LM2904DT IC

Technical Specifications of LM2904DT

Datasheet	LM2904DT datasheet
Category	Integrated Circuits (ICs)
Family	Linear – Amplifiers – Instrumentation, OP Amps, Buffer Amps
Manufacturer	Rohm Semiconductor
Series	Signature
Packaging	Tape & Reel (TR)
Part Status	Active
Amplifier Type	General Purpose
Number of Circuits	2
Output Type	–
Slew Rate	0.6 V/μs
Gain Bandwidth Product	1.1MHz
-3db Bandwidth	–
Current – Input Bias	20nA
Voltage – Input Offset	2mV
Current – Supply	700μA
Current – Output / Channel	20mA
Voltage – Supply, Single/Dual (±)	3 V ~ 32 V, ±1.5 V ~ 16 V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	8-SO

LM2904DT Introduction

In the area of electronic circuits, where accuracy and variety are king, the LM2904DT operational amplifier is a real workhorse. This amplifier is now standard for both professional and amateur audio workers because it is of high quality and can be used in many different ways.

The LM2904DT is reliable and can be used for a wide range of signal filtering and amplification tasks. This piece goes into detail about the LM2904DT, looking at its most important features, how it can be used in real life, and where it fits in the fast-paced field of electrical design. Join us as we find out what this amplifier can do and push the limits of how circuits can be made.

 LM2904DT Description

This circuit uses two different op amps, each of which has its own built-in frequency adjustment. They were made to be used in the systems that run cars and factories. The system can get power from a single source with a wide range of voltages. No matter what the source voltage is, the poor power drain stays the same. Traditional op-amp circuits like transducer amplifiers, DC gain blocks, and others can now be made more easily with only a single power source.

For example, the common 5 V used in logic systems can be used directly to power these circuits and easily provide the appropriate electronic interfaces. Since both the input and the output use a common-mode voltage source, the output voltage can drop to ground in linear mode.

 LM2904DT Features

• An in-house solution for frequency adjustment.
• Huge boost in DC voltage (100 dB).
• Amplifier with minimal supply current requirements; operates with a wide range of input voltages.
• The negative rail is part of the input common-mode voltage range.
• The power supply voltage is also the range for the differential input voltage.

Applications

• Audio Amplification
• Signal Conditioning
• Sensor Interfaces
• Voltage and current measurement
• Voltage Comparators

Absolute Maximum Ratings

1. Supply Voltage (VCC): 18V
2. Differential Input Voltage (VID): 30V
3. Input Voltage (VI): 15V
4. Output Short-Circuit Duration (TO): Indefinite
5. Power Dissipation (PD): 625 mW
6. Operating Temperature Range (TOPR): -40°C to +125°C
7. Storage Temperature Range (TSTG): -65°C to +150°C

Operating conditions (typical)

1. Supply Voltage (VCC): +5V to +30V
2. Common-Mode Input Voltage Range (VICR): 0V to VCC-1.5V
3. Operating Temperature Range (TOPR): 0°C to +70°C

Electrical characteristics

The electrical qualities of the LM2904DT operational amplifier are standard, which makes it good for a wide range of uses. With a maximum input shift voltage of 7 mV, it can keep the input and output in perfect sync. With a maximum of 250 nA, the input bias current is quite small, which ensures that the input current needs will be low. Low input offset currents of up to 200 nA make sure that the input currents are balanced. The large-signal voltage gain is usually around 100 V/mV to show how well it can boost signals.

A CMRR of 90 dB or more shows that you can filter out common-mode noise. A PSRR of 85 dB shows that VCC-3 volts.it can work reliably even if the power source goes up and down. The input common-mode voltage range is written as VEE+1.5V to VCC-1.5V to make sure it works with a wide range of input voltages. When both VCC+ and VCC-15 voltse set to 15V, the output voltage usually cVCC-1.5 voltsrom VCC-1.5V to VCC-3V. A source current of about 1.5 mA shows that the device doesn’t use much power. The LM2904DT is a versatile and reliable operational amplifier because it has many useful features and specs, such as its electrical characteristics.

