LM567CM - 8-SOIC Tone Decoder | Texas Instruments
MPN: LM567CM ✓ NakahandaLM567CM Ulas
A tone decoder is a signal-processing IC that converts the presence or absence of a particular frequency into a digital or switch-level output. The LM567 belongs to the broader tone-decoder, frequency-detection, interface, and signal-processing categories. Its oscillator sets the center frequency of the decoder, while the input detector evaluates the relationship between the incoming signal and that oscillator frequency. This makes the device useful when a system must make a hardware decision based on an analog tone rather than relying entirely on software frequency analysis.
The LM567CM is packaged in an 8-pin narrow SOIC and is specified for a single decoder circuit. The verified electrical data indicates a 4.75 V minimum supply voltage and 9 V maximum supply voltage, with a supply current of 12 mA. Its 0°C to 70°C operating range makes it a commercial-temperature device rather than an explicitly automotive-grade or extended-temperature part. The listed 1.10 W power value should be treated as the maximum published power rating, not as typical dissipation in every operating condition.
The LM567 family provides a saturated transistor output to ground when the input tone is present within the passband. In a typical circuit, the device is combined with resistors and capacitors that establish oscillator frequency, bandwidth, and filtering behavior. Component tolerances and temperature drift determine the practical center-frequency accuracy and detection bandwidth. Designers should also account for input signal level, supply decoupling, output pull-up requirements, and the possibility that the transistor output conducts whenever the detector is asserted.
Typical applications include telephone line tone decoding, communications equipment, audio signaling, remote-control receivers, frequency-selective alarm systems, industrial control interfaces, and embedded tone recognition. In each case, the LM567CM provides a hardware output that can be read by a microcontroller or used to control a relay, indicator, or other system actuator. The circuit is especially useful when a fast, simple tone decision is required without allocating processor resources to a complete spectrum-analysis algorithm.
For a reliable implementation, place the LM567CM close to its timing and filter components, use a stable supply with local bypass capacitance, and verify the selected oscillator components against the required tone frequency. The output transistor is brought to ground when a tone is detected, so the application must provide the correct pull-up arrangement and must not assume an actively driven high output. The manufacturer datasheet should be used for the exact pinout, timing equations, output ratings, and recommended application circuit.
This product record combines the verified LM567CM specifications with a same-package alternative review, practical tone-decoder design guidance, and a parameter-oriented comparison of available replacements. It is intended to help engineers narrow the selection quickly while preserving the need to validate pinout, electrical limits, timing, and sourcing details against the manufacturer documentation before production substitution.
Mga alternatibo na pwedeng ilagay na LM567CM — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
LM567CM/NOPB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LMC567CM/NOPB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM567CMX/NOPB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM567CM Mga Spesipikasyon
| Product Type | General-purpose tone decoder |
| Number of Circuits | 1 circuit |
| Supply Voltage Range | 4.75 V to 9 V |
| Kuru-kuryente ng Pagbibigay | 12 mA |
| Hanay ng Temperature na Operasyon | 0°C to 70°C |
| Maximum Power | 1.10 W |
| Packhaging | 8-pin SOIC narrow |
| Package Type | SOIC |
| Bilang ng Pins | 8 pins |
| Type ng Output | Saturated transistor switch to ground |
| Oscillator | Voltage-controlled oscillator |
| Detection Architecture | I and Q detector |
| Lead-Free Status | Contains lead |
| Product Category | Telecom IC tone decoder |
| Operating Temperature Classification | Commercial temperature |
| Uri ng Pagpapasok | Surface mount |
| Datasheet Document Type | Manufacturer datasheet |
Gabay sa Pin Configuration ng LM567CM soic
Pin configuration para sa LM567CM (soic package). Ang pagnunumero ng pin, mga function, at connection diagram ay tinukoy sa datasheet ng manufacturer. Sumangguni dito para sa eksaktong footprint at mga alituntunin sa soldering.
Wala ng detalyadong pinout data na magagamit para sa LM567CM.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
LM567CM ay nararapat para sa 6 aplikasyons: Telephone Tone Decoding, Communications Equipment Tone Signaling, Remote-Control Receiver, Industrial Frequency-Selective Alarm, Audio Frequency-Selective Interface, Embedded Tone Recognition Control.
Telephone Tone Decoding
The LM567CM fits telephone tone-decoding circuits because it detects a selected frequency through an internal voltage-controlled oscillator and I/Q detector, then activates a saturated transistor output to ground. Its verified 4.75 V to 9 V supply range suits low-voltage telecom circuitry, while the 8-pin SOIC package supports compact surface-mount layouts. The external oscillator and filter components determine the exact detection frequency and bandwidth. During design, account for component tolerance, input level, supply bypass capacitance, and the output transistor's need for the correct pull-up arrangement.
