Ultralow Power, Adaptive Linear Power,

Dual-Port ADSL/ADSL2+ Line Driver

Data Sheet

ADLD8403

FEATURES

2 differential DSL channels comprising current feedback,

high output current amplifiers with integrated feedback

resistors plus biasing network

Ideal for use as ADSL/ADSL2+ dual-channel central office

(CO) line drivers

Low power consumption using Class H technology

Single 12.5 V supply operation

20.4 dBm line power, 1:1 transformer

Less than 600 mW per channel total power dissipation

while driving 20.4 dBm (includes 110 mW line power)

Less than 275 mW per channel total power dissipation

while driving 14.5 dBm (including line power)

High output voltage and current drive

43.4 V differential output voltage swing

Low distortion

−65 dBc typical multitone power ratio (MTPR) at 20.4 dBm,

26 kHz to 2.2 MHz

Low cost protection components enable ITU-T-K20 and

GR-1089 compliance

APPLICATIONS

ADSL/ADSL2+ CO line drivers

INTERNAL SCHEMATIC

VEEP

VCCP

VCC

VOPA

VONA

INPA

VCOM_A

INNA

VCC

4kΩ

4kΩ

Figure 1. Channel A Internal Schematic

GENERAL DESCRIPTION

The ADLD8403 comprises two differential, high output current,

low power consumption operational amplifiers. It is particularly

well suited for the CO driver interface in digital subscriber line

systems, such as ADSL and ADSL2+. The driver can deliver

20.4 dBm to a line while compensating for losses due to hybrid

insertion and back termination resistors. The ADLD8403 uses

the Analog Devices, Inc., second generation Adaptive Linear

Power™ (Class H) architecture to achieve unprecedented power

efficiency using a single power supply. Additional functionality

allows the shutdown of pumps for enhanced power savings for

line powers of less than 14.5 dBm. This functionality yields the

smallest printed circuit board (PCB) footprint and lowest total

cost of ownership.

The low power consumption, high output current, high

output voltage swing, and robust thermal packaging enable

the ADLD8403 to be the CO line driver in ADSL and other

xDSL systems.

The ADLD8403 is available in a 4 mm × 4 mm, 20-lead LFCSP.

18

–6

–2

2

6

10

14

0

10

9

8

7

6

5

4

3

2

1

TIME (µs)

VOPA

VONA

VOPB

VONB

VCCP

VEEP

Figure 2. Outputs and Pumps Time Domain Response, Typical ADSL/ADSL2+

Rev. C

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