Analog Devices AD8018 a Datasheet

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

ⴙV

S

–IN2

ⴙIN2

6

5

7

8

OUT2

OUT1

–IN1

ⴙIN1

–V

S

1

2

3

4

AD8018AR

a

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,

= 12.5 ⍀, P

R

LOAD

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

–30

–40

–50

–60

SFDR – dBc

–70

–80

–90

VS = 3.3V

4186 8 10 12 14 16

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

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

V

S

Board Schematics in Figure 11.

REV. A

= 13 dBm

LINE

N = 4.0

VS = 5V

VS = 8V

P

– dBm

LINE

xDSL Line Drive Amplifier

AD8018

PIN CONFIGURATIONS

8-Lead SOIC

(Thermal Coastline)

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.

5V

750⍀

1nF

10⍀

10k⍀

750⍀

750⍀

10⍀

1nF

0.01␮F

V

IN

0.01␮F

10k⍀

10k⍀

100⍀

V

REF

0.01␮F

100⍀

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

14-Lead TSSOP

1

NC

2

OUT1

3

–IN1

ⴙIN1

4

5

–V

S

6

PWDN1

7

NC

NC = NO CONNECT

R1

3.1⍀

P

OUT

16dBm

R2

3.1⍀

TRANSFORMER

10k⍀

AD8018ARU

RL = 100⍀

1:4

14

13

12

11

10

9

8

LINE­POWER
13dBm

NC

ⴙV

S

OUT2

–IN2

ⴙIN2

PWDN0

DGND

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.

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

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

G = 1, V
G = 2, V
G = 2, V

0.1 dB Bandwidth V
Large Signal Bandwidth V

OUT

OUT

Slew Rate Noninverting, V
Rise and Fall Time Noninverting, V
Settling Time 0.1%, V

< 0.4 V p-p, RL = 5 Ω 40 50 MHz

OUT

< 0.4 V p-p, RL = 100 Ω 100 130 MHz

OUT

< 0.4 V p-p, RL = 5 Ω 35 40 MHz

OUT

< 0.4 V p-p, RL = 100 Ω 80 100 MHz

OUT

< 0.4 V p-p, RL = 100 Ω 10 MHz
= 4 V p-p, G = +2 80 MHz

= 4 V p-p 300 V/␮s

OUT

= 2 V p-p 5.5 ns

OUT

= 2 V p-p, RL = 100 Ω 25 ns

OUT

NOISE/HARMONIC
PERFORMANCE

Distortion, V
Second Harmonic 100 kHz, R

= 6 V p-p (Differential)

OUT

= 10 Ω –89 –94 dBc

L

500 kHz, RL = 10 Ω –61 –63 dBc

Third Harmonic 100 kHz, R

= 10 Ω –86 –89 dBc

L

500 kHz, RL = 10 Ω –74 –77 dBc
MTPR (In-Band) 25 kHz to 138 kHz, R
SFDR (Out-of-Band) 144 kHz to 500 kHz, RL = 12.5 Ω, P

= 12.5 Ω, P

L

= +13 dBm –70 dBc

LINE

= +13 dBm –82 dBc

LINE

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

= 2 V p-p, RL = 5 Ω 830 2000 kΩ

OUT

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

CMRR V

to T

MIN

IN

MAX

2 V to 4 V 51 54 dB

1 ␮A

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

= 100 Ω 0.16 to 4.87 V

L

RL = 5 Ω 0.5 to 4.5 V

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

= 10 Ω, Differential 350 400 mA

L

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

–Power Supply Rejection Ratio ⌬V

= ⫾1 V 60 66 dB

S

T

to T

MIN

T

MIN

MAX

= ⫾1 V 52 55 dB

S

to T

MAX

56 dB

50 dB

–2–

REV. A

AD8018

WARNING!

ESD SENSITIVE DEVICE

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.

ABSOLUTE MAXIMUM RATINGS

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

Internal Power Dissipation

2

1

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

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

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

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

S

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.

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

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.

2.0

1.5

8-LEAD SOIC PACKAGE

1.0

14-LEAD TSSOP PACKAGE

0.5

MAXIMUM POWER DISSIPATION – Watts

0

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

–50

AMBIENT TEMPERATURE – ⴗC

TJ = 150ⴗC

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.

REV. A

–3–

AD8018

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

–Typical Performance Characteristics

ⴙV

750⍀

S

750⍀

AD8018

V

SIGNAL

50⍀

–V

S

TPC 1. Single-Ended Test Circuit

150

100

50

0

–50

OUTPUT VOLTAGE – mV

–100

10␮F

10␮F

TANT

0.1␮F

0.1␮F

TANT

G = 2
V

= ⴞ2.5V

S

R

= 5⍀

L

R

LOAD

V

OUT

TPC 4. I

3k

2.5k

2k

1.5k

1k

OUTPUT IMPEDANCE – ⍀

500

NOISE

and V

vs. Frequency

NOISE

(0,0)

VS=ⴞ2.5V

(1,0)

(1,1)

