AD9876ABST

Overview

The AD9876ABST is a single-supply broadband modem mixed-signal front end (MxFE) IC from Analog Devices, housed in a 48-lead LQFP package. It integrates a transmit path with a 12-bit DAC and a receive path with a 12-bit ADC, supporting industrial temperature ranges of –40°C to +85°C. The device features a programmable interpolation filter for the transmitter and a low-pass filter with selectable cutoff frequencies for the receiver. An on-chip PLL generates necessary clocks from a single crystal or input, while a voltage regulator controller supports external linear regulation.

Feature Summary

• Integrated 12-bit TxDAC+ with selectable 2× or 4× interpolation filters
• 12-bit pipeline ADC with programmable gain amplifier (–6 dB to +36 dB)
• Internal PLL clock multiplier generating clocks from OSCIN
• Voltage Regulator Controller (VRC) for external 1.3 V linear regulation

Applications

• xDSL systems
• Broadband wireless infrastructure
• Powerline networking equipment
• Home phone networking devices

Procurement Notes

Verify the specific suffix 'ABST' against the manufacturer's current ordering guide to confirm availability and exact thermal grade specifications. The component operates within the industrial temperature range and requires proper ESD handling during installation due to its sensitivity to electrostatic discharge.

Selection Notes

Select this model for applications requiring integrated analog-to-digital and digital-to-analog conversion in a single supply environment. Ensure the system design accommodates the 48-lead LQFP footprint and provides appropriate decoupling for the analog and digital supply pins as specified in the datasheet layout guidelines.

Part Context

This component belongs to the AD9876 MxFE family, which is pin-compatible with the 10-bit AD9875 variant. Both parts share the same 48-lead LQFP package form factor, allowing for potential design flexibility between different resolution requirements within the same broadband modem application space.

Replacement Considerations

The AD9875 is a pin-compatible alternative offering 10-bit resolution instead of 12-bit. Verify if the reduced resolution meets the dynamic performance requirements of the specific application before substituting.