HDSL (High Speed Digital Subscriber Line) is a transmission scheme that fills the gap between ISDN and T1/E1. It is used in a variety of applications, including T1/E1 links, wireless base stations and Internet access.
This document outlines a solution for High Speed Digital Subscriber Line (HDSL) applications using low cost and low power components. It details the modulation method (2B1Q) and power constraints for line-powered remote modems. The text identifies specific Analog Devices chipsets and operational amplifiers, such as the AD812, OP467, AD8042, and AD8044, suitable for driving transformers and filtering signals in single supply configurations. It also discusses ADC options like the AD9221 and AD9223 for digitizing received PAM signals.
| AD812 Bandwidth | 145 MHz |
|---|---|
| OP467 Bandwidth | 28 MHz |
| AD8042 Power Consumption | 5.2 mA/A |
| AD8044 Power Consumption | 3.25 mA/A |
| AD7892 Resolution | 12 bit |
| AD9221 Sample Rate | 1.25 MSPS |
| AD9221 Power Consumption | 50 mW |
| AD9223 Sample Rate | 3 MSPS |
| AD9223 Power Consumption | 100 mW |
Data transmitted on HDSL lines are coded with 2B1Q (2 Bits 1 Quaternary) coding.
The wide bandwidth, low power AD8042 and AD8044 op amps are well suited for this application.
The AD9221 is a 12-bit, 1.25 MSPS ADC.