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Ultralow jitter clock generation (4.5GHz) and clock distribution (7.5GHz) family

07 August 2018

Analog Devices have announced the LTC6952, LTC6953, LTC6955 and LTC6955-1 family of low jitter, high performance clock generation and distribution devices supporting JESD204B subclass 1 clocking applications up to 7.5GHz.

These products are ideal for high speed data converter clocking applications, with a scalable architecture to provide thousands of synchronised low jitter clocks, each with a complementary SYSREF signal.

- LTC6952: ultralow jitter, 4.5GHz PLL with 11 outputs and JESD204B support
- LTC6953: ultralow jitter, 4.5GHz clock distributor with 11 outputs and JESD204B support
- LTC6955: ultralow jitter, 7.5GHz, 11 output fanout buffer
- LTC6955-1: LTC6955 with additional ÷2 on one output

The LTC6952 is a high performance, ultralow jitter, JESD204B clock generation and distribution device. It includes a phase locked loop (PLL) core, consisting of a reference divider, phase-frequency detector (PFD) with a phase-lock indicator, ultralow noise charge pump and integer feedback divider.

The LTC6952’s eleven outputs can be configured as up to five JESD204B subclass 1 device clock/SYSREF pairs plus one general purpose output, or simply 11 general purpose clock outputs for non-JESD204B applications. Each output has its own individually programmable frequency divider and output driver. All outputs can be synchronised and set to precise phase alignment, using individual coarse half-cycle digital delays and fine analogue time delays.

For applications requiring more than eleven total outputs, multiple LTC6952s can be connected using the EZSync™ or ParallelSync™ synchronisation protocols.

The LTC6953 is the clock distribution function of the LTC6952. The LTC6955 is an 11 output fanout buffer with a parallel interface that selects one of three states per output group: in-phase, 180° out of phase, or power-down. The LTC6955-1 is the same as the LTC6955-1 except one output has an integrated ÷2.

- View the product pages, download data sheet, order samples and evaluation boards on Analog.com:

- LTC6952: www.analog.com/ltc6952
- LTC6953: www.analog.com/ltc6953
- LTC6955: www.analog.com/ltc6955
- LTC6955-1: www.analog.com/ltc6955-1

All devices are offered in a 52-lead, 7 mm × 8 mm plastic QFN package. The device is rated for operation from -40°C to 125°C junction temperature. Unused outputs can be powered down when not in use. Samples and evaluation board of all products are available immediately. Production quantities of all products will be available by the end of June.

The LTC6952 and LTC6955-1 will be demonstrated at IMS 2018, booth 1725, on the 12th to 14th of June in Philadelphia. The demo will show a scalable architecture for thousands of outputs.

Summary of Features: LTC6952/LTC6953/LTC6955/LTC6955-1-1

- LTC6952
- JESD204B Subclass 1 SYSREF Signal Generation
- Low Noise Integer-N PLL
- Max. RF Frequency: 4.5GHz
- Normalised In-Band Phase Noise Floor: -229dBc/Hz
- Normalised In-Band 1/f Noise: -281dBc/Hz
- Eleven Independent, Low Noise Outputs with Programmable Coarse Digital & Fine Analogue Delays
- Additive Output Jitter: <6fsRMS (12kHz – 20MHz; 4.5GHz)
- Additive Output Jitter: 65fsRMS (ADC SNR Method)

- LTC6953
- JESD204B Subclass 1 SYSREF Signal Generation
- Max. RF Frequency: 4.5GHz
- Eleven Independent, Low Noise Outputs with Programmable Coarse Digital & Fine Analogue Delays
- Additive Output Jitter: <6fsRMS (12kHz – 20MHz; 4.5GHz)
- Additive Output Jitter: 65fsRMS (ADC SNR Method).

- LTC6955/LTC6955-1
- Max. RF Frequency: 7.5GHz
- Eleven Ultralow Noise CML Outputs
- Parallel Control for Multiple Output Configurations
- LTC6955: 11 Output Buffer
- LTC6955-1: 10 Buffered Outputs & One ÷2 Output

Pricing & Availability

Product
Production
Availability
Price Each per 1,000
Package
LTC6952
May 2018
Starts at $12.50
52-Lead, 7mm × 8mm Plastic QFN
LTC6953
May 2018
Starts at $10.00
52-Lead, 7mm × 8mm Plastic QFN
LTC6955
June 2018
Starts at $8.00
52-Lead, 7mm × 8mm Plastic QFN
LTC6955-1
June 2018
Starts at $8.00
52-Lead, 7mm × 8mm Plastic QFN


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