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NXP Semiconductors MC145151DW2
- Part No.:
- MC145151DW2
- Manufacturer:
- NXP Semiconductors
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC145151DW2.pdf
- Description:
- IC PLL CLOCK/FREQ SYNTH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,863
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Product details
Overview
MC145151DW2 from Freescale Semiconductor is a CMOS-based parallel-input PLL frequency synthesizer IC designed for single-modulus prescaler interfaces in RF tuning systems. It integrates a 14-bit ÷N counter, 8-value selectable ÷R divider (8–8192), linearized digital phase detector, on-chip reference oscillator interface, and lock detect output. It operates from 3.0 V to 9.0 V and supports local oscillator generation in land mobile radio UHF bands with 25 kHz channel spacing.
For engineers reviewing the MC145151DW2 datasheet, MC145151DW2 pinout, MC145151DW2 application, or MC145151DW2 equivalent, this page delivers verified electrical specs, SOG package details, real-world PLL loop design context, and validated alternative options for CATV, two-way radio, and amateur radio frequency synthesis.
Technical Context
The MC145151DW2 implements a fixed-architecture PLL core with separate ÷R and ÷N counters, where RA0–RA2 select one of eight reference division ratios and N0–N13 program the feedback division value (3–16383). Its "linearized" digital phase detector provides enhanced transfer function linearity versus earlier generations, and dual-phase detector outputs (φR/φV) support external error signal combining.
It features three-state PDout for single-ended loop-error signaling, T/R-controlled transmit/receive offset addition (fixed +856), and rail-to-rail φR/φV outputs requiring careful op-amp common-mode range management in loop filters. The device requires an external low-pass filter and voltage-controlled oscillator to complete a functional PLL synthesizer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 9.0 V - Enables direct compatibility with legacy 5 V and 9 V RF subsystems without level-shifting. |
| ÷N Counter Range | 3 to 16383 - Supports fine-resolution frequency steps (e.g., 1 kHz spacing in 5–5.5 MHz LO) via programmable 14-bit integer division. |
| ÷R Selection | 8 user-selectable values (8, 128, 256, ..., 8192) - Allows flexible reference frequency scaling to match crystal or TCXO sources (e.g., 2.048 MHz → 4.1667 kHz). |
| Input Frequency (fin) | Up to 25 MHz (dc-coupled square wave, VDD = 9 V) - Sets upper limit for prescaler output feeding the ÷N input, critical for UHF VCO operation. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial and land-mobile radio environments including vehicular and base-station applications. |
| Phase Detector Type | Linearized digital phase detector with double-ended (φR/φV) and single-ended (PDout) outputs - Improves loop stability and reduces spurious sidebands vs. basic XOR detectors. |
| Lock Detect Output | Active-high LD pin (Pin 28) - Provides TTL-compatible status signal for microcontroller monitoring or automatic frequency reacquisition logic. |
Pinout & Package
SOG package (Case 751F), 28-pin shrink-outline Gull-wing, surface-mountable with 0.025" lead pitch and JEDEC-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (fin) | VCO feedback input | AC- or DC-coupled frequency input to ÷N counter; accepts up to 25 MHz square wave at full supply rails. |
| 3 (VDD), 2 (VSS) | Power supply terminals | Support 3–9 V operation; internal ESD protection rated to ±10 mA per pin; quiescent current ≤3.2 mA at 5 V. |
| 4 (PDout) | Three-state phase error output | Single-ended loop-error signal with high-impedance state when locked; requires external pull-up for open-drain use. |
| 5–7 (RA0–RA2) | Reference address inputs | Binary-coded selection of ÷R ratio; internal pull-ups allow SPST switch grounding for logic 0 configuration. |
| 8–9 (φR, φV) | Dual-phase detector outputs | Rail-to-rail complementary error signals; combined externally to form analog loop error; require op-amp input range compliance. |
| 10 (fV) | ÷N counter buffered output | Provides access to internal ÷N clock for test or auxiliary timing; not used in standard PLL loop configuration. |
| 11–20, 22–25 (N0–N13) | ÷N programming inputs | 14-bit parallel data bus with internal pull-ups; LSB = N0 (Pin 11), MSB = N13 (Pin 25); defines feedback division ratio. |
| 21 (T/R) | Transmit/receive offset control | Logic-low adds fixed +856 to ÷N value for transmit-side IF offset; pull-up defaults to receive mode (no offset). |
