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NXP Semiconductors MC145158DW2
- Part No.:
- MC145158DW2
- Manufacturer:
- NXP Semiconductors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC145158DW2.pdf
- Description:
- IC PLL CLOCK/FREQ SYNTH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,817
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Product details
Overview
MC145158DW2 from Freescale Semiconductor (formerly Motorola) is a serial-input, dual-modulus CMOS frequency synthesizer IC designed for PLL-based RF systems. It integrates a 14-bit programmable reference divider (÷R), 10-bit ÷N counter, and 7-bit ÷A counter, operates from 3.0–9.0 V, supports on-chip crystal oscillator up to 10 MHz, and delivers lock detection and dual-phase detector outputs (φR/φV). It is used in UHF/VHF two-way radios requiring precise channel spacing.
For engineers reviewing the MC145158DW2 datasheet, MC145158DW2 pinout, MC145158DW2 application, or MC145158DW2 equivalent, key selection criteria include its serial SPI-compatible programming interface, dual-modulus prescaler control (MC output), 500 mVp-p ac-coupled fin input sensitivity, and compatibility with external 64/65 or 128/129 prescalers in land mobile radio designs.
Technical Context
The MC145158DW2 implements a digital phase-locked loop architecture with separate shift-register-based programming for ÷R, ÷N, and ÷A counters. Its control logic generates the MC signal to switch an external dual-modulus prescaler between P and P+1 division ratios, enabling synthesis of non-integer frequency steps.
It features a linearized digital phase detector with both single-ended (PDout) and double-ended (φR/φV) error outputs, plus buffered fR and fV signals for external monitoring. The ENB-controlled latch mechanism ensures deterministic counter updates without spurious glitches during serial data loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–9.0 V - Enables direct operation from common battery or regulated rail without level-shifting. |
| ÷R Range | 3–16383 - Supports fine reference resolution down to sub-kHz channel spacing in CATV or scanning receivers. |
| ÷N Range | 3–1023 - Sets main division ratio; combined with ÷A enables total NT = N×P + A synthesis over wide bands. |
| ÷A Range | 0–127 - Controls prescaler modulus switching count; determines fractional division granularity. |
| fin Input Sensitivity | ≥500 mVp-p ac-coupled - Allows direct connection to prescaler outputs without amplification. |
| Operating Temp | –40°C to +85°C - Qualified for industrial and mobile radio environments without derating. |
| Logic Family | CMOS - Ensures low static current (<100 µA typical) and high noise immunity in RF-dense layouts. |
Pinout & Package
SOG package (Case 751G), 16-pin surface-mount small-outline package with gull-wing leads, 1.27 mm pitch, body size 10.2 × 7.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OSCin / OSCout | Crystal oscillator terminals - Enable self-contained 1–10 MHz reference generation with external parallel-resonant crystal and load caps. |
| 3 | fV | ÷N counter output - Buffered fin/N signal for external phase comparison or diagnostic monitoring. |
| 4 | VDD | Positive supply - Accepts 3–9 V; decoupling capacitor required near pin for stable PLL operation. |
| 5 | PDout | Three-state phase detector A output - Provides single-ended error signal compatible with op-amp loop filters. |
| 6 | VSS | Ground reference - Must be low-impedance connection shared with VCO and loop filter ground plane. |
| 7 | LD | Lock detect output - Active-high open-drain signal indicating fR = fV and phase alignment within tolerance. |
| 8 | fin | VCO/prescaler input - Rising-edge triggered; accepts ac-coupled signals ≥500 mVp-p or CMOS-level dc-coupled inputs. |
| 9, 10 | CLK / DATA | Serial programming interface - SPI-compatible clock/data pair for loading ÷R, ÷N, and ÷A values via shift register. |
| 11 | ENB | Latch enable - High pulse transfers serially loaded data into active counter latches; prevents partial updates. |
| 12 | S/Rout | Shift register output - Enables daisy-chaining or band-switching control using unused MSBs of serial stream. |
| 13 | fR | ÷R counter output - Buffered reference-divided signal; usable as secondary LO or MCU clock source. |
| 14 | REFout | Crystal oscillator buffer - Provides clean 1–10 MHz output for driving additional circuitry or second synthesizer. |
| 15, 16 | φV / φR | Phase detector B outputs - Rail-to-rail complementary signals for differential loop filtering or noise-rejecting combiners. |
| - | MC | Dual-modulus control - Output drives external prescaler's modulus-select pin; low = P, high = P+1 division mode. |
Key Features
| Feature | Design Value |
|---|---|
| Serial SPI-compatible programming | Reduces PCB routing complexity vs. parallel-input variants; enables microcontroller-driven channel hopping. |
| Dual-modulus prescaler control (MC output) | Enables synthesis across wide frequency bands (e.g., 400–520 MHz) using cost-effective 64/65 prescalers. |
| Linearized digital phase detector | Improves PLL transfer function linearity, reducing reference spurs and improving settling time in narrow-loop designs. |
| Buffered fR and fV outputs | Allows real-time verification of reference and VCO feedback paths without disturbing PLL operation. |
| 500 mVp-p fin input sensitivity | Eliminates need for front-end amplification when interfacing with low-output prescalers like MC12017. |
Applications
| UHF Land Mobile Radio | VHF Scanning Receiver |
|---|---|
Use Scenario: 440–470 MHz transceiver with 25 kHz channel spacing and 45 MHz IF. IC Role / Device Role / Timing Role: Frequency synthesizer core generating local oscillator signals for up/down conversion via dual-modulus prescaler. Use Value: MC145158DW2's MC output directly controls MC12017 64/65 prescaler; serial programming enables rapid channel switching under MCU control. | Use Scenario: Wideband receiver covering 30–512 MHz with automatic band scanning and memory storage. IC Role / Device Role / Timing Role: Programmable reference generator and VCO controller enabling step-tuned LO synthesis across multiple octaves. Use Value: 14-bit ÷R range allows sub-kHz reference resolution; REFout provides stable clock for scan controller MCU. |