Inirekomenda
Communications Equipment Tone Signaling
The LM567CM is appropriate for communications equipment that uses an analog tone as a presence, mode, or channel-selection signal. Its single-circuit tone-detector architecture produces a hardware-level indication without requiring continuous software spectrum analysis. The verified 12 mA supply current and 4.75 V to 9 V operating range provide a defined operating envelope for embedded telecom systems. A production implementation should stabilize the oscillator timing network, prevent false detections through appropriate bandwidth selection, and verify the output behavior against the system logic family.
Inirekomenda
Remote-Control Receiver
The LM567CM can decode a command tone in audio-frequency remote-control systems, allowing a receiver to distinguish one transmitted command from another using hardware detection. Its verified 8-SOIC package and single tone-decoder circuit support compact receiver boards, and its commercial 0°C to 70°C range fits many indoor environments. Designers should calculate the oscillator components for the intended command frequency, constrain bandwidth to reject adjacent tones, and confirm the input coupling and filtering network to avoid false activations.
Inirekomenda
Industrial Frequency-Selective Alarm
The LM567CM is useful in industrial alarm systems that require a dedicated frequency to activate a relay, indicator, or controller input. Its saturated transistor output to ground provides a simple hardware detection event, and the verified 4.75 V to 9 V supply range supports integration with conventional low-voltage control circuits. Reliable deployment requires EMI-resistant input filtering, stable timing components, and a defined response strategy for absent or out-of-band tones. The operating temperature range is 0°C to 70°C, so temperature extremes require a separately qualified device.
Inirekomenda
Audio Frequency-Selective Interface
The LM567CM can act as a frequency-selective interface in audio equipment that needs to recognize a particular control or synchronization tone. The detector uses a voltage-controlled oscillator to define the center frequency, so external timing components and their tolerances determine the repeatability of recognition. The LM567CM's 8-pin SOIC footprint makes it convenient for mixed analog and digital boards, while its 12 mA supply current provides a defined basis for power-budget calculations. Verify input level, distortion, bandwidth, and output pull-up requirements in the manufacturer application circuit.
Inirekomenda
Embedded Tone Recognition Control
The LM567CM offers a hardware-assisted alternative to software tone recognition in embedded control systems, allowing a microcontroller to act immediately when the correct frequency is detected. The verified single-circuit implementation and 8-SOIC package simplify board integration, while the transistor output provides a straightforward event signal. A robust design should use the output state as an interrupt or polling input, define debounce behavior, and isolate the detector from motor or relay noise. The 0°C to 70°C specification must be checked against the enclosure's environmental limits.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for LM567CM — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | LM567CM/NOPB | LMC567CM/NOPB | LM567CMX/NOPB |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | General-purpose tone decoder | General-purpose tone decoder | Tone decoder | Tone decoder |
| Lead-Free Status | Contains lead | NOPB ordering option | NOPB ordering option | NOPB ordering option |
Pangunahing mga Pagkakaiba
- Directly documented same-package ordering option (kumpara saLM567CM/NOPB)
- Functionally compatible pin-for-pin family option (kumpara saLMC567CM/NOPB)
- Commercial-temperature tone decoding (kumpara saLM567CMX/NOPB)
Talaan ng Disenyo
Do not substitute an LM or LMC tone decoder solely because the function is similar. The verified cross-reference supports LMC567CM/NOPB as pin-for-pin compatible in most applications, but oscillator coefficients, timing tolerances, output behavior, and electrical limits must be checked against the original LM567CM datasheet. Existing resistor and capacitor values may produce different center frequencies or bandwidths across implementations. Prototype the replacement over the full intended tone and noise range before releasing it for production.
Place the LM567CM oscillator and filter components close to their associated IC pins to minimize board-induced error and coupling. Route the tone input away from switching nodes and relay drivers, and keep the supply-return path short. Add local supply bypass capacitance according to the manufacturer application circuit, and maintain a compact ground reference for the detector. Because the output transistor switches to ground, its pull-up and signal traces should be positioned to avoid unintended transient coupling into the sensitive input path.
The detection threshold depends on input amplitude, distortion, noise, bandwidth, and oscillator stability rather than frequency alone. Verify that the intended tone activates the output across the full supply-voltage range, but reject adjacent or unintended tones through appropriate bandwidth and filtering. Use stable timing components if repeatable center frequency is important, and test with worst-case input levels. A hardware tone decision should also include a defined response to false or intermittent detections.
Impormasyon ng Pagsunod sa Kautusan
The verified specification excerpt states that LM567CM contains lead. RoHS, REACH, halogen-free, and conflict-minerals status were not established by the supplied excerpts and are therefore recorded as unknown.
