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NXP Semiconductors 74HC7046ADB,112
- Part No.:
- 74HC7046ADB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC7046ADB,112.pdf
- Description:
- IC PHASE LOCK LOOP 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
74HC7046ADB,112 from NXP Semiconductors is a high-speed Si-gate CMOS phase-locked-loop (PLL) 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 ±30 mV demodulator offset voltage. It is used in FM demodulation circuits where precise frequency tracking and low standby power via INH control are required.
For engineers reviewing the 74HC7046ADB,112 datasheet, 74HC7046ADB,112 pinout, 74HC7046ADB,112 application, or 74HC7046ADB,112 equivalent, key selection criteria include VCO linearity (≤0.4% at 4.5 V), dual comparator flexibility (PC1 for noise-immune locking, PC2 for frequency/phase detection), lock detector output (LD, active HIGH), and compatibility with passive second-order loop filters using external R/C networks.
Technical Context
The 74HC7046ADB,112 implements a linear voltage-controlled oscillator (VCO) with op-amp buffering to achieve zero-voltage offset and excellent frequency linearity. Its VCO section operates from 3.0–6.0 V, while the digital logic section functions from 2.0–6.0 V - enabling mixed-supply designs. The VCO requires external R1/R2 and C1 components to set center frequency (fo), lock range (2fL), and optional frequency offset.
Two independent phase comparators share signal input (SIGIN) and comparator input (COMPIN): PC1 is an XOR gate requiring 50% duty-cycle inputs and offering high noise immunity; PC2 is an edge-triggered up/down counter with 3-state output, supporting arbitrary duty cycles and delivering ripple-free DC error voltage when locked. The lock detector (LD) asserts HIGH when phase/frequency alignment is achieved, conditioned by CLD capacitor between pins 15 and 8.
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 point for FM demodulation or tone decoding. |
| VCO frequency linearity | 0.4% max at VCC = 4.5 V - ensures predictable, monotonic VCOIN-to-fVCO mapping for voltage-to-frequency conversion. |
| Duty factor (VCOOUT) | 50% ±1% - enables clean square-wave outputs suitable for direct clocking of digital logic without duty-cycle correction. |
| Demodulator offset (VCOIN→DEMOUT) | ±20 mV typical at VCC = 4.5 V - minimizes DC error in feedback path, critical for stable lock acquisition and low drift. |
| Lock detector output (LD) | Active HIGH, TTL-compatible - provides unambiguous system-level lock status for microcontroller monitoring or enable sequencing. |
| Input sensitivity (AC-coupled) | 15 mVp-p at 1 MHz - allows reliable detection of low-amplitude signals (e.g., audio-band tones) without preamplification. |
| Supply voltage range (digital) | 2.0–6.0 V - supports battery-powered and mixed-voltage embedded systems without level-shifting. |
Pinout & Package
74HC7046ADB,112 is housed in a 16-pin SO (Small Outline) package per JEDEC MS-012, with 1.27 mm pitch and gull-wing leads. 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 phase/frequency lock - used for status flagging or automatic gain control enable. |
| 2 (PC1OUT) | Phase comparator 1 output | XOR result fed to low-pass filter - average voltage proportional to phase difference; requires external RC filtering before VCOIN. |
| 3 (COMPIN) | Comparator input | Reference signal input for phase comparison - accepts direct or AC-coupled signals; self-bias circuit maintains linear operation for small swings. |
| 4 (VCOOUT) | VCO output | 50%-duty square wave; can drive COMPIN directly or feed external frequency divider for integer-N synthesis. |
| 5 (INH) | VCO inhibit control | Active HIGH disables VCO and DEMOUT - reduces standby current to ≤80 µA, enabling low-power sleep modes. |
| 6,7 (C1A, C1B) | VCO capacitor terminals | Connect external timing capacitor C1 (≥40 pF); differential connection improves noise immunity and linearity vs. single-ended. |
| 9 (VCOIN) | VCO input control voltage | Analog control node (1.1–3.4 V range); buffered op-amp input eliminates loading effects on loop filter. |
