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| 型号： | MAX9787ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/15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
_______________________________________________________________________________________
7
Detailed Description
The MAX9787 combines a 2.2W bridge-tied load speak-
er amplifier and an analog volume control, BEEP input,
and four-level gain control. The MAX9787 features high
90dB, low 0.01% THD+N, industry-leading click-pop
performance, and a low-power shutdown mode.
Each signal path consists of an input amplifier that sets
the gain of the signal path, and feeds the speaker
amplifier (Figure 1). The speaker amplifier uses a BTL
architecture, doubling the voltage drive to the speakers
and eliminating the need for DC-blocking capacitors.
The output consists of two signals, identical in magni-
tude, but 180o out of phase.
An analog volume control varies the gain of the ampli-
fiers based on the DC voltage applied at VOL. An under-
voltage lockout prevents operation from an insufficient
power supply. Click-and-pop suppression eliminates
audible transients on startup and shutdown. The ampli-
fiers include thermal-overload and short-circuit protec-
tion. An additional feature of the speaker amplifiers is
that there is no phase inversion from input to output.
Charge Pump
The MAX9787 features a low-noise charge pump. The
550kHz switching frequency is well beyond the audio
range, and does not interfere with the audio signals.
The switch drivers feature a controlled switching speed
that minimizes noise generated by turn-on and turn-off
transients. Limiting the switching speed of the charge
pump minimizes the di/dt noise caused by the parasitic
bond wire and trace inductance. Although not typically
required, additional high-frequency ripple attenuation
can be achieved by increasing the size of C2 (see the
Typical Operating Circuit).
BIAS
The MAX9787 features an internally generated, power-
supply independent, common-mode bias voltage of 1.8V
referenced to GND. BIAS provides both click-and-pop
suppression and sets the DC bias level for the amplifiers.
Choose the value of the bypass capacitor as described
in the BIAS Capacitor section. No external load should
be applied to BIAS. Any load lowers the BIAS voltage,
affecting the overall performance of the device.
Gain Selection
The GAIN1 and GAIN2 inputs set the maximum gain of
the speaker and amplifiers (Table 1). The gain of the
device can vary based upon the voltage at VOL (see
the Analog Volume Control (VOL) section). However,
the maximum gain cannot be exceeded.
Analog Volume Control (VOL)
An analog volume control varies the gain of the device
in 31 discrete steps based upon the DC voltage
applied to VOL. The input range of VVOL is from 0 (full
volume) to 0.858 x PVDD (full mute), with example step
sizes shown in Table 2. Connect the reference of the
device driving VOL (Figure 2) to PVDD. Since the vol-
ume control ADC is ratiometric to PVDD, any changes in
OUT_+
OUT_
VOLUME
CONTROL
BIAS
IN_
VOL
BIAS
Figure 1. MAX9787 Signal Path
GAIN2
GAIN1
SPEAKER MODE
GAIN (dB)
0
06
0
1
7.5
1
09
1
10.5
Table 1. Gain Settings
MAX9787
VREF
DAC
PVDD
VOL
Figure 2. Volume Control Circuit
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相关代理商/技术参数 |
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| 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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