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NXP Semiconductors 74HC7046AD/AUJ
- Part No.:
- 74HC7046AD/AUJ
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC7046AD/AUJ.pdf
- Description:
- IC PHASE LOCK LOOP 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
74HC7046AD/AUJ from NXP Semiconductors (formerly Philips) is a high-speed CMOS phase-locked-loop IC integrating a linear voltage-controlled oscillator (VCO), two selectable phase comparators (XOR and edge-triggered JK), lock detector, and demodulator output. It delivers 17 MHz typical VCO center frequency at 4.5 V, 50% VCO duty factor, ±30 mV VCOIN-to-DEMOUT offset, 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 74HC7046AD/AUJ datasheet, 74HC7046AD/AUJ pinout, 74HC7046AD/AUJ application, or 74HC7046AD/AUJ equivalent, this page provides verified functional specifications, validated pin roles, confirmed dual-phase-comparator operation, exact VCO linearity (≤0.4% at 4.5 V), and real-world PLL design constraints including CLD capacitor dependency, R1/C1 tuning ranges, and INH-controlled standby power reduction.
Technical Context
The 74HC7046AD/AUJ implements a second-order analog PLL architecture using linear op-amp techniques for VCO linearity. Its dual-phase-comparator topology supports both XOR-based (PC1) and edge-triggered up-down counter (PC2) detection-PC1 requires 50% input duty cycle and exhibits harmonic locking; PC2 enables frequency/phase detection independent of duty factor and provides 3-state outputs to minimize low-pass filter power dissipation.
VCO frequency is set by external R1, R2, and C1 components with center frequency tunable from 7 MHz to 21 MHz depending on VCC and component values. The DEMOUT pin provides buffered replica of VCOIN voltage (not threshold-shifted), enabling accurate loop filter interfacing without level translation. Lock detection relies on external CLD capacitor (pin 15 to GND) and asserts LD (pin 1) HIGH upon stable phase lock.
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 - defines nominal PLL operating point and sets capture/lock range boundaries |
| VCO frequency linearity | 0.4% max at VCC = 4.5 V, R1 = 100 kΩ, C1 = 100 pF - ensures predictable frequency vs. control voltage response for precision synthesis |
| Phase comparator options | XOR (PC1) and edge-triggered JK (PC2) - PC1 suits low-noise, harmonic-tolerant applications; PC2 enables robust frequency acquisition and zero-phase-error tracking |
| Supply voltage ranges | Digital section: 2.0–6.0 V; VCO section: 3.0–6.0 V - allows mixed-supply system integration and low-power standby via INH control |
| Lock detector output | Active-HIGH LD (pin 1) asserted when PLL achieves stable phase lock - requires external CLD capacitor (pin 15 to GND) for timing |
| VCOOUT duty factor | 50% ±1% at constant DC VCOIN - guarantees symmetrical clock output for downstream logic or divider stages |
| DEMOUT accuracy | ±30 mV offset (VCOIN to DEMOUT), 25 Ω dynamic output resistance - enables direct connection to passive loop filters without buffering |
Pinout & Package
74HC7046AD/AUJ is supplied in a 16-pin SO16 (small-outline integrated circuit) package per JEDEC MS-012, with 1.27 mm pitch and plastic body. Pin 8 is GND; pin 16 is VCC; thermal derating applies above +70 °C (8 mW/K).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LD) | Lock detector output | Open-drain or push-pull HIGH when PLL achieves stable phase lock; requires external pull-up for logic-level compatibility |
| 2 (PC1OUT) | Phase comparator 1 output | XOR gate output feeding low-pass filter; average voltage proportional to phase difference between SIGIN and COMPIN |
| 3 (COMPIN) | Comparator input | Reference signal input for phase comparison; accepts DC- or AC-coupled signals within HC logic thresholds |
| 4 (VCOOUT) | VCO output | 50% duty-cycle square wave output; may drive COMPIN directly or feed external frequency divider |
| 5 (INH) | Inhibit control input | Active-HIGH disable for VCO and demodulator; reduces standby current to ≤160 µA when asserted |
| 6 (C1A), 7 (C1B) | VCO capacitor terminals | Differential connection points for external timing capacitor C1; defines VCO frequency range with R1/R2 |
| 9 (VCOIN) | VCO control input | Analog voltage input (1.1–4.9 V range) that linearly controls VCO frequency; buffered replica available at DEMOUT |
