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参数资料
| 型号： | MAX9787ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/15页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.2W AB 28TQFN |
| 标准包装： | 2,500 |
| 类型： | AB 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 2.2W x 2 @ 3 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 消除爆音，短路保护和热保护，关机，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX9787
2.2W Stereo Audio Power Amplifier
with Analog Volume Control
_______________________________________________________________________________________
9
PVDD are negated. The gain step sizes are not con-
stant; the step sizes are 0.5dB/step at the upper
extreme, 2dB/step in the midrange, and 4dB/step at the
lower extreme. Figure 3 shows the transfer function of
the volume control for a 5V supply.
BEEP Input
An audible alert beep input (BEEP) accepts a mono
system alert signal and mixes it into the stereo audio
path. When the amplitude of VBEEP(OUT) exceeds
800mVP-P (Figure 4) and the frequency of the beep sig-
nal is greater than 400Hz, the beep signal is mixed into
the active audio path (speaker or headphone). If the
signal at VBEEP(OUT) is either < 800mVP-P or <400Hz,
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 VBEEP(OUT) times the gain of
the selected signal path.
The input resistor (RB) sets the gain of the BEEP input
amplifier, and thus the amplitude of VBEEP(OUT).
Choose RB based on:
where RINT is the value of the BEEP amplifier feedback
resistor (47k) and VIN 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
800mVP-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 4).
Shutdown
The MAX9787 features a 0.2A, low-power shutdown
mode that reduces quiescent current 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
VDD for normal operation.
Click-and-Pop Suppression
The MAX9787 speaker amplifiers feature Maxim’s com-
prehensive, industry-leading click-and-pop suppres-
sion. During startup, the click-and-pop suppression
circuitry eliminates any audible transient sources inter-
nal to the device. When entering shutdown, both ampli-
fier outputs ramp to GND quickly and simultaneously.
R
Vx R
B
IN
INT
.
≤
03
Figure 3. Volume Control Transfer Function
-80
-60
-70
-40
-50
-20
-30
-10
10
0
20
02
3
14
5
VOLUME CONTROL
TRANSFER FUNCTION
VVOL (V)
GAIN
(dB)
GAIN1 = GAIN2 = 0
MAX9787
AUDIO
TAPER POT
MAX9787
RS3
47k
BEEP
0.47F
SOURCE 3
RS2
47k
0.47F
SOURCE 2
RS1
47k
0.47F
SOURCE 1
RINT
47k
BIAS
WINDOW
DETECTOR
(0.3VP-P THRESHOLD)
FREQUENCY
DETECTOR
(300Hz THRESHOLD)
SPEAKER AMPLIFIER
INPUTS
VOUT(BEEP)
Figure 4. Beep Input
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9788EBP+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9788EBP+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 2.4W CLS-G 20UCSP - Tape and Reel |
| MAX9788ETI+ | 功能描述:音频放大器 14VP-P Class G Cer Speaker Driver RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9788ETI+ | 制造商:Maxim Integrated Products 功能描述:IC AUDIO PWR AMP CLASS G 2.4W TQFN-28 |
| MAX9788ETI+T | 功能描述:音频放大器 14VP-P Class G Cer Speaker Driver RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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