Analog Devices AD8018ARU-REEL7, AD8018ARU-REEL, AD8018ARU, AD8018AR-REEL7, AD8018AR-REEL Datasheet

REV. A

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a

AD8018

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

5 V, Rail-to-Rail, High-Output Current,

xDSL Line Drive Amplifier

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 ⍀ while maintaining –82 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 ⍀

@ 8 V p-p

Low Single-Tone Distortion

–86 dBc Worst Harmonic, 6 V p-p into Differential 10 ⍀
@ 100 kHz

Low Noise

4.5 nV/√Hz Voltage Noise Density, 100 kHz

Out-of-Band SFDR = –82 dBc, 144 kHz to 500 kHz,

R

LOAD

= 12.5 ⍀, P

LINE

= 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 (–3 dB)

300 V/␮s Slew Rate

APPLICATIONS
xDSL USB, PCI, PCMCIA Cards
Consumer DSL Modems
Twisted Pair Line Driver

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 Ω (differential) while maintaining –82 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 ADI’s high-speed XFCB (eXtra Fast Comple­mentary Bipolar) process, the high bandwidth and fast slew rate
of the AD8018 keep distortion to a minimum, while dissipat­ing 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 high­current 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.

10⍀

1nF

5V

750⍀

V

IN

10⍀

1nF

750⍀

750⍀

0.01␮F

0.01␮F

V

REF

0.01␮F

100⍀

100⍀

10k⍀

10k⍀

P

OUT

16dBm

R1

3.1⍀

R2

3.1⍀

RL = 100⍀

LINE­POWER
13dBm

TRANSFORMER

1:4

10k⍀

10k⍀

Figure 2. Single-Supply Voltage Differential Drive Circuit
for xDSL Applications

8-Lead SOIC

(Thermal Coastline)

ⴙV

S

–IN2

ⴙIN2

6

5

7

8

OUT2

OUT1

–IN1

ⴙIN1

–V

S

1

2

3

4

AD8018AR

PIN CONFIGURATIONS

14-Lead TSSOP

OUT1

–IN1

ⴙIN1

–V

S

PWDN1

ⴙV

S

OUT2

–IN2

ⴙIN2

PWDN0

DGND

AD8018ARU

6

5

7

8

1

2

3

4

9

14

13

12

11

10

NC

NC

NC

NC = NO CONNECT

P

LINE

– dBm

SFDR – dBc

–70

–80

–90

–60

–50

–40

–30

4186 8 10 12 14 16

N = 4.0

VS = 3.3V

VS = 5V

VS = 8V

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

S

= 5 V, N = 4 Turns, 144 kHz to 500 kHz. See Evaluation

Board Schematics in Figure 11.

REV. A

–2–

AD8018–SPECIFICATIONS

(@ 25ⴗC, VS = 5 V, RL = 100 ⍀, RF = RG = 750 ⍀ unless otherwise noted.)

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth G = 1, V

OUT

< 0.4 V p-p, RL = 5 Ω 40 50 MHz

G = 1, V

OUT

< 0.4 V p-p, RL = 100 Ω 100 130 MHz

G = 2, V

OUT

< 0.4 V p-p, RL = 5 Ω 35 40 MHz

G = 2, V

OUT

< 0.4 V p-p, RL = 100 Ω 80 100 MHz

0.1 dB Bandwidth V

OUT

< 0.4 V p-p, RL = 100 Ω 10 MHz

Large Signal Bandwidth V

OUT

= 4 V p-p, G = +2 80 MHz

Slew Rate Noninverting, V

OUT

= 4 V p-p 300 V/␮s

Rise and Fall Time Noninverting, V

OUT

= 2 V p-p 5.5 ns

Settling Time 0.1%, V

OUT

= 2 V p-p, RL = 100 Ω 25 ns

NOISE/HARMONIC
PERFORMANCE

Distortion, V

OUT

= 6 V p-p (Differential)

