Overview
The LM567CMX, produced by Texas Instruments, is a general-purpose tone decoder designed to provide a saturated transistor switch to ground when an input signal is present within the specified passband. This device is part of the LM567 and LM567C family, which are widely used in various communication and control applications. The LM567CMX features a voltage-controlled oscillator (VCO) that determines the center frequency of the decoder, and it includes I and Q detectors to ensure accurate signal detection. External components can be used to set the center frequency, bandwidth, and output delay independently, making it highly versatile for different applications.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage (VCC) | 3.5 | 8.5 | V |
| Input Voltage Level (VIN) | -8.5 | 8.5 | V |
| Operating Temperature Range (TA) | -20 | 120 | °C |
| Power Dissipation | 1100 | mW | |
| Storage Temperature Range (Tstg) | -65 | 150 | °C |
| Center Frequency Range | 0.01 Hz | 500 kHz | |
| Bandwidth Adjustable Range | 0% | 14% | |
| Output Current Max. | 15 mA |
Key Features
- 20 to 1 Frequency Range With an External Resistor
- Logic Compatible Output With 100-mA Current Sinking Capability
- Bandwidth Adjustable From 0 to 14%
- 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
- Touch Tone Decoding
- Precision Oscillator
- Frequency Monitoring and Control
- Wide Band FSK Demodulation
- Ultrasonic Controls
- Carrier Current Remote Controls
- Communications Paging Decoders
Q & A
- What is the primary function of the LM567CMX?
The LM567CMX is a general-purpose tone decoder that provides a saturated transistor switch to ground when an input signal is present within the specified passband.
- How is the center frequency of the LM567CMX set?
The center frequency is set by an external timing circuit composed of a capacitor and a resistor, using the formula fo ≃ 1 / (1.1 × R1 × C1).
- What is the adjustable bandwidth range of the LM567CMX?
The bandwidth is adjustable from 0 to 14%.
- What are the typical applications of the LM567CMX?
Typical applications include touch tone decoding, precision oscillators, frequency monitoring and control, wide band FSK demodulation, ultrasonic controls, carrier current remote controls, and communications paging decoders.
- What is the operating temperature range of the LM567CMX?
The operating temperature range is from 0°C to 70°C.
- How does the LM567CMX handle out of band signals and noise?
The LM567CMX features high rejection of out of band signals and noise, ensuring accurate signal detection.
- What type of output does the LM567CMX provide?
The LM567CMX provides a logic compatible output with 100-mA current sinking capability.
- How is the output delay set in the LM567CMX?
The output delay is set by external capacitors.
- What is the maximum output current of the LM567CMX?
The maximum output current is 15 mA.
- Where can I purchase the LM567CMX?
The LM567CMX can be purchased from various electronic component distributors, including Texas Instruments' official website and suppliers like X-ON Electronics.
