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NXP Semiconductors 74HC4046AN,652
- Part No.:
- 74HC4046AN,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC4046AN,652.pdf
- Description:
- IC PHASE LOCK LOOP 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,364
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Product details
Overview
74HC4046AN,652 from Nexperia is a high-speed CMOS phase-locked loop (PLL) IC with integrated linear voltage-controlled oscillator (VCO) and three selectable phase comparators (EXOR, edge-triggered J-K, and edge-triggered RS). It operates from 3.0 V to 6.0 V (VCO section), delivers up to 17 MHz center frequency at VCC = 4.5 V, features VCO-inhibit control for standby power reduction, and is used in FM demodulation, frequency synthesis, and motor-speed control circuits.
For engineers reviewing the 74HC4046AN,652 datasheet, 74HC4046AN,652 pinout, 74HC4046AN,652 application, or 74HC4046AN,652 equivalent, this page provides verified functional architecture, exact pin roles, real-world PLL design constraints (e.g., R1/C1 dependency for f0, DEM_OUT voltage tracking), and validated alternative options for lock-range, linearity, and supply-voltage compatibility.
Technical Context
The 74HC4046AN,652 implements a second-order PLL using external passive low-pass filtering between phase comparator outputs (PC1/PC2/PC3) and the VCO input (pin 9). Its VCO employs linear op-amp techniques to achieve excellent frequency linearity and low drift - <0.4% relative variation over R1/C1 range and ±0.15%/K temperature coefficient at VCC = 4.5 V.
All three phase comparators share a common signal input amplifier (SIG_IN, pin 14) and comparator input (COMP_IN, pin 3), supporting both DC- and AC-coupled small-signal inputs via self-bias circuitry. PC2 functions as an up-down frequency/phase detector with 3-state output and lock-indication via PCP_OUT (pin 1); PC1 requires 50% duty-cycle inputs and yields sinusoidal demodulator response; PC3 provides wider phase detection range (0–360°) but higher ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCO) | 3.0 V to 6.0 V - sets VCO tuning range and max center frequency; below 3.0 V disables VCO operation |
| Center Frequency (f₀) | 17 MHz (typ.) at VCC = 4.5 V with R1 = 3 kΩ, C1 = 40 pF - defines PLL lock bandwidth baseline |
| VCO Linearity Error | <0.4% (R1 = 100 kΩ, C1 = 100 pF) - ensures predictable frequency vs. control voltage mapping for precision synthesis |
| Phase Comparator Options | PC1 (XOR), PC2 (edge-triggered J-K), PC3 (edge-triggered RS) - selectable via external routing; PC2 enables frequency acquisition without duty-cycle constraint |
| Demodulator Output (DEM_OUT) | Tracks VCO_IN voltage with ±20 mV offset (VCC = 4.5 V) - eliminates threshold-drop error vs. conventional designs, simplifying filter design |
| Input Leakage Current | <±0.1 μA on INH/VCO_IN - minimizes VCO tuning voltage error from parasitic current paths |
| ESD Rating | HBM >2000 V, CDM >1000 V - supports robust handling in industrial assembly environments |
Pinout & Package
74HC4046AN,652 is supplied in a 16-lead DIP package (plastic dual in-line package), compatible with through-hole PCB assembly and socketing. Pin numbering follows standard DIP layout with notch orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PCP_OUT) | Phase comparator pulse output | Active-HIGH lock indicator when using PC2; remains HIGH only when SIG_IN and COMP_IN frequencies/phase are matched |
| 2 (PC1_OUT) | Phase comparator 1 output | XOR output; average voltage proportional to phase difference - requires external low-pass filter to drive VCO_IN |
| 3 (COMP_IN) | Comparator input | Reference input for all phase comparators; accepts DC- or AC-coupled signals with self-biasing |
| 4 (VCO_OUT) | VCO output | 50% duty-cycle square wave (±1% deviation); directly connectable to COMP_IN or external frequency divider |
| 5 (INH) | Inhibit input | Active-HIGH disables VCO and demodulator - reduces standby current to <160 μA at VCC = 6 V |
| 6 (C1A) / 7 (C1B) | VCO capacitor terminals | Differential connection points for timing capacitor C1 - value sets VCO frequency range (40 pF to no limit) |
| 8 (GND) | Ground reference | 0 V return for all sections; must be low-impedance to minimize VCO noise coupling |
| 9 (VCO_IN) | VCO control input | Analog voltage input (1.1 V to 4.9 V at VCC = 4.5 V) that linearly sets VCO frequency; buffered by internal op-amp |
| 10 (DEM_OUT) | Demodulator output | Buffered replica of VCO_IN voltage - use with series resistor (50–300 kΩ) to avoid loading low-pass filter |
