LM2904ST
Dual general-purpose low-power operational amplifiers in compact MSOP packages
Manufacturer： ['stm', 'rohm']
series introduction
# LM2904ST Product Series Introduction
## 1. Overview
The LM2904ST is a highly popular and widely used operational amplifier (op - amp) product series. Operational amplifiers are fundamental building blocks in analog electronics, and the LM2904ST offers a range of features and performance characteristics that make it suitable for a diverse set of applications.
## 2. Key Features
### 2.1 Dual Operational Amplifiers
The LM2904ST contains two independent operational amplifiers in a single package. This dual - op - amp configuration provides designers with the flexibility to implement multiple signal - processing functions within a compact space. For example, in a circuit that requires both amplification and filtering of different signals, the two op - amps can be used independently to perform these tasks.
### 2.2 Wide Power Supply Range
It can operate over a wide range of power supply voltages. The supply voltage can typically range from ±2V to ±18V. This wide range allows the LM2904ST to be used in various power - supply environments, whether it is a battery - powered device with a low - voltage supply or a more traditional power - line - powered system with a higher voltage.
### 2.3 Low Input Bias Current
The input bias current of the LM2904ST is relatively low. Low input bias current is crucial in applications where the source impedance is high. For instance, in sensor - interface circuits, where the sensor may have a high output impedance, a low input bias current ensures that the op - amp does not load the sensor significantly, thus preserving the accuracy of the sensor signal.
### 2.4 High Open - Loop Gain
The op - amp in the LM2904ST has a high open - loop gain. Open - loop gain is the gain of the op - amp without any external feedback. A high open - loop gain allows for precise amplification of small input signals. In applications such as audio pre - amplifiers, where weak audio signals need to be amplified to a usable level, the high open - loop gain of the LM2904ST enables accurate signal amplification.
### 2.5 Unity - Gain Stable
The LM2904ST is unity - gain stable. This means that it can be used in configurations where the closed - loop gain is set to 1 (a voltage follower). Voltage followers are commonly used to isolate different parts of a circuit, buffer signals, and match impedances. The unity - gain stability of the LM2904ST ensures reliable operation in such applications.
## 3. Electrical Specifications
### 3.1 Input Offset Voltage
The input offset voltage is typically in the range of a few millivolts. Input offset voltage is the voltage that must be applied between the two input terminals of the op - amp to make the output voltage zero. A low input offset voltage is desirable in applications where accurate signal processing is required, such as in precision measurement circuits.
### 3.2 Bandwidth
The LM2904ST has a certain bandwidth, which determines the range of frequencies over which the op - amp can operate effectively. The bandwidth is sufficient for many general - purpose analog applications, including audio frequency ranges. For example, in audio amplifiers, the bandwidth of the LM2904ST allows it to amplify audio signals without significant distortion over the audible frequency range (20Hz - 20kHz).
### 3.3 Slew Rate
The slew rate indicates how fast the output voltage of the op - amp can change. A relatively high slew rate in the LM2904ST enables it to handle fast - changing input signals. In applications such as pulse - shaping circuits or high - frequency signal processing, a sufficient slew rate is necessary to ensure that the output can accurately
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8-MSOP
8-TSSOP 8-MSOP
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