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NXP Semiconductors 74HC7046AN,112
- Part No.:
- 74HC7046AN,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC7046AN,112.pdf
- Description:
- IC PHASE LOCK LOOP 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,152
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Product details
Overview
74HC7046AN,112 from NXP Semiconductors (formerly Philips) is a high-speed CMOS phase-locked-loop IC with integrated lock detector, dual phase comparators (XOR and edge-triggered JK), linear VCO, and demodulator output. It delivers 50% VCO duty factor (±1%), 17 MHz typical center frequency at 4.5 V, 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 motor-speed control circuits.
For engineers reviewing the 74HC7046AN,112 datasheet, 74HC7046AN,112 pinout, 74HC7046AN,112 application, or 74HC7046AN,112 equivalent, key selection criteria include VCO linearity (≤0.4% at 4.5 V), lock detector functionality (pin 1 LD active HIGH), dual comparator architecture, temperature stability (0.15%/K), and compatibility with passive second-order loop filters.
Technical Context
The 74HC7046AN,112 implements a linear voltage-controlled oscillator using op-amp buffering to achieve zero-voltage offset and excellent frequency linearity. Its VCO requires external R1/C1 (and optional R2) for frequency range and offset tuning, with high input impedance enabling flexible low-pass filter design.
It integrates two independent phase comparators: PC1 (XOR type) requiring 50% duty-cycle inputs and offering high noise immunity, and PC2 (edge-triggered JK flip-flop) supporting arbitrary duty cycles, delivering 3-state outputs and equal capture/lock ranges independent of filter characteristics.
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 base PLL operating range |
| VCO frequency linearity | 0.4% max at VCC = 4.5 V - ensures accurate voltage-to-frequency conversion and stable loop response |
| Frequency stability vs temp | 0.15%/K - enables reliable operation across −40 °C to +125 °C ambient without recalibration |
| Duty factor (VCOOUT) | 50% ±1% - provides symmetrical clock output critical for timing-sensitive demodulation and synthesis |
| Lock detector output | Active HIGH on pin 1 (LD) - gives unambiguous system-level lock status without external logic |
| Input sensitivity (AC-coupled) | 15 mVp-p at 1 MHz - supports direct connection to low-amplitude signal sources like audio or sensor outputs |
| Supply voltage range | Digital section: 2.0–6.0 V; VCO section: 3.0–6.0 V - allows mixed-supply designs and low-power standby via INH control |
Pinout & Package
74HC7046AN,112 is supplied in a 16-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LD) | Lock detector output | Open-drain or push-pull HIGH when PLL achieves phase/frequency lock - used for status monitoring or automatic gain control enable |
| 2 (PC1OUT) | Phase comparator 1 output | XOR-based error signal output feeding low-pass filter - requires external RC network to generate VCO control voltage |
| 3 (COMPIN) | Comparator input | Feedback path from VCOOUT or frequency divider - accepts DC-coupled or AC-coupled signals up to 17 MHz |
| 4 (VCOOUT) | VCO output | 50%-duty square wave output - directly drives COMPIN or connects to external dividers for frequency synthesis |
| 5 (INH) | VCO inhibit input | Active HIGH disables VCO and DEMOUT to reduce standby current - enables ON/OFF keying and power gating |
| 6,7 (C1A, C1B) | VCO capacitor terminals | Connect external timing capacitor C1 (≥40 pF) - determines VCO frequency range and linearity performance |
| 8 (GND) | Ground reference | Common return for digital, VCO, and demodulator sections - must be low-impedance for stable lock detection |
| 9 (VCOIN) | VCO input control | Analog voltage input (1.1–4.9 V) controlling VCO frequency - buffered to prevent loading of external filter |
| 10 (DEMOUT) | Demodulator output | Buffered replica of VCOIN voltage - eliminates threshold drop vs conventional demodulators, simplifying filter design |
| 11,12 (R1, R2) | VCO resistor terminals | Connect external timing resistors - R1 sets center frequency; R2 adds programmable frequency offset |
