LM331 National Semiconductor, LM331 Datasheet
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LM331
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LM331 Summary of contents
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... Thus, it provides all the inherent advantages of the voltage-to-frequency conversion techniques, and is easy to apply in all standard voltage-to-frequency converter appli- cations. Further, the LM231A/LM331A attain a new high level of accuracy versus temperature which could only be attained with expensive voltage-to-frequency modules. Ad- ditionally the LM231/331 are ideally suited for use in digital ...
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... Electrical Characteristics All specifications apply in the circuit of Figure 4, with 4.0V ≤ V Parameter VFC Non-Linearity (Note 4) VFC Non-Linearity in Circuit of Figure 3 Conversion Accuracy Scale Factor (Gain) LM231, LM231A LM331, LM331A Temperature Stability of Gain LM231/LM331 LM231A/LM331A Change of Gain with V S Rated Full-Scale Frequency Gain Stability vs. Time (1000 Hours) ...
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... Electrical Characteristics All specifications apply in the circuit of Figure 4, with 4.0V ≤ V Parameter CURRENT SOURCE (Pin 1) LM231, LM231A, LM331, LM331A All Devices Operating Range of Current (Typical) REFERENCE VOLTAGE (Pin 2) LM231, LM231A LM331, LM331A Stability vs. Temperature Stability vs. Time, 1000 Hours LOGIC OUTPUT (Pin 3) ...
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Functional Block Diagram Pin numbers apply to 8-pin packages only. www.national.com FIGURE 1. 4 00568002 ...
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Typical Performance Characteristics (All electrical characteristics apply for the circuit of Figure 4, unless otherwise noted.) Nonlinearity Error as Precision V-to-F Converter (Figure 4) Nonlinearity Error vs. Power Supply Voltage V vs. Temperature REF 00568025 Frequency vs. Temperature 00568027 00568029 ...
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Typical Performance Characteristics 100 kHz Nonlinearity Error (Figure 5) Input Current (Pins 6,7) vs. Temperature Output Saturation Voltage vs. I (Pin 3) OUT www.national.com (Continued) 00568031 Power Drain vs. V 00568033 Nonlinearity Error, Precision F-to-V Converter (Figure 7) 00568035 6 ...
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Applications Information PRINCIPLES OF OPERATION The LM231/331 are monolithic circuits designed for accu- racy and versatile operation when applied as voltage-to- frequency (V-to-F) converters or as frequency-to-voltage (F- to-V) converters. A simplified block diagram of the LM231/ 331 is shown ...
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Applications Information A 47Ω resistor, in series with the 1 µF C esis, which helps the input comparator provide the excellent linearity. *Use stable components with low temperature coefficients. See Typical Applications section. **0.1µF or 1µF, See “Principles of Operation.” ...
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Applications Information DETAILS OF OPERATION: F-to-V CONVERTERS (Figure 6 and Figure 7) In these applications, a pulse input C-R network and the negative-going edge at pin 6 causes the input comparator to trigger the timer circuit. Just ...
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Applications Information *Use stable components with low temperature coefficients. *Use stable components with low temperature coefficients. FIGURE 7. Precision Frequency-to-Voltage Converter, www.national.com (Continued) FIGURE 6. Simple Frequency-to-Voltage Converter, ± 10 kHz Full-Scale, 0.06% Non-Linearity 10 kHz Full-Scale with 2-Pole Filter, ...
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Applications Information *L14F-1, L14G-1 or L14H-1, photo transistor (General Electric Co.) or similar Long-Term Digital Integrator Using VFC Analog-to-Digital Converter with Microprocessor (Continued) Light Intensity to Frequency Converter Temperature to Frequency Converter Basic Analog-to-Digital Converter Using Voltage-to-Frequency Converter 00568011 11 ...
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Applications Information Remote Voltage-to-Frequency Converter with 2-Wire Transmitter and Receiver Voltage-to-Frequency Converter with Square-Wave Output Using ÷ 2 Flip-Flop www.national.com (Continued) Voltage-to-Frequency Converter with Isolators 12 00568014 00568015 00568016 ...
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Applications Information Voltage-to-Frequency Converter with Isolators Voltage-to-Frequency Converter with Isolators Voltage-to-Frequency Converter with Isolators (Continued) 13 00568017 00568018 00568019 www.national.com ...
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... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM231AN, LM231N, LM331AN, or LM331N National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. ...