Analog Devices Inc. AD809BR-REEL7

Description
The AD809 is a 155.52 MHz frequency synthesizer that generates a BCL/PECL output clock from either a 19.44 MHz or a 9.72 MHz TTL/CMOS/ECL/PECL reference frequency. It supports distributed timing architectures, allowing a 19.44 MHz or 9.72 MHz timing reference signal to be distributed to multiple 155.52 Mbps ports. The AD809 can be used to create the transmit bit clock for one or more ports.
An input signal multiplexer supports looptimed applications where a 155.52 MHz transmit bit clock is recovered from the 155.52 Mbps received data.
The AD809 has a low jitter VCO, low power consumption, and wide operating temperature range, making it suitable for generating a 155.52 MHz bit clock for SONET/SDH/Fiber in the Loop systems. It has an onchip VCO that locks to either 8x or 16x the frequency at the 19.44 MHz or 9.72 MHz input. No external components are needed for frequency synthesis, but the user can adjust loop dynamics by selecting a damping factor capacitor.
The AD809 guarantees that the clock output frequency will drift low in the absence of an input signal. It consumes 90 mW and operates from a single power supply at either 5 V or 5.2 V.

Features
Frequency synthesis to 155.52 MHz
19.44 MHz or 9.72 MHz input reference signal select mux
Single supply operation: 5 V or 5.2 V
Output jitter: 2.0 degrees RMS
Low power: 90 mW
10 kHz ECL/PECL compatible output
10 kHz ECL/PECL/TTL/CMOS compatible input
Package: 16pin narrow 150 mil SOIC

Applications
SONET/SDH/Fiber in the Loop systems
Transmit bit clock generation
Looptimed applications