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Texas Instruments CDCM7005RGZT
- Part No.:
- CDCM7005RGZT
- Manufacturer:
- Texas Instruments
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
CDCM7005RGZT.pdf
- Description:
- IC CLOCK SYNCHRONIZER 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,007
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Product details
Overview
CDCM7005RGZT from Texas Instruments is a 3.3-V high-performance clock synchronizer and jitter cleaner IC that locks a VCXO_IN input (up to 2.2 GHz LVPECL) to either PRI_REF or SEC_REF reference clocks, delivers up to five LVPECL or ten LVCMOS outputs with individually selectable ×1, /2, /3, /4, /6, /8, or /16 division, and features programmable phase offset, analog/digital PLL lock indication, and frequency hold-over mode for wireless infrastructure timing systems.
For engineers reviewing the CDCM7005RGZT datasheet, CDCM7005RGZT pinout, CDCM7005RGZT application, or CDCM7005RGZT equivalent, this page provides verified functional identity, confirmed 48-pin VQFN (RGZ) package mapping, validated pin roles including VCXO_IN differential input and Y0A–Y4B programmable outputs, real-world jitter cleaning performance metrics, and two documented alternative clock synchronizers for SONET and data communication designs.
Technical Context
The CDCM7005RGZT implements a low-phase-noise PLL architecture with independently configurable pre-divider M, feedback dividers N and P, and dedicated VCC_CP supply enabling wide tuning voltage range for external VCXOs. Its dual-reference selection (PRI_REF/SEC_REF) supports manual (REF_SEL) or automatic failover with frequency hold-over mode.
It integrates synchronization latches across all outputs to minimize skew, supports SPI-programmable output signaling (LVPECL/LVCMOS), divider values, and lock-detect window parameters, and provides VBB bias voltage (VCC – 1.3 V) for single-ended VCXO_IN termination while maintaining <50 ps LVPECL output skew under matched division ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3 V nominal (3.0–3.6 V), with separate AVCC and VCC_CP (2.3–3.6 V) rails for analog integrity and VCO compatibility |
| VCXO_IN Input Frequency | Up to 2.2 GHz LVPECL - enables direct interface to high-frequency VCXOs without external prescaling |
| Reference Inputs | PRI_REF and SEC_REF accept LVCMOS signals up to 200 MHz with internal 150-kΩ pullups and hysteresis |
| Output Configuration | Up to five differential LVPECL or ten single-ended LVCMOS outputs, each with independent ÷1, ÷2, ÷3, ÷4, ÷6, ÷8, or ÷16 division |
| Phase Noise Performance | Low-phase-noise PLL core with programmable charge pump current (200 μA to 3 mA) and adjustable loop bandwidth via external filter |
| Operating Temperature | –40°C to +85°C industrial range - qualified for base station and test equipment environments |
| Package | 48-pin VQFN (RGZ), 7.0 mm × 7.0 mm, 0.5-mm pitch, thermally enhanced with exposed pad soldered to GND |
Pinout & Package
Package: 48-pin VQFN (RGZ), 7.0 mm × 7.0 mm body, 0.5-mm pitch, thermal pad required to be soldered to ground plane for thermal management and noise suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCXO_IN / VCXO_IN | Differential LVPECL input | Primary VCXO/VCO clock input pair; accepts up to 2.2 GHz; complementary pins require matched trace lengths and 100-Ω differential termination |
| PRI_REF / SEC_REF | LVCMOS reference inputs | Redundant reference clock sources with internal 150-kΩ pullups; support automatic/manual selection via REF_SEL |
| Y0A–Y4B | Programmable outputs | Five differential LVPECL output pairs (Y0A/Y0B through Y4A/Y4B); each pair configurable as LVPECL or LVCMOS via SPI |
| VCC_CP | Charge pump power supply | Independent 2.3–3.6 V rail for charge pump - matches external VCXO tuning voltage range and avoids coupling noise into VCC/AVCC |
| VBB | Bias voltage output | Provides VCC – 1.3 V for DC biasing of unused VCXO_IN complement in single-ended configurations; current-limited to ~1.5 mA |
| CTRL_LE / CTRL_CLK / CTRL_DATA | SPI control interface | 3-wire serial programming interface with hysteresis; all inputs require 20-kΩ+ pull-up to VCC if unused |
Key Features
| Feature | Design Value |
|---|---|
| Programmable phase offset | Adjusts timing alignment between PRI_REF/SEC_REF and any Yx output - enables precise system-level skew compensation in multi-board sync |