–150

50

0

150 200 250 300 350 400 450 500

100

TIME – ns

TPC 2. Small Signal Step Response

TPC 5. Output Impedance vs. Frequency, for Full Power,

0

0.01

0.1 1 10 100
FREQUENCY – MHz

1k

Standby, and Shutdown Modes

(+0.1%)

(–0.1%)

3

2

1

0

mV

V

– (VINⴛ2)

–1

–2

–3

10 20 30 40 50 60 70 80 10090

0

OUT

TIME – ns

TPC 6. 0.1% Settling Time

G = 2
V

= ⴞ2.5

S

V

IN

R

L

= 100⍀

= 2V p-p

3

G = 2
V

= ⴞ2.5V

S

= 5⍀

R

L

2

1

0

–1

OUTPUT VOLTAGE – V

–2

–3

0

100

50

150 200 250 300 350 400 450 500

TIME – ns

TPC 3. Large Signal Step Response

–4–

REV. A

5

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⍀

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

2

–1

–4

–7

–10

–13

–16

OUTPUT VOLTAGE – dBV

–19

–22

–25

10k

100k

1M

FREQUENCY – Hz

10M 100M

TPC 7. Output Voltage vs. Frequency

G = 2
V

= ⴞ2.5V

S

R

= 100⍀

L

AD8018

1G

TPC 10. Output Voltage vs. Frequency

2.5

2.4

2.3

2.2

2.1

2.0

1.9

1.8

OUTPUT SWING – Volts

1.7

1.6

1.5
1

10

TPC 8. Output Swing vs. R

0

–10

–20

–30

–40

ⴚPSRR

–50

PSRR – dB

–60

–70

–80

–90

100k

TPC 9. PSRR vs. Frequency

REV. A

ⴙSWING

LOAD RESISTANCE – ⍀

ⴙPSRR

100 1000 10k

1M 10M

FREQUENCY – Hz

–SWING

VS = ⴞ2.5V

LOAD

G = 2
V
⌬V
R

= ⴞ2.5V

S

= ⴞ1V

S

= 100⍀

L

100M

4

NORMALIZED GAIN – dB

–1

–2

–3

–4

–5

–6

3

2

1

0

100k

750⍀ 750⍀

V

IN

50⍀

1M

V

OUT

R

L

STANDBY

(1,0) or (0,1)

(1,1)

FULL POWER

10M 100M

FREQUENCY – Hz

G = 2

= ⴞ2.5V

V

S

= 100⍀

R

L

TPC 11. Small Signal Frequency Response

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

–5–

1G

AD8018

VSIG

50⍀

ⴙV

S

100⍀

1/2

500⍀

500⍀

500⍀

25⍀

ⴙ6V

AD8138

ⴚ6V

500⍀

IN

100⍀

AD8018

750⍀

0.1␮F

500⍀

750⍀

AD8018

1/2

ⴚV

S

10␮F0.1␮F

220␮F

AD9632

R

L

10␮F0.1␮F

7.96k⍀ 402⍀

0.1␮F

ⴙ6V

0.1␮F

0.1␮F

ⴚ6V

7.96k⍀

50⍀

OUT

402⍀

TPC 13. Differential Test Circuit

–60

–70

–80

3RD HARMONIC

V

= 6V p–p

OUT

R

= 10⍀

L

V

= ⴞ 2.5V

S

PWDN 1,0 = 1,1

–60

–70

–80

–90

–100

DIFFERENTIAL DISTORTION – dBc

–110

510

2ND HARMONIC

3RD HARMONIC

LOAD RESISTANCE – ⍀

TPC 16. Differential Distortion vs. R

–60

–70

–80

2ND HARMONIC

VS = ⴞ2.5V
G = 4
f

= 100kHz

O

V

= 6V p–p

OUT

LOAD

VS = ⴞ2.5V
R

= 10⍀

L

G = 4
f

= 100kHz

O

PWDN 1,0 = 1,1

100

–90

–100

DIFFERENTIAL DISTORTION – dBc

–110

0.01 0.1
FREQUENCY – MHz

2ND HARMONIC

1.0

TPC 14. Differential Distortion vs. Frequency

–50

VS = ⴞ2.5V
R

= 3

⍀

L

G

= 4

–60

f

= 100kHz

DIFFERENTIAL DISTORTION – dBc

–100

–110

–70

–80

–90

O

PWDN 1,0 = 1,1

200

300

PEAK OUTPUT CURRENT – mA

3RD HARMONIC

2ND HARMONIC

400 500 600 700 800

TPC 15. Differential Distortion vs. Peak Output Current

–90

3RD HARMONIC

–100

DIFFERENTIAL DISTORTION – dBc

–110

3

45 678

OUTPUT VOLTAGE – Volts

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

DIFFERENTIAL DISTORTION – dBc

–60

–70

–80

–90

–100

–110

2ND HARMONIC

3

45678

OUTPUT VOLTAGE – Volts

VS = ⴞ2.5V
R

= 10⍀

L

G = 4
f

= 100kHz

O

PWDN 1,0 = 1,0 or 0,1

3RD HARMONIC

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

–6–

REV. A