| 10 (DEMOUT) | Demodulator output | Buffered replica of VCOIN voltage - matches VCOIN exactly (not threshold-shifted), simplifying feedback design and calibration. |
| 11,12 (R1, R2) | VCO resistor connections | R1 sets base frequency; R2 adds programmable offset - parallel R1||R2 > 2.7 kΩ required for stable bias current. |
| 13 (PC2OUT) | Phase comparator 2 output | 3-state up/down counter output - drives low-pass filter with minimal ripple; enables fast lock and harmonic rejection. |
| 14 (SIGIN) | Signal input | Primary input for PLL reference or data stream - supports both DC- and AC-coupling; internal self-bias handles mV-level signals. |
| 15 (CLD) | Lock detector capacitor | Connects to GND (pin 8) via CLD capacitor - value determines lock detection time constant and hysteresis; selected per Fig.32. |
Key Features
| Feature | Design Value |
|---|---|
| Dual selectable phase comparators | PC1 (XOR) for high-noise environments; PC2 (edge-triggered JK) for wide capture range and harmonic immunity - user-selectable via external wiring. |
| VCO-inhibit control (INH) | Reduces quiescent supply current to ≤80 µA when disabled - enables battery-operated tone decoders or intermittent PLL operation. |
| Op-amp buffered DEMOUT | DEMOUT voltage equals VCOIN (not VCOIN − VTH) - eliminates calibration offsets and simplifies loop filter design for precision V/f conversion. |
| Self-biasing SIGIN amplifier | Maintains input transistors in linear region for signals as low as 15 mVp-p - eliminates need for external DC restoration in AC-coupled applications. |
| Passive second-order loop support | High-impedance VCOIN and DEMOUT allow standard RC low-pass filters - avoids active components, reducing BOM count and layout complexity. |
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; DEMOUT voltage reproduces modulating audio waveform. Use Value: Achieves <15 mVp-p input sensitivity and ±20 mV DEMOUT offset, enabling clean audio recovery without post-filtering. |
Use Scenario: Detecting DTMF or sub-audible tones in security panels or industrial controllers. IC Role / Device Role / Timing Role: Configured as narrowband frequency discriminator - PC2 locks to target tone; LD output triggers decode event. Use Value: Dual comparator choice allows PC1 for noise-prone environments or PC2 for fast tone acquisition (<100 ms lock time). |
| Frequency Synthesis | Motor-Speed Control |
Use Scenario: Generating precise clock multiples in instrumentation or communication subsystems. IC Role / Device Role / Timing Role: VCOOUT feeds programmable divider; feedback to COMPIN creates integer-N synthesizer with 50% duty output. Use Value: 0.4% VCO linearity and 17 MHz center frequency support stable synthesis up to 8.5 MHz with ±0.1% accuracy. |
Use Scenario: Closed-loop speed regulation of DC motors using back-EMF frequency feedback. IC Role / Device Role / Timing Role: Converts motor back-EMF frequency to proportional DC voltage (via VCOIN); drives PWM controller. Use Value: ±0.15%/K temperature stability and 3.0–6.0 V VCO supply range ensure consistent speed control across automotive ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phase-locked-loop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC4046M | Single-phase comparator (XOR only); no PC2; lower max VCO frequency (12 MHz typ. at 5 V); different pinout (no CLD, no R2). | Lacks edge-triggered comparator and lock detector capacitor terminal - unsuitable for PC2-based fast-lock or precise lock-hysteresis tuning. | Select only if legacy 4046 compatibility is required and PC2 functionality is unnecessary. |
| SN74LV4046AIPW | LV logic family (1.65–5.5 V); higher propagation delay (70 ns vs. 50 ns); no DEMOUT buffer; CLD pin omitted. | Lower supply range and missing DEMOUT limit use in precision V/f conversion or low-noise demodulation where exact VCOIN replication matters. | Prefer for ultra-low-voltage (1.8 V) systems where 74HC7046ADB,112's 2.0 V minimum is marginal. |
Compared with CD74HC4046M and SN74LV4046AIPW, the 74HC7046ADB,112 uniquely integrates dual comparators, buffered DEMOUT, and dedicated CLD terminal - enabling robust lock detection, flexible loop design, and superior linearity for demanding FM and synthesis tasks.
