LMC567_15 TI1 | Alldatasheet
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÷2 ÷2 Product Folder Sample & Buy T echnical Documents Tools & Software Support & Community LMC567 SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015 LMC567Low-PowerToneDecoder
1 Features 3 Description
The LMC567 device is a low-power, general-purpose 1• Functionally Similar to LM567 LMCMOS tone decoder which is functionally similar• 2-V to 9-V Supply Voltage Range to the industry standard LM567. The device consists
- Low Supply Current Drain of a twice frequency voltage-controlled oscillator (VCO) and quadrature dividers which establish the• No Increase in Current With Output Activated reference signals for phase and amplitude detectors.• Operates to 500-kHz Input Frequency The phase detector and VCO form a phase-locked• High Oscillator Stability loop (PLL) which locks to an input signal frequency• Ground-Referenced Input which is within the control range of the VCO. When
- Hysteresis Added to Amplitude Comparator the PLL is locked and the input signal amplitude exceeds an internally pre-set threshold, a switch to• Out-of-Band Signals and Noise Rejected ground is activated on the output pin. External• 20-mA Output Current Capability components set up the oscillator to run at twice the input frequency and determine the phase and2 Applications amplitude filter time constants.
- Touch-Tone Decoding Device Information (1)
- Precision Oscillators PART NUMBER PACKAGE BODY SIZE (NOM)• Frequency Monitoring and Control LMC567 SOIC (8) 4.90 mm × 3.91 mm• Wide-Band FSK Demodulation (1) For all available packages, see the orderable addendum at• Ultrasonic Controls the end of the data sheet.
- Carrier Current Remote Controls
- Communications Paging Decoders Simplified Diagram An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015 www.ti.com Table of Contents
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (April 2013) to Revision C Page
- Added ESD Ratings table, Feature Description section, Device Functional Modes section, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Changes from Revision A (April 2013) to Revision B Page
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Product Folder Links: LMC567
www.ti.com SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015
5 Device Comparison Table
LMC567 Low power tone decoder General-purpose tone decoder with half oscillator frequency thanLM567, LM567C LMC567
6 Pin Configuration and Functions
TYPE(1) DESCRIPTION NAME NO. GND 7 PWR Ground connection IN 3 I Device input LF_CAP 2 I Loop filter capacitor terminal OF_CAP 1 I Output filter capacitor terminal OUT 8 O Device output T_CAP 5 I Timing capacitor connection terminal T_RES 6 I Timing resistor connection terminal VCC 4 PWR Voltage supply connection (1) I = input, O = output, PWR = power Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LMC567
f | f | 1007 f | u LMC567 SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015 www.ti.com
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)(2) MIN MAX UNIT Input voltage IN 2 Vp–p Supply voltage VCC 10 V Output voltage OUT 13 V Output current OUT 30 mA Package dissipation 500 mW Operating temperature, TA –25 125 °C Storage temperature, Tstg –55 150 °C (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications.
7.2 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT VCC Supply voltage 2 9 V FIN Input frequency 1 500 Hz TA Operating temperature –25 125 °C
7.3 Thermal Information
THERMAL METRIC(1) D (SOIC) UNIT
8 PINS
RθJA Junction-to-ambient thermal resistance 111.8 °C/W RθJC(top) Junction-to-case (top) thermal resistance 59.2 °C/W RθJB Junction-to-board thermal resistance 52.2 °C/W ψJT Junction-to-top characterization parameter 13.5 °C/W ψJB Junction-to-board characterization parameter 51.7 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.
