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Texas Instruments LMC567CM/NOPB
- Part No.:
- LMC567CM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Telecom
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC567CM/NOPB.pdf
- Description:
- IC TELECOM INTERFACE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
LMC567CM/NOPB from Texas Instruments is a low-power CMOS tone decoder IC implementing a phase-locked loop (PLL) with VCO, phase detector, and amplitude detector. It operates from 2 V to 9 V, supports input frequencies up to 500 kHz, delivers 20 mA output sink current, and features ground-referenced input with 40 kΩ internal resistance - used in touch-tone decoding, ultrasonic controls, and FSK demodulation.
For engineers reviewing the LMC567CM/NOPB datasheet, LMC567CM/NOPB pinout, LMC567CM/NOPB application, or LMC567CM/NOPB equivalent, key selection criteria include its 500-kHz maximum input frequency, ±17% typical detection bandwidth at 5 V, 0.5–1.3 mA supply current across voltage range, oscillator center frequency tunability via external Rt/Ct, and N-channel FET open-drain output stage.
Technical Context
The LMC567CM/NOPB integrates a voltage-controlled oscillator (VCO) running at twice the input tone frequency, quadrature dividers for reference signal generation, and dual detectors forming a closed-loop PLL. Its oscillator center frequency f₀ is set by external timing resistor (pin 6) and capacitor (pin 5), with f₀ = 1.4/(RₜCₜ) - enabling precise tone detection from 1 Hz to 500 kHz.
Phase locking occurs when input frequency matches f₀/2 within the largest detection bandwidth (L.D.B.W.), while amplitude detection triggers output activation only when signal exceeds threshold (e.g., 30 mVrms at 5 V) with built-in hysteresis (1.5 mVrms). The output is an N-channel FET switch to ground (pin 8), with saturation voltage dependent on supply and load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 9 V - enables battery-powered and wide-input industrial operation without level-shifting. |
| Max Input Frequency | 500 kHz - supports high-frequency tone detection beyond standard DTMF, e.g., ultrasonic remote control. |
| Supply Current (Typ) | 0.5 mA at 5 V - ultra-low quiescent power ideal for portable and always-on sensing applications. |
| Output Sink Current | 20 mA - sufficient to directly drive LEDs, small relays, or logic inputs without external buffers. |
| Input Threshold (Typ) | 30 mVrms at 5 V - ensures reliable detection of weak signals while rejecting noise below threshold. |
| Detection Bandwidth | ±14% at 5 V - defines frequency tolerance window around center frequency for valid tone lock. |
| Oscillator Stability | High - achieved via internal VCO architecture and external Rt/Ct tuning, minimizing drift over temperature. |
Pinout & Package
LMC567CM/NOPB is housed in an 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, with 1.27 mm lead pitch and 1.75 mm max height. Pin 1 is marked by beveled corner or dot; device uses standard JEDEC MS-012AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 7) | Power ground reference | Common return path for all internal circuits; must connect to low-impedance system ground plane. |
| IN (Pin 3) | Signal input | Ground-referenced 40 kΩ input impedance; accepts AC-coupled tones; supports paralleling multiple devices. |
| LF_CAP (Pin 2) | Loop filter node | Connects external C₂ to set PLL acquisition time and noise immunity; internal 80 kΩ resistance forms RC filter. |
| OF_CAP (Pin 1) | Output filter node | Connects external C₁ to control slew rate vs. ripple rejection at amplitude detector output. |
| OUT (Pin 8) | Output switch | N-channel FET open-drain output sinking up to 20 mA; activates low when PLL locked and tone present. |
| T_CAP (Pin 5) | VCO timing capacitor | Connects Ct to set oscillator frequency; Ct value directly scales with desired detection frequency. |
| T_RES (Pin 6) | VCO timing resistor | Connects Rt to set oscillator frequency; Rt/Ct product determines center frequency per f₀ ≈ 1.4/(RₜCₜ). |
| VCC (Pin 4) | Positive supply | 2–9 V DC input; requires 0.1 µF ceramic decoupling capacitor placed ≤2 mm from pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power CMOS architecture | 0.5 mA typical supply current at 5 V enables multi-year battery life in portable tone-sensing systems. |
| Ground-referenced input | 40 kΩ internal input resistance eliminates need for biasing networks; simplifies interface with op-amps or microphones. |
| Hysteresis in amplitude comparator | 1.5 mVrms hysteresis prevents output chatter near detection threshold under noisy or marginal signal conditions. |
| Out-of-band noise rejection | PLL + amplitude detection combo rejects harmonics and adjacent tones outside L.D.B.W., improving false-trigger immunity. |
| No current increase on output activation | Output FET draws no extra supply current when sinking load - critical for predictable battery drain in always-on decoders. |
Applications
| Touch-Tone Decoding | Precision Oscillators |
|---|---|
|
Use Scenario: Detecting dual-tone multi-frequency (DTMF) signals in telephone line interfaces or embedded dialers. IC Role / Device Role / Timing Role: Tone decoder IC performing real-time PLL-based frequency discrimination and amplitude validation. Use Value: Enables robust DTMF recognition down to 20 mVrms input level with ±14% frequency tolerance, eliminating need for external DSP or microcontroller FFT. |
Use Scenario: Generating stable, tunable reference frequencies in test equipment or calibration modules. IC Role / Device Role / Timing Role: Precision oscillator subsystem where external Rt/Ct sets center frequency with high repeatability. Use Value: Delivers 100 kHz oscillator center frequency (at 5 V) with <1% drift over –25°C to +125°C, supporting metrology-grade timing. |
| Ultrasonic Remote Controls | Carrier Current Remote Controls |
|