| 11 (R1) / 12 (R2) | VCO resistor terminals | R1 sets base frequency; R2 adds offset - parallel R1||R2 must exceed 2.7 kΩ; >10 kΩ recommended for stability |
| 13 (PC2_OUT) | Phase comparator 2 output | 3-state up/down current source - drives low-pass filter; n-type/p-type drivers active based on phase/frequency lead/lag |
| 14 (SIG_IN) | Signal input | Primary input for feedback or reference signal; self-biased for small AC signals; full logic-level tolerant for digital inputs |
| 15 (PC3_OUT) | Phase comparator 3 output | RS flip-flop output - provides 0°–360° phase detection with greater voltage swing than PC2 but higher ripple |
| 16 (VCC) | Supply voltage | 2.0–6.0 V for digital logic; 3.0–6.0 V required for VCO operation - decoupling capacitor mandatory at pin |
Key Features
| Feature | Design Value |
|---|---|
| VCO-Inhibit control (INH) | Reduces standby current to ≤160 μA while preserving fast wake-up - critical for battery-powered tone decoders and motor controllers |
| Three-phase comparator selection | Enables optimization per application: PC1 for narrow-band FM demodulation, PC2 for wide-capture frequency synthesis, PC3 for harmonic-tolerant data synchronization |
| DEM_OUT voltage tracking | Delivers VCO_IN replica with ±20 mV offset (VCC = 4.5 V), eliminating diode-drop errors in traditional demodulators and simplifying filter component selection |
| Linear VCO architecture | Achieves <0.4% frequency nonlinearity and ±0.15%/K tempco - enables stable voltage-to-frequency conversion in precision sensor interfaces |
| Self-biasing input amplifier | Accepts AC-coupled signals as low as 15 mVp-p (1 MHz, VCC = 4.5 V) without external biasing - reduces BOM count in tone-decoding receivers |
| High-input-impedance VCO | Input resistance ≥150 kΩ (VCC = 6 V) - prevents loading of external low-pass filters and maintains loop stability across R/C combinations |
Applications
| FM Demodulation | Frequency Synthesis |
|---|---|
|
Use Scenario: Recovering audio from broadcast FM signals in consumer radio receivers. IC Role / Device Role / Timing Role: PLL-based ratio detector where VCO_OUT locks to carrier, and DEM_OUT extracts baseband audio. Use Value: Eliminates discrete transistor discriminators; achieves 30 dB SNR improvement over RC-based detectors due to linear VCO and low-offset DEM_OUT. |
Use Scenario: Generating precise clock multiples (e.g., 4×, 8×) from a crystal reference in microcontroller peripherals. IC Role / Device Role / Timing Role: Frequency multiplier using PC2 for wide capture range and VCO_OUT fed back through ÷N counter to COMP_IN. Use Value: Enables jitter-free multiplication up to 17 MHz without external PLL ICs; R1/C1 tuning allows fine-grained step resolution. |
| Tone Decoding | Motor-Speed Control |
|
Use Scenario: Detecting DTMF tones in telephony interface modules. IC Role / Device Role / Timing Role: Dual-PLL tone detector - one 74HC4046AN,652 per frequency band (697 Hz / 770 Hz), comparing SIG_IN against VCO_OUT. Use Value: Self-biasing input accepts transformer-coupled audio directly; PC1's XOR response gives sharp zero-crossing detection for reliable tone recognition. |
Use Scenario: Closed-loop speed regulation of DC brush motors using back-EMF feedback. IC Role / Device Role / Timing Role: VCO converts tachometer pulse frequency to analog control voltage; PC2 maintains lock under variable load-induced speed fluctuations. Use Value: VCO linearity <0.4% ensures <±1 RPM speed accuracy over 100:1 range; INH enables sleep-mode during idle periods. |
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 | Older CMOS family; VCC = 3–18 V; center frequency ≤1.2 MHz at 5 V; no DEM_OUT voltage tracking; higher VCO tempco (±0.5%/K) | Lower-frequency legacy systems (e.g., analog synthesizers, simple tone generators) where wide supply range outweighs speed/linearity needs | Select CD4046BE only if 18 V operation or backward compatibility with 4000-series designs is required; not suitable for >5 MHz synthesis. |
| LM565 | Bipolar technology; VCC = ±6 V to ±12 V; analog-only VCO; no digital phase comparators; requires external op-amps for filtering | High-precision analog PLLs (e.g., instrumentation lock-in amplifiers) needing sub-Hz resolution and ultra-low phase noise | Choose LM565 when analog VCO tuning linearity <0.1% and thermal drift <50 ppm/°C are mandatory; incompatible with digital logic interfacing. |
Compared with CD4046BE and LM565, the 74HC4046AN,652 delivers 14× higher center frequency, integrated digital comparators eliminating external logic, and DEM_OUT voltage tracking that removes filter design uncertainty - making it optimal for modern embedded frequency control where size, power, and design cycle time matter.
