AD7740KRMZ-REEL

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AD7740KRMZ-REEL is an integrated circuit (IC), an application specific integrated circuit (ASIC) based converter made by Analog Devices(ADI). It is a precision, high-performance, low-power, voltage/frequency (V/F) and frequency/voltage (F/V) converter IC for medical electronics and professional audio applications. It is designed for generating accurate sinusoidal voltage or frequency outputs with high stability over a wide range of temperature and supply voltage conditions. The AD7740KRMZ-REEL utilizes a low power advanced charge-pump oscillator section, followed by an adjustable frequency-to-voltage converter and a voltage-to-frequency converter.

AD7740KRMZ-REEL Application Field

AD7740KRMZ-REEL is used in a wide variety of medical device applications, such as biosignal amplifiers, pulse oximeters, impedance pneumographs, drug delivery systems, and patient monitoring systems. This IC provides a fast, accurate and reliable method of converting an input voltage to an output frequency or vice versa, allowing the tracking of the electrical impedance signals of bio-objects during medical activities such as sleep stages classification.

It is also used in professional audio applications, such as audio processors, equalizers, and sound mixers. As it provides better accuracy, stability and low power consumption for these applications, AD7740KRMZ-REEL is used as comparators, analog/digital converters, level setting, and time delays.

AD7740KRMZ-REEL Working Principle

The working principle of the AD7740KRMZ-REEL consists of an oscillator section and a programmable converter section. First, the oscillator section contains a voltage controlled oscillator (VCO) which is powered by an energy-saving, low-power charge-pump circuit and two adjustable reference currents. This oscillator generates a sinusoidal output at a frequency that is dependent on the voltage of the input signal. The frequency of the output signal is determined by two reference currents, which set the output frequency. For example, if the frequency of the input signal is increased, the reference currents increase proportionally.

Next, the second section of the circuit is the voltage-to-frequency (F/V) converter (or frequency-to-voltage (V/F) converter, depending on which output is used). This section is used to convert the sinusoidal output of the oscillator section into a voltage or frequency output depending on the needs of the application. The frequency-to-voltage output is derived from a cascaded voltage follower, while the voltage-to-frequency output is generated by a frequency prescale and dual AGC circuit. The output is then filtered and amplified before being sent to the non-inverting output.

The AD7740KRMZ-REEL also includes various accessories, such as an on-chip temperature sensor, EMI filter, and over-temperature protection, which make it more suitable for medical and professional audio applications. The device is available in the 8-pin SOIC (small-outline integrated circuit) package, with a pin-compatible evaluation board for testing purposes.

Overall, the AD7740KRMZ-REEL is an excellent application specific integrated circuit of voltage/frequency and frequency/voltage converters for medical and professional audio applications. Its low-power charge-pump oscillator section combined with adjustable reference currents allows it to generate sinusoidal output of accurate and stable frequency. Then its frequency-to-voltage and voltage-to-frequency converters enable the device to perform precision and low-power conversion between input voltage and output frequency.

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