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NXP Semiconductors 74HCT7046AD,112
- Part No.:
- 74HCT7046AD,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT7046AD,112.pdf
- Description:
- IC PHASE LOCK LOOP 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
74HCT7046AD,112 from NXP Semiconductors (formerly Philips) is a high-speed CMOS phase-locked-loop IC with integrated lock detector, VCO, and dual phase comparators (XOR and edge-triggered JK). It delivers 17 MHz typical VCO center frequency at VCC = 4.5 V, 50% VCOOUT duty factor (±1%), and operates across 2.0–6.0 V digital supply and 3.0–6.0 V VCO supply. It is used in FM demodulation, tone decoding, and data synchronization circuits.
For engineers reviewing the 74HCT7046AD,112 datasheet, 74HCT7046AD,112 pinout, 74HCT7046AD,112 application, or 74HCT7046AD,112 equivalent, key selection criteria include VCO linearity (0.4% typ.), lock detector functionality (LD pin), dual comparator selection (PC1 vs PC2), and HCT-level input compatibility with TTL systems.
Technical Context
The 74HCT7046AD,112 integrates a linear voltage-controlled oscillator (VCO) with external R1/R2/C1 tuning, two independent phase comparators sharing SIGIN and COMPIN inputs, and a dedicated lock detector (LD) output that asserts HIGH when phase lock is achieved. Its VCO features op-amp buffering for zero offset and DEMOUT pin providing buffered replica of VCOIN voltage.
Phase comparator 1 (PC1) is an XOR type requiring 50% duty-cycle inputs and delivering π-phase sensitivity; PC2 is an edge-triggered up-down detector insensitive to duty cycle, offering full-frequency-range lock with 3-state output and lower ripple. The inhibit (INH) input disables VCO and demodulator to reduce standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCO center frequency | 17 MHz typical at VCC = 4.5 V, R1 = 3 kΩ, C1 = 40 pF - sets PLL operating range for FM/tone applications |
| VCO frequency linearity | 0.4% typical - ensures accurate voltage-to-frequency conversion and stable synthesis |
| Duty factor (VCOOUT) | 50% ±1% - enables precise timing, clock recovery, and symmetric waveform generation |
| Lock detector output (LD) | Active-HIGH logic level - provides unambiguous system-level lock status without external logic |
| Input compatibility | HCT-level (VIH = 2.0 V, VIL = 0.8 V at VCC = 4.5 V) - interfaces directly with TTL and 5 V microcontrollers |
| Supply voltage range | Digital section: 2.0–6.0 V; VCO section: 3.0–6.0 V - supports mixed-supply designs and low-power standby |
| Quiescent supply current | 80 µA max (VCO disabled) - enables battery-operated tone decoders and low-duty-cycle sync circuits |
Pinout & Package
74HCT7046AD,112 is supplied in a 16-pin SO16 (small outline) package per JEDEC MS-012, 150 mil width, with standard 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LD) | Lock detector output | Open-drain or push-pull HIGH when PLL achieves phase lock - used for status monitoring or auto-gain control |
| 2 (PC1OUT) | Phase comparator 1 output | XOR output feeding low-pass filter - requires external RC network to generate VCOIN control voltage |
| 3 (COMPIN) | Comparator input | Reference signal input shared by both PC1 and PC2 - accepts AC- or DC-coupled signals |
| 4 (VCOOUT) | VCO output | 50%-duty square wave output - can drive downstream logic or feed back via divider for frequency synthesis |
| 5 (INH) | Inhibit control | Active-HIGH disable for VCO and demodulator - reduces standby power and enables ON/OFF keying |
| 6/7 (C1A/C1B) | VCO capacitor terminals | Differential connection for external timing capacitor C1 - determines VCO frequency range and stability |
| 8 (GND) | Ground reference | Analog/digital common ground - must be low-impedance to minimize VCO frequency drift |
| 9 (VCOIN) | VCO input control | Analog voltage input controlling VCO frequency - buffered replica available at DEMOUT (pin 10) |
| 10 (DEMOUT) | Demodulator output | Buffered copy of VCOIN voltage - eliminates loading effects on loop filter and simplifies measurement |
| 11/12 (R1/R2) | VCO resistor terminals | External resistors setting VCO bias current and optional frequency offset - parallel R1||R2 > 2.7 kΩ required |
| 13 (PC2OUT) | Phase comparator 2 output | 3-state up/down detector output - enables low-ripple lock and harmonic-free operation |
