![Additive Phase Noise vs Offset Frequency, fIN = 622.08MHz, Mx[5:0] = 4, fOUTx = 155.52MHz](https://www.analog.com/-/media/analog/en/products/image/ltc/ltc6954-34082.png?imgver=1&h=500)
![Additive Phase Noise vs Offset Frequency, fIN = 622.08MHz, Mx[5:0] = 4, fOUTx = 155.52MHz](https://www.analog.com/-/media/analog/en/products/image/ltc/ltc6954-34082.png?imgver=1&h=270)
Alternative Parts
Overview
Features and Benefits
- Low Noise Clock Distribution: Suitable for High Speed/High Resolution ADC Clocking
- Additive Jitter < 20fsRMS (12kHz to 20MHz)
- Additive Jitter < 85fsRMS (10Hz to Nyquist)
- 1.8GHz Maximum Input Frequency (LTC6954-1 When DELAY = 0)
- 1.4GHz Maximum Input Frequency (LTC6954-1 When DELAY > 0, LTC6954-2, -3, -4)
- EZSync™ Clock Synchronization Compatible
- Three Independent, Low Noise Outputs
- Four Output Combinations Available
- Three Independent Programmable Dividers Covering All Integers From 1 to 63
- Three Independent Programmable Delays Covering All Integers From 0 to 63
- –40°C to 105°C Junction Temperature Range
Product Details
The LTC6954 is a family of very low phase noise clock distribution parts. Each part has three outputs and each output has an individually programmable frequency divider and delay. There are four members of the family, differing in their output logic signal type:
LTC6954-1: Three LVPECL outputs
LTC6954-2: Two LVPECL and one LVDS/CMOS outputs
LTC6954-3: One LVPECL and two LVDS/CMOS outputs
LTC6954-4: Three LVDS/CMOS outputs
Each output is individually programmable to divide the input frequency by any integer from 1 to 63, and to delay each output by 0 to 63 input clock cycles. The output duty cycle is always 50%, regardless of the divide number. The LVDS/CMOS outputs are jumper selectable via the OUTxSEL pins to provide either an LVDS logic output or a CMOS logic output.
The LTC6954 also features Linear Technology’s EZSync system for perfect clock synchronization and alignment every time.
All device settings are controlled through an SPI-compatible serial port.
Applications
- Clocking High Speed, High Resolution ADCs, DACs and Data Acquisition Systems
- Low Jitter Clock Distribution
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (4)
Documentation & Resources
-
R565 Reliability Data3/23/2018PDF53 K
-
DC1954A - Demo Manual11/11/2015PDF2M
-
Ultralow Jitter Clock Generators and Distributors Maximize Data Converter SNR3/4/2016PDF969K
-
Less than 20fsRMS Additive Jitter Clock Distribution Solution with EZSync11/9/2015PDF820K
Software & Systems Requirements
Evaluation Software
LTC6954 GUI
LTC6954_GUI is used to communicate with the LTC6954 clock driver. It uses the DC590 to translate between USB and SPI-compatible serial communications formats.
Tools & Simulations
Linduino
Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.
Linduino code repository on GitHub and instructions on how to use the code.
IBIS Models
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC6954IUFF-1#PBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-1#TRPBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-2#PBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-2#TRPBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-3#PBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-3#TRPBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-4#PBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| LTC6954IUFF-4#TRPBF | Material Declaration | Reliability Data | 36-Lead QFN (4mm x 7mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R565 Reliability Data |
PCN-PDN Information
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Support & Discussions
LTC6954 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.