| Amateur Radio Transceiver | CATV Channel Synthesizer |
Use Scenario: HF/VHF transceiver supporting SSB/CW modes with fast lock time and low phase noise. IC Role / Device Role / Timing Role: Core PLL component generating transmit/receive LOs with T/R offset adder functionality. Use Value: T/R input (via ENB-controlled logic path) applies fixed 856-count offset to ÷N value, simplifying duplex IF alignment. | Use Scenario: Set-top box tuner synthesizing 54–864 MHz CATV channels with 6 MHz spacing. IC Role / Device Role / Timing Role: Reference divider and feedback divider in cascaded PLL architecture with external VCO and loop filter. Use Value: PDout and φR/φV outputs support flexible loop filter topologies; LD output feeds system status indicator or auto-calibration logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar frequency synthesizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145152DW2 | Parallel-input, 10-bit ÷N + 6-bit ÷A; no serial interface; fixed 8-value ÷R table (not fully programmable). | Requires 16 dedicated GPIO lines; suited for fixed-channel or DIP-switch programmed radios. | Select when board space permits parallel wiring and firmware lacks SPI resources. |
| Si4133-B-GM | Fully integrated PLL + VCO; 2.7–3.6 V only; I²C interface; built-in charge pump and loop filter support. | Eliminates external VCO and loop filter components but lacks MC145158DW2's discrete prescaler control flexibility. | Select for compact, low-power consumer designs where integration outweighs prescaler customization needs. |
Compared with MC145152DW2, MC145158DW2 reduces GPIO count by >70% and enables dynamic channel reprogramming; compared with Si4133-B-GM, it retains full control over external VCO selection, loop filter design, and prescaler topology for demanding RF performance.
Availability
MC145158DW2 is available at Aetrix Electronics and suitable for UHF/VHF two-way radios, amateur transceivers, scanning receivers, and CATV tuners requiring stable component supply across extended production lifecycles.
Supply support for MC145158DW2 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 legacy leader in analog and mixed-signal RF ICs, with deep expertise in communication synthesizers and automotive-grade timing solutions.
The MC14515x family was designed specifically for cost-sensitive, high-reliability RF systems in land mobile, amateur, and broadcast equipment - emphasizing low power, wide supply range, and robust ESD/latch-up performance.
FAQ
What is the maximum reference oscillator frequency supported by MC145158DW2?
The MC145158DW2 supports on-chip crystal oscillator operation up to 10 MHz using external parallel-resonant crystals connected to OSCin/OSCout. When using an external reference signal applied to OSCin, frequencies up to 10 MHz are also supported with standard CMOS logic levels or ac-coupled inputs. Higher frequencies require external prescaling before reaching the ÷R counter.
Does MC145158DW2 support both single-ended and differential phase detector outputs?
Yes, MC145158DW2 provides three phase detector outputs: PDout (single-ended, three-state), and φR/φV (complementary double-ended). PDout delivers rail-to-rail pulses with high-impedance state at lock; φR and φV operate in push-pull fashion - one pulses low while the other stays high during error conditions - enabling noise-immune loop filtering.
How does the MC output of MC145158DW2 interface with external dual-modulus prescalers?
The MC output of MC145158DW2 is a CMOS-level control signal that switches an external dual-modulus prescaler (e.g., MC12017) between its two division ratios: low MC selects P (e.g., 64), high MC selects P+1 (e.g., 65). This enables fractional-N synthesis where total division NT = N×P + A, with A set by the internal ÷A counter.
Can MC145158DW2 be used without an external crystal?
Yes, MC145158DW2 can operate with an external reference signal applied to OSCin - such as a TCXO or clock generator - eliminating the need for a crystal. In this mode, OSCout is left unconnected. The device accepts ac-coupled or dc-coupled CMOS-level inputs up to 10 MHz, maintaining full ÷R programmability and lock detection functionality.
What is the function of the ENB pin on MC145158DW2?
The ENB (Enable) pin on MC145158DW2 is an active-high latch control. When pulsed high, it transfers the most recently shifted serial data from the internal shift registers into the target counter latches (÷R, ÷N, or ÷A) based on the final control bit. Holding ENB low allows safe data loading without affecting active counters - critical for glitch-free channel changes in MC145158DW2-based radios.
MC145158DW2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- PLL Clock/Frequency Synthesizer
- PLL:
- Yes
- Input:
- Clock
- Output:
- Clock
- 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:
- 16-SOIC
MC145158DW2 FAQ
1.How can I place an order for MC145158DW2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC145158DW2 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 MC145158DW2 reliable?
The price and inventory of MC145158DW2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145158DW2 is usually 5 days.
3.What payment methods are accepted for MC145158DW2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145158DW2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC145158DW2?
MC145158DW2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC145158DW2 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 MC145158DW2?
For technical support, including MC145158DW2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145158DW2 requirements.
6.How does Aetrix verify that MC145158DW2 is sourced from the original manufacturer or authorized distributors?
All MC145158DW2 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 MC145158DW2 meets industry standards.
7.What is the process for return or replacement of MC145158DW2?
All MC145158DW2 units undergo pre-shipment inspection (PSI). If there is an issue with MC145158DW2, 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 MC145158DW2 part is unused and in its original packaging.
Return procedure for MC145158DW2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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