LTC1542CDD#PBF

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The LTC1542CDD#PBF is a high speed single-channel current feedback amplifier that excels in providing superior performance in audio and high end video applications. Operating over a wide bandwidth, from dc to several MHz, it is an ideal amplifier for driving active transducers and electro-acoustic speakers in low voltage, low power, portable or battery operated applications. It offers industry leading open-loop wide-bandwidth, fast slew rate, and low distortion performance. Additionally, the LTC1542CDD#PBF is capable of providing very wide input and feedback common mode range (CMRR), and excellent in-band voltage gain stability.

Application Fields

The LTC1542CDD#PBF provides outstanding performance in many audio and consumer electronics applications, and is suitable for driving high-fidelity speakers in biosensors, measurement instruments and dynamic audio systems. Its high power output, low power consumption and small size make it an ideal choice for consumer audio and professional audio systems. Additionally, high-end digital video applications, such as DVD players and digital displays, benefit from its fast slew rate, excellent CMRR, and high speed response. It is also an ideal amplifier for driving electro-acoustic transducers such as ultrasonic imaging transducers, ultrasonic flowmeters, sonar transducers and piezoelectric transducers.

Working Principle

The LTC1542CDD#PBF is dependent on a current-feedback principle in order to achieve its excellent performance. This means that the signal being amplified is converted from voltage to current form before the actual amplification is done. To operate the amplifier, two supplies are required: a positive and a negative supply. The LTC1542CDD#PBF is able to operate directly from ±2.7 to ±36 volts, or a single supply of 5.4 to ±36 volts is also allowed. A current-feedback design also eliminates the need for an external level translator, allowing the LTC1542CDD#PBF to accept differential input signals. The same differential inputs can handle a wide range of input voltage levels, including single-ended input voltages of up to ±3 volts.

The core of the LTC1542CDD#PBF is a unity-gain stable differential amplifier, capable of delivering excellent linearity and low-noise performance without any external components. The amplifier is designed for single-ended or differential operation and is capable of driving exceptional high output power which is more than adequate for piezoelectric transducers and electro-acoustic speakers. Additionally, the LTC1542CDD#PBF is capable of accepting a wide range of input signals, covering the entire audio frequency range up to 20 MHz, allowing it to be used in applications such as voice-activated sonar navigation systems.

The LTC1542CDD#PBF offers excellent noise performance as well. It is able to produce a low noise output of 80nV/VHz, which is significantly lower than other amplifiers in its class. Additionally, the LTC1542CDD#PBF is highly efficient and operates without creating a large amount of heat, making it ideal for battery operated systems. The amplifier also offers class leading slew rate, which is up to 20V/us, and a very fast response time of 250ns. This makes it ideal for high frequency signals, such as those found in video applications. All of these excellent performance indicators make the LTC1542CDD#PBF an ideal choice for audio, video, and consumer electronics applications.

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