| 14 (SIGIN) | Signal input | Self-biasing amplifier input for small- or large-swing signals - capacitive coupling recommended for mV-level inputs |
| 15 (CLD) | Lock detector capacitor | Connection for external CLD capacitor (to GND) - sets lock detection time constant per Fig.32 |
| 16 (VCC) | Positive supply | Primary power rail - powers digital logic, comparators, and VCO core (when VCO section enabled) |
Key Features
| Feature | Design Value |
|---|---|
| Dual selectable phase comparators | PC1 (XOR) for high-noise immunity and harmonic locking; PC2 (edge-triggered) for zero-phase-error lock and minimal ripple |
| VCO-inhibit control | INH pin disables VCO and demodulator to reduce standby current - enables low-power wake-on-lock architectures |
| Op-amp buffered VCOIN | Zero-voltage-offset design with DEMOUT pin - preserves loop filter integrity and enables direct VCOIN monitoring |
| Lock detector with external CLD | LD pin asserts HIGH when locked; CLD capacitor value sets response time - eliminates need for external lock-detection circuitry |
| Wide VCO supply range | 3.0–6.0 V independent of digital supply - allows optimized VCO performance while maintaining 5 V logic compatibility |
Applications
| FM Demodulation | Tone Decoding |
|---|---|
Use Scenario: Recovering audio from FM broadcast or wireless telemetry signals using PLL-based quadrature or ratio detector topologies. IC Role / Device Role / Timing Role: 74HCT7046AD,112 serves as the core PLL with VCO tracking carrier frequency deviation and PC2 generating demodulated baseband output. Use Value: 0.4% VCO linearity ensures accurate amplitude-to-frequency mapping; DEMOUT enables direct analog output extraction without additional op-amps. | Use Scenario: Detecting DTMF or sub-audible tones (e.g., 1750 Hz, 2175 Hz) in radio repeaters and security systems. IC Role / Device Role / Timing Role: 74HCT7046AD,112 acts as a narrow-band frequency discriminator where lock condition indicates tone presence. Use Value: LD pin provides clean digital tone-present flag; PC1's harmonic-lock capability allows reliable detection even with distorted input waveforms. |
| Data Synchronization | Motor-Speed Control |
Use Scenario: Recovering clock and data from asynchronous serial streams (e.g., UART over noisy lines, legacy industrial protocols). IC Role / Device Role / Timing Role: 74HCT7046AD,112 functions as a clock and data recovery (CDR) block, locking VCO to incoming bit rate and regenerating clean sampling clock. Use Value: 17 MHz VCO ceiling supports up to ~8.5 Mbps NRZ data; 50% ±1% VCOOUT duty factor ensures balanced setup/hold margins for latch circuits. | Use Scenario: Closed-loop speed regulation of DC motors using tachometer feedback in industrial actuators and HVAC blowers. IC Role / Device Role / Timing Role: 74HCT7046AD,112 compares tachometer pulse frequency against reference and generates error voltage (via PC1/PC2 + LPF) to adjust PWM drive. Use Value: VCO linearity <0.4% ensures linear speed-vs-control-voltage response; INH pin enables motor stop/start via logic-level command. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phase-locked-loop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4046BE | CMOS-compatible, wider VCC range (3–18 V), no HCT-level inputs; lower max VCO frequency (1.2 MHz typ. at 5 V) | Preferred for high-voltage or ultra-low-power designs; unsuitable for TTL-interfaced 5 V systems requiring fast propagation | Select CD4046BE only when supply >6 V or quiescent current <1 µA is critical; verify PC1/PC2 behavior matches legacy schematics. |
| 74HC4046D,653 | Same pinout and architecture but HC-input thresholds (VIH = 3.15 V min); identical VCO specs and lock detector | Compatible in 5 V CMOS systems but not in mixed TTL/CMOS environments where input noise margin is constrained | Choose 74HC4046D,653 if all upstream drivers are HC-logic; otherwise, 74HCT7046AD,112 ensures robust TTL interfacing without level shifters. |
Compared with CD4046BE and 74HC4046D,653, the 74HCT7046AD,112 uniquely combines TTL-compatible inputs, 17 MHz VCO capability, and dual-phase-comparator flexibility - making it optimal for industrial data conditioning and FM demodulator designs requiring both noise resilience and precise frequency control.
