Datasheet AD8018 (Analog Devices)

a
5 V, Rail-to-Rail, High-Output Current, xDSL Line Drive Amplifier AD8018 FEATURES PIN CONFIGURATIONS Ideal xDSL Line Drive Amplifier for USB, PCMCIA, or PCI-Based Customer Premise Equipment (CPE). The 8-Lead SOIC 14-Lead TSSOP AD8018 provides maximum reach on 5 V supply, (Thermal Coastline) driving 16 dBm of power into a back-terminated, AD8018ARU NC 1 14 NC transformer-coupled 100
⍀
while maintaining –82 dBc AD8018AR 1 8 OUT1
ⴙ
V 2 13
ⴙ
V of out-of-band SFDR. S OUT1 S Rail-to-Rail Output Voltage and High Output Current –IN1 3 12 2 7 OUT2 OUT2 –IN1 Drive
ⴙ
IN1 4 11 –IN2 3 6 –IN2
ⴙ
IN1 400 mA Output Current into Differential Load of 10
⍀
–V 5 10
ⴙ
IN2 S @ 8 V p-p 4 5 –V
ⴙ
IN2 PWDN1 6 9 PWDN0 S Low Single-Tone Distortion NC 7 8 DGND –86 dBc Worst Harmonic, 6 V p-p into Differential 10
⍀
NC = NO CONNECT @ 100 kHz PRODUCT DESCRIPTION Low Noise
The AD8018 is intended for use in single-supply (5 V) xDSL
4.5 nV/
√
Hz Voltage Noise Density, 100 kHz
modems where high-output current and low distortion are
Out-of-Band SFDR = –82 dBc, 144 kHz to 500 kHz,
essential to achieve maximum reach. The dual high-speed
RLOAD = 12.5
⍀
, PLINE = 13 dBm
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 mA
3.3 V to 8 V Power Supply Range
of current into 10 Ω (differential) while maintaining –82 dBc
Two Logic Bits for Standby and Shutdown
out-of-band SFDR. The AD8018 is available with flexible standby
Low Supply Current of 9 mA/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
130 MHz Bandwidth (–3 dB)
shutdown (outputs high impedance).
300 V/
␮
s Slew Rate
Fabricated with ADI’s high-speed XFCB (eXtra Fast Comple-
APPLICATIONS
mentary Bipolar) process, the high bandwidth and fast slew rate
xDSL 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 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-
–30
current drive in small packages make the AD8018 ideal for use in
N = 4.0
low-cost USB, PCMCIA, and PCI Customer Premise Equipment
–40
for ADSL, SDSL, VDSL, and proprietary xDSL systems. Both
VS = 5V
models will operate over the temperature range –40°C to +85°C.
–50 VS = 3.3V 5V 1nF dBc 0.01
␮
F – 100
⍀
–60 10
⍀
V SFDR S = 8V 10k
⍀
R1 10k
⍀
3.1
⍀
–70 RL = 100
⍀
750
⍀
V P IN V LINE- REF 750
⍀
OUT 16dBm 0.01
␮
F POWER 750
⍀
–80 13dBm R2 10k
⍀
3.1
⍀
1:4 –90 10
⍀
TRANSFORMER 4 6 8 10 12 14 16 18 0.01
␮
F 100
⍀
10k
⍀
PLINE – dBm 1nF
Figure 1. Out-of-Band SFDR vs. ADSL Upstream Line Power; V Figure 2. Single-Supply Voltage Differential Drive Circuit S = 5 V, N = 4 Turns, 144 kHz to 500 kHz. See Evaluation Board Schematics in Figure 11. for xDSL Applications REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its
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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
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