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| 型号： | MAX9637AXA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R 1.5MHZ SC70-8 |
| 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： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.9 V/µs |
| 增益带宽积： | 1.5MHz |
| 电压 - 输入偏移： | 10µV |
| 电流 - 电源： | 36mA |
| 电流 - 输出 / 通道： | 55mA |
| 电压 - 电源，单路/双路(±)： | 2.1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-70-8 |
| 供应商设备封装： | SC-70-8 |
| 包装： | 带卷 (TR) |
3V/5V Low-Power, Low-Noise, CMOS,
Rail-to-Rail I/O Op Amps
MAX9636/MAX9637/MAX9638
10
Driving Capacitive Loads
The ICs have a high tolerance for capacitive loads.
In unity-gain configuration, the op amps can typically
drive up to 300pF pure capacitive load. Increasing the
gain enhances the amplifier’s ability to drive greater
capacitive loads. In unity-gain configurations, capacitive
load drive can be improved by inserting a small (5I to
30I) isolation resistor, RISO, in series with the output,
as shown in Figure 1. This significantly reduces ringing
while maintaining DC performance for purely capaci-
tive loads. However, if the load also has a resistive
component then a voltage-divider is created, introduc-
ing a direct current (DC) error at the output. The error
introduced is proportional to the ratio RISO/RL, which
is usually negligible in most cases. Applications that
cannot tolerate this slight DC error can use an alterna-
tive approach of providing stability by placing a suitable
resistance in parallel with the capacitive load as shown
in Figure 2 (see the Typical Operating Characteristics
section for graphs of the stable operating region for
various capacitive loads vs. resistive loads). While this
approach of adding a resistor parallel to the load does
not introduce DC error, it nevertheless reduces the out-
put swing proportionally.
High-Impedance
Sensor Front-Ends
The ICs interface to both current-output sensors, such
as photodiodes (Figure 3), and high-impedance voltage
sources, such as piezoelectric sensors. For current-
output sensors, a transimpedance amplifier is the most
noise-efficient method for converting the input signal to
a voltage. High-value feedback resistors are commonly
chosen to create large gains, while feedback capacitors
help stabilize the amplifier by cancelling any poles intro-
duced in the feedback function by the highly capacitive
sensor or cabling. A combination of low-current noise
and low-voltage noise is important for these applications.
Take care to calibrate out photodiode dark current if DC
accuracy is important. The high bandwidth and slew
rate also allows AC signal processing in certain medical
photodiode sensor applications such as pulse oximetry.
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
minimal temperature variation is very important for these
applications.
Figure 3. The MAX9636 in a Sensor Preamp Configuration
Figure 1. Using a Series Resistor to Isolate the Capacitive
Load from the Op Amp
Figure 2. Using a Parallel Resistor to Degenerate the Effect of
the Capacitive Load and Increase Stability
SIGNAL
CONDITIONING/
FILTERS
PHOTODIODE
IN-
IN+
VDD
OUT
REF
ADC
MAX1286
MAX9636
-
+
RL
RL + RISO
AV =
RISO
≈ 1V/V
CL
MAX9636/
MAX9637/
MAX9638
-
+
RP
RL
CL
MAX9636/
MAX9637/
MAX9638
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相关代理商/技术参数 |
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| MAX9638AVB+ | 制造商:Maxim Integrated Products 功能描述:OPERATIONAL AMPLIFIER - Rail/Tube |
| MAX9638AVB+T | 功能描述:运算放大器 - 运放 3V-5V Low-Power Op Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX9638EVKIT# | 功能描述:放大器 IC 开发工具 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 |
| MAX9638EVKIT+ | 功能描述:放大器 IC 开发工具 MAX9638 Eval Kit 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 |
| MAX9639EVKIT+ | 功能描述:磁场传感器模块 RoHS:否 制造商:Olimex Ltd. 产品类型:3-Axis Magnetometer Module 接口类型:UEXT Connector 电源电流: 最大工作温度: 尺寸:29 mm x 18 mm |
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