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| 型号： | MAX9945AUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/14页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP MOS-INPUT LP/LN 8-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2.2 V/µs |
| 增益带宽积： | 3MHz |
| 电流 - 输入偏压： | 0.05pA |
| 电压 - 输入偏移： | 600µV |
| 电流 - 电源： | 400µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 4.75 V ~ 38 V，±2.4 V ~ 19 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
MAX9945
For voltage-output sensors, a noninverting amplifier is
typically used to buffer and/or apply a small gain to, the
input voltage signal. Due to the extremely high imped-
ance of the sensor output, a low input bias current with
a small temperature variation is very important for these
applications.
Power-Supply Decoupling
The MAX9945 operates from a +4.75V to +38V, VEE ref-
erenced power supply. Bypass the power-supply
inputs VCC and VEE to a quiet copper ground plane,
with a 0.1F ceramic capacitor in parallel with a 4.7F
electrolytic capacitor, placed close to the leads.
Layout Techniques
A good layout is critical to obtaining high performance
especially when interfacing with high-impedance sen-
sors. Use shielding techniques to guard against para-
sitic leakage paths. For transimpedance applications,
for example, surround the inverting input, and the
traces connecting to it, with a buffered version of its
own voltage. A convenient source of this voltage is the
noninverting input pin. Pins 1, 5, and 8 on the MAX
package are unconnected, and can be connected to
an analog common potential, or to the driven guard
potential, to reduce leakage on the inverting input.
A good layout guard rail isolates sensitive nodes, such
as the inverting input of the MAX9945 and the traces
connecting to it (see Figure 1), from varying or large volt-
age differentials that otherwise occur in the rest of the
circuit board. This reduces leakage and noise effects,
allowing sensitive measurements to be made accurately.
Take care to also decrease the amount of stray capaci-
tance at the op amp’s inputs to improve stability. To
achieve this, minimize trace lengths and resistor leads
by placing external components as close as possible to
the package. If the sensor is inherently capacitive, or is
connected to the amplifier through a long cable, use a
low-value feedback capacitor to control high-frequency
gain and peaking to stabilize the feedback loop.
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
8
_______________________________________________________________________________________
1
2
8
7
μMAX
3
4
6
5
MAX9945
IN-
IN+
MAX9945
VOUT
+
-
+
Figure 1. Shielding the Inverting Input to Reduce Leakage
MAX9945
IN+
IN-
10k
Ω
10k
Ω
Figure 2. Input Differential Voltage Protection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9945EVKIT+ | 功能描述:放大器 IC 开发工具 38V MOS-Input Op Amp RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX9947ETE+ | 功能描述:射频收发器 AISG Interface RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MAX9947ETE+T | 功能描述:射频收发器 AISG Interface RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MAX9947EVKIT+ | 功能描述:射频开发工具 MAX9947EVKIT+ RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX9949DCCB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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