LM567/LM567C Tone Decoder General Description The LM567 and LM567C are general purpose tone decoders designed to provide a saturated transistor switch to ground when an input signal is present within the passband. The circuit consists of an I and Q detector driven by a voltage controlled oscillator which determines the center frequency of the decoder. External components are used to independently set center frequency, bandwidth and output delay. Features n 20 to 1 frequency range with an external resistor n Logic compatible output with 100 mA current sinking capability n Bandwidth adjustable from 0 to 14% n n n n High rejection of out of band signals and noise Immunity to false signals Highly stable center frequency Center frequency adjustable from 0.01 Hz to 500 kHz Applications n n n n n n n Touch tone decoding Precision oscillator Frequency monitoring and control Wide band FSK demodulation Ultrasonic controls Carrier current remote controls Communications paging decoders Connection Diagrams Metal Can Package Dual-In-Line and Small Outline Packages DS006975-1 Top View Order Number LM567H or LM567CH See NS Package Number H08C © 1999 National Semiconductor Corporation DS006975 DS006975-2 Top View Order Number LM567CM See NS Package Number M08A Order Number LM567CN See NS Package Number N08E www.national.com LM567/LM567C Tone Decoder May 1999 Absolute Maximum Ratings (Note 1) Operating Temperature Range LM567H −55˚C to +125˚C LM567CH, LM567CM, LM567CN 0˚C to +70˚C Soldering Information Dual-In-Line Package Soldering (10 sec.) 260˚C Small Outline Package Vapor Phase (60 sec.) 215˚C Infrared (15 sec.) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Pin Power Dissipation (Note 2) V8 V3 V3 Storage Temperature Range 9V 1100 mW 15V −10V V4 + 0.5V −65˚C to +150˚C Electrical Characteristics AC Test Circuit, TA = 25˚C, V+ = 5V Parameters LM567 Conditions Power Supply Voltage Range Power Supply Current Quiescent RL = 20k Power Supply Current Activated RL = 20k Input Resistance IL = 100 mA, fi = fo Largest No Output Input Voltage IC = 100 mA, fi = fo Max Min Typ Max 4.75 5.0 9.0 4.75 5.0 9.0 V 6 8 7 10 mA 11 13 12 15 mA 25 mVrms 10 15 25 15 Bn = 140 kHz 10 −6 12 Largest Detection Bandwidth Skew Largest Detection Bandwidth Variation with Temperature 16 1 2 ±1 Highest Center Frequency 100 Center Frequency Stability (4.75–5.75V) 0 < TA < 70 −55 < TA < +125 Center Frequency Shift with Supply Voltage 4.75V–6.75V 4.75V–9V 10 ±2 500 mVrms 6 dB dB 14 18 % of fo 2 3 % of fo ±1 100 1.0 2.0 fo/20 Fastest ON-OFF Cycling Rate 15 ± 0.1 35 ± 60 35 ± 140 0.5 kΩ −6 14 ± 0.1 4.75–6.75V 20 20 6 Largest Detection Bandwidth Largest Detection Bandwidth Variation with Supply Voltage 20 20 Largest Simultaneous Outband Signal to Inband Signal Ratio Minimum Input Signal to Wideband Noise Ratio Units Typ 18 Smallest Detectable Input Voltage LM567C/LM567CM Min %/˚C ±5 %V 500 kHz 35 ± 60 35 ± 140 ppm/˚C ppm/˚C 0.4 2.0 2.0 %/V %/V fo/20 Output Leakage Current V8 = 15V 0.01 25 0.01 25 µA Output Saturation Voltage ei = 25 mV, I8 = 30 mA ei = 25 mV, I8 = 100 mA 0.2 0.6 0.4 1.0 0.2 0.6 0.4 1.0 V Output Fall Time 30 30 ns Output Rise Time 150 150 ns 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, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. Note 2: The maximum junction temperature of the LM567 and LM567C is 150˚C. For operating at elevated temperatures, devices in the TO-5 package must be derated based on a thermal resistance of 150˚C/W, junction to ambient or 45˚C/W, junction to case. For the DIP the device must be derated based on a thermal resistance of 110˚C/W, junction to ambient. For the Small Outline package, the device must be derated based on a thermal resistance of 160˚C/W, junction to ambient. Note 3: Refer to RETS567X drawing for specifications of military LM567H version. www.national.com 2 Schematic Diagram DS006975-3 Typical Performance Characteristics Typical Frequency Drift Typical Bandwidth Variation DS006975-11 DS006975-10 3 Typical Frequency Drift DS006975-12 www.national.com Typical Performance Characteristics (Continued) Bandwidth vs Input Signal Amplitude Typical Frequency Drift DS006975-13 Largest Detection Bandwidth DS006975-15 DS006975-14 Detection Bandwidth as a Function of C2 and C3 Typical Supply Current vs Supply Voltage DS006975-17 DS006975-16 Typical Output Voltage vs Temperature DS006975-19 www.national.com Greatest Number of Cycles Before Output 4 DS006975-18 Typical Applications Touch-Tone Decoder DS006975-5 Component values (typ) R1 6.8 to 15k R2 4.7k R3 20k C1 0.10 mfd C2 1.0 mfd 6V C3 2.2 mfd 6V C4 250 mfd 6V 5 www.national.com Typical Applications (Continued) Oscillator with Quadrature Output Oscillator with Double Frequency Output DS006975-6 DS006975-7 Connect Pin 3 to 2.8V to Invert Output Precision Oscillator Drive 100 mA Loads DS006975-8 AC Test Circuit Applications Information The center frequency of the tone decoder is equal to the free running frequency of the VCO. This is given by The bandwidth of the filter may be found from the approximation Where: Vi = Input voltage (volts rms), Vi ≤ 200 mV C2 = Capacitance at Pin 2 (µF) DS006975-9 fi = 100 kHz + 5V *Note: Adjust for fo = 100 kHz. www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package (H) Order Number LM567H or LM567CH NS Package Number H08C Small Outline Package (M) Order Number LM567CM NS Package Number M08A 7 www.national.com LM567/LM567C Tone Decoder Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM567CN NS Package Number 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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