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參數(shù)資料
| 型號： | MAX9776EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/38頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVALUATION KIT FOR MAX9776 |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 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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MAX9775/MAX9776
if the right and left volume controls are set for a maxi-
mum gain 0dB (11111 in Table 7, IN+6dB = 0 from Table
10) before the 3D effect is activated, the volume control
should be programmed to -6dB (11001 in Table 7)
immediately after the 3D effect has been activated.
Signal Path
The audio inputs of the MAX9775/MAX9776—INA, INB,
and INC—are preamplified and then mixed by the input
mixer to create three internal signals: Left (L), Right (R),
and Mono (M). Tables 5a and 5b show how the inputs
are mixed to create L, R, and M. These signals are then
independently volume adjusted by the L, R, and M vol-
ume control and routed to the output mixer. The output
mixer mixes the internal L, R, and M signals to create a
variety of audio mixes that are output to the headphone
speaker and mono receiver amplifiers. Figure 6 shows
the signal path that the audio signals take.
Signal amplification takes place in three stages. In the
first stage, the inputs (INA, INB, and INC) are pre-
amplified. The amount by which each input is amplified
is determined by the bits INA+20dB (B4 in the Input
Mode Control Register) and IN+6dB (B3 in the Global
Control Register). After preamplification, they are mixed
in the Input Mixer to create the internal signals L, R,
and M.
In the second stage of amplification, the internal L, R,
and M signals are independently volume adjusted.
Finally, each output amplifier has its own internal gain.
The speaker, headphone, and mono receiver amplifiers
have fixed gains of 12dB, 3dB, and 3dB, respectively.
Current-Limit and Thermal Protection
The MAX9775/MAX9776 feature current limiting and
thermal protection to protect the device from short cir-
cuits and overcurrent conditions. The headphone
amplifier pulses in the event of an overcurrent condition
with a pulse every 100s as long as the condition is
present. Should the current still be high, the above
cycle is repeated. The speaker amplifier current-limit
protection clamps the output current without shutting
down the output. This can result in a distorted output.
Current is limited to 1.6A in the speaker amplifiers and
170mA in the headphone and mono receiver amplifiers.
The MAX9775/MAX9776 have thermal protection that
disables the device at +150°C until the temperature
decreases to +120°C.
2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
24
______________________________________________________________________________________
INPUT
MIXER
INPUT
PREAMPLIFIER
INPUT A:
0dB, 6dB, 20dB
-75dB TO 0dB
0dB TO 6dB
MVOL
MONO+6dB
LVOL
-75dB TO 0dB
RVOL
INPUT B AND C:
0dB, 6dB
OUTPUT
MIXER
3dB
12dB
SPEAKER
HEADPHONE
RECEIVER
MONO
Figure 7. Signal Path
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相關代理商/技術參數(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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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