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Analog Devices Inc. LTC6950IUHH#TRPBF
- Part No.:
- LTC6950IUHH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC6950IUHH#TRPBF.pdf
- Description:
- IC CLK/FREQ SYNTH 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,298
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Product details
Overview
LTC6950IUHH#TRPBF from Analog Devices (formerly Linear Technology) is a low-phase-noise integer-N PLL frequency synthesizer with integrated clock distribution. It delivers five independently programmable outputs-four 1.4GHz LVPECL and one configurable LVDS/CMOS-each with divider (1–63) and delay (0–63 VCO cycles) control, supporting high-resolution ADC/DAC clocking in data acquisition systems.
For engineers reviewing the LTC6950IUHH#TRPBF datasheet, LTC6950IUHH#TRPBF pinout, LTC6950IUHH#TRPBF application, or LTC6950IUHH#TRPBF equivalent, key selection criteria include RMS jitter (93fs, 100Hz–62.5MHz), additive jitter (18fsRMS, 12kHz–20MHz), –226dBc/Hz normalized in-band phase noise floor, 1.4GHz VCO input capability, and full PLL lock indicator functionality.
Technical Context
The LTC6950IUHH#TRPBF integrates a complete low-noise PLL core-including programmable R/N dividers, phase/frequency detector (PFD), and low-noise charge pump-with a five-output clock distribution network. Its PFD operates up to 100MHz, and loop bandwidth is configurable (e.g., 12kHz typical), enabling precise jitter filtering for high-speed sampling systems.
Each output supports independent integer division (1–63) and fine-grained VCO-cycle delay (0–63), enabling deterministic skew control across outputs. The fifth output is software-selectable between LVDS (800MHz) and CMOS (250MHz) logic families, with routing options to either VCO or reference divider output-providing flexibility in multi-clock domain synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RMS Jitter | 93fs (integrated 100Hz to 62.5MHz); enables sub-16-bit timing margin in high-speed ADCs |
| Additive Jitter | 18fsRMS (12kHz to 20MHz); critical for minimizing aperture uncertainty in RF sampling |
| VCO Input Freq | Up to 1400MHz; supports direct drive from high-frequency VCSOs or external oscillators |
| Output Count & Type | Four 1.4GHz LVPECL + one LVDS/CMOS-configurable output; meets mixed-signal SoC interface requirements |
| Phase Noise Floor | –226dBc/Hz normalized in-band; ensures ultra-low close-in noise for narrowband receivers |
| Operating Temp | –40°C to 105°C junction; qualified for industrial and base station environments |
| Supply Voltage | 3.15V–3.45V (core supplies); tight regulation minimizes supply-induced jitter |
Pinout & Package
48-lead (5mm × 9mm) plastic QFN package (UHH), exposed pad (Pin 49) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 49) | Ground Reference | Primary analog/digital return; Pin 49 is exposed thermal pad requiring solder connection to PCB ground plane |
| V+, VREF+, VVCO+, VP0+–VP3+ | Supply Inputs | Separate 3.3V supplies for core, reference, VCO, and each PECL output bank-enabling independent noise isolation |
| VCO+, VCO– | Differential VCO Input | Accepts 30MHz–1400MHz differential signal; self-biased at ~2.05V common-mode |
| REF+, REF– | Differential Reference Input | Accepts 2MHz–250MHz reference; internal bias enables single-ended or differential drive |
| PECL0+–PECL3+, PECL0––PECL3– | Differential LVPECL Outputs | Four 1.4GHz outputs with programmable divide/delay; require 50Ω termination to (VPx+ – 2V) |
| LV/CM+, LV/CM– | Configurable Output | Selectable LVDS (800MHz) or CMOS (250MHz); supports VCO- or REF-derived clock paths |
| CP, VCP+ | Charge Pump Interface | 5V-tolerant CP output; 12 current settings (0.25–11.2mA); critical for loop stability and phase noise |
| SCLK, SDI, SDO, CS, SYNC | Serial Control Interface | 4-wire SPI-compatible port with SYNC for multichip edge alignment (EZSync™) |