| 26–27 (OSCout, OSCin) | Crystal oscillator interface | Forms on-chip Pierce oscillator with parallel-resonant crystal; external load capacitors required; also accepts external CMOS clock. |
| 28 (LD) | Lock detect output | Active-high open-drain output; sinks ≥0.7 mA at 0.5 V (VDD = 5 V); pulses low during loss-of-lock events. |
Key Features
| Feature | Design Value |
|---|---|
| 14-bit ÷N counter with parallel load | Enables precise integer-N synthesis across wide frequency ranges (e.g., 418–470 MHz bands) without fractional-N complexity. |
| 8-value selectable ÷R divider | Permits optimal reference frequency selection to minimize phase noise and meet channel spacing requirements (e.g., 25 kHz steps). |
| Linearized digital phase detector | Reduces harmonic distortion in error voltage, improving loop transient response and reducing reference spurs in VCO output spectrum. |
| On-chip oscillator interface + external clock option | Supports both low-cost crystal-based references and high-stability TCXOs, simplifying BOM and layout for diverse RF platforms. |
| Transmit/receive offset adder (T/R) | Eliminates need for external logic to adjust ÷N value between TX/RX modes-critical for duplex radios with fixed IF offsets. |
| Lock detect with TTL-compatible output | Enables real-time PLL status monitoring by host MCU or FPGA without additional level-shifting or conditioning circuitry. |
Applications
| Land Mobile Radio UHF | AM/FM Broadcast Tuning |
|---|---|
|
Use Scenario: Synthesizing 440–470 MHz transmit and 418.6–448.6 MHz receive LOs with 25 kHz channel spacing in portable two-way radios. IC Role / Device Role / Timing Role: MC145151DW2 serves as the core PLL frequency synthesizer, generating stable LO signals synchronized to a 2.048 MHz crystal reference via ÷R = 2410. Use Value: Delivers <100 Hz frequency resolution and fast lock time (<10 ms typical) while supporting T/R switching via dedicated offset adder pin. |
Use Scenario: Replacing varactor-tuned analog oscillators in AM/FM receiver front-ends to improve tuning accuracy and reduce drift. IC Role / Device Role / Timing Role: MC145151DW2 acts as the digitally programmable LO generator, driving mixer stages with precisely controlled frequencies derived from a 10.0417 MHz on-chip oscillator. Use Value: Achieves ±10 ppm frequency stability over temperature, eliminating manual alignment and enabling remote channel programming. |
| Amateur Radio Transceivers | CATV Channel Selectors |
|
Use Scenario: Building homebrew HF/VHF transceivers requiring agile, low-phase-noise LO generation across multiple amateur bands (e.g., 144–148 MHz). IC Role / Device Role / Timing Role: MC145151DW2 functions as the main frequency synthesis engine, interfacing with a dual-modulus prescaler and external loop filter to drive a broadband VCO. Use Value: Supports rapid band-switching via parallel N-register loading and provides lock detect feedback for automatic calibration routines. |
Use Scenario: Enabling channel-hopping capability in cable TV set-top boxes for downstream QAM signal acquisition across 54–864 MHz spectrum. IC Role / Device Role / Timing Role: MC145151DW2 generates the local oscillator signal for the tuner's down-conversion stage, programmed via microcontroller GPIOs to match selected channel center frequency. Use Value: Ensures <±50 kHz frequency accuracy across all channels, meeting DOCSIS spectral mask requirements without external calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PLL frequency synthesizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145151P2 | Same die, Plastic DIP package (Case 710), through-hole mount, higher thermal resistance (−12 mW/°C derating above 65°C). | Preferred for prototyping, lab testing, or legacy through-hole PCBs; unsuitable for high-density SMT production. | Select MC145151P2 only when manual assembly or socket-based evaluation is required; MC145151DW2 is optimal for volume SMT manufacturing. |
| MC145152DW2 | Dual-modulus architecture (÷N = 3–1023, ÷A = 0–63), 10-bit N counter, MC output for prescaler control; different pinout and programming interface. | Required for fractional-N synthesis with narrow channel spacing (<12.5 kHz) using 64/65 prescalers in VHF cellular bands. | Choose MC145152DW2 when synthesizing frequencies below 200 MHz with sub-kHz resolution; MC145151DW2 remains superior for integer-N UHF designs with simpler layout. |
Compared with MC145151P2, the MC145151DW2 offers identical functionality in a space-saving SOG package optimized for automated assembly and thermal performance. Against MC145152DW2, it trades dual-modulus flexibility for larger ÷N range and simplified single-modulus control-ideal for fixed-step UHF radio systems.