7.4 Electrical Characteristics
Test Circuit, TA = 25°C, Vs = 5 V, RtCt #2, Sw. 1 Pos. 0, and no input, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Vs = 2 V 0.3 RtCt #1, quiescentI4 Power supply current Vs = 5 V 0.5 0.8 mAdcor activated Vs = 9 V 0.8 1.3 V3 Input D.C. bias 0 mVdc R3 Input resistance 40 kΩ I8 Output leakage 1 100 nAdc Vs = 2 V 98 Center frequency, RtCt #2, measure oscillatorf0 Vs = 5 V 92 103 113 kHzFosc ÷ 2 Frequency and divide by 2 Vs = V 105 Center frequencyΔf0 1 2 %/Vshift with supply (1)
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F | F |Skew 1 100 2 F | § · u¨ ¸ © ¹ OSC P2 OSC P1 OSC P0 F | F |L.D.B.W 100 F | u LMC567 www.ti.com SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015 Electrical Characteristics (continued) Test Circuit, TA = 25°C, Vs = 5 V, RtCt #2, Sw. 1 Pos. 0, and no input, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Vs = 2 V 11 20 27Set input frequency equal to f0 measured Vin Input threshold above. Increase input level until pin 8 goes Vs = 5 V 17 30 45 mVrms low. Vs = 9 V 45 Starting at input threshold, decrease inputΔVin Input hysteresis 1.5 mVrmslevel until pin 8 goes high. I8 = 2 mA 0.06 0.15Input level > thresholdV8 Output sat voltage VdcChoose RL for specified I8. I8 = 20 mA 0.7 Measure Fosc with Sw. 1 in Vs = 2 V 7% 11% 15% Vs = 9 V 15%(2) ΔBW Bandwidth skew 0% ±1.0% (3) Highest center RtCt #3fmax 700 kHzfrequency Measure oscillator frequency and divide by 2. Set input frequency equal to fmax measured above. IncreaseVin Input threshold at fmax 35 mVrmsinput level until pin 8 goes low. Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LMC567
7.5 Typical Characteristics
Figure 1. Supply Current vs Operating Frequency Figure 2. Bandwidth vs Input Signal Level Figure 3. Largest Detection Bandwidth vs Temperature Figure 4. Bandwidth as a Function of C2 Figure 5. Frequency Drift With Temperature Figure 6. Frequency Drift With Temperature
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8 Parameter Measurement Information
All parameters are measured according to the conditions described in Specifications.
8.1 Test Circuit
Figure 7 was used to make the measurements of the typical characteristics of the LMC567. Figure 7. LMC567 Test Circuit Table 1. Rt and Ct Values for the Test Circuit
1F Hz 2.8 RtCt# OSC 1F Hz 1.4 RtCt# VCO Phase Detector Amplitude Detector ÷2 ÷2 LMC567 SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015 www.ti.com
9 Detailed Description
9.1 Overview
The LMC567C is a low-power, general-purpose tone decoder with similar functionality to the industry standard LM567. The device requires external components set up the internal oscillator to run at twice the input frequency and determine the required filter constants. Internal VCO and Phase detector form a Phase-locked loop which locks to an input signal frequency that is established by external timing components. When PLL is locked, a switch to ground is activated in the output of the device.
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 Oscillator
The voltage-controlled oscillator (VCO) on the LMC567 must be set up to run at twice the frequency of the input signal tone to be decoded. The center frequency of the VCO is set by timing resistor Rt and timing capacitor Ct connected to pins 5 and 6 of the IC. The center frequency as a function of Rt and Ct is given by Equation 4: (4) Because this causes an input tone of half Fosc to be decoded by Equation 5, (5) Equation 5 is accurate at low frequencies; however, above 50 kHz (Fosc = 100 kHz), internal delays cause the actual frequency to be lower than predicted. The choice of Rt and Ct is a tradeoff between supply current and practical capacitor values. An additional supply current component is introduced in Equation 6 due to Rt being switched to Vs every half cycle to charge Ct: Is due to Rt = Vs/(4Rt) (6) Thus the supply current can be minimized by keeping Rt as large as possible (see Figure 1). However, the desired frequency dictates an RtCt product such that increasing Rt requires a smaller Ct. Below Ct = 100 pF, circuit board stray capacitances begin to play a role in determining the oscillation frequency which ultimately limits the minimum Ct. To allow for IC and component value tolerances, the oscillator timing components requires a trim. This is generally accomplished by using a variable resistor as part of Rt, although Ct could also be padded. The amount of initial frequency variation due to the LMC567 itself is given in the Electrical Characteristics; the total trim range must also accommodate the tolerances of Rt and Ct.