Availability
74HC7046ADB,112 is available at Aetrix Electronics and suitable for FM demodulation, tone decoding, frequency synthesis, and motor-speed control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 74HC7046ADB,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, with deep expertise in analog, mixed-signal, and logic ICs.
The 74HC7046ADB,112 belongs to NXP's legacy HC logic family - designed specifically for high-performance, low-power PLL applications in communications, instrumentation, and control systems where precision frequency management is critical.
FAQ
What is the maximum VCO center frequency achievable with 74HC7046ADB,112?
The 74HC7046ADB,112 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), operation up to 21 MHz is specified. This makes the 74HC7046ADB,112 suitable for FM IF demodulation and mid-band frequency synthesis where sub-20 MHz precision is required.
How does the dual phase comparator architecture benefit system design with 74HC7046ADB,112?
The 74HC7046ADB,112 offers two distinct phase comparators: PC1 (XOR) excels in noisy environments due to its inherent immunity to harmonics and high ripple rejection, while PC2 (edge-triggered JK) provides wider capture range, faster lock acquisition, and zero static phase error across the full VCO range. Selecting between them via external routing lets designers optimize for either robustness (PC1) or speed/accuracy (PC2) without changing the 74HC7046ADB,112 footprint.
What is the function of the DEMOUT pin on the 74HC7046ADB,112, and why is it critical?
The DEMOUT pin on the 74HC7046ADB,112 provides a buffered, exact replica of the VCOIN control voltage - unlike conventional PLLs where DEMOUT is offset by one threshold voltage. This eliminates calibration errors in voltage-to-frequency conversion and simplifies loop filter design. For applications like motor-speed control or precision V/f converters, using DEMOUT instead of VCOIN directly ensures the feedback path reflects true VCO control voltage, improving system accuracy and stability.
Can the 74HC7046ADB,112 operate from a 3.3 V supply, and what performance trade-offs apply?
Yes, the 74HC7046ADB,112 supports VCC from 2.0 V to 6.0 V, including 3.3 V operation. At 3.3 V, the VCO center frequency drops to ~7 MHz (typ.), and VCO linearity degrades slightly to ≤1.0%. Input sensitivity decreases to ~9 mVp-p, and lock detector response time increases. These trade-offs are acceptable for low-speed tone decoding or battery-powered sensor interfaces where power efficiency outweighs bandwidth.
What external components are mandatory for basic 74HC7046ADB,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 (value per Fig.32) between pin 15 and pin 8 (GND); and a low-pass filter (e.g., R3/C2) between PC1OUT or PC2OUT and VCOIN (pin 9). Omitting CLD disables lock detection; omitting R1 or C1 prevents VCO oscillation.
74HC7046ADB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-SSOP (0.209", 5.30mm 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:
- 3V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SSOP
74HC7046ADB,112 FAQ
1.How can I place an order for 74HC7046ADB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC7046ADB,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 74HC7046ADB,112 reliable?
The price and inventory of 74HC7046ADB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7046ADB,112 is usually 5 days.
3.What payment methods are accepted for 74HC7046ADB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7046ADB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC7046ADB,112?
74HC7046ADB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC7046ADB,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 74HC7046ADB,112?
For technical support, including 74HC7046ADB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7046ADB,112 requirements.
6.How does Aetrix verify that 74HC7046ADB,112 is sourced from the original manufacturer or authorized distributors?
All 74HC7046ADB,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 74HC7046ADB,112 meets industry standards.
7.What is the process for return or replacement of 74HC7046ADB,112?
All 74HC7046ADB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7046ADB,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 74HC7046ADB,112 part is unused and in its original packaging.
Return procedure for 74HC7046ADB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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