| Dual-reference redundancy | Automatic or manual switching between PRI_REF and SEC_REF with frequency hold-over mode - maintains stable output during reference loss in telecom systems |
| Flexible output signaling | Each of five output pairs can be independently configured as LVPECL or LVCMOS via SPI register Word 1 Bits 2–6 - eliminates need for external level translators |
| Dedicated VCC_CP supply | Isolates charge pump from digital/analog supplies - supports wide-tuning-range VCXOs (e.g., 2.5–3.3 V tuning voltage) without compromising PLL stability |
| Low-skew synchronization | Built-in synchronization latches ensure sub-50-ps LVPECL output skew when dividers match - critical for parallel SERDES clock distribution |
Applications
| Wireless Base Station Timing | SONET/SDH Line Cards |
|---|---|
Use Scenario: Synchronizing multiple RF transceivers and digital front-end FPGAs to a common stratum-3-compliant clock source in macrocell BTS. IC Role / Device Role / Timing Role: Jitter cleaner and reference selector that locks local VCXO to GPS-disciplined PRI_REF or backup SEC_REF, then distributes low-skew LVPECL clocks to ADC/DAC and FPGA fabric. Use Value: Achieves <1 ps RMS jitter at 122.88 MHz output after cleaning 100-fs RMS reference jitter - meets CPRI and OBSAI deterministic latency requirements. | Use Scenario: Providing synchronized clocking for OC-192/STM-64 framer, mapper, and PHY ICs on optical line interface cards. IC Role / Device Role / Timing Role: Clock synchronizer generating multiple divided frequencies (e.g., 155.52 MHz, 622.08 MHz, 2.488 GHz) from a common 19.44 MHz reference while maintaining tight inter-channel skew. Use Value: Delivers <50 ps LVPECL output skew across all five Yx pairs - ensures deterministic bit alignment across parallel SONET framers and reduces BER in long-haul transmission. |
| Data Center Test Equipment | High-Speed Instrumentation |
Use Scenario: Generating precise, low-jitter stimulus clocks for BERT and protocol analyzers validating 10G/25G Ethernet and PCIe Gen4 links. IC Role / Device Role / Timing Role: Jitter cleaner feeding VCXO_IN with cleaned 156.25 MHz reference, then producing multiple phase-aligned LVPECL outputs for transmitter/receiver clock domains. Use Value: Enables <0.3 ps RMS integrated jitter (12 kHz–20 MHz) on 2.5 GHz outputs - exceeds IEEE 802.3ba jitter compliance thresholds for 25G KR testing. | Use Scenario: Serving as master clock generator in high-resolution oscilloscopes and arbitrary waveform generators requiring ultra-low phase noise and fast lock acquisition. IC Role / Device Role / Timing Role: High-stability PLL synchronizer accepting oven-controlled crystal oscillator (OCXO) reference and delivering clean, programmable LVPECL outputs with user-defined phase offsets. Use Value: Supports <200 fs RMS phase noise at 10 kHz offset from 1 GHz carrier - improves time-domain resolution in sub-picosecond sampling applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock synchronizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMK04828BISQE/NOPB | Higher integration: includes dual-loop architecture, integrated LDOs, and JESD204B SYSREF support; requires external VCXO only for second loop | Targeted at JESD204B-compliant data converters and radar systems; not optimized for pure VCXO-based hold-over | Select when needing SYSREF generation, lower power per output, or tighter jitter specs (<100 fs RMS) at cost of larger footprint and higher complexity |
| Si5341-A01A-GM | Multi-input, multi-output clock generator with fractional-N synthesis; no native VCXO_IN pin - uses internal VCO + external loop filter | Designed for flexible frequency translation in packet-switched networks; lacks dedicated frequency hold-over mode and analog lock detect | Select when requiring >12 outputs, sub-Hz frequency resolution, or multi-protocol support (SyncE, IEEE 1588), but avoid where VCXO-based fail-safe operation is mandatory |
Compared with LM5341-A01A-GM and LMK04828BISQE/NOPB, the CDCM7005RGZT offers superior frequency hold-over reliability via direct VCXO_IN locking and analog lock detection, simpler configuration for fixed-ratio jitter cleaning, and lower system-level BOM count in telecom timing applications where VCXO stability is prioritized over synthesis flexibility.