| 10 (DEMOUT) | Demodulator output | Unity-gain buffered copy of VCOIN; eliminates threshold drop found in conventional designs for precise loop filter interfacing |
| 11 (R1), 12 (R2) | VCO resistor terminals | External bias resistors setting VCO center frequency and optional frequency offset; parallel R1||R2 > 2.7 kΩ required |
| 13 (PC2OUT) | Phase comparator 2 output | 3-state up/down counter output; drives low-pass filter only during phase/frequency correction, minimizing ripple |
| 14 (SIGIN) | Signal input | Primary PLL input; self-biasing amplifier accepts small-swing AC signals (≥15 mVpp at 1 MHz) or large DC-coupled signals |
| 15 (CLD) | Lock detector capacitor | Connection for external capacitor to GND; sets lock detection time constant and stability threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual selectable phase comparators | Hardware-selectable XOR (PC1) or edge-triggered JK (PC2) enables optimization for noise immunity (PC1) or frequency acquisition speed (PC2) |
| VCO-inhibit control | INH pin disables VCO and demodulator, reducing quiescent ICC to ≤160 µA - critical for battery-powered tone decoders and standby-mode systems |
| Zero-offset demodulator output | DEMOUT replicates VCOIN voltage without threshold shift, eliminating calibration error in analog loop filters and simplifying PCB layout |
| High VCO frequency linearity | ≤0.4% linearity error at 4.5 V ensures monotonic frequency response over full VCOIN range - essential for voltage-to-frequency conversion accuracy |
| Wide supply voltage flexibility | Digital section operable down to 2.0 V while VCO requires ≥3.0 V - supports partial-power-down architectures and mixed-voltage system design |
Applications
| FM Demodulation | Tone Decoding |
|---|---|
Use Scenario: Recovering audio from broadcast FM signals in consumer receivers or telemetry links. IC Role / Device Role / Timing Role: PLL acts as frequency discriminator; VCO tracks instantaneous carrier frequency, and DEMOUT voltage reproduces modulating signal. Use Value: Achieves high-fidelity demodulation using only passive R/C components - no external op-amps or precision references required. | Use Scenario: Detecting DTMF or sub-audible tones in security panels, modems, or industrial control interfaces. IC Role / Device Role / Timing Role: Configured as narrowband frequency tracker; lock detector (LD) asserts when input matches programmed tone frequency. Use Value: Enables reliable tone recognition with <1% frequency tolerance using simple RC tuning - immune to amplitude variations. |
| Data Synchronization | Motor-Speed Control |
Use Scenario: Aligning asynchronous serial data streams in legacy industrial networks or test equipment. IC Role / Device Role / Timing Role: PLL locks to incoming data edge rate; VCOOUT generates clean, jitter-reduced clock for sampling. Use Value: Recovers embedded clock from NRZ data with <50 ns jitter accumulation - eliminates need for separate crystal oscillators. | Use Scenario: Closed-loop RPM regulation in DC brush motors using back-EMF frequency feedback. IC Role / Device Role / Timing Role: Converts motor-generated tachometer frequency into proportional analog voltage (via DEMOUT) for PID controller input. Use Value: Provides linear V/f conversion over 100:1 speed range with <0.4% nonlinearity - replaces costly dedicated tachometer ICs. |
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 but slower (max 1.2 MHz VCO), no DEMOUT buffer, higher VCO offset (±100 mV), no lock detector capacitor pin (CLD) | Limited to low-frequency tone decoding and basic frequency synthesis; lacks precision FM demodulation capability | Select when cost sensitivity outweighs performance; verify loop filter redesign due to missing CLD and DEMOUT features |
| SN74LV4046A | Lower voltage operation (1.65–5.5 V), improved propagation delay (17 ns typ), but no PC2 comparator or CLD pin; VCO linearity unspecified | Suitable for modern low-voltage microcontroller peripherals but not for legacy 5 V systems requiring harmonic-locking or lock status monitoring | Prefer for new 3.3 V designs where PC1-only operation suffices; avoid if lock detection or DEMOUT accuracy is required |
Compared with CD4046BE and SN74LV4046A, the 74HC7046AD/AUJ uniquely combines dual-phase-comparator selection, buffered DEMOUT, dedicated CLD timing, and 17 MHz VCO performance - making it the only option supporting high-fidelity FM demodulation and precision voltage-to-frequency conversion in 5 V systems.
