DS26503LN+

The Analog Devices DS26503LN+ is a building-integrated timing-supply (BITS) clock-recovery element that also functions as a basic T1/E1 transceiver. It supports T1/J1 and E1 interfaces, including CMI-coded signals, and offers short- and long-haul line interface capabilities. The device can recover clocks from T1, E1, and 6312kHz synchronization timing interfaces, and in T1/E1 modes, it can recover the Synchronization Status Message (SSM).

Key features include a T1/E1 jitter attenuator with bypass mode, fully independent transmit and receive functionality, and internal software-selectable termination for 75Ω, 100Ω, 110Ω, and 120Ω lines. It accepts various master clock inputs, including 16.384MHz, 12.8MHz, 8.192MHz, 4.096MHz, 2.048MHz, and 1.544MHz. Control is managed via a parallel, serial (SPI), or hardware port.

This IC is designed for applications such as BITS timing rate conversion and basic transceiver functions. It provides LOS, AIS, and LOF indications through hardware output pins and features fast transmitter-output disable for protection switching. The device operates at a 3.3V supply with 5V-tolerant inputs and outputs and is housed in a 64-LQFP package, suitable for surface mounting. The operating temperature range is -40°C to +85°C.