LM131A NSC | Alldatasheet

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Technical content

Features

Y Guaranteed linearity 0.01% max Y Improved performance in existing voltage-to-frequency conversion applications Y Split or single supply operation Y Operates on single 5V supply Y Pulse output compatible with all logic forms Y Excellent temperature stability, g50 ppm/ §C max Y Low power dissipation, 15 mW typical at 5V Y Wide dynamic range, 100 dB min at 10 kHz full scale frequency Y Wide range of full scale frequency, 1 Hz to 100 kHz Y Low cost Typical Applications TL/H/5680–1 *Use stable components with low temperature coefficients. See Typical Applications section. fOUT e VIN

2.09 V # RS

# 1 RtCt **0.1mFo r1 mF, See ‘‘Principles of Operation.’’ FIGURE 1. Simple Stand-Alone Voltage-to-Frequency Converter C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LM131A/LM131 LM231A/LM231 LM331A/LM331 Supply Voltage 40V 40V 40V Output Short Circuit to Ground Continuous Continuous Continuous Output Short Circuit to V CC Continuous Continuous Continuous Input Voltage b0.2V to aVS b0.2V to aVS b0.2V to aVS TMIN TMAX TMIN TMAX TMIN TMAX Operating Ambient Temperature Range b55§Ct o a125§C b25§Ct o a85§C0 §Ct o a70§C Power Dissipation (P D at 25 §C) and Thermal Resistance ( ijA) (H Package) P D 670 mW ijA 150§C/W (N Package) P D 1.25W 1.25W ijA 100§C/W 100 §C/W (M Package) P D 1.25W iJA 85§C/W Lead Temperature (Soldering, 10 sec.) Dual-In-Line Package (Plastic) 260 §C 260 §C 260 §C Metal Can Package (TO-5) 260 §C ESD Susceptibility (Note 4) Metal Can Package (TO-5) 2000V Other Packages 500V 500V Electrical Characteristics TAe25§C unless otherwise specified (Note 2) Parameter Conditions Min Typ Max Units VFC Non-Linearity (Note 3) 4.5V s VS s 20V g0.003 g0.01 % Full- Scale TMIN s TA s TMAX g0.006 g0.02 % Full- Scale VFC Non-Linearity V S e 15V, f e 10 Hz to 11 kHz g0.024 g0.14 %Full- In Circuit of Figure 1 Scale Conversion Accuracy Scale Factor (Gain) V IN eb 10V, R S e 14 k X LM131, LM131A, LM231, LM231A 0.95 1.00 1.05 kHz/V LM331, LM331A 0.90 1.00 1.10 kHz/V Temperature Stability of Gain T MIN s TA s TMAX, 4.5V s VS s 20V LM131/LM231/LM331 g30 g150 ppm/ §C LM131A/LM231A/LM331A g20 g50 ppm/ §C Change of Gain with V S 4.5VsVS s 10V 0.01 0.1 %/V 10V s VS s 40V 0.006 0.06 %/V Rated Full-Scale Frequency V IN eb 10V 10.0 kHz Gain Stability vs Time T MIN s TA s TMAX g0.02 % Full- (1000 Hrs) Scale Overrange (Beyond Full-Scale) Frequency V IN eb 11V 10 % INPUT COMPARATOR Offset Voltage g3 g10 mV LM131/LM231/LM331 T MIN s TA s TMAX g4 g14 mV LM131A/LM231A/LM331A T MIN s TA s TMAX g3 g10 mV Bias Current b80 b300 nA Offset Current g8 g100 nA Common-Mode Range T MIN s TA s TMAX b0.2 V CCb2.0 V

