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AD537JH application field and working principle

The AD537JH is a programmable analog-to-digital, or digital-to-analog converter designed for use in voltage-to-frequency (V/F) and frequency-to-voltage (F/V) conversion applications. It is also suitable for driving displays or for generating modulated frequency pulses.

Application Field

The AD537JH is specifically designed for use in voltage-to-frequency and frequency-to-voltage conversion applications. It has two input/output terminal pairs, with one input/output pair designed for V/F conversion and the other for F/V conversion. With its wide input voltage range and flexible programming, the AD537JH can be used to accurately convert between signals in a variety of applications, including process control and instrumentation, power management, and analog computing.

The AD537JH is also suitable for driving low-voltage logic displays, such as LED and LCD displays, as well as for generating modulated frequency pulses in frequency multipliers, frequency synthesizers, VCOs, and frequency-selective waveform generators.

Working Principle

The AD537JH is a two-stage, low-power, 12-bit converter with full-scale voltage settings from +20V to -20V or unipolar voltage settings from 0V to +20V. The converter can accept both single-ended and differential input signals for V/F and F/V applications. The two input/output terminal pairs can be programmed to accept a variety of input/output signals in either bipolar or unipolar mode.

In V/F applications, the input voltage is converted to an equivalent frequency, which is then generated at the output. In F/V applications, the input frequency is converted to a proportional voltage at the output. The AD537JH has an integrated voltage-to-frequency and frequency-to-voltage conversion factor of 11.8. This results in a maximum output frequency of 111kHz (for a full-scale input of +20V), or a maximum output voltage of +25V (for a full-scale input frequency of 500kHz).

The AD537JH includes an internal voltage reference and an integrated oscillator, which eliminates the need for external components. The converter can be programmed via four digital logic inputs, or directly via an internal register. Programmable parameters include input/output range, gain, offset, and slew rate. The converter can be configured for various output modes, including pulse, square wave, and pulse-width modulated (PWM).

Conclusion

The AD537JH is a versatile integrated converter that can be used in a variety of V/F and F/V conversion applications. It has a wide input voltage range and can be programmed to accept a variety of input/output signals in either bipolar or unipolar mode. With its integrated voltage reference, internal oscillator, and programmable parameters, the AD537JH is an ideal solution for driving displays or for generating modulated frequency pulses in various frequency-based applications.

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