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參數(shù)資料
| 型號： | MAX9776EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 25/38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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The Global Control Register is used for global configu-
rations, those affecting all inputs and outputs. The bits
in the control register are shown in Table 11.
MAX9775/MAX9776
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
______________________________________________________________________________________
31
Global Control Register
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
Global Control Register
1
0
1
SHDN
IN+6dB
MUTE
SSM
3D/MONO
Table 10. Global Control Register
BIT
NAME
FUNCTION
B4
SHDN
1 = Normal operation
0 = Low-power shutdown mode. I
2C settings are saved.
B3
IN+6dB
1 = All input signals are boosted by 6dB.
0 = All input signals are passed un-amplified.
This bit does not affect INA if the INA+20dB bit (B4 of the Input Mode Control Register) is set to
1, in which case INA is boosted by 20dB.
B2
MUTE
1 = Mute all outputs.
0 = All outputs are active.
B1
SSM
1 = Spread-spectrum Class D modulation.
0 = Fixed-frequency Class D modulation.
B0
3D/MONO
MAX9775:
1 = 3D Enhancement is on.
0 = 3D Enhancement is off.
1 = Speakers will output L+R in modes 7, 8, 12, and 13 (see Table 9).
0 = Speakers will output L in modes 7, 8, 12, and 13 (see Table 9).
Table 11. Global Control Register Configurations
Applications Information
Class D 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 x VDD(P-P)) and causes large ripple currents.
Any parasitic resistance in the filter components results
in a loss of power, lowering the efficiency.
The MAX9775/MAX9776 do not require an output filter.
The device relies 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 switching frequency of the MAX9775/
MAX9776 speaker output is well beyond the bandwidth
of most speakers, voice coil movement due to the
square-wave frequency is very small. Although this move-
ment is small, a speaker not designed to handle the addi-
tional power may be damaged. For optimum results use a
speaker with a series inductance > 10H. Typical 8
Ω
speakers, for portable audio applications, exhibit series
inductances in the 20H to 100H range.
Input Amplifier
Differential Input
The MAX9775/MAX9776 feature a programmable differ-
ential input structure, making it compatible with many
CODECs, and offering improved noise immunity over a
single-ended input amplifier. In devices such as cell
phones, high-frequency signals from the RF transmitter
can be picked up by the amplifier’s input traces. The
signals appear at the amplifier’s inputs as common-
mode noise. A differential input amplifier amplifies the
difference of the two inputs and any signal common to
both is cancelled.
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參數(shù)描述 |
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| 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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