| STAT1, STAT2 | Status Outputs | Dedicated lock indicators; support real-time PLL status monitoring without host polling |
Key Features
| Feature | Design Value |
|---|---|
| EZSync™ Multichip Synchronization | Hardware SYNC pin enables deterministic sub-100ps edge alignment across multiple LTC6950 devices for coherent array clocking |
| Five Independent Output Dividers | Each of five outputs supports integer division from 1 to 63-allowing simultaneous generation of non-harmonically related clocks |
| Five Independent VCO-Cycle Delays | 0–63 cycle delay per output enables precise inter-output skew tuning down to ~700ps resolution at 1.4GHz |
| Configurable Fifth Output | Software-selectable LVDS or CMOS mode with dual-source routing (VCO or REF)-reducing need for external level translators |
| Full PLL Lock Indicator | Dual STAT pins provide immediate lock/unlock status-eliminating reliance on slow serial register reads during startup or fault recovery |
Applications
| High-Speed Data Acquisition | Communications Baseband Processing |
|---|---|
Use Scenario: Clocking 16-bit+ SAR or pipeline ADCs operating at ≥125MSPS in test equipment or medical imaging systems. IC Role / Device Role / Timing Role: Primary low-jitter clock source and distribution hub; provides synchronized sampling clocks to ADC, FPGA, and memory controller. Use Value: 93fs RMS jitter ensures <0.1 LSB timing error at 16-bit resolution, preserving ENOB in wideband digitization. | Use Scenario: Generating multiple phase-aligned clocks for digital front-end (DFE) processing in 5G massive MIMO radios. IC Role / Device Role / Timing Role: Multi-output clock generator delivering independent I/Q sampling clocks, local oscillator synthesis, and FPGA fabric clocks. Use Value: Sub-100ps inter-output skew enables coherent beamforming across 64+ antenna elements without external deskew ICs. |
| Radar Signal Processing | High-Fidelity Audio DAC Systems |
Use Scenario: Providing time-aligned sampling clocks for pulsed radar receivers with >1GHz IF bandwidth. IC Role / Device Role / Timing Role: Low-phase-noise clock synthesizer feeding ADCs and digital downconverters; supports direct RF sampling architectures. Use Value: –226dBc/Hz normalized in-band phase noise prevents reciprocal mixing degradation in wide-dynamic-range receivers. | Use Scenario: Driving premium audio DACs (e.g., AK4499EX, ESS Sabre) requiring ultra-low-jitter master clocks in studio-grade DACs. IC Role / Device Role / Timing Role: Precision clock distribution device generating 44.1kHz/48kHz multiples and asynchronous sample rate converters. Use Value: 18fsRMS additive jitter (12kHz–20MHz) eliminates audible jitter-induced distortion, preserving >120dB SNR performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-jitter PLL clock distribution applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6957IUH#TRPBF | Higher integration: includes integrated VCO (up to 3.4GHz), eliminating need for external VCSO; same 5-output architecture and EZSync™ capability | Better suited for space-constrained designs where external VCO placement is impractical; requires no VCO matching or loop filter redesign | Select when board area or BOM count reduction outweighs need for maximum VCO frequency flexibility |
| LMK04832RHAT | Two-stage architecture (jitter cleaner + distributor); lower additive jitter (14fsRMS); supports JESD204B SYSREF; different pinout and register map | Preferred for JESD204B-compliant high-speed converter interfaces requiring deterministic latency and SYSREF distribution | Select when JESD204B compliance, ultra-low additive jitter, or dual-loop jitter cleaning are required over pure integer-N simplicity |
Compared with LTC6957IUH#TRPBF, the LTC6950IUHH#TRPBF offers greater VCO frequency flexibility via external VCSO but requires external loop filter design; compared with LMK04832RHAT, it provides simpler integer-N configuration and lower cost, though without JESD204B SYSREF or dual-loop jitter attenuation.
