AD8018 Analog Devices Data Sheet Manual

V, Rail-to-Rail, High-Output Current, x DSL Line Drive Amplifier

AD8018

FEATURES PIN CONFIGURATIONS

Ideal x DSL Line Drive Amplifier for USB, PCMCIA, or

8-Lead SOIC 14-Lead TSSOP

PCI-Based Customer Premise Equipment (CPE). The

(Thermal Coastline)

AD8018 provides maximum reach on 5 V supply, driving 16 d Bm of power into a back-terminated, AD8018ARU

NC NC

transformer-coupled 100
while maintaining –82 d Bc AD8018AR

OUT1 VS VS

of out-of-band SFDR.

–IN1 OUT2

Rail-to-Rail Output Voltage and High Output Current –IN1 OUT2

IN1 –IN2

Drive

IN1 –IN2

m A Output Current into Differential Load of 10 –VS IN2

–VS IN2 PWDN1 PWDN0

Low Single-Tone Distortion NC DGND

–86 d Bc Worst Harmonic, 6 V p-p into Differential 10

NC = NO CONNECT

@ 100 k Hz PRODUCT DESCRIPTION Low Noise The AD8018 is intended for use in single-supply (5 V) x DSL 4.5 n V/√Hz Voltage Noise Density, 100 k Hz modems where high-output current and low distortion are Out-of-Band SFDR = –82 d Bc, 144 k Hz to 500 k Hz, essential to achieve maximum reach. The dual high-speed

RLOAD = 12.5 , PLINE = 13 d Bm amplifiers are capable of driving low distortion signals to within

Low-Power Operation 0.5 V of the power supply rail. Each amplifier can drive 400 m A 3.3 V to 8 V Power Supply Range of current into 10 Ω (differential) while maintaining –82 d Bc Two Logic Bits for Standby and Shutdown out-of-band SFDR. The AD8018 is available with flexible standby Low Supply Current of 9 m A/Amplifier (Typ) and shutdown modes. Two digital logic bits (PWDN1 and Current Feedback Amplifiers PWDN0) may be used to put the AD8018 into one of three High Speed modes: full power, standby (outputs low impedance), and MHz Bandwidth (–3 ww .BDTIC.c d B) shutdown (outputs high impedance). m/ADI V/s Slew Rate

Fabricated with ADI’s high-speed XFCB (e Xtra Fast Comple-

APPLICATIONS mentary Bipolar) process, the high bandwidth and fast slew rate x DSL USB, PCI, PCMCIA Cards of the AD8018 keep distortion to a minimum, while dissipat- Consumer DSL Modems ing a minimum of power. The quiescent current of the AD8018 Twisted Pair Line Driver is a low 9 m A/amplifier. The AD8018 drive capability comes in

compact 8-lead Thermal Coastline SOIC and 14-lead TSSOP packages. Low-distortion, rail-to-rail output voltage, and high-

current drive in small packages make the AD8018 ideal for use in

low-cost USB, PCMCIA, and PCI Customer Premise Equipment

for ADSL, SDSL, VDSL, and proprietary x DSL systems. Both

VS = 5V models will operate over the temperature range –40°C to +85°C.

–50 VS = 3.3V

VS = 8V

–70 RL = 100

750
VIN

VREF POUT LINE- 16d Bm POWER

–80 13d Bm

–90 1:4 TRANSFORMER

PLINE – d Bm 1n F

Figure 1. Out-of-Band SFDR vs. ADSL Upstream Line Power;

VS = 5 V, N = 4 Turns, 144 k Hz to 500 k Hz. See Evaluation Figure 2. Single-Supply Voltage Differential Drive Circuit Board Schematics in Figure 11. for x DSL Applications

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