AFE1302Y/250

Analog Front End (AFE) Overview

The AFE1302Y/250 is an ADSL analog front-end integrated circuit designed for downstream data rates of 4Mbps and higher. It integrates transmit (TX) and receive (RX) channels, VCXO circuitry, and a DAC to connect an ADSL DSP to external line drivers and filters. The device operates on a single 5V analog supply and a 3.3V to 5V digital supply, dissipating 570mW. Key electrical parameters include a noise floor of –144dBm/Hz, a word rate range of 1.1M to 8.8MWords/s, and a clock rate of 35.328MHz. The RX channel features a 16-bit delta-sigma ADC with a PGA, while the TX channel includes a 16-bit delta-sigma DAC.

Analog Front End (AFE) Feature Summary

• Integrated ADSL analog front-end with TX/RX channels and VCXO control
• 16-bit delta-sigma DAC and ADC with programmable gain and attenuation
• Multirate compatible operation from 1.1M to 8.8MWords/s at 35.328MHz clock
• Low power consumption of 570mW with single 5V analog supply

Analog Front End (AFE) Applications

• ADSL-compliant system designs
• Customer Premises Equipment (CPE)
• DSL modems requiring downstream data rates of 4Mbps and higher

Analog Front End (AFE) Procurement Notes

The AFE1302Y/250 is listed as obsolete in Texas Instruments product databases. Verification of current availability requires direct contact with the manufacturer or authorized distributors, as new design recommendations are not provided. Ensure compliance with RoHS standards if applicable to the specific revision.

Analog Front End (AFE) Selection Notes

Select this component for legacy ADSL designs requiring an integrated analog front-end. It supports scalable timing where internal filters change frequency with the clock speed. External filtering and transformers are required to meet noise masks and impedance matching. Verify that the system can accommodate the TQFP-48 package and the specified 0°C to +70°C operating temperature range.

Analog Front End (AFE) Part Context

The AFE1302Y/250 belongs to the AFE1302 series of ADSL analog front-ends from Texas Instruments. The '/250' suffix indicates the device is supplied in a tape and reel format. This part replaces older discrete solutions by integrating the active analog circuitry needed for ADSL signal processing into a single chip.

Analog Front End (AFE) Replacement Considerations

Texas Instruments lists the AFE1302Y/250 as obsolete. No direct public substitute part numbers are confirmed in the source material. Designers should consult TI for alternative components or reference designs suitable for modern ADSL implementations.