AD809BR-REEL7

Overview

The AD809BR-REEL7 is a frequency synthesizer from Analog Devices designed to generate a 155.52 MHz clock signal. It accepts reference inputs of either 19.44 MHz or 9.72 MHz via an integrated multiplexer, supporting TTL, CMOS, ECL, and PECL logic levels. The device performs integer-N synthesis by locking to 8× or 16× the input frequency. Key electrical specifications include a maximum output jitter of 2.9 degrees RMS, a power supply range of 4.5 V to 5.5 V, and a typical operating current of 17 mA (90 mW). It operates within a temperature range of –40°C to +85°C and is housed in a 16-pin narrow SOIC package.

Feature Summary

• Generates 155.52 MHz output from 19.44 MHz (×8) or 9.72 MHz (×16) references
• Integrated input multiplexer for TTL/CMOS or PECL/ECL signals
• Low output jitter with a maximum specification of 2.9 degrees RMS
• Single-supply operation at +5 V or –5.2 V with 90 mW power consumption

Applications

• SONET/SDH systems requiring 155.52 Mbps bit clocks
• Fiber in the Loop network timing architectures
• Distributed timing backplanes using 19.44 MHz or 9.72 MHz references

Procurement Notes

Verify the ordering suffix REEL7 corresponds to the 7-inch reel packaging containing 750 pieces as defined in the manufacturer's ordering guide. Confirm that the BR suffix indicates the industrial temperature range of –40°C to +85°C. Ensure compatibility with the 16-pin narrow SOIC physical footprint during procurement planning.

Selection Notes

Select this component when a fixed 155.52 MHz clock is required from lower-frequency references without external components. The internal VCO eliminates the need for external oscillators. Designers must account for loop dynamics by selecting an appropriate damping factor capacitor value between pins 7 and 8 to control jitter transfer peaking.

Part Context

This part belongs to the AD809 family of frequency synthesizers. The AD809BR variant specifies the industrial temperature grade, while the standard AD809 may cover different ranges. The REEL7 designation specifically identifies the tape-and-reel packaging format used for automated surface-mount assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.