LMF380

LMF380 NSC | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 12

Technical content

Features

Y Three bandpass filters with one-third octave center fre- quency spacing Y Choice of internal or external clock Y No external components other than clock or crystal and two capacitors Key Specifications Y Passband gain accuracy: Better than 0.7 dB over temperature Y Supply voltage range: g2V to g7.5V or a4V to a14V

Applications

Y Real-Time Audio Analyzers (ANSI Type E, Class II) Y Acoustical Instrumentation Y Noise Testing Simplified Block Diagram TL/H/11123–1 C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Notes1&2 ) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Total Supply Voltage b0.3V to a16V Voltage at Any Pin V b b 0.3V to V a a 0.3V Input Current per Pin (Note 3) g5m A Total Input Current (Note 3) g20 mA Lead Temperature (Soldering 10 sec.) Dual-In-Line Package (Plastic) 300 §C Surface Mount Package (Note 4) Vapor Phase (60 seconds) 215 §C Infrared (15 seconds) 220 §C Power Dissipation (Note 5) 500 mW Maximum Junction Temperature 150 §C Storage Temperature Range b65§Ct o a150§C ESD Susceptibility (Note 6) 2000V Operating Ratings (Note 1) Temperature Range T MIN s TA s TMAX LMF380CIN, LMF380CIV, LMF380CIJ b40§C s TA s a85§C LMF380CMJ b55§C s TA s a125§C Supply Voltage (V a b Vb) 4.0V to 14V Clock Input Frequency 10 Hz to 1.25 MHz Filter Electrical Characteristics The following specifications apply for V a ea 5V, V b eb 5V, and f CLK e 320 kHz unless otherwise specified. Boldface limits apply for T MIN to T MAX; all other limits apply for T A e TJ e 25§C. Symbol Parameter Conditions Typical Limit Units (Note 7) (Note 8) (Limit) fCLK:f01 Clock-to-Center-Frequency Ratio, Filter 1 50:1 fCLK:f02 Clock-to-Center-Frequency Ratio, Filter 2 62.5:1 fCLK:f03 Clock-to-Center-Frequency Ratio, Filter 3 80:1 A1 Gain at f 1 e 3720 Hz (Filter 1), (Note 9) b32 b30 dB (max)2960 Hz (Filter 2), 2340 Hz (Filter 3) A2 Gain at f 2 e 6080 Hz (Filter 1), (Note 9) a0.1 0.1 g 0.7 dB (max)4820 Hz (Filter 2), 3820 Hz (Filter 3) A3 Gain at f 3 e 6200 Hz (Filter 1), (Note 9 0.0 b0.0 g 0.7 dB (max)4960 Hz (Filter 2), 3940 Hz (Filter 3) A4 Gain at f 4 e 6400 Hz (Filter 1), (Note 9) b0.2 b0.2 g 0.7 dB (max)5080 Hz (Filter 2), 4040 Hz (Filter 3) A5 Gain at f 5 e 6540 Hz (Filter 1), (Note 9) b0.1 b0.1 g 0.7 dB (max)5180 Hz (Filter 2), 4120 Hz (Filter 3) A6 Gain at f 6 e 6720 Hz (Filter 1), (Note 9) a0.15 b0.15 g 0.7 dB (max)5340 Hz (Filter 2), 4240 Hz (Filter 3) A7 Gain at f 7 e 8900 Hz (Filter 1), (Note 9) b22 b20 dB (max)7060 Hz (Filter 2), 5600 Hz (Filter 3) VOS Output Offset Voltage, Each Filter a50 a120 mV (max) b30 mV (min) En Total Output Noise, OUT1 0.1 Hz to 20 kHz 240 Total Output Noise, OUT2 210 mVrms Total Output Noise, OUT3 190 CL Maximum Capacitive Load 200 pF Crosstalk V IN e 1 Vrms, f e fO b67 dB Clock Feedthrough, Each Filter V a ea 5V, V b eb 5V 10 mV p-p VOUT Output Voltage Swing R L e 5k X a4.2 a3.8 V (min) b4.6 b4.2 V (max) THD Total Harmonic Distortion V IN e 1 Vrms, f e fO 0.05 % IS Supply Current 6.0 9.0 mA (max)

