- 您现在的位置：买卖IC网 > PDF目录10340 > MAX9789BETJ+T (Maxim Integrated Products)IC AMP AUDIO 2W STER AB 32TQFN PDF资料下载
参数资料
| 型号： | MAX9789BETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 2W STER AB 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive® |
| 类型： | AB 类 |
| 输出类型： | 2-通道（立体声）带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 2W x 2 @ 4 欧姆; 100mW x 2 @ 16 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 消除爆音，静音，短路保护和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页当前第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
MAX9789/MAX9790
Windows Vista-Compliant, Stereo Class AB Speaker
Amplifiers and DirectDrive Headphone Amplifiers
______________________________________________________________________________________
19
Headphone Amplifier Power-Supply
Input (HPVDD and PVSS)
The headphone amplifiers are powered from HPVDD
and PVSS. HPVDD is the positive supply of the head-
phone amplifiers and ranges from 3.0V to 5.5V. Bypass
HPVDD with a 10F capacitor to PGND. PVSS is the
negative supply of the headphone amplifiers. Bypass
PVSS with a 1F capacitor to PGND. Connect PVSS to
CPVSS. The charge pump is powered by CPVDD.
CPVDD ranges from 3.0V to 5.5V and should be the
same potential as HPVDD. Bypass CPVDD with a 1F
capacitor to PGND. The charge pump inverts the volt-
age at CPVDD, and the resulting voltage appears at
CPVSS. A 1F capacitor must be connected between
C1N and C1P.
Power Supply and LDO Input (VDD)
The internal LDO and the remainder of the device is
powered by VDD. VDD ranges from 4.5V to 5.5V.
Bypass VDD with a 0.1F capacitor to GND and two
1F capacitors in parallel to GND. Note additional bulk
capacitance is required at the device if long input
traces between VDD and the power source are used.
Input Filtering
The input capacitor (CIN), in conjunction with the ampli-
fier input resistance (RIN), forms a highpass filter that
removes the DC bias from the incoming signal. The AC-
coupling capacitor allows the amplifier to bias the sig-
nal to an optimum DC level. Assuming zero source
impedance, the -3dB point of the highpass filter is
given by:
RIN is the amplifier’s internal input resistance value
given in the
Electrical Characteristics. Choose CIN such
that f-3dB is well below the lowest frequency of interest.
Setting f-3dB too high affects the amplifier’s low fre-
quency response. Use capacitors with adequately low
voltage coefficient dielectrics, such as 1206-sized X7R
ceramic capacitors. Capacitors with higher voltage
coefficients result in increased distortion at low fre-
quencies (see Figure 7).
BIAS Capacitor
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, CBIAS improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the clickless/popless, startup/shutdown
DC bias waveforms for the speaker and headphone
amplifiers. Bypass BIAS with a 1F capacitor to GND.
Charge-Pump Capacitor Selection
Use capacitors with an ESR less than 100mΩ for opti-
mum performance. Low ESR ceramic capacitors mini-
mize the output resistance of the charge pump. For
best performance over the extended temperature
range, select capacitors with an X7R dielectric.
Flying Capacitor (C1)
The value of the flying capacitor (C1) affects the load
regulation and output resistance of the charge pump. A
C1 value that is too small degrades the device’s ability
to provide sufficient current drive, which leads to a loss
of output voltage. Connect a 1F capacitor between
C1P and C1N.
f
RC
dB
IN IN
=
3
1
2
π
INPUT COUPLING CAPACITOR-INDUCED THD+N
vs. FREQUENCY (HEADPHONE MODE)
FREQUENCY (Hz)
THD+N
(dB
FS)
100
-85
-80
-75
-70
-65
-60
-55
-50
-90
10
1000
0402 6.3V X5R 10% 1
μF
0603 10V X5R 10% 1
μF
0805 25V X7R 10% 1
μF
1206 25 X7R 10% 1
μF
VOUT = -3dB FS
FS = 1VRMS
RL = 32
Ω
Figure 7. Input Coupling Capacitor-Induced THD+N vs.
Frequency (Headphone Mode)
相关PDF资料 |
PDF描述 |
|---|---|
| MS27508E10F13PB | CONN RCPT 13POS BOX MNT W/PINS |
| TA3MX | CONN PLUG CORD 3POS MALE MINI |
| MS27467E15B19PA | CONN PLUG 19POS STRAIGHT W/PINS |
| AAA7MBZ | CONN PLUG MALE 7PIN SILVER BLK |
| MAX9792CETI+T | IC AMP AUDIO 2.0W STER D 28TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9789CETJ+ | 功能描述:音频放大器 Windows Vista Class AB Speaker 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 |
| MAX9789CETJ+T | 功能描述:音频放大器 Windows Vista Class AB Speaker 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 |
| MAX978EEE | 功能描述:校验器 IC Quad High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX978EEE+ | 功能描述:校验器 IC Quad High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX978EEE+T | 功能描述:校验器 IC Quad High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。