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參數(shù)資料
| 型號： | MAX9751ETI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers |
| 中文描述： | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC28 |
| 封裝： | 5 X 5 MM, 0.80 MM HEIGHT, TQFN-28 |
| 文件頁數(shù)： | 14/31頁 |
| 文件大?。?/td> | 673K |
| 代理商： | MAX9751ETI |
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M
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
14
______________________________________________________________________________________
BEEP Input
The MAX9750 features an audible alert beep input
(BEEP) that accepts a mono system alert signal and
mixes it into the stereo audio path. When the amplitude
of V
BEEP(OUT)
exceeds 800mV
P-P
(Figure 8) and the
frequency of the beep signal is greater than 300Hz, the
beep signal is mixed into the active audio path (speaker
or headphone). If the signal at V
BEEP(OUT)
is either
<800mV
P-P
or <300Hz, the BEEP signal is not mixed into
the audio path. The amplitude of the BEEP signal at the
device output is roughly the amplitude of V
BEEP(OUT)
times the gain of the selected signal path.
The input resistor (R
B
) sets the gain of the BEEP input
amplifier, and thus the amplitude of V
BEEP(OUT)
. Choose
R
B
based on:
where R
INT
is the value of the BEEP amplifier feedback
resistor (47k
) and V
IN
is the BEEP input amplitude.
Note that the BEEP amplifier can be set up as either an
attenuator, if the original alert signal amplitude is too
large, or set to gain up the alert signal if it is below
800mV
P-P
. AC couple the alert signal to BEEP. Choose
the value of the coupling capacitor as described in the
Input Filtering
section. Multiple beep inputs can be
summed (Figure 8).
Input Multiplexer
The MAX9751 features a 2:1 input multiplexer on each
amplifier, allowing input selection between two stereo
sources. The logic input IN1/
2
controls both multiplex-
ers. A logic high selects input IN_1 and a logic low
selects input IN_2.
Shutdown
The MAX9750/MAX9751/MAX9755 features a 0.2μA,
low-power shutdown mode that reduces quiescent cur-
rent consumption and extends battery life. Driving
SHDN
low disables the drive amplifiers, bias circuitry,
and charge pump, and drives BIAS and all outputs to
GND. Connect
SHDN
to V
DD
for normal operation.
Click-and-Pop Suppression
Speaker Amplifier
The MAX9750/MAX9751/MAX9755 speaker amplifiers
feature Maxim’s comprehensive, industry-leading click-
and-pop suppression. During startup, the click-pop
suppression circuitry eliminates any audible transient
sources internal to the device. When entering shut-
down, both amplifier outputs ramp to GND quickly and
simultaneously.
R
V
R
B
IN
INT
×
0 8
.
≤
MAX9750
V
REF
DAC
HPV
DD
VOL
Figure 6. Volume Control Circuit
GAIN
SPEAKER MODE
GAIN (dB)
HEADPHONE
MODE GAIN (dB)
0
1
10.5
9
3
0
Table 2. MAX9751 Gain Settings
SPEAKER MODE GAIN (dB)
MAX9750A
MAX9750B
9
12
10.5
13.5
GAIN1
GAIN2
MAX9750C
6
9
7.5
10.5
HEADPHONE MODE GAIN (dB)
0
0
1
1
0
1
0
1
15
18
16.5
19.5
0
0
3
3
Table 1. MAX9750 Maximum Gain Settings
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX9751EUI | 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers |
| MAX9755ETI | 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers |
| MAX9755EUI | 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers |
| MAX9750BEUI | 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers |
| MAX9750CETI | 2.6W Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9751ETI+ | 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 |
| MAX9751ETI+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 |
| MAX9751EUI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9752AETI+ | 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 |
| MAX9752AETI+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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