AD8018 Analog Devices, AD8018 Datasheet

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AD8018

Manufacturer Part Number
AD8018
Description
Dual +5V, High Output Current, xDSL Line Drive Amplifiers
Manufacturer
Analog Devices
Datasheet

Specifications of AD8018

Vcc-vee
3.3V to 8V
Isy Per Amplifier
10mA
Packages
SOIC,SOP
-3db Bandwidth
130MHz
Slew Rate
300V/µs
Vos
1mV
Ib
1µA
# Opamps Per Pkg
2
Input Noise (nv/rthz)
4.5nV/rtHz

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a
–30
–40
–50
–60
–70
–80
–90
4
Hz
V
6
S
= 3.3V
8
P
10
LINE
V
– dBm
S
= 5V
12
14
V
S
= 8V
N = 4.0
16
18
5 V, Rail-to-Rail, High-Output Current,
PRODUCT DESCRIPTION
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
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 ADI’s 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 –40 C to +85 C.
OUT1
–IN1
–V
IN1
(Thermal Coastline)
S
V
0.01 F
0.01 F
IN
1
2
3
4
8-Lead SOIC
AD8018AR
10k
10k
0.01 F
xDSL Line Drive Amplifier
100
V
100
REF
PIN CONFIGURATIONS
750
(differential) while maintaining –82 dBc
8
7
6
5
5V
OUT2
–IN2
750
750
V
1nF
IN2
S
10
10
1nF
10k
PWDN1
10k
P
16dBm
OUT1
–IN1
OUT
–V
IN1
NC
NC
S
3.1
3.1
TRANSFORMER
R1
R2
1
2
3
4
5
6
7
14-Lead TSSOP
NC = NO CONNECT
1:4
AD8018ARU
AD8018
R
L
= 100
LINE-
POWER
13dBm
14
13
11
10
12
9
8
PWDN0
DGND
NC
OUT2
–IN2
V
IN2
S

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AD8018 Summary of contents

Page 1

... 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). ...

Page 2

... AD8018–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth 0.1 dB Bandwidth Large Signal Bandwidth Slew Rate Rise and Fall Time Settling Time NOISE/HARMONIC PERFORMANCE Distortion, Second Harmonic Third Harmonic MTPR (In-Band) SFDR (Out-of-Band) Input Noise Voltage Input Noise Current Crosstalk DC PERFORMANCE Input Offset Voltage ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8018 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... AD8018 –Typical Performance Characteristics 750 750 0.1 F AD8018 0 SIGNAL – 150 100 50 0 –50 –100 –150 100 150 200 250 300 0 50 TIME – –1 –2 –3 100 150 200 250 300 0 50 TIME – ns 1000 ...

Page 5

... 2.5V – 100 L –70 100M 100k AD8018 2. 100k 1M 10M 100M 1G FREQUENCY – Hz 750 2.5V STANDBY V S OUT R = 100 (1,0) or (0, (1,1) FULL POWER ...

Page 6

... AD8018 100 1/2 500 AD8018 750 6V VSIG 500 IN 220 F 0.1 F AD8138 500 50 R 500 25 6V 750 AD8018 500 1/2 100 –60 –70 –80 3RD HARMONIC –90 2ND HARMONIC –100 –110 0.01 0.1 FREQUENCY – MHz – 2. – 100kHz ...

Page 7

... TRANSFORMER TURNS RATIO – 4.6 4.8 3.0 3.2 10M = 100 LINE 100k 10k 1k 100 10 1 0.1 0. 100 18 DECREASING 0.86 0.88 AD8018 3.3 S 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 TRANSFORMER TURNS RATIO PHASE TRANSIMPEDANCE 10k 100k 1M 10M 100M 1G FREQUENCY – Hz LOGIC INCREASING LOGIC 0.90 0.92 0.94 0.96 0.98 1 ...

Page 8

... V of either power supply, and maintaining low distortion. A differential line driver using the AD8018 can provide CPE performance on a single 5 V supply. This performance is enabled by Analog Device’s XFCB process and a novel, two- stage current feedback architecture featuring a patent-pending rail-to-rail output stage ...

Page 9

... AD8018 differential driver and provide a well balanced low-distortion input signal. The differential load (R of the AD8018 can be set to the equivalent of the line imped- ance reflected through a transformer. The AD9632 converts the differential output voltage back to a single-ended signal. ...

Page 10

... MAD value is equal to 0.8 times the rms value TOT For the AD8018, operating on a single 5 V supply and deliver- ing a total of 16 dBm (13 dBm to the line and 3 dBm to the matching network) into 12.5 a 1:4.0 transformer plus back termination), the power is: ...

Page 11

... V peak voltage on the 100 that the maximum low-distortion output swing available from the AD8018 line driver supply and, taking into account the power lost due to the termination resistance, a step-up transformer with turns ratio of 4.0 or greater is needed. ...

Page 12

... AD8018 20 0 –20 –40 –60 – FREQUENCY – kHz MTPR versus transformer turns ratio is depicted in TPC 21 and covers a variety of line power ranging from +12 dBm to +14 dBm. As the turns ratio increases, the driver hybrid can deliver more undistorted power due to higher output current capability. ...

Page 13

... DNI TP5 AGND;4 R13 DNI V CC R28 DNI 100 R26 PDN0 U1 100 AD8018 R25 PDN1 DGND NC1 NC2 NC3 0.1 F 0.1 F JP2 C24 C25 AD8018 DNI DNI CAPPOLY CAPPOLY R32 2 9 DNI 8 3 CAPPOLY 1 10 CAPPOLY C7 C6 DNI DNI 1 2 ...

Page 14

... AD8018 ...

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... AD8018 ...

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... AD8018 ...

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... AD8018 ...

Page 18

... Waldom D 2723 -ND 2 3-pin gold male locking header Waldom # WM 2701 -ND 1 AD8018ARU ADSL Driver hybrid 1 AD8018 TSSOP1T Non-Inverting REV. A Evaluation PC board –40 1/4" panhead ss machine screw –40 1/2" threaded alum. standoffs EVALUATION BOARD—BILL OF MATERIALS ...

Page 19

... Dimensions shown in inches and (mm). 14 0.177 (4.50) 0.173 (4.40) 0.0196 (0.50) 0.169 (4.30) 45 0.0099 (0.25) 1 PIN 0.050 (1.27) 0.0256 (0.65) 0.016 (0.40) BSC 0.059 (1.50) 0.093 (1.00) 0.031 (0.80) 0.006 (0.15) 0.002 (0.05) CONTROLLING DIMENSIONS ARE IN MILLIMETERS AD8018 14 Lead TSSOP (RU-14) 0.201 (5.10) 0.197 (5.00) 0.193 (4.90) 8 0.252 (6.40) BSC 7 0.047 (1.2) MAX 8 0.0118 (0.30) 0 0.008 (0.20) SEATING 0.0075 (0.19) PLANE 0.004 (0.09) 0.030 (0.75) ...

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