AFE1230E

Analog Front End (AFE) Overview

The AFE1230E is a G.SHDSL analog front-end integrated circuit manufactured by Texas Instruments, housed in an SSOP-28 package. It operates within a temperature range of –40°C to +85°C and supports data rates from 64kbps to 2.5Mbps. The device integrates a transmitter with a 16-bit delta-sigma DAC and a receiver with a 16-bit delta-sigma ADC. It functions on a single 5V analog supply and a 3.3V to 5V digital supply. Typical power dissipation is 750mW at E1 rates for G.SHDSL operation.

Analog Front End (AFE) Feature Summary

• Complies with G.SHDSL and HDSL2 standards, supporting E1, T1, and subrate operations.
• Integrates 16-bit delta-sigma converters with on-chip driver and programmable gain amplifier (PGA).
• Features programmable transmit and receive digital filters (fifth or seventh order).
• Provides up to 14.5dBm output power into a 135Ω line via the internal driver.

Analog Front End (AFE) Applications

• G.SHDSL transceiver designs requiring reduced size and cost.
• HDSL2 applications utilizing an external line driver such as the OPA2677.
• Digital Signal Processor (DSP) based line interface solutions.

Analog Front End (AFE) Procurement Notes

Verify the specific ordering suffix when purchasing. The standard part number AFE1230E is available in rail packaging. The variant AFE1230E/1K is exclusively available in tape and reel format, ordered in increments of 1000 units. Confirm package type and quantity requirements prior to ordering.

Analog Front End (AFE) Selection Notes

Select the AFE1230E for direct G.SHDSL integration where the internal driver provides sufficient power. For HDSL2 applications requiring higher output power (up to 17dBm), pair the device with an external driver like the OPA2677. Ensure the host DSP can generate the required serial interface signals, including MCLK, txBaud, and rxBaud.

Analog Front End (AFE) Part Context

The AFE1230E belongs to the AFE1230 family of analog front-ends designed for DSL applications. It serves as a bridge between the digital domain and the telephone line, handling both transmission and reception. The 'E' suffix denotes the commercial temperature range extension (-40°C to +85°C) compared to industrial variants.

Analog Front End (AFE) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Texas Instruments for current product recommendations if the AFE1230E is discontinued or unavailable.

Analog Front End (AFE) FAQ

What is the maximum master clock frequency for the AFE1230E?

The master clock (MCLK) can vary from 1.28MHz to 40.8MHz, with 37.12MHz typically used for E1 rates.

How does the AFE1230E handle echo cancellation?

It performs first-order analog echo cancellation by summing signals from the line and hybrid paths using an input amplifier with differential summer junctions.

Can the AFE1230E operate with a 3.3V analog supply?

No, the device requires a 5V analog power supply (AVDD). The digital supply (DVDD) can be 3.3V or 5V.