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| 型号： | MAX9720AEBE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/21页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .05W STER AB 16UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive®, SmartSense™ |
| 类型： | AB 类 |
| 输出类型： | 耳机，2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 50mW x 2 @ 32 欧姆 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 特点： | 消除爆音，短路保护和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 16-UCSP（2x2） |
| 封装/外壳： | 16-WFBGA，CSPBGA |
| 包装： | 带卷 (TR) |
MAX9720
Detailed Description
The MAX9720 fixed-gain, stereo headphone amplifier
includes Maxim’s DirectDrive architecture and
SmartSense. DirectDrive eliminates the large output-
coupling capacitors required by conventional single-
supply headphone amplifiers. SmartSense automatically
detects the presence of a short at either output. Under a
fault condition, the shorted output is automatically
disabled and the stereo input signal is automatically
mixed and routed to the remaining active channel. This
prevents damage to the amplifier and optimizes power
savings by eliminating battery drain into a shorted load.
The device consists of two 50mW Class AB headphone
amplifiers, an internal feedback network (MAX9720A:
fixed -1V/V gain, MAX9720B: fixed -1.41V/V gain), a
mono mixer/attenuator, undervoltage lockout (UVLO)/
shutdown control, SmartSense, a charge pump, and
comprehensive click-and-pop suppression circuitry
(see Functional Diagram). The charge pump inverts the
positive supply (VDD), creating a negative supply
(PVSS). The headphone amplifiers operate from these
bipolar supplies with their outputs biased about GND
(Figure 1). The amplifiers have almost twice the supply
range compared to other single-supply amplifiers,
nearly quadrupling the available output power. The
benefit of the GND bias is that the amplifier outputs do
not have a DC component (typically VDD/2). This elimi-
nates the large DC-blocking capacitors required with
conventional headphone amplifiers, conserving board
space, system cost, and improving frequency
response.
The noninvasive SmartSense feature of the MAX9720
detects a short on either output. The SmartSense routine
executes when the device is powered up or brought out
of shutdown (see the SmartSense section). If a fault is
detected, the shorted channel is shut down, the output
goes high impedance, and the stereo audio input is
mixed/attenuated and fed to the remaining active chan-
nel. The device also features an ALERT output that indi-
cates to a host C that SmartSense has detected a
short-circuit condition on either amplifier output.
Forced stereo and forced mono modes can also be
selected through the two MODE_ inputs. In forced
operation mode, SmartSense is disabled and the
device operates as specified by the MODE_ inputs,
regardless of output load conditions. A fast low-power
shutdown mode is also selected through the MODE_
inputs (see the Mode_ Selection section).
The UVLO prevents operation from an insufficient
power supply and click-and-pop suppression, which
eliminates audible transients on startup and shutdown.
Additionally, the MAX9720 features thermal overload
protection and can withstand
±4kV ESD strikes on the
output.
50mW, DirectDrive, Stereo Headphone
Amplifier with SmartSense and Shutdown
10
______________________________________________________________________________________
Pin Description
PIN
BUMP
TSSOP
UCSP
NAME
FUNCTION
1D2
VDD
Positive Power Supply
2
C2
MODE1
Mode Select 1 Logic Input
3
D1
C1P
Flying Capacitor Positive Terminal
4
C1
PGND
Power Ground. Connect to SGND.
5
B1
C1N
Flying Capacitor Negative Terminal
6A1
PVSS
Charge-Pump Output
7
B2
MODE2
Mode Select 2 Logic Input
8A2
ALERT
Open-Drain Interrupt Logic Output
9
A3
INL
Left-Channel Audio Input
10
B3
TIME
Debouncing Timer Capacitor
11
A4
INR
Right-Channel Audio Input
12
B4
SGND
Signal Ground. Connect to PGND.
13
C4
SVSS
Amplifier Negative Power Supply. Connect to PVSS.
14
D4
OUTR
Right-Channel Output
15
C3
HPS
Headphone Sense Input
16
D3
OUTL
Left-Channel Output
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9720AEUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9720AEUE+ | 功能描述:音频放大器 50mW DirectDrive Headphone Amplifier 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 |
| MAX9720AEUE+T | 功能描述:音频放大器 50mW DirectDrive Headphone Amplifier 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 |
| MAX9720BEBE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9720BEBE+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.05W CLS-AB 16UCSP - Rail/Tube |
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