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AD8018ARUZ Datasheet, PDF (1/19 Pages) Analog Devices – 5 V, Rail-to-Rail, High-Output Current, xDSL Line Drive Amplifier | |||
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5 V, Rail-to-Rail, High-Output Current,
xDSL Line Drive Amplifier
AD8018
FEATURES
Ideal xDSL Line Drive Amplifier for USB, PCMCIA, or
PCI-Based Customer Premise Equipment (CPE). The
AD8018 provides maximum reach on 5 V supply,
driving 16 dBm of power into a back-terminated,
transformer-coupled 100 â while maintaining â82 dBc
of out-of-band SFDR.
Rail-to-Rail Output Voltage and High Output Current
Drive
400 mA Output Current into Differential Load of 10 â
@ 8 V p-p
Low Single-Tone Distortion
â86 dBc Worst Harmonic, 6 V p-p into Differential 10 â
@ 100 kHz
Low Noise
4.5 nV/âHz Voltage Noise Density, 100 kHz
Out-of-Band SFDR = â82 dBc, 144 kHz to 500 kHz,
RLOAD = 12.5 â, PLINE = 13 dBm
Low-Power Operation
3.3 V to 8 V Power Supply Range
Two Logic Bits for Standby and Shutdown
Low Supply Current of 9 mA/Amplifier (Typ)
Current Feedback Amplifiers
High Speed
130 MHz Bandwidth (â3 dB)
300 V/â®s Slew Rate
APPLICATIONS
xDSL USB, PCI, PCMCIA Cards
Consumer DSL Modems
Twisted Pair Line Driver
â30
â40
â50
VS = 3.3V
â60
â70
VS = 5V
N = 4.0
VS = 8V
â80
â90
4
6
8
10
12
14
16
18
PLINE â dBm
Figure 1. Out-of-Band SFDR vs. ADSL Upstream Line Power;
VS = 5 V, N = 4 Turns, 144 kHz to 500 kHz. See Evaluation
Board Schematics in Figure 11.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
PIN CONFIGURATIONS
8-Lead SOIC
(Thermal Coastline)
14-Lead TSSOP
AD8018AR
OUT1 1
8 ØVS
âIN1 2
7 OUT2
ØIN1 3
6 âIN2
âVS 4
5 ØIN2
NC 1
OUT1 2
âIN1 3
ØIN1 4
âVS 5
PWDN1 6
NC 7
AD8018ARU 14 NC
13 ØVS
12 OUT2
11 âIN2
10 ØIN2
9 PWDN0
8 DGND
PRODUCT DESCRIPTION
NC = NO CONNECT
The AD8018 is intended for use in single-supply (5 V) xDSL
modems where high-output current and low distortion are
essential to achieve maximum reach. The dual high-speed
amplifiers are capable of driving low distortion signals to within
0.5 V of the power supply rail. Each amplifier can drive 400 mA
of current into 10 ⦠(differential) while maintaining â82 dBc
out-of-band SFDR. The AD8018 is available with flexible standby
and shutdown modes. Two digital logic bits (PWDN1 and
PWDN0) may be used to put the AD8018 into one of three
modes: full power, standby (outputs low impedance), and
shutdown (outputs high impedance).
Fabricated with ADIâs high-speed XFCB (eXtra Fast Comple-
mentary Bipolar) process, the high bandwidth and fast slew rate
of the AD8018 keep distortion to a minimum, while dissipat-
ing a minimum of power. The quiescent current of the AD8018
is a low 9 mA/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 xDSL systems. Both
models will operate over the temperature range â40°C to +85°C.
0.01â®F 100â
5V
1nF
10â
10kâ
VIN
VREF
0.01â®F
10kâ
0.01â®F 100â
750â
750â
750â
R1
10kâ 3.1â
POUT
16dBm
RL = 100â
LINE-
POWER
13dBm
R2
3.1â
1:4
10â
TRANSFORMER
1nF 10kâ
Figure 2. Single-Supply Voltage Differential Drive Circuit
for xDSL Applications
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
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