Second Harmonic 100 kHz, R

L

= 10 Ω –89 –94 dBc

500 kHz, RL = 10 Ω –61 –63 dBc

Third Harmonic 100 kHz, R

L

= 10 Ω –86 –89 dBc

500 kHz, RL = 10 Ω –74 –77 dBc

MTPR (In-Band) 25 kHz to 138 kHz, R

L

= 12.5 Ω, P

LINE

= +13 dBm –70 dBc

SFDR (Out-of-Band) 144 kHz to 500 kHz, RL = 12.5 Ω, P

LINE

= +13 dBm –82 dBc

Input Noise Voltage f = 100 kHz 4.5 5 nV√Hz
Input Noise Current f = 100 kHz (+Inputs) 1 pA√Hz

f = 100 kHz (–Inputs) 10 pA√Hz

Crosstalk f = 1 MHz, G = +2 –74 dB

DC PERFORMANCE

Input Offset Voltage 115mV

T

MIN

to T

MAX

17 mV
Input Offset Voltage Match 0.1 2.6 mV
Transimpedance V

OUT

= 2 V p-p, RL = 5 Ω 830 2000 kΩ

T

MIN

to T

MAX

700 kΩ

INPUT CHARACTERISTICS

Input Resistance +Input 10 M⍀

–Input 125 Ω

Input Capacitance +Input 1 pF
Input Bias Current (–) 0.3 8 ␮A

T

MIN

to T

MAX

14 ␮A
Input Bias Current (–) Match 0.1 5.5 ␮A

T

MIN

to T

MAX

8 ␮A
Input Bias Current (+) 1 1.5 ␮A

T

MIN

to T

MAX

2.5 ␮A

Input Bias Current (+) Match 0.1 0.5 ␮A

T

MIN

to T

MAX

1 ␮A
CMRR V

IN

2 V to 4 V 51 54 dB

Input CM Voltage Range 1.2 3.8 V

OUTPUT CHARACTERISTICS

Cap Load 30% Overshoot 1000 pF
Output Resistance Frequency = 100 kHz, PWDN1, PWDN0 = 1 0.2 Ω
Output Voltage Swing R

L

= 100 Ω 0.16 to 4.87 V

RL = 5 Ω 0.5 to 4.5 V

Linear Output Current SFDR < –85 dBc, f = 100 kHz, R

L

= 10 Ω, Differential 350 400 mA

Short-Circuit Current 1000 mA

POWER SUPPLY

Supply Current/Amp PWDN1 = 1, PWDN0 = 1 9 10 mA

T

MIN

to T

MAX

11.4 mA

STBY Supply Current/Amp PWDN1 = 0, PWDN0 = 1 or 4.5 5.1 mA

PWDN1 = 1, PWDN0 = 0 4.5 5.1 mA
SHUTDOWN Supply Current/Amp PWDN1 = 0, PWDN0 = 0 0.3 0.55 mA
Operating Range Single Supply 3.3 8 V
+Power Supply Rejection Ratio ⌬V

S

= ⫾1 V 60 66 dB

T

MIN

to T

MAX

56 dB

–Power Supply Rejection Ratio ⌬V

S

= ⫾1 V 52 55 dB

T

MIN

to T

MAX

50 dB

REV. A

–3–

AD8018

Parameter Conditions Min Typ Max Unit

LOGIC INPUTS (PWDN1, 0)

Logic “1” Voltage 2.0 V
Logic “0” Voltage 0.8 V
Logic Input Bias Current 240 ␮A
Standby Recovery Time RL = 10 Ω, G = +2, IS = 90% of Typical 500 ns

Specifications subject to change without notice.

ORDERING GUIDE

Temperature Package Package

Model Range Description Option

AD8018AR –40°C to +85°C 8-Lead Plastic SO-8

SOIC

AD8018AR–REEL –40°C to +85°C 8-Lead SOIC SO-8
AD8018AR–REEL7 –40°C to +85°C 8-Lead SOIC SO-8
AD8018ARU –40°C to +85°C 14-Lead Plastic RU-14

TSSOP

AD8018ARU–REEL –40°C to +85°C 14-Lead Plastic RU-14

TSSOP

AD8018ARU–REEL7 –40°C to +85°C 14-Lead Plastic RU-14

TSSOP

AD8018ARU–EVAL Evaluatio

n Board RU-14

ABSOLUTE MAXIMUM RATINGS

1

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 V

Internal Power Dissipation

2

Small Outline Package (R) . . . . . . . . . . . . . . . . . . . 650 mW

TSSOP Package (RU) . . . . . . . . . . . . . . . . . . . . . . 565 mW

Input Voltage (Common-Mode) . . . . . . . . . . . . . . . . . . . . ±V

S

Logic Voltage, PWDN0, 1 . . . . . . . . . . . . . . . . . . . . . . . . . ±V

S

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ± 1.6 V

Output Short Circuit Duration

. . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves

Storage Temperature Range RU, R . . . . . . . –65°C to +150°C

Operating Temperature Range . . . . . . . . . . . –40°C to +85°C

Lead Temperature Range (Soldering 10 sec) . . . . . . . . . 300°C

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

2

Specification is for the device on a 4-layer board in free air at 85°C:

