AD7011ARS

Overview

The AD7011ARS is a complete low-power CMOS pi/4 DQPSK modulator designed for baseband conversion of I and Q transmit waveforms in accordance with the TIA IS-54 standard. It operates on a single +5 V supply and features two 10-bit D/A converters with fourth-order reconstruction filters. The device includes root-raised cosine Tx filters (alpha = 0.35), differential analog outputs, and on-chip ramp up/down power control. Typical power dissipation is 30 mW, with a power-down mode drawing less than 10 μA. It is housed in a 24-pin SSOP package.

Feature Summary

• Integrates an on-chip pi/4 DQPSK modulator with dual 10-bit digital-to-analog converters
• Supports dual-mode operation including analog bypass and digital modes
• Includes on-chip voltage reference and transmitter offset calibration circuitry
• Features very low power consumption with a dedicated power-down mode

Applications

• American Digital Cellular Telephony systems
• American Analog Cellular Telephony systems
• Baseband processing for TIA IS-54 compliant transmitters

Procurement Notes

Verify that the component matches the specific AD7011ARS designation to ensure compatibility with single +5 V supply requirements and 24-pin SSOP packaging. Confirm that the received units are genuine Analog Devices products by checking markings and documentation against official manufacturer specifications. Ensure handling procedures account for the CMOS technology used in this baseband modulator.

Selection Notes

Select the AD7011ARS when designing baseband sections for TIA IS-54 digital cellular applications requiring integrated pi/4 DQPSK modulation. This component is suitable for designs needing low power dissipation and on-chip filtering without external DACs. Consider the single +5 V supply constraint and the need for differential analog outputs when planning the system architecture.

Part Context

The AD7011 is part of a family of baseband transmit ports developed by Analog Devices for cellular telephony standards. It complements other components like the AD7013 receive port to form complete baseband solutions. The AD7011ARS variant specifically denotes the surface-mount SSOP package version, distinguishing it from other package options within the same functional series.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Analog Devices resources for current equivalent or pin-compatible alternatives.