Availability
LTC6950IUHH#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition, 5G baseband processing, radar signal conditioning, and high-fidelity audio DAC systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC6950IUHH#TRPBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, communications, automotive, and healthcare markets.
The LTC6950IUHH#TRPBF belongs to ADI's precision clock generation product line, designed specifically for applications demanding ultra-low phase noise, deterministic skew control, and multichip synchronization in high-speed data conversion and communications infrastructure.
FAQ
What is the maximum VCO input frequency supported by the LTC6950IUHH#TRPBF?
The LTC6950IUHH#TRPBF supports a maximum VCO input frequency of 1400MHz, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows direct interfacing with high-frequency VCSOs or external oscillators without intermediate division, preserving phase noise performance for demanding RF sampling applications.
Does the LTC6950IUHH#TRPBF support deterministic inter-output skew adjustment?
Yes, the LTC6950IUHH#TRPBF supports deterministic skew adjustment: each of its five outputs can be delayed by 0 to 63 VCO clock cycles in integer steps. At 1.4GHz, this provides ~714ps resolution per step, enabling precise alignment of sampling edges across ADCs, FPGAs, or DACs without external delay lines.
How does the LTC6950IUHH#TRPBF achieve its 93fs RMS jitter specification?
The LTC6950IUHH#TRPBF achieves 93fs RMS jitter (100Hz–62.5MHz) through a combination of ultra-low-noise charge pump design, optimized PLL loop bandwidth (e.g., 12kHz typical), and dedicated low-skew LVPECL output drivers. Its –226dBc/Hz normalized in-band phase noise floor and –274dBc/Hz 1/f noise further suppress close-in jitter contributors.
Can the fifth output of the LTC6950IUHH#TRPBF be used as a CMOS clock for microcontrollers?
Yes, the fifth output (LV/CM+, LV/CM–) of the LTC6950IUHH#TRPBF is configurable as a CMOS driver supporting up to 250MHz. When configured in CMOS mode, it delivers rail-to-rail swing into 2.5mA loads, making it directly compatible with standard microcontroller clock inputs without level-shifting circuitry.
What is the purpose of the SYNC pin on the LTC6950IUHH#TRPBF?
The SYNC pin on the LTC6950IUHH#TRPBF enables hardware-triggered multichip synchronization (EZSync™). A synchronous pulse applied to SYNC forces all five outputs across multiple LTC6950IUHH#TRPBF devices to realign their rising edges within <100ps, ensuring deterministic timing across distributed clock domains in large-scale systems.
LTC6950IUHH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock/Frequency Synthesizer, Fanout Buffer (Distribution)
- PLL:
- Yes
- Input:
- Clock
- Output:
- CMOS, LVDS, PECL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:5
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- 1.4GHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 3.15V ~ 5.25V
- Operating Temperature:
- -40°C ~ 105°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (5x9)
LTC6950IUHH#TRPBF FAQ
1.How can I place an order for LTC6950IUHH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6950IUHH#TRPBF 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 LTC6950IUHH#TRPBF reliable?
The price and inventory of LTC6950IUHH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6950IUHH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6950IUHH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6950IUHH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6950IUHH#TRPBF?
LTC6950IUHH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6950IUHH#TRPBF 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 LTC6950IUHH#TRPBF?
For technical support, including LTC6950IUHH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6950IUHH#TRPBF requirements.
6.How does Aetrix verify that LTC6950IUHH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6950IUHH#TRPBF 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 LTC6950IUHH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6950IUHH#TRPBF?
All LTC6950IUHH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6950IUHH#TRPBF, 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 LTC6950IUHH#TRPBF part is unused and in its original packaging.
Return procedure for LTC6950IUHH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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