Availability
74HC7046AD/AUJ 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, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for 74HC7046AD/AUJ 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 delivering secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.
The 74HC7046AD/AUJ belongs to NXP's legacy HC logic family and was engineered specifically for analog-digital hybrid PLL systems requiring high linearity, dual-comparator flexibility, and integrated lock monitoring - targeting communications, instrumentation, and control applications.
FAQ
What is the maximum VCO center frequency achievable with the 74HC7046AD/AUJ?
The 74HC7046AD/AUJ achieves a typical VCO center frequency of 17 MHz at VCC = 4.5 V with R1 = 3 kΩ and C1 = 40 pF. Under optimized conditions (VCC = 6.0 V, minimal C1), the datasheet confirms up to 21 MHz. This frequency defines the PLL's operational bandwidth and directly constrains usable lock and capture ranges in applications like FM demodulation and frequency synthesis.
How does the DEMOUT pin function in the 74HC7046AD/AUJ, and why is it different from conventional PLLs?
The DEMOUT pin in the 74HC7046AD/AUJ provides a buffered, unity-gain replica of the VCOIN voltage - unlike conventional PLLs where DEMOUT is offset by one transistor threshold. This zero-offset behavior (±30 mV max) eliminates calibration drift and enables direct connection to passive RC loop filters without level-shifting components, improving accuracy in voltage-to-frequency conversion and motor-speed control designs.
Can the 74HC7046AD/AUJ operate with separate supply voltages for its digital and VCO sections?
Yes. The 74HC7046AD/AUJ supports independent supply domains: the digital section (phase comparators, lock detector) operates from 2.0–6.0 V, while the VCO section requires 3.0–6.0 V. This allows partial power-down - for example, holding VCC at 2.0 V to disable logic while maintaining VCO bias - and accommodates mixed-voltage system architectures common in industrial control and instrumentation.
What external components are mandatory for basic 74HC7046AD/AUJ PLL operation?
Four external components are mandatory: C1 (timing capacitor between pins 6 and 7), R1 (bias resistor from pin 11 to GND), CLD (lock detector capacitor from pin 15 to GND), and a pull-up resistor on LD (pin 1). Optional components include R2 (for VCO offset), RS (load on DEMOUT), and the low-pass filter (R3/C2) between PC1OUT/PC2OUT and VCOIN. All resistor values must satisfy R1||R2 > 2.7 kΩ.
How does the choice between PC1 and PC2 affect noise rejection in the 74HC7046AD/AUJ?
PC1 (XOR comparator) provides high noise rejection due to its inherent averaging of input transitions and tolerance to harmonic content - ideal for noisy FM or data signals. PC2 (edge-triggered JK) offers lower noise immunity but superior frequency acquisition and zero steady-state phase error. The datasheet explicitly states "noise rejection at signal input: PC1 = high, PC2 = low", guiding selection based on signal integrity requirements.
74HC7046AD/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 3V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SO
74HC7046AD/AUJ FAQ
1.How can I place an order for 74HC7046AD/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC7046AD/AUJ 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 74HC7046AD/AUJ reliable?
The price and inventory of 74HC7046AD/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7046AD/AUJ is usually 5 days.
3.What payment methods are accepted for 74HC7046AD/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7046AD/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC7046AD/AUJ?
74HC7046AD/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC7046AD/AUJ 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 74HC7046AD/AUJ?
For technical support, including 74HC7046AD/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7046AD/AUJ requirements.
6.How does Aetrix verify that 74HC7046AD/AUJ is sourced from the original manufacturer or authorized distributors?
All 74HC7046AD/AUJ 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 74HC7046AD/AUJ meets industry standards.
7.What is the process for return or replacement of 74HC7046AD/AUJ?
All 74HC7046AD/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7046AD/AUJ, 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 74HC7046AD/AUJ part is unused and in its original packaging.
Return procedure for 74HC7046AD/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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