Availability
74HC4046AN,652 is available at Aetrix Electronics and suitable for FM demodulation, frequency synthesis, tone decoding, motor-speed control, and voltage-to-frequency conversion requiring stable component supply across industrial, automotive, and consumer electronics programs.
Supply support for 74HC4046AN,652 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies - delivering high-performance, reliable, and scalable logic, analog, and MOSFET solutions for automotive, industrial, and mobile markets.
The 74HC4046AN,652 belongs to Nexperia's HC logic family, engineered for high-speed, low-power PLL applications where precise frequency control, wide supply tolerance, and robust ESD protection are critical in cost-sensitive embedded systems.
FAQ
What is the maximum operating frequency of the 74HC4046AN,652 VCO section?
The 74HC4046AN,652 VCO achieves a typical center frequency (f₀) of 17 MHz at VCC = 4.5 V with R1 = 3 kΩ and C1 = 40 pF. Under optimized conditions (VCC = 6.0 V, minimal R1/C1), f₀ reaches 21 MHz. Operation above this requires verifying stability margins, as propagation delays and VCO linearity degrade near device limits. The 74HC4046AN,652 datasheet specifies no guaranteed operation beyond 21 MHz.
Can the 74HC4046AN,652 be used with a single-supply 3.3 V system?
Yes, the 74HC4046AN,652 supports VCC = 3.0 V minimum for the VCO section and 2.0 V for digital logic. At 3.3 V, the center frequency drops to ~10 MHz (R1 = 3 kΩ, C1 = 40 pF), VCO linearity remains <0.4%, and input thresholds adjust proportionally (VIH ≈ 2.3 V, VIL ≈ 1.0 V). Ensure DEM_OUT series resistor is ≥50 kΩ to maintain accuracy, and verify PC2 lock acquisition with your specific low-pass filter.
How does the DEM_OUT pin function in the 74HC4046AN,652, and why is it different from conventional PLLs?
The DEM_OUT pin on the 74HC4046AN,652 provides a buffered, unity-gain replica of the VCO_IN voltage - unlike conventional PLLs where DEM_OUT lags VCO_IN by one diode drop. This eliminates tuning voltage error, simplifies low-pass filter design, and improves loop stability. For accurate operation, connect a 50–300 kΩ series resistor from DEM_OUT to GND; leaving it open risks leakage-induced offset in high-impedance filter networks.
Which phase comparator should I select for frequency synthesis with wide capture range in the 74HC4046AN,652?
Use Phase Comparator 2 (PC2) for wide-capture frequency synthesis. PC2 is an edge-triggered up-down detector that acquires lock regardless of input duty cycle and provides a 3-state output that minimizes filter power dissipation. Its capture and lock ranges are equal and independent of low-pass filter characteristics - unlike PC1, which requires 50% duty-cycle inputs and has capture range limited by filter bandwidth. PC2's lock indication via PCP_OUT further simplifies system monitoring.
What are the key layout considerations for stable 74HC4046AN,652 PLL operation?
Stable 74HC4046AN,652 operation requires: (1) a 100 nF ceramic decoupling capacitor placed within 5 mm of VCC (pin 16) and GND (pin 8); (2) short, direct traces for C1 (pins 6/7) and R1/R2 (pins 11/12) to minimize stray capacitance; (3) grounding the DEM_OUT series resistor (50–300 kΩ) to the same analog ground node as VCO_IN (pin 9); and (4) shielding SIG_IN (pin 14) and COMP_IN (pin 3) from digital noise sources. Avoid routing VCO_OUT (pin 4) near sensitive analog nodes.
74HC4046AN,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- 3V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-DIP
74HC4046AN,652 FAQ
1.How can I place an order for 74HC4046AN,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC4046AN,652 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 74HC4046AN,652 reliable?
The price and inventory of 74HC4046AN,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC4046AN,652 is usually 5 days.
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74HC4046AN,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC4046AN,652 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 74HC4046AN,652?
For technical support, including 74HC4046AN,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC4046AN,652 requirements.
6.How does Aetrix verify that 74HC4046AN,652 is sourced from the original manufacturer or authorized distributors?
All 74HC4046AN,652 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 74HC4046AN,652 meets industry standards.
7.What is the process for return or replacement of 74HC4046AN,652?
All 74HC4046AN,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC4046AN,652, 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 74HC4046AN,652 part is unused and in its original packaging.
Return procedure for 74HC4046AN,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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