8-Lead SOIC Package: θJA = 100°C/W.
14-Lead TSSOP Package: θJA = 115°C/W.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the AD8018
is limited by the associated rise in junction temperature. The
maximum safe junction temperature for plastic encapsulated
devices is determined by the glass transition temperature of the
plastic, approximately 150°C. Temporarily exceeding this limit
may cause a shift in parametric performance due to a change
in the stresses exerted on the die by the package. Exceeding a
junction temperature of 175°C for an extended period can result
in device failure.

While the AD8018 is internally short circuit protected, this may
not be sufficient to guarantee that the maximum junction tempera­ture (150°C) is not exceeded under all conditions. To ensure
proper operation, it is necessary to observe the maximum power
derating curves.

AMBIENT TEMPERATURE – ⴗC

2.0

–50

MAXIMUM POWER DISSIPATION – Watts

1.5

1.0

0.5

0

–40 –30 –20 –100 10 2030 4050 6070 8090

TJ = 150ⴗC

14-LEAD TSSOP PACKAGE

8-LEAD SOIC PACKAGE

Figure 3. Plot of Maximum Power Dissipation vs.
Temperature

CAUTION

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.

WARNING!

ESD SENSITIVE DEVICE

REV. A

AD8018

–4–

AD8018

ⴙV

S

V

SIGNAL

50⍀

750⍀

750⍀

–V

S

R

LOAD

V

OUT

10␮F

TANT

10␮F

TANT

0.1␮F

0.1␮F

TPC 1. Single-Ended Test Circuit

TIME – ns

0

OUTPUT VOLTAGE – mV

–50

–100

–150

50

100

0

50

100

150

G = 2
V

S

= ⴞ2.5V

R

L

= 5⍀

150 200 250 300 350 400 450 500

TPC 2. Small Signal Step Response

TIME – ns

0

OUTPUT VOLTAGE – V

–1

–2

–3

50

100

0

1

2

3

G = 2
V

S

= ⴞ2.5V

R

L

= 5⍀

150 200 250 300 350 400 450 500

TPC 3. Large Signal Step Response

–Typical Performance Characteristics

1

FREQUENCY – Hz

10

10

1

100

1000

100 1k 10k 100k 1M

0.1

10

100

VS = ⴞ2.5V
R

L

= 100⍀

V

NOISE

ⴙI

NOISE

ⴚI

NOISE

V

NOISE

– nV/ Hz (RTI)

I

NOISE

– pA/ Hz

TPC 4. I

NOISE

and V

NOISE

vs. Frequency

FREQUENCY – MHz

0.01

OUTPUT IMPEDANCE – ⍀

500

0

2k

2.5k

3k

(1,1)

(0,0)

1.5k

1k

0.1 1 10 100

1k

(1,0)

VS=ⴞ2.5V

TPC 5. Output Impedance vs. Frequency, for Full Power,
Standby, and Shutdown Modes

mV

–1

–2

–3

1

2

3

0

G = 2
V

S

= ⴞ2.5

V

IN

= 2V p-p

R

L

= 100⍀

0

10 20 30 40 50 60 70 80 10090

TIME – ns

V

OUT

– (VINⴛ2)

(–0.1%)

(+0.1%)