Availability
CDCM7005RGZT is available at Aetrix Electronics and suitable for wireless infrastructure, SONET line cards, and high-speed test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for CDCM7005RGZT 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies with broad industrial, automotive, and communications market reach.
The CDCM7005RGZT belongs to TI's high-performance clock synchronization product line, designed specifically for telecom infrastructure and test equipment demanding low-jitter, redundant-reference clock recovery with VCXO-based hold-over capability.
FAQ
What is the maximum input frequency supported by CDCM7005RGZT on the VCXO_IN pins?
The CDCM7005RGZT supports VCXO_IN input frequencies up to 2.2 GHz in LVPECL format. This specification is confirmed in the device's datasheet (SCAS793G, Section 1 Features) and applies directly to the CDCM7005RGZT variant in the 48-pin VQFN package. Operation above 2.2 GHz is not characterized and may result in degraded lock performance or failure to acquire phase lock.
Does CDCM7005RGZT support both LVPECL and LVCMOS outputs simultaneously?
Yes, the CDCM7005RGZT supports mixed-mode output configuration: any combination of up to five LVPECL outputs or up to ten LVCMOS outputs can be active simultaneously. Output type per channel is configured via SPI register Word 1 (Bits 2–6), and the CDCM7005RGZT powers up with all outputs set to LVPECL. This capability is explicitly documented in the "Features" and "Pin Functions" sections of the official datasheet.
What is the function of the VBB pin on CDCM7005RGZT?
The VBB pin on CDCM7005RGZT provides a bias voltage output of VCC – 1.3 V, intended to DC-bias the unused complement of the VCXO_IN differential input when operating in single-ended mode. It is current-limited to approximately 1.5 mA and must not be loaded beyond this limit. This functionality is defined in the Pin Functions table (Section 6) of the CDCM7005RGZT datasheet and is specific to the RGZ package variant.
How does CDCM7005RGZT implement frequency hold-over mode?
The CDCM7005RGZT implements frequency hold-over mode by freezing the charge pump in 3-state during loss of valid reference clocks (PRI_REF and SEC_REF), allowing the external VCXO to maintain oscillation at its last-tuned frequency. The HOLD pin (pin 14 in RGZ) triggers this mode, and the device resumes normal PLL operation upon return of a valid reference. This behavior is detailed in the Pin Functions section for HOLD/RESET and confirmed in the "Frequency Hold-Over Mode" subsection of the datasheet.
Is CDCM7005RGZT pin-compatible with other packages of the CDCM7005 family?
No, the CDCM7005RGZT (48-pin VQFN) is not pin-compatible with the CDCM7005ZVA (64-pin BGA) variant. Pin counts, layouts, and terminal assignments differ significantly - for example, the RGZ package places VCXO_IN on pins 42 and 43, while ZVA assigns them to E1 and D1. Engineers must use package-specific layout files and cannot substitute one for the other without PCB redesign. This distinction is clearly shown in the "Pin Configuration and Functions" section of the CDCM7005RGZT datasheet.
CDCM7005RGZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock Synchronizer and Jitter Cleaner
- PLL:
- Yes with Bypass
- Input:
- LVCMOS, LVPECL
- Output:
- LVCMOS, LVPECL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 3:10
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- 1.5GHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
CDCM7005RGZT FAQ
1.How can I place an order for CDCM7005RGZT through Aetrix?
Please submit a Request for Quotation (RFQ) for CDCM7005RGZT 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 CDCM7005RGZT reliable?
The price and inventory of CDCM7005RGZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDCM7005RGZT is usually 5 days.
3.What payment methods are accepted for CDCM7005RGZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDCM7005RGZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDCM7005RGZT?
CDCM7005RGZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDCM7005RGZT 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 CDCM7005RGZT?
For technical support, including CDCM7005RGZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDCM7005RGZT requirements.
6.How does Aetrix verify that CDCM7005RGZT is sourced from the original manufacturer or authorized distributors?
All CDCM7005RGZT 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 CDCM7005RGZT meets industry standards.
7.What is the process for return or replacement of CDCM7005RGZT?
All CDCM7005RGZT units undergo pre-shipment inspection (PSI). If there is an issue with CDCM7005RGZT, 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 CDCM7005RGZT part is unused and in its original packaging.
Return procedure for CDCM7005RGZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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