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www.ti.com SNOSBY1C –JUNE 1999–REVISED DECEMBER 2015 Feature Description (continued)
9.3.2 Input
The input pin 3 is internally ground-referenced with a nominal 40-kΩ resistor. Signals which are already centered on 0 V may be directly coupled to pin 3; however, any DC potential must be isolated through a coupling capacitor. Inputs of multiple LMC567 devices can be paralleled without individual DC isolation.
9.3.3 Loop Filter
Pin 2 is the combined output of the phase detector and control input of the VCO for the phase-locked loop (PLL). Capacitor C2 in conjunction with the nominal 80-kΩ pin 2 internal resistance forms the loop filter. For small values of C2, the PLL has a fast acquisition time and the pull-in range is set by the built in VCO frequency stops, which also determines the largest detection bandwidth (LDBW). Increasing C2 results in improved noise immunity at the expense of acquisition time, and the pull-in range begins to become narrower than the LDBW (see Figure 4). However, the maximum hold-in range always equal the LDBW.
9.3.4 Output Filter
Pin 1 is the output of a negative-going amplitude detector which has a nominal 0 signal output of 7/9 Vs. When the PLL is locked to the input, an increase in signal level causes the detector output to move negative. When pin 1 reaches 2/3 Vs, the output is activated (see Output). Capacitor C1 in conjunction with the nominal 40-kΩ pin 1 internal resistance forms the output filter. The size of C1 is a tradeoff between slew rate and carrier ripple at the output comparator. Low values of C1 produce the least delay between the input and output for tone burst applications, while larger values of C1 improve noise immunity. Pin 1 also provides a means for shifting the input threshold higher or lower by connecting an external resistor to supply or ground. However, reducing the threshold using this technique increases sensitivity to pin 1 carrier ripple and also results in more part to part threshold variation.
9.3.5 Output
The output at pin 8 is an N-channel FET switch to ground which is activated when the PLL is locked and the input tone is of sufficient amplitude to cause pin 1 to fall below 2/3 Vs. Apart from the obvious current component due to the external pin 8 load resistor, no additional supply current is required to activate the switch. The ON- resistance of the switch is inversely proportional to supply; thus the sat voltage for a given output current increases at lower supplies.
9.4 Device Functional Modes
9.4.1 Operation as LM567
The LMC567 low power tone decoder can be operated at supply voltages of 2 V to 9 V and at input frequencies ranging from 1 Hz up to 500 kHz. The LMC567 can be directly substituted in most LM567 applications with the following provisions: 1. Oscillator timing capacitor Ct must be halved to double the oscillator frequency relative to the input frequency (see Oscillator). 2. Filter capacitors C1 and C2 must be reduced by a factor of 8 to maintain the same filter time constants. 3. The output current demanded of pin 8 must be limited to the specified capability of the LMC567. Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LMC567
validate and test their design implementation to confirm system functionality.
10.1 Application Information
proper operation of the device in several popular use cases. additional design assistance. Also, join the audio amplifier discussion forum at e2e.ti.com.
10.2 Typical Application
Figure 8. LMC567 Application Schematic
10.2.1 Design Requirements
For this design example, use the parameters listed in Table 2. Table 2. Design Parameters
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10.2.2 Detailed Design Procedure
10.2.2.1 Timing Components
This approximation is valid with lower frequencies; considerations must be taken when using higher frequencies. More information on this can be found in Oscillator.
10.2.2.2 Bandwidth
following the behavior indicated in Figure 4. More information on this can be found in Loop Filter.
10.2.2.3 Output Filter
this can be found in Output Filter.
10.2.2.4 Supply Decoupling
requiring C4 to be placed as close as possible to pin 4.
10.2.3 Application Curve
Figure 9. Frequency Detection
11 Power Supply Recommendations
12 Layout
12.1 Layout Guidelines
12.2 Layout Example
Figure 10. LMC567 Board Layout
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13 Device and Documentation Support
13.1 Device Support
13.1.1 Development Support
For development support, see the following: support.ti.com
13.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.
13.3 Trademarks
E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.
13.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
13.5 Glossary
SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions.
14 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: LMC567
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