Availability
74HCT7046AD,112 is available at Aetrix Electronics and suitable for FM demodulation, tone decoding, data synchronization, motor-speed control, and voltage-to-frequency conversion applications requiring stable component supply and long-term obsolescence management.
Supply support for 74HCT7046AD,112 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HCT7046AD,112 belongs to NXP's legacy 74HCT logic family, designed specifically for robust PLL-based signal conditioning in industrial control, communications, and instrumentation systems where TTL compatibility and analog-digital integration are essential.
FAQ
What is the maximum operating frequency of the VCO in the 74HCT7046AD,112?
The 74HCT7046AD,112 VCO achieves a typical center frequency of 17 MHz at VCC = 4.5 V with R1 = 3 kΩ and C1 = 40 pF. Under optimized conditions (e.g., VCC = 6 V, minimal C1), operation up to 21 MHz is documented. Frequency is externally set by R1, R2, and C1 values - no internal upper limit beyond process constraints.
How does the lock detector (LD) output function in the 74HCT7046AD,112?
The LD pin on the 74HCT7046AD,112 outputs a HIGH logic level when the PLL achieves and maintains phase lock between SIGIN and COMPIN. It requires an external capacitor (CLD) connected between pin 15 (CLD) and GND to set detection time constant, per Figure 32 in the datasheet. LD remains HIGH during lock and transitions LOW upon loss of lock.
Can the 74HCT7046AD,112 operate with separate analog and digital supplies?
Yes - the 74HCT7046AD,112 supports independent supply domains: the digital section (comparators, logic, LD) operates from 2.0–6.0 V, while the VCO section requires 3.0–6.0 V. This allows optimization of VCO stability (e.g., clean 5 V analog rail) while interfacing with 3.3 V or 5 V digital logic, provided GND is common and decoupling is local to each section.
What is the purpose of the DEMOUT pin on the 74HCT7046AD,112?
The DEMOUT pin (pin 10) provides a buffered, unity-gain replica of the VCOIN control voltage. Unlike conventional demodulators, DEMOUT equals VCOIN - eliminating threshold-dependent offsets. It enables non-invasive monitoring of loop filter voltage and prevents loading-induced distortion, especially critical in precision voltage-to-frequency conversion applications using the 74HCT7046AD,112.
Which phase comparator should I use for noise-immune FM demodulation with the 74HCT7046AD,112?
For noise-immune FM demodulation, use phase comparator 1 (PC1, XOR type) on the 74HCT7046AD,112. PC1 offers superior noise rejection and can lock to harmonics of the center frequency, improving capture under weak or distorted signals. Its transfer characteristic (VDEMOUT ∝ φSIGIN − φCOMPIN) provides linear demodulation output when combined with a passive low-pass filter.
74HCT7046AD,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Phase Lock Loop (PLL)
- PLL:
- Yes
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 2:3
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 21MHz
- Divider/Multiplier:
- No/No
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SO
74HCT7046AD,112 FAQ
1.How can I place an order for 74HCT7046AD,112 through Aetrix?
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6.How does Aetrix verify that 74HCT7046AD,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT7046AD,112 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 74HCT7046AD,112 meets industry standards.
7.What is the process for return or replacement of 74HCT7046AD,112?
All 74HCT7046AD,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT7046AD,112, 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 74HCT7046AD,112 part is unused and in its original packaging.
Return procedure for 74HCT7046AD,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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