Electrical Characteristics TAe25§C unless otherwise specified (Note 2) (Continued) Parameter Conditions Min Typ Max Units TIMER Timer Threshold Voltage, Pin 5 0.63 0.667 0.70 c VS Input Bias Current, Pin 5 V S e 15V All Devices 0V sVPIN 5 s 9.9V g10 g100 nA LM131/LM231/LM331 V PIN 5 e 10V 200 1000 nA LM131A/LM231A/LM331A V PIN 5 e 10V 200 500 nA VSAT PIN 5 (Reset) I e 5 mA 0.22 0.5 V CURRENT SOURCE (Pin 1) Output Current R Se14 k X,V PIN 1 e0 LM131, LM131A, LM231, LM231A 126 135 144 mA LM331, LM331A 116 136 156 mA Change with Voltage 0V sVPIN 1 s10V 0.2 1.0 mA Current Source OFF Leakage LM131, LM131A 0.01 1.0 nA LM231, LM231A, LM331, LM331A 0.02 10.0 nA All Devices T AeTMAX 2.0 50.0 nA Operating Range of Current (Typical) (10 to 500) mA REFERENCE VOLTAGE (Pin 2) LM131, LM131A, LM231, LM231A 1.76 1.89 2.02 V DC LM331, LM331A 1.70 1.89 2.08 V DC Stability vs Temperature g60 ppm/ §C Stability vs Time, 1000 Hours g0.1 % LOGIC OUTPUT (Pin 3) VSAT Ie5 mA 0.15 0.50 V Ie3.2 mA (2 TTL Loads), T MINsTAsTMAX 0.10 0.40 V OFF Leakage g0.05 1.0 mA SUPPLY CURRENT LM131, LM131A, LM231, V Se5V 2.0 3.0 4.0 mA LM231A V Se40V 2.5 4.0 6.0 mA LM331, LM331A V Se5V 1.5 3.0 6.0 mA VSe40V 2.0 4.0 8.0 mA Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its specified operating conditions. Note 2: All specifications apply in the circuit of Figure 3 , with 4.0V sVSs40V, unless otherwise noted. Note 3: Nonlinearity is defined as the deviation of f OUT from V IN c (10 kHz/ b10 V DC) when the circuit has been trimmed for zero error at 10 Hz and at 10 kHz, over the frequency range 1 Hz to 11 kHz. For the timing capacitor, C T, use NPO ceramic, Teflon É, or polystyrene. Note 4: Human body model, 100 pF discharged through a 1.5 k X resistor.

TL/H/5680–2 Pin numbers apply to 8-pin packages only. See connection diagram for LM231WM pin numbers. FIGURE 1a TeflonÉ registered trademark of DuPont

than C L, a step at V IN may cause f OUT to stop momentarily. the excellent linearity (0.03% typical). tional operational amplifier and feedback capacitor, C F. level at pin 6 of the LM131, the timing cycle is initiated. output pulses’ spacing can be measured. but with the necessary changes for high speed operation. *Use stable components with low temperature coefficients. See Typical Applications section. **This resistor can be 5 k X or 10 k X for V Se8V to 22V, but must be 10 k X for V Se4.5V to 8V. FIGURE 3. Standard Test Circuit and Applications Circuit, Precision Voltage-to-Frequency Converter

Typical Applications (Continued) Light Intensity to Frequency Converter TL/H/5680–9 *L14F-1, L14G-1 or L14H-1, photo transistor (General Electric Co.) or similar Temperature to Frequency Converter TL/H/5680–10 Long-Term Digital Integrator Using VFC TL/H/5680–11 Basic Analog-to-Digital Converter Using Voltage-to-Frequency Converter TL/H/5680–12

Typical Applications (Continued) Analog-to-Digital Converter with Microprocessor TL/H/5680–13 Remote Voltage-to-Frequency Converter with 2-Wire Transmitter and Receiver TL/H/5680–14 Voltage-to-Frequency Converter with Square-Wave Output Using d2 Flip-Flop TL/H/5680–15 Voltage-to-Frequency Converter with Isolators TL/H/5680–16

Typical Applications (Continued) Voltage-to-Frequency Converter with Isolators TL/H/5680–17 Voltage-to-Frequency Converter with Isolators TL/H/5680–18 Voltage-to-Frequency Converter with Isolators TL/H/5680–19

TL/H/5680–20 Note: Metal case is connected to pin 4 (GND.) Order Number LM131H/883 or LM131AH/883 See NS Package Number H08C Dual-In-Line Package TL/H/5680–21 Order Number LM231AN, LM231N, LM331AN, or LM331N See NS Package Number N08E Small-Outline Package TL/H/5680–24 Top View Order Number LM231WM See NS Package Number M14B

TL/H/5680–22

Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM131H/883 or LM131AH/883 14-Pin Small Outline Package (M) Order Number LM231WM

LM131A/LM131, LM231A/LM231, LM331A/LM331 Precision Voltage-to-Frequency Converters Physical Dimensions inches (millimeters) (Continued) Dual-In-Line Package (N) Order Number LM231AN, LM231N, LM331AN, or LM331N NS package N08E LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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a49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309 Arlington, TX 76017 Email: cnjwge @ tevm2.nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: ( a49) 0-180-530 85 85 Tsimshatsui, Kowloon Fax: 1(800) 737-7018 English Tel: ( a49) 0-180-532 78 32 Hong Kong Fran3ais Tel: ( a49) 0-180-532 93 58 Tel: (852) 2737-1600 Italiano Tel: ( a49) 0-180-534 16 80 Fax: (852) 2736-9960 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.