| 13 (PC2OUT) | Phase comparator 2 output | 3-state up/down pulse output - enables zero-phase-error locking and reduces ripple in VCO control voltage |
| 14 (SIGIN) | Signal input | Self-biasing amplifier input accepting DC- or AC-coupled signals - handles small-swing inputs via series capacitor or large swings directly |
| 15 (CLD) | Lock detector capacitor | Connects external CLD capacitor to GND - sets lock detector time constant and noise immunity per Fig.32 |
| 16 (VCC) | Positive supply | Primary power rail for digital logic and VCO bias - decoupling required near pin for stable lock acquisition |
Key Features
| Feature | Design Value |
|---|---|
| Dual selectable phase comparators | PC1 (XOR) for high-noise environments; PC2 (edge-triggered JK) for zero-phase-error locking and arbitrary input duty cycles |
| VCO-inhibit control | Active HIGH INH pin reduces standby power by disabling VCO and DEMOUT - essential for battery-powered tone decoders |
| Linear op-amp VCO architecture | Zero voltage offset and <0.4% linearity enable precision voltage-to-frequency conversion and stable FM demodulation |
| Demodulator output (DEMOUT) | Exact replica of VCOIN voltage - eliminates design margin loss from threshold drops and simplifies low-pass filter component selection |
| Lock detector with external CLD | Configurable lock detection window via CLD capacitor - balances acquisition speed and false-lock immunity in motor control loops |
Applications
| FM Demodulation | Tone Decoding |
|---|---|
Use Scenario: Recovering audio from FM broadcast or wireless telemetry signals in consumer and industrial receivers. IC Role / Device Role / Timing Role: PLL acts as synchronous demodulator where VCO tracks carrier frequency and DEMOUT reproduces modulating signal. Use Value: High linearity (0.4%) and low offset (<±20 mV) ensure minimal distortion in recovered audio; PC2 mode suppresses harmonic lock artifacts. | Use Scenario: Detecting specific DTMF or sub-audible tones in security systems, remote controls, and telephony interfaces. IC Role / Device Role / Timing Role: Configured as narrowband frequency discriminator with lock detector enabling tone-present logic output. Use Value: 15 mVp-p AC sensitivity allows direct coupling to microphone preamps; INH pin enables low-power wake-on-tone operation. |
| Motor-Speed Control | Data Synchronization |
Use Scenario: Closed-loop speed regulation of DC or stepper motors using back-EMF or encoder feedback. IC Role / Device Role / Timing Role: PLL locks to tachometer pulse train; VCOOUT drives PWM generator or phase-shift circuitry. Use Value: 0.15%/K temperature stability prevents speed drift over operating range; dual comparators support both clean encoder signals (PC2) and noisy back-EMF (PC1). | Use Scenario: Aligning asynchronous serial data streams in legacy communication protocols or test equipment. IC Role / Device Role / Timing Role: Acts as clock recovery unit, generating bit-clock synchronized to incoming NRZ data transitions. Use Value: PC2's equal capture/lock range ensures rapid reacquisition after burst errors; 50% VCOOUT duty cycle supports balanced sampling windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phase-locked-loop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC4046M96 | Single-phase-comparator (XOR only); no PC2; lower max center frequency (14 MHz); identical DIP-16 package | Lacks edge-triggered comparator - unsuitable for arbitrary-duty-cycle inputs or zero-phase-error locking | Select when cost sensitivity outweighs need for PC2 features and higher frequency range |
| SN74LV4046A | Lower voltage operation (1.65–5.5 V); LV logic thresholds; reduced VCO linearity (1.0%); same dual-comparator architecture | Better suited for mixed-voltage 3.3 V systems but sacrifices FM demodulation fidelity due to higher linearity error | Select for 3.3 V-only designs where power efficiency and logic compatibility supersede analog precision |
Compared with CD74HC4046M96 and SN74LV4046A, the 74HC7046AN,112 offers superior VCO linearity (0.4% vs 1.0%), higher center frequency (17 MHz vs 14 MHz), and full dual-comparator flexibility - making it optimal for precision FM demodulation, tone decoding, and motor control where analog accuracy and wide dynamic range are critical.
