AFE2124E

Analog Front End (AFE) Overview

The AFE2124E is a dual HDSL/SDSL Analog Front End manufactured by Texas Instruments (originally Burr-Brown). It integrates two complete analog interfaces for E1, T1, and SDSL operation within a single 48-lead SSOP package. The device supports scalable data rates from 64kbps to 1168kbps, with internal filters and pulse formers automatically adjusting to the clock frequency. Each channel features a transmit section generating 2B1Q symbols via a differential line driver and a receive section utilizing a fourth-order delta-sigma ADC. It operates on a +5V analog supply and a +3.3V to +5V digital supply, dissipating approximately 250mW per channel at E1 rates.

Analog Front End (AFE) Feature Summary

• Dual integrated HDSL/SDSL analog front ends supporting E1, T1, and SDSL standards
• Scalable data rate operation from 64kbps to 1168kbps with auto-scaling filters
• Integrated 14-bit delta-sigma ADC with programmable gain amplifier (0dB to +12dB)
• Differential line driver providing up to 13.5dBm output power
• First-order echo cancellation via external compromise hybrid interface

Analog Front End (AFE) Applications

• HDSL (High bit-rate Digital Subscriber Line) systems
• SDSL (Symmetrical Digital Subscriber Line) equipment
• E1 and T1 telecommunication transmission interfaces
• Digital Subscriber Line Access Multiplexers (DSLAMs)

Analog Front End (AFE) Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix (e.g., standard rail vs. tape and reel /1K) matches the required packaging format. Check for RoHS compliance status as indicated in current documentation. Ensure the source provides valid traceability for this legacy active component.

Analog Front End (AFE) Selection Notes

Select the AFE2124E for designs requiring dual-channel HDSL/SDSL connectivity with minimal external component count. Ensure the system design accommodates separate +5V analog and +3.3V/+5V digital supplies. Verify that the host DSP can generate the required 48x oversampling clocks (up to 28.032MHz) and manage the six-wire serial interface timing constraints.

Analog Front End (AFE) Part Context

The AFE2124E belongs to the Burr-Brown family of analog front ends, now part of Texas Instruments' portfolio. It is functionally equivalent to two AFE1124 units combined in one package. This integration reduces board space and cost compared to using discrete solutions or single-channel AFEs for dual-line applications.

Analog Front End (AFE) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Texas Instruments for current alternative recommendations if discontinuation occurs.