TPC 6. 0.1% Settling Time

REV. A

AD8018

–5–

FREQUENCY – Hz

10k

OUTPUT VOLTAGE – dBV

–25

1M

5

10M 100M

1G

100k

–22

–19

–16

–13

–10

–7

–4

–1

2

G = 2
V

S

= ⴞ2.5V

R

L

= 100⍀

TPC 7. Output Voltage vs. Frequency

LOAD RESISTANCE – ⍀

1

OUTPUT SWING – Volts

1.9

1.7

1.5
10

2.1

2.5

100 1000 10k

1.6

1.8

2.0

2.2

2.3

2.4

ⴙSWING

–SWING

VS = ⴞ2.5V

TPC 8. Output Swing vs. R

LOAD

FREQUENCY – Hz

100k

PSRR – dB

–70

–90

1M 10M

100M

–80

–60

–50

–40

–30

–20

–10

0

G = 2
V

S

= ⴞ2.5V

⌬V

S

= ⴞ1V

R

L

= 100⍀

ⴚPSRR

ⴙPSRR

TPC 9. PSRR vs. Frequency

FREQUENCY – Hz

10k

OUTPUT VOLTAGE – dBV

–25

1M

5

10M 100M 1G100k

–22

–19

–16

–13

–10

–7

–4

–1

2

G = 2
V

S

= ⴞ2.5V

R

L

= 5⍀

TPC 10. Output Voltage vs. Frequency

FREQUENCY – Hz

100k

NORMALIZED GAIN – dB

–6

1M

0

4

10M 100M

1G

–5

–4

–3

–2

–1

1

2

3

(1,1)

(1,0) or (0,1)

G = 2
V

S

= ⴞ2.5V

R

L

= 100⍀

FULL POWER

STANDBY

R

L

V

OUT

V

IN

50⍀

750⍀ 750⍀

TPC 11. Small Signal Frequency Response

FREQUENCY – Hz

100k

CMRR – dB

–70

1M 10M 100M

–60

–50

–40

–30

–20

–10

1G

G = 2
V

S

= ⴞ2.5V

R

L

= 100⍀

STANDBY

(1,0) or (0,1)

(1,1)

FULL POWER

TPC 12. CMRR vs. Frequency, Full Power, and Standby
Mode

REV. A

AD8018

–6–

500⍀

500⍀

500⍀

500⍀

25⍀

AD8138

50⍀

500⍀

750⍀

750⍀

ⴙ6V

ⴚ6V

ⴙV

S

ⴚV

S

10␮F0.1␮F

220␮F

0.1␮F
R

L

VSIG

IN

ⴚ6V

0.1␮F

ⴙ6V

0.1␮F

7.96k⍀

7.96k⍀ 402⍀

402⍀

50⍀

OUT

100⍀

100⍀

AD8018

1/2

AD8018

1/2

AD9632

0.1␮F

10␮F0.1␮F

TPC 13. Differential Test Circuit

FREQUENCY – MHz

DIFFERENTIAL DISTORTION – dBc

–110

0.01 0.1

–100

–90

–80

–70

–60

1.0

3RD HARMONIC

2ND HARMONIC

V

OUT

= 6V p–p

R

L

= 10⍀

V

S

= ⴞ 2.5V

PWDN 1,0 = 1,1

TPC 14. Differential Distortion vs. Frequency

PEAK OUTPUT CURRENT – mA

DIFFERENTIAL DISTORTION – dBc

–110

200

2ND HARMONIC

300

400 500 600 700 800

–100

–90

–80

–70

–60

–50

3RD HARMONIC

VS = ⴞ2.5V
R

L

= 3

⍀

G

= 4

f

O

= 100kHz

PWDN 1,0 = 1,1

TPC 15. Differential Distortion vs. Peak Output Current

LOAD RESISTANCE – ⍀

DIFFERENTIAL DISTORTION – dBc

–110

510

100

–100

–90

–80

–70

–60

3RD HARMONIC

2ND HARMONIC

VS = ⴞ2.5V
G = 4
f

O

= 100kHz

V

OUT

= 6V p–p

TPC 16. Differential Distortion vs. R

LOAD

OUTPUT VOLTAGE – Volts

DIFFERENTIAL DISTORTION – dBc

–110

3

45 678

–100

–90

–80

–70

–60

3RD HARMONIC

2ND HARMONIC

VS = ⴞ2.5V
R

L

= 10⍀
G = 4
f

O

= 100kHz
PWDN 1,0 = 1,1

TPC 17. Differential Distortion vs. Peak-to-Peak Output
Voltage

OUTPUT VOLTAGE – Volts

DIFFERENTIAL DISTORTION – dBc

–110

3

3RD HARMONIC

45678

–100

–90

–80

–70

–60

2ND HARMONIC

VS = ⴞ2.5V
R

L

= 10⍀
G = 4
f

O

= 100kHz
PWDN 1,0 = 1,0 or 0,1

TPC 18. Differential Distortion vs. Peak-to-Peak Output
Voltage