Availability
74HC7046AN,112 is available at Aetrix Electronics and suitable for FM demodulation, tone decoding, and motor-speed control applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for 74HC7046AN,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 markets.
The 74HC7046AN,112 belongs to NXP's legacy HC logic family and was designed specifically for analog-intensive PLL applications including FM demodulation, frequency synthesis, and motor control - emphasizing linearity, lock reliability, and dual-comparator flexibility.
FAQ
What is the maximum VCO center frequency achievable with the 74HC7046AN,112?
The 74HC7046AN,112 achieves a typical VCO center frequency of 17 MHz at VCC = 4.5 V with R1 = 3 kΩ and C1 = 40 pF. This value is confirmed in the Quick Reference Data table (page 4) and supported by Fig.17 and Fig.30 in the datasheet. Higher frequencies require smaller C1 values (≥40 pF minimum) and lower R1, but linearity and stability degrade beyond this specification limit.
How does the 74HC7046AN,112 differ from the standard 74HC4046 in phase comparator functionality?
The 74HC7046AN,112 includes two distinct phase comparators: PC1 (XOR) and PC2 (edge-triggered JK flip-flop), whereas the 74HC4046 offers only PC1. PC2 enables zero-phase-error locking, supports arbitrary input duty cycles, and provides 3-state outputs - critical for low-ripple VCO control and robust data synchronization in the 74HC7046AN,112.
What external components are mandatory for basic 74HC7046AN,112 PLL operation?
Four external components are mandatory: capacitor C1 (≥40 pF) between pins 6 and 7; resistor R1 (3–300 kΩ) from pin 11 to GND; lock detector capacitor CLD from pin 15 to GND; and a low-pass filter (R3/C2) between PC1OUT (pin 2) or PC2OUT (pin 13) and VCOIN (pin 9). These are specified in the General Description (page 2) and Application Information (page 27).
Can the 74HC7046AN,112 operate with a single 3.3 V supply?
Yes - the digital section of the 74HC7046AN,112 operates down to 2.0 V, and the VCO section functions from 3.0 V. At 3.3 V, center frequency drops to ~11 MHz (per AC Characteristics, page 14), VCO linearity remains ≤0.4%, and all logic thresholds remain valid. However, full 17 MHz performance requires ≥4.5 V per the datasheet's typical conditions.
What is the purpose of the DEMOUT pin (pin 10) on the 74HC7046AN,112?
The DEMOUT pin on the 74HC7046AN,112 provides a buffered, unity-gain replica of the VCOIN voltage - eliminating the ~0.7 V threshold drop found in conventional demodulators. This allows direct use of DEMOUT as the filtered phase error signal, simplifying low-pass filter design and preserving DC accuracy for applications like voltage-to-frequency conversion and precision FM demodulation.
74HC7046AN,112 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
74HC7046AN,112 FAQ
1.How can I place an order for 74HC7046AN,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC7046AN,112 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 74HC7046AN,112 reliable?
The price and inventory of 74HC7046AN,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7046AN,112 is usually 5 days.
3.What payment methods are accepted for 74HC7046AN,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7046AN,112 transactions.
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4.How is shipping managed for 74HC7046AN,112?
74HC7046AN,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC7046AN,112 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 74HC7046AN,112?
For technical support, including 74HC7046AN,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7046AN,112 requirements.
6.How does Aetrix verify that 74HC7046AN,112 is sourced from the original manufacturer or authorized distributors?
All 74HC7046AN,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 74HC7046AN,112 meets industry standards.
7.What is the process for return or replacement of 74HC7046AN,112?
All 74HC7046AN,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7046AN,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 74HC7046AN,112 part is unused and in its original packaging.
Return procedure for 74HC7046AN,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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