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LM331

V-F Converter
Features
• • • • • Guaranteed linearity: 0.01% max. Low power dissipation: 15mW at 5V Wide range of full scale frequency: 1Hz to 100KHz Pulse outputcompatible with all logic forms Wide dynamic range: 100dB min at 10KHz full scale frequency

Description
This voltage to frequency converter provides the output pulse train at a frequency preciselyproportional to the applied input voltage. The LM331 can operate at power supplies as low as 4.0V and be changed output frequency from 1Hz to 100KHz. It is ideally suited for use in simple low costcircuit for analog-to digital conversion, long term integration, linear frequency modulation or demodulation, frequency to voltage conversion, and many other functions.

8-DIP

1

Internal BlockDiagram

Rev. 1.0.0
©2001 Fairchild Semiconductor Corporation

LM331

Absolute Maximum Ratings (TA = 25°C) °
Parameter Supply Voltage Input Voltage Operating Temperature Range PowerDissipation Symbol VCC VI TOPR PD Value 40 -0.2 ~ + VCC 0 ~ +70 500 Unit V V °C mW

Electrical Characteristics
Parameter VFC Non-Linearity Conversion Accuracy Scale Factor Chang Of Gain With VCC Rated Full- Scale Frequency INPUT COMPARATOR Offset Voltage Bias Current Offset Current Common-Mode Range TIMER (PIN 5) Timer Threshold Voltage Input Bias Current VTH IBIAS VCC = 15V, 0V ≤ V5 ≤ 9.9V V5 = 10VSaturation Voltage CURRENT SOURCE (PIN 1) Output Current Change with Voltage Current Source Off Leakage REFERENCE VOLTAGE (PIN 2) Reference Voltage Stability vs Temperature Stability vs Time, 1000HoursLOGIC OUTPUT (Pin 3) Saturation Voltage Off Leakage SUPPLY CURRENT Supply Current ICC VCC = 5V VCC = 40V 1.5 2.0 3.0 4.0 6.0 8.0 mA VSAT ILKG I = 5mA I = 3.2mA 0.15 0.10 ±0.05 0.50 0.40 1.0 V µA VREFSTT STT 1.70 1.89 ±60 ±0.1 2.08 VDC ppm/°C % IO ∆IO/∆V1 ILKG RS = 14KΩ, V1= 0V 0V ≤ V1 ≤ 10V 116 136 0.2 0.02 156 1.0 10.0 µA µA nA VSAT I = 5mA 0.63 0.667 ±10 200 0.22 0.701 ±100 1000 0.5 ×VCC nA...