- 您现在的位置：买卖IC网 > PDF目录10265 > MAX9750CETI+ (Maxim Integrated Products)IC AMP AUDIO PWR 2.6W AB 28TQFN PDF资料下载
参数资料
| 型号： | MAX9750CETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/30页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.6W AB 28TQFN |
| 标准包装： | 60 |
| 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： | 2.2W x 2 @ 3 欧姆; 110mW x 2 @ 16 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： | 管件 |
第1页第2页第3页第4页第5页当前第6页第7页第8页第9页第10页第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页第29页第30页
MAX9750/MAX9751/MAX9755
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
14
______________________________________________________________________________________
parasitic bond wire and trace inductance. Although not
typically required, additional high-frequency ripple atten-
uation can be achieved by increasing the size of C2 (see
the
Block Diagrams).
Headphone Sense Input (HPS)
The headphone sense input (HPS) monitors the head-
phone jack and automatically configures the device
based upon the voltage applied at HPS. A voltage of
less than 0.8V sets the device to speaker mode. A volt-
age of greater than 2V disables the bridge amplifiers
and enables the headphone amplifiers.
For automatic headphone detection, connect HPS to the
control pin of a 3-wire headphone jack as shown in
Figure 5. With no headphone present, the output imped-
ance of the headphone amplifier pulls HPS low. When a
headphone plug is inserted into the jack, the control pin
is disconnected from the tip contact and HPS is pulled
to VDD through a 10A current source.
BIAS
The MAX9750/MAX9751/MAX9755 feature 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 perfor-
mance of the device.
Gain Selection
MAX9750
The MAX9750 features an internally set, selectable gain.
The GAIN1 and GAIN2 inputs set the maximum gain of
the MAX9750 speaker and headphone amplifiers (Table
1). The gain of the device can vary based upon the volt-
age at VOL (see the
Analog Volume Control (VOL) sec-
tion). However, the maximum gain cannot be exceeded.
MAX9751/MAX9755
The gain of the MAX9751/MAX9755 is set by the GAIN
input. Driving GAIN high sets the gain of the speaker
amplifiers to 9dB and the gain of the headphone ampli-
fiers to 0dB. Driving GAIN low sets the gain of the
speaker amplifiers to 10.5dB, and the gain of the head-
phone amplifiers to 3dB (Table 2).
Analog Volume Control (VOL)
The MAX9750 features an analog volume control that
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 HPVDD (full mute),
with example step sizes shown in Table 3. Connect the
reference of the device driving VOL (Figure 6) to HPVDD.
Since the volume control ADC is ratiometric to HPVDD,
any changes in HPVDD are negated. The gain step sizes
are not constant; the step sizes are 0.5dB/step at the
upper extreme, 2dB/step in the midrange, and 4dB/step
at the lower extreme. Figure 7 shows the transfer function
of the volume control for a 3.3V supply.
ADDITIONAL THD+N DUE
TO DC-BLOCKING CAPACITORS
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.001
0.01
0.1
1
10
0.0001
10
100k
TANTALUM
ALUM/ELEC
Figure 4. Distortion Contributed by DC-Blocking Capacitors
MAX9750/
MAX9751/
MAX9755
10
μA
1k
Ω
1k
Ω
20
14
13
VDD
HPS
HPOUTL
HPOUTR
SHUTDOWN
CONTROL
Figure 5. HPS Configuration
相关PDF资料 |
PDF描述 |
|---|---|
| VE-261-IU-S | CONVERTER MOD DC/DC 12V 200W |
| VE-224-IW-S | CONVERTER MOD DC/DC 48V 100W |
| MAX9760ETI+ | IC AMP AUDIO PWR 3W STER 28TQFN |
| VE-24Z-MY | CONVERTER MOD DC/DC 2V 20W |
| D38999/20JG75AN | CONN HSG RCPT 4POS WALL MT PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9750CETI+ | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9750CETI+C2U | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9750CETI+T | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
| MAX9750CEUI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9751ETI+ | 功能描述:音频放大器 Integrated Circuits (ICs) 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 |
发布紧急采购，3分钟左右您将得到回复。