Typical single-supply applications

● Signal Conditioning

The LM2904DT can be used in systems with a single power supply to change analogue data from sensors or other signal sources by amplifying, filtering, or changing them in some other way. It’s a great option because it can handle a wide range of input voltages and has gain and filtering built right in.

● Audio Amplification

The LM2904DT is a flexible audio component that can work as a preamplifier or line driver in systems with a single power source. It can make low-level sound signals from microphones or other sources loud enough for speakers or other audio outputs to play back.

● Active Filters

With a single power source, the LM2904DT can be used to build active filters like low-pass, high-pass, band-pass, and notch filters. You can lower or boost sounds at certain frequencies with these filters.

●  Voltage and current measurement

The LM2904DT is a buffer/amplifier that can be used with a single power source to measure voltage and current. It works with single-supply levels and can correctly boost signals with low voltages or currents.

● Voltage Comparators

The LM2904DT can be used as a voltage comparator in single-supply systems to compare two input voltages and give digital outputs based on the results of the comparison. This could be useful for jobs like finding thresholds and making simple decisions.

Design Considerations

● Decoupling Capacitors

Place decoupling capacitors near the power supply pins of the LM2904DT to provide stable and clean power. These capacitors help filter out high-frequency noise and provide a local reservoir of charge for the amplifier. Use ceramic capacitors with low equivalent series resistance (ESR) for better performance.

● Input Coupling

When coupling signals to the LM2904DT’s inputs, use coupling capacitors to block any DC offset or bias voltage. This prevents the amplifier from being affected by input voltage drift or offset. The value of the coupling capacitor should be chosen based on the desired frequency response and signal bandwidth.

● Output Coupling

If you need to drive a load that requires AC coupling, use an output coupling capacitor to block any DC components. This prevents any DC bias from being transmitted to the load. The value of the output coupling capacitor depends on the load impedance and desired frequency response.

● Avoid thermal issues.

Consider the power dissipation of the LM2904DT and ensure it remains within the specified limits. Provide sufficient heat sinking if necessary, especially if the amplifier operates at high supply voltages or handles high currents. Thermal issues can affect the amplifier’s performance and reliability.

● Stability and Compensation

To ensure stability, you may need to compensate the LM2904DT by adding a feedback capacitor in parallel with the feedback resistor. This compensation capacitor helps stabilise the amplifier by reducing phase shifts at high frequencies. Consult the LM2904DT datasheet or application notes for recommended compensation techniques.

● Input and output protection

Consider adding input and output protection components such as resistors, diodes, or clamping circuits to safeguard the LM2904DT from excessive voltages, electrostatic discharge (ESD), or reverse currents. These protection measures help prevent damage to the amplifier and improve its robustness in real-world operating conditions.

Conclusion

The LM2904DT operational amplifier by STMicroelectronics is a highly reliable and versatile component widely utilised in electronic circuits. It offers exceptional performance across a range of applications, including signal conditioning, audio amplification, sensor interfaces, voltage and current measurement, and voltage comparators. Featuring two independent, high-gain operational amplifiers, the LM2904DT provides frequency compensation and operates seamlessly across a wide voltage range. It boasts a large DC voltage gain, low power consumption, and remarkable noise rejection capabilities for maintaining stable performance.

When designing circuits with the LM2904DT, it is recommended to incorporate decoupling capacitors for stable power, employ coupling capacitors for input and output coupling, and address any thermal concerns as needed. Additional considerations, such as compensation techniques and input/output protection components, can further enhance performance and ensure the amplifier’s longevity. In conclusion, the LM2904DT operational amplifier stands as a reliable and versatile choice that significantly enhances circuit performance across various applications, making it an invaluable tool for both engineers and enthusiasts. For more information or to place an order, please reach out to ICRFQ.

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