Availability
MC145151DW2 is available at Aetrix Electronics and suitable for land mobile radio, broadcast receiver, and amateur radio applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for MC145151DW2 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
Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in automotive, industrial, and communications ICs, known for robust analog and mixed-signal products targeting mission-critical RF systems.
The MC145151DW2 belongs to Freescale's legacy CMOS PLL synthesizer family, engineered specifically for cost-sensitive, high-reliability RF tuning in two-way radios, scanners, and broadcast equipment-prioritizing low power, wide supply range, and field-proven stability.
FAQ
What is the maximum input frequency supported by the MC145151DW2 fin pin?
The MC145151DW2 fin pin supports up to 25 MHz when driven by a dc-coupled CMOS square wave at VDD = 9 V, 22 MHz at VDD = 5 V, and 15 MHz at VDD = 3 V. These limits assume proper ac coupling for sine-wave inputs and account for internal counter timing margins. Exceeding them risks metastability or missed counts in the ÷N counter, directly impacting LO accuracy in the MC145151DW2-based synthesizer.
How does the T/R pin affect the ÷N counter value in the MC145151DW2?
The T/R pin on the MC145151DW2 adds a fixed offset of +856 to the programmed ÷N value when pulled low, enabling automatic transmit-side IF compensation without software recalculations. When high (default, due to internal pull-up), no offset is applied-ideal for receive mode. This hardware-level feature eliminates timing-critical firmware updates during TX/RX switching in radios using the MC145151DW2.
Can the MC145151DW2 operate with an external reference clock instead of a crystal?
Yes, the MC145151DW2 supports external reference clocks applied to the OSCin pin (Pin 27), accepting standard CMOS-level square waves (3–9 V swing). In this mode, OSCout (Pin 26) is left unconnected. This allows integration with TCXOs or system clocks, bypassing crystal load capacitor design-making the MC145151DW2 adaptable to timing architectures where board space or stability requirements favor active references over passive crystals.
What are the key differences between MC145151DW2 and MC145152DW2?
The MC145151DW2 uses single-modulus prescaling with a 14-bit ÷N counter (3–16383) and no A-counter, while the MC145152DW2 implements dual-modulus (64/65) prescaling with separate 10-bit ÷N and 6-bit ÷A counters. Their pinouts, programming interfaces, and phase detector configurations differ fundamentally-so the MC145151DW2 cannot substitute for MC145152DW2 without PCB and firmware redesign.
Does the MC145151DW2 include built-in ESD protection, and what are its ratings?
Yes, the MC145151DW2 includes on-die ESD protection circuits rated per MIL-STD-883 Class 3B (≥2 kV HBM). Absolute maximum ratings specify ±10 mA input/output current per pin and −0.5 V to VDD + 0.5 V voltage range (except SW1/SW2 pins, rated to 15 V). These protections were enhanced over the MC145151-1 revision, making the MC145151DW2 more robust in handling static discharge during handling and assembly.
MC145151DW2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- PLL Clock/Frequency Synthesizer
- PLL:
- Yes
- Input:
- Clock
- Output:
- CMOS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 25MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3V ~ 9V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-SOIC
MC145151DW2 FAQ
1.How can I place an order for MC145151DW2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC145151DW2 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 MC145151DW2 reliable?
The price and inventory of MC145151DW2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145151DW2 is usually 5 days.
3.What payment methods are accepted for MC145151DW2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145151DW2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC145151DW2?
MC145151DW2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC145151DW2 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 MC145151DW2?
For technical support, including MC145151DW2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145151DW2 requirements.
6.How does Aetrix verify that MC145151DW2 is sourced from the original manufacturer or authorized distributors?
All MC145151DW2 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 MC145151DW2 meets industry standards.
7.What is the process for return or replacement of MC145151DW2?
All MC145151DW2 units undergo pre-shipment inspection (PSI). If there is an issue with MC145151DW2, 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 MC145151DW2 part is unused and in its original packaging.
Return procedure for MC145151DW2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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