AD9877ABSZ

Overview

The AD9877ABSZ is a single-supply mixed-signal front end (MxFE) designed for MCNS-DOCSIS, DVB, and DAVIC-compliant set-top box and cable modem applications. It integrates a transmit path with a quadrature digital upconverter, selectable interpolation filter, and a 12-bit direct IF DAC operating at up to 232 MSPS. The receive path features a 12-bit ADC sampling at 33 MSPS and dual 8-bit IQ ADCs at 16.5 MSPS. A built-in direct digital synthesizer supports carrier frequencies up to 65 MHz. The device operates on a 3.3 V supply and is housed in a 100-lead MQFP package.

Feature Summary

• Integrated 12-bit direct IF DAC with programmable sampling rates up to 232 MSPS and analog output level adjustment.
• Receive path includes a 12-bit ADC (33 MSPS) and dual 8-bit IQ ADCs (16.5 MSPS) with undersampling capabilities.
• Quadrature digital upconverter with selectable interpolation filters (12x or 16x) and DDS for carrier generation up to 65 MHz.
• Direct interface capability for AD8321/AD8325 or AD8322/AD8327 PGA cable drivers via the CA port.

Applications

• Cable modems
• Set-top boxes
• Wireless modems

Procurement Notes

Verify that the ordering suffix ABSZ corresponds to the specific package variant and temperature range defined in the manufacturer's current ordering guide. Confirm RoHS compliance status and check for any product change notices affecting pin compatibility or electrical specifications prior to procurement.

Selection Notes

Select this component when a single-chip solution for DOCSIS or DVB applications is required to reduce bill of materials cost. Ensure the system design accommodates the 100-lead MQFP footprint and provides adequate thermal management, as the junction-to-ambient thermal resistance is 40.5°C/W. Verify that the host processor can support the required SPORT serial interface timing.

Part Context

The AD9877 serves as an enhanced replacement for the AD9873, offering improved receive path undersampling performance at a lower cost while maintaining pin compatibility. It consolidates multiple discrete RF and data conversion functions into a single CMOS device, simplifying the design of compliant multimedia gateways.

Replacement Considerations

The AD9873 is a pin-compatible alternative within the same family. When substituting, verify that the specific performance requirements for receive path undersampling align with the target device's specifications.