- 您现在的位置：买卖IC网 > PDF目录10443 > MAX4409ETP+ (Maxim Integrated Products)IC AMP AUDIO .08W STER AB 20TQFN PDF资料下载
参数资料
| 型号： | MAX4409ETP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .08W STER AB 20TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | DirectDrive® |
| 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： | 80mW x 2 @ 16 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： | 20-TQFN-EP（4x4） |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1390 (CN2011-ZH PDF) |
MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
12
______________________________________________________________________________________
driver. The negative supply voltage appears on the
PVSS pin. A typical application is a negative supply to
adjust the contrast of LCD modules.
When considering the use of PVSS in this manner, note
that the charge-pump voltage at PVSS is roughly pro-
portional to -VDD and is not a regulated voltage. The
charge-pump output impedance plot appears in the
Typical Operating Characteristics.
Component Selection
Gain-Setting Resistors
External feedback components set the gain of the
MAX4409. Resistors RF and RIN (see Typical Application
Circuit) set the gain of each amplifier as follows:
Choose feedback resistor values of 10k
Ω. Values other
than 10k
Ω increase VOS due to the input bias current,
which in turn increases the amount of DC current flow
to the load. Resistors RIN, R2, RF, and R1 must be of
equal value for best results. Use high-tolerance resis-
tors for best matching and CMRR. For example, the
worst-case CMRR attributed to a 1% resistor mismatch
is -34dB. This is the worst case, and typical resistors do
not affect CMRR as drastically. The effect of resistor
mismatch is shown in Figure 5. If all resistors match
exactly, then any voltage applied to node A should be
duplicated on OUT so no net differential voltage
appears between node A (normally the HP jack socket
GND) and OUT. For resistors with a tolerance of n%,
the worst mismatch is found when RIN and R1 are at
+n%, and RF and R2 are at -n%. If all four resistors are
nominally the same value, then 2n% of the voltage at A
appears between A and OUT.
Packaged resistor arrays can provide well-matched
components for this type of application. Although their
absolute tolerance is not well controlled, the internal
matching of resistors can be very good. At higher fre-
quencies, the rejection is usually limited by PC board
layout; care should be taken to make sure any stray
capacitance due to PC board traces on node N1 match-
es those on node N2. Ultimately, CMRR performance is
limited by the amplifier itself (see Electrical
Characteristics).
Compensation Capacitor
The stability of the MAX4409 is affected by the value of
the feedback resistor (RF). The combination of RF and
the input and parasitic trace capacitance introduces an
additional pole. Adding a capacitor in parallel with RF
compensates for this pole. Under typical conditions
with proper layout, the device is stable without the
additional capacitor.
Input Filtering
The input capacitor (CIN), in conjunction with RIN, forms a
highpass filter that removes the DC bias from an incom-
ing signal (see Typical Application Circuit). The AC-cou-
pling capacitor allows the amplifier to bias the signal to
an optimum DC level. Assuming zero-source impedance,
the -3dB point of the highpass filter is given by:
f
RC
dB
IN IN
-
2
3
1
=
π
AV =
R
F
IN
MAX4409
R1
N2
N1
R2
RIN
RF
A
OUT
Figure 5. Common-Mode Sense Equivalent Circuit
100
10
1
0.1
0.01
0.001
0
100
150
50
200
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX4409
fig04
OUTPUT POWER (mW)
VDD = 3V
AV = -1V/V
RL = 16
Ω
fIN = 10kHz
THD+N
(%)
OUTPUTS IN
PHASE
ONE
CHANNEL
OUTPUTS
180
° OUT OF
PHASE
Figure 4. Output Power vs. THD+N with Inputs In/Out of Phase
相关PDF资料 |
PDF描述 |
|---|---|
| VI-271-IW-F2 | CONVERTER MOD DC/DC 12V 100W |
| VE-JNN-MY-B1 | CONVERTER MOD DC/DC 18.5V 50W |
| VI-B74-MX-F2 | CONVERTER MOD DC/DC 48V 75W |
| VE-JNM-MY-B1 | CONVERTER MOD DC/DC 10V 50W |
| VI-26X-IW-F1 | CONVERTER MOD DC/DC 5.2V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4409ETP+ | 功能描述:音频放大器 80mW DirectDrive Stereo Headphone Amp 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 |
| MAX4409ETP+T | 功能描述:音频放大器 80mW DirectDrive Stereo Headphone Amp 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 |
| MAX4409ETP-T | 功能描述:音频放大器 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 |
| MAX4409EUD | 制造商:Maxim Integrated Products 功能描述:80MW, DIRECTDRIVE, STEREO HEADPHONE AMPLIFIER - Bulk |
| MAX4409EUD+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP HDPH 2CH STEREO 0.08W CLS-AB 14TSSOP - Rail/Tube |
发布紧急采购，3分钟左右您将得到回复。