LTC6954IUFF-1#PBF Analog Devices Integrated Circuit (Quad Flat No-Lead) In Stock
The LTC6954IUFF-1#PBF is a low phase noise triple-output clock distribution divider and driver with three LVPECL outputs and Schmitt trigger input. Delivers ultralow additive phase noise for high-performance ADC and DAC clocking. Available in 36-pin QFN package with worldwide stock and shipping.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 36
- Lifecycle
- OBSOLETE
- Datasheet
- LTC6954IUFF-1#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $10.2300(MOQ 1)
- Temp Range
- -40.0°C to 105.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LTC6954IUFF-1#PBF?
- Triple LVPECL outputs with ultralow additive phase noise for high-speed ADC and DAC clock distribution
- Programmable dividers on each output channel allow independent frequency division from a single master clock
- Schmitt trigger input accepts a wide range of clock signal amplitudes and waveshapes without external conditioning
- 36-pin QFN package minimizes clock trace lengths for reduced jitter in dense mixed-signal PCB layouts
What is LTC6954IUFF-1#PBF used for?
The LTC6954IUFF-1#PBF is designed for high-speed data converter clock distribution in software-defined radio, phased-array radar, and test and measurement systems where ultralow phase noise is critical for ADC spurious-free dynamic range and SNR performance. It distributes a single low-noise reference clock to three independent LVPECL outputs with programmable division ratios, enabling synchronous clocking of multiple ADCs, DACs, or FPGAs at different sample rates from one master oscillator. High-channel-count data acquisition systems and digital beamforming receivers particularly benefit from its matched output skew and low additive jitter.
What are the specifications of LTC6954IUFF-1#PBF?
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1863 |
| YTEOL | 0 |
| Family | LTC6954 |
| Input Conditioning | SCHMITT TRIGGER |
| JESD-30 Code | R-PQCC-N36 |
| JESD-609 Code | e3 |
| Load Capacitance (CL) | 10pF |
| Logic IC Type | CLOCK DRIVER/DIVIDER |
| Number of Functions | 3 |
| Number of Inverted Outputs | 3 |
| Number of True Outputs | 3 |
| Output Characteristics | 3-STATE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC36,.16X.28,20 |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Power Supply Current-Max (ICC) | 350mA |
| Prop. Delay@Nom-Sup | 0.55ns |
| Propagation Delay (tpd) | 0.55ns |
| Same Edge Skew-Max (tskwd) | 0.12ns |
| Supply Voltage-Max (Vsup) | 3.45V |
| Supply Voltage-Min (Vsup) | 3.15V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| fmax-Min | 1800MHz |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the LTC6954IUFF-1#PBF datasheet?
LTC6954IUFF-1#PBF Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LTC6954IUFF-1#PBF?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What additive phase noise performance does the LTC6954IUFF-1#PBF offer, and why does that matter for wideband ADC clocking?
The LTC6954IUFF-1#PBF adds typically –163 dBc/Hz of additive phase noise floor at 100 MHz output frequency, which is essential for maintaining SNR in high-speed ADCs sampling at 250 MSPS or faster. At 1 GHz ADC sampling, 1 ps of RMS clock jitter degrades SNR by approximately 1.6 dB at the Nyquist frequency; the LTC6954's sub-100 fs additive jitter contribution preserves the 14-bit to 16-bit ADC dynamic range that radar and communications receivers demand.
How do the programmable dividers on the LTC6954IUFF-1#PBF's three LVPECL outputs simplify multi-rate clock distribution?
Each of the three output channels has an independent integer divider that can be set from 1 to 63, allowing a 1 GHz master clock to simultaneously produce 1 GHz, 500 MHz, and 250 MHz outputs for an ADC, DAC, and FPGA fabric clock respectively. This eliminates the need for separate clock buffers or additional PLLs on the board, reducing BOM by 2 to 4 components and lowering total clock distribution jitter by avoiding extra buffer stages each adding 50 fs to 100 fs of jitter.
For a phased-array radar with 8 ADC channels, how does the LTC6954IUFF-1#PBF's matched LVPECL output skew maintain channel coherence?
The LTC6954IUFF-1#PBF specifies output-to-output skew of typically 10 ps between its 3 LVPECL outputs at 10 pF load. In a phased-array system where multiple LTC6954 devices share a common reference clock and SYNC signal, the inter-chip skew across 8 ADC clock paths is bounded to under 50 ps, corresponding to less than 5° of phase error at 100 MHz IF—well within the 1° to 2° coherence budget for high-resolution beamforming.
How does the Schmitt trigger input of the LTC6954IUFF-1#PBF broaden the range of compatible reference clock sources?
The Schmitt trigger input accepts reference clocks with slow rise times up to 10 ns and input amplitudes ranging from 0.2 V to 1.2 V differential, unlike standard CML inputs that require fast edges and precise 100 mV to 400 mV swings. This allows direct connection to TCXO or OCXO oscillators with LVCMOS or LVDS outputs without external level-shifting circuits, reducing clock input conditioning BOM by 1 to 2 components per board.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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