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AD650AD 데이터시트(PDF) 1 Page - Analog Devices |
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AD650AD 데이터시트(HTML) 1 Page - Analog Devices |
1 / 12 page PIN CONFIGURATION REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Voltage-to-Frequency and Frequency-to-Voltage Converter AD650 FEATURES V/F Conversion to 1 MHz Reliable Monolithic Construction Very Low Nonlinearity 0.002% typ at 10 kHz 0.005% typ at 100 kHz 0.07% typ at 1 MHz Input Offset Trimmable to Zero CMOS or TTL Compatible Unipolar, Bipolar, or Differential V/F V/F or F/V Conversion Available in Surface Mount MIL-STD-883 Compliant Versions Available PRODUCT DESCRIPTION The AD650 V/F/V (voltage-to-frequency or frequency-to-voltage converter) provides a combination of high frequency operation and low nonlinearity previously unavailable in monolithic form. The inherent monotonicity of the V/F transfer function makes the AD650 useful as a high-resolution analog-to-digital converter. A flexible input configuration allows a wide variety of input volt- age and current formats to be used, and an open-collector output with separate digital ground allows simple interfacing to either standard logic families or opto-couplers. The linearity error of the AD650 is typically 20 ppm (0.002% of full scale) and 50 ppm (0.005%) maximum at 10 kHz full scale. This corresponds to approximately 14-bit linearity in an analog-to-digital converter circuit. Higher full-scale frequencies or longer count intervals can be used for higher resolution con- versions. The AD650 has a useful dynamic range of six decades allowing extremely high resolution measurements. Even at 1 MHz full scale, linearity is guaranteed less than 1000 ppm (0.1%) on the AD650KN, BD, and SD grades. In addition to analog-to-digital conversion, the AD650 can be used in isolated analog signal transmission applications, phased locked- loop circuits, and precision stepper motor speed controllers. In the F/V mode, the AD650 can be used in precision tachometer and FM demodulator circuits. The input signal range and full-scale output frequency are user- programmable with two external capacitors and one resistor. Input offset voltage can be trimmed to zero with an external potentiometer. The AD650JN and AD650KN are offered in a plastic 14-lead DIP package. The AD650JP is available in a 20-lead plastic leaded chip carrier (PLCC). Both plastic packaged versions of the AD650 are specified for the commercial (0 °C to +70°C) tempera- ture range. For industrial temperature range (–25 °C to +85°C) applications, the AD650AD and AD650BD are offered in a ceramic package. The AD650SD is specified for the full –55 °C to +125 °C extended temperature range. PRODUCT HIGHLIGHTS 1. In addition to very high linearity, the AD650 can operate at full-scale output frequency up to 1 MHz. The combination of these two features makes the AD650 an inexpensive solution for applications requiring high resolution monotonic A/D conversion. 2. The AD650 has a very versatile architecture that can be con- figured to accommodate bipolar, unipolar, or differential input voltages, or unipolar input currents. 3. TTL or CMOS compatibility is achieved using an open collector frequency output. The pull-up resistor can be connected to voltages up to +30 V, or +15 V or +5 V for conventional CMOS or TTL logic levels. 4. The same components used for V/F conversion can also be used for F/V conversion by adding a simple logic biasing net- work and reconfiguring the AD650. 5. The AD650 provides separate analog and digital grounds. This feature allows prevention of ground loops in real-world applications. 6. The AD650 is available in versions compliant with MIL- STD-883. Refer to the Analog Devices Military Products Databook or current AD650/883B data sheet for detailed specifications. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 |
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