Analog Devices AD8131 Datasheet

Low-Cost, High-Speed

18

+D

IN

–D

IN

2

7NC

V

OCM

3

6

V+

V–

4

5

–OUT

+OUT

AD8131

NC = NO CONNECT

1.5kV

1.5kV

750V

750V

FREQUENCY – MHz

BALANCE ERROR – dB

–80

1

1000

–40

10 100

–20

–30

–50

–60

–70

DV

OUT

,dm = 2V p-p

DV

OUT

,cm/DV

OUT

, dm

VS = +5V

VS = 65V

a

FEATURES
High Speed

400 MHz –3 dB Full Power Bandwidth

2000 V/␮s Slew Rate
Fixed Gain of 2 with No External Components
Internal Common-Mode Feedback to Improve Gain

and Phase Balance

–60 dB @10 MHz
Separate Input to Set the Common-Mode Output

Voltage
Low Distortion

68 dB SFDR @ 5 MHz 200 ⍀ Load
Low Power 7.5 mA @ 3 V
Power Supply Range +2.7 V to ⴞ5 V

APPLICATIONS
Video Line Driver
Digital Line Driver
Low Power Differential ADC Driver
Differential In/Out Level Shifting
Single-Ended Input to Differential Output Driver

Differential Driver

AD8131

FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

The AD8131 is a differential or single-ended input to differen­tial output driver requiring no external components for a fixed
gain of 2. The AD8131 is a major advancement over op amps
for driving signals over long lines or for driving differential input
ADCs. The AD8131 has a unique internal feedback feature that
provides output gain and phase matching that are balanced to
–60 dB at 10 MHz, reducing radiated EMI and suppressing
harmonics. Manufactured on ADI’s next generation XFCB
bipolar process, the AD8131 has a –3 dB bandwidth of 400 MHz
and delivers a differential signal with very low harmonic distortion.

The AD8131 is a differential driver for the transmission of
high-speed signals over low-cost twisted pair or coax cables.
The AD8131 can be used for either analog or digital video
signals or for other high-speed data transmission. The AD8131
driver is capable of driving either Cat3 or Cat5 twisted pair or coax
with minimal line attenuation. The AD8131 has considerable
cost and performance improvements over discrete line driver
solutions.

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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.

Figure 1. Output Balance Error vs. Frequency

The AD8131 can replace transformers in a variety of applica­tions preserving low frequency and dc information. The AD8131
does not have the susceptibility to magnetic interference and
hysteresis of transformers, while being smaller in size, easier
to work with, and has the high reliability associated with ICs.

The AD8131’s differential output also helps balance the input
for differential ADCs, optimizing the distortion performance of
the ADCs. The common-mode level of the differential output
is adjustable by a voltage on the V

pin, easily level-shifting

OCM

the input signals for driving single supply ADCs with dual supply
signals. Fast overload recovery preserves sampling accuracy.

The AD8131 will be available in both SOIC and µSOIC packages

for operation over –40ⴗC to +85ⴗC.

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., 1999

AD8131–SPECIFICATIONS

(@ 25ⴗC, VS = ⴞ5 V, V

= 0, G = 2, R

OCM

= 200 ⍀, unless otherwise noted. Refer to

L,dm

Figures 2 and 37 for test setup and label descriptions. All specifications refer to single-ended input and differential outputs unless noted.)

Parameter Conditions Min Typ Max Unit

ⴞDIN to ⴞOUT Specifications

DYNAMIC PERFORMANCE

–3 dB Large Signal Bandwidth V
–3 dB Small Signal Bandwidth V
Bandwidth for 0.1 dB Flatness V
Slew Rate V
Settling Time 0.1%, V
Overdrive Recovery Time VIN = 5 V to 0 V Step 5 ns

NOISE/HARMONIC PERFORMANCE

Second Harmonic V

Third Harmonic V

IMD 20 MHz, R
IP3 20 MHz, R

Voltage Noise (RTO) f = 20 MHz 25 nV/√Hz

Differential Gain Error NTSC, R
Differential Phase Error NTSC, R

INPUT CHARACTERISTICS

Offset Voltage V

Input Resistance Single-Ended Input 1.125 kΩ