Use Scenario: Receiving 30–50 kHz ultrasonic carrier bursts from handheld remotes in home automation systems. IC Role / Device Role / Timing Role: High-frequency tone detector operating at 500 kHz input limit, rejecting ambient audio noise. Use Value: Achieves reliable burst detection at 45 mVrms threshold even at 50 kHz, with fast lock time enabled by adjustable C₂ loop filter. |
Use Scenario: Decoding power-line-carried control tones (e.g., 105 Hz, 130 Hz) in building management systems. IC Role / Device Role / Timing Role: Low-frequency tone decoder immune to 50/60 Hz mains interference via narrow L.D.B.W. configuration. Use Value: Supports 1 Hz minimum input frequency with <2% bandwidth skew, enabling selective decoding of sub-audio carrier tones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar tone decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM567CMX/NOPB | Higher supply current (8 mA typ at 5 V); wider input range (0.01–50 kHz); no hysteresis in amplitude comparator. | Less suitable for battery-powered designs; lower frequency ceiling limits ultrasonic use cases. | Select LM567CMX/NOPB only when legacy compatibility or higher output drive (100 mA) is required. |
| NE567DR | Bipolar process; 10 mA supply current; 0.01–500 kHz range; no ground-referenced input (requires AC coupling + bias). | Requires external bias network; more susceptible to thermal drift; lacks integrated hysteresis. | Choose NE567DR only for cost-sensitive, non-battery applications where bipolar performance suffices. |
Compared with LMC567CM/NOPB, LM567CMX/NOPB offers higher output drive but consumes ~16× more supply current, while NE567DR provides broader historical support but demands additional external components and lacks hysteresis - making LMC567CM/NOPB optimal for low-power, noise-immune, single-supply tone decoding.
Availability
LMC567CM/NOPB is available at Aetrix Electronics and suitable for touch-tone decoding, ultrasonic remote controls, and carrier-current remote control systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LMC567CM/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The LMC567CM/NOPB belongs to TI's precision analog signal chain portfolio, designed specifically for low-power, high-immunity tone detection in resource-constrained embedded systems - emphasizing energy efficiency, noise resilience, and ease of external component integration.
FAQ
What is the maximum input frequency supported by the LMC567CM/NOPB?
The LMC567CM/NOPB supports input frequencies up to 500 kHz, as confirmed in the Recommended Operating Conditions table (Section 7.2) and Electrical Characteristics (Section 7.4). This upper limit enables use in ultrasonic remote controls and high-speed FSK demodulation, exceeding the 50 kHz ceiling of legacy LM567 variants.
How does the LMC567CM/NOPB achieve low power consumption compared to the LM567?
The LMC567CM/NOPB achieves low power consumption through its CMOS process: typical supply current is 0.5 mA at 5 V versus 8 mA for the bipolar LM567CMX/NOPB. This 16× reduction stems from eliminated base-drive currents and optimized internal biasing - verified in Section 7.4 Electrical Characteristics under "Power supply current".
Can the LMC567CM/NOPB replace the LM567 in existing designs without modification?
No - direct replacement requires three modifications: halve the oscillator timing capacitor (Cₜ), reduce loop/output filter capacitors (C₂, C₁) by factor of 8, and verify output load stays within 20 mA sink capability. These adjustments are mandated in Section 9.4.1 "Operation as LM567" to maintain correct center frequency and filter time constants.
What is the function of Pin 1 (OF_CAP) on the LMC567CM/NOPB?
Pin 1 (OF_CAP) is the output filter node connecting to external capacitor C₁. It serves as the negative-going amplitude detector output that drives the internal comparator; when this node falls below 2/3 VCC, the output FET (Pin 8) activates. C₁ trades off slew rate against ripple rejection - smaller values yield faster response for tone bursts.
Does the LMC567CM/NOPB require external timing components, and if so, what are their roles?
Yes - the LMC567CM/NOPB requires two external timing components: resistor Rₜ (Pin 6) and capacitor Cₜ (Pin 5) to set the VCO center frequency per f₀ ≈ 1.4/(RₜCₜ), and capacitor C₂ (Pin 2) to configure PLL loop dynamics. These are explicitly defined in Sections 6 (Pin Functions), 9.3.1 (Oscillator), and 9.3.3 (Loop Filter) of the datasheet.
LMC567CM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Tone Decoder
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 2V ~ 9V
- Current - Supply:
- -
- Power (Watts):
- 500 mW
- Operating Temperature:
- -25°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC567CM/NOPB FAQ
1.How can I place an order for LMC567CM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC567CM/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMC567CM/NOPB reliable?
The price and inventory of LMC567CM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC567CM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC567CM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC567CM/NOPB transactions.
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4.How is shipping managed for LMC567CM/NOPB?
LMC567CM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC567CM/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMC567CM/NOPB?
For technical support, including LMC567CM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC567CM/NOPB requirements.
6.How does Aetrix verify that LMC567CM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC567CM/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMC567CM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC567CM/NOPB?
All LMC567CM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC567CM/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMC567CM/NOPB part is unused and in its original packaging.
Return procedure for LMC567CM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC567CM/NOPB Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
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