Logic Input and Output Electrical Characteristics The following specifications for V a ea 5V and V b eb 5V unless otherwise specified. Boldface limits apply for T MIN to TMAX; all other limits apply for T A e TJ ea 25§C. Symbol Parameter Conditions (Note 7) Typical Tested (Limit) UnitsLimit (Note 8) VIH XTAL1 Logical ‘‘1’’ V a e 5V, V b eb 5V a3.0 V (min) VIL CMOS Clock Logical ‘‘0’’ b3.0 V (max) VIH Input Voltage Logical ‘‘1’’ V a e 10V, V b e 0V a8.0 V (min) VIL Logical ‘‘0’’ a2.0 V (max) VIH Logical ‘‘1’’ V a e 2.5V, V b eb 2.5V a1.5 V (min) VIL Logical ‘‘0’’ b1.5 V (max) VIH Logical ‘‘1’’ V a e 5V, V b e 0V a4.0 V (min) VIL Logical ‘‘0’’ a1.0 V (max) VOH Clock Output Logical ‘‘1’’ I OUT eb 1m A V a b 1.0 V (min) VOL Clock Output Logical ‘‘0’’ I OUT ea 1m A V b a 1.0 V (max) IIN Input Current XTAL1 g20 mA (max) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional. These ratings do not guarantee specific performance limits, however. For guaranteed specifications and test conditions, see the Electrical Characteris- tics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: All voltages are measured with respect to GND unless otherwise specified. Note 3: When the input voltage (V IN) at any pin exceeds the power supplies (V IN k Vb or V IN l Va), the current at that pin should be limited to 5 mA. The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four. Note 4: See AN450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ or the section titled ‘‘Surface Mount’’ found in any volume of the Linear Data Book Rev. 1 for other methods of soldering surface mount devices. Note 5: The maximum power dissipation must be derated at elevated temperatures and is a function of T Jmax, iJA, and the ambient temperature, T A. The maximum allowable power dissipation at any temperature is P D e (TJmax b TA)/iJA or the number given in the Absolute Maximum Ratings, whichever is lower. For guaranteed operation, T Jmax e 125§C. The typical thermal resistance ( iJA) of the LMF380N when board-mounted is 51 §C.W. iJA is typically 52 §C/W for the LMF380J, and 86 §C/W for the LMF380V. Note 6: Human body model, 100 pF discharged through a 1.5 k X resistor. Note 7: Typicals are at T J e 25§C and represent the most likely parametric norm. Note 8: Limits are guaranteed to National’s Averge Outgoing Quality Level (AOQL). frequencies listed in the table may differ slightly from the nominal values.

Typical Performance Characteristics vs Power Supply Voltage Power Supply Current vs Temperature Power Supply Current vs Load Resistance Positive Output Swing vs Load Resistance Negative Output Swing vs Temperature Positive Output Swing vs Temperature Negative Output Swing vs Supply Voltage Offset Voltage vs Temperature Offset Voltage vs Clock Frequency Offset Voltage TL/H/11123–4

FIGURE 3. Complete, one-third octave filter set for the entire audio frequency range. Ten LMF380s provide the thirty numbers are for the dual-in-line package.

FIGURE 4. Examples of detectors for audio signals. (a) Half-wave peak detector. (b) Half-wave average detector. be bypassed with at least 0.1 mF close to the amplifiers.

FIGURE 5. LED display using LM3915 bar graph driver. The input voltage range is 2V full-scale, with 3 dB per step.

Physical Dimensions inches (millimeters) Dual-In-Line Package (J) Order Number LMF380C1J or LMF380CMJ Dual-In-Line Package (N) Order Number LMF380CIN

LMF380 Triple One-Third Octave Switched-Capacitor Active Filter Physical Dimensions inches (millimeters) (Continued) Plastic Chip Carrier Package (V) Order Number LMF380CIV 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.

1111 West Bardin Road Fax: (

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.