 已供物品： | 板，CD |
| 相關(guān)產(chǎn)品： | MAX9776EBX+TG45-ND - IC AMP AUDIO PWR 1.5W MONO 36WLP MAX9776ETJ+T-ND - IC AMP AUDIO PWR 1.5W D 32TQFN MAX9776ETJ+-ND - IC AMP AUDIO PWR 1.5W D 32TQFN |
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Single-Ended Input
The MAX9775/MAX9776 can be configured as a single-
ended input amplifier by appropriately configuring the
Input Control Register (see Tables 5a and 5b).
DC-Coupled Input
The input amplifier can accept DC-coupled inputs that
are biased to the amplifier’s bias voltage. DC-coupling
eliminates the input-coupling capacitors; reducing com-
ponent count to potentially six external components
(see the
Typical Application Circuits). However, the
highpass filtering effect of the capacitors is lost, allow-
ing low-frequency signals to feed through to the load.
Unused Inputs
Connect any unused input pin directly to VBIAS. This
saves input capacitors on unused inputs and provides
the highest noise immunity on the input.
Component Selection
Input Filter
An input capacitor (CIN) in conjunction with the input
impedance of the MAX9775/MAX9776 form a highpass
filter that removes the DC bias from the incoming signal.
The AC-coupling capacitor allows the amplifiers to auto-
matically 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 that f-3dB is well below the lowest fre-
quency of interest. Use capacitors whose dielectrics
have low-voltage coefficients, such as tantalum or alu-
minum electrolytic. Capacitors with high-voltage coeffi-
cients, such as ceramics, may result in increased
distortion at low frequencies.
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 cell
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.
Class D Output Filter
The MAX9775/MAX9776 do not require a Class D out-
put filter. The devices pass EN55022B emission stan-
dards with 152mm of unshielded speaker cables.
However, output filtering can be used if a design is fail-
ing radiated emissions due to board layout or cable
length, or the circuit is near EMI-sensitive devices. Use
a ferrite bead filter when radiated frequencies above
10MHz are of concern. Use an LC filter when radiated
frequencies below 10MHz are of concern, or when long
leads (> 152mm) connect the amplifier to the speaker.
Figure 12 shows optional speaker amplifier output filters.
External Component Selection
BIAS Capacitor
VBIAS is the output of the internally generated DC bias
voltage. The VBIAS bypass capacitor, CVBIAS improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the clickless/popless, startup/shutdown
DC bias waveforms for the speaker amplifiers. Bypass
VBIAS with a 1F capacitor to GND.
f
RC
dB
IN IN
=
3
1
2
π
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
32
______________________________________________________________________________________
OUT_+
OUT_-
33
μH
33
μH
0.47
μF
0.033
μF
0.1
μF
22
Ω
22
Ω
0.033
μF
0.1
μF
Figure 12. Speaker Amplifier Output Filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9776EVKIT+ | 功能描述:音頻 IC 開發(fā)工具 MAX9776 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
| MAX9777ETI+ | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX9777ETI+T | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX9778ETI+ | 功能描述:音頻放大器 Integrated Circuits (ICs) 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 |
| MAX9778ETI+T | 功能描述:音頻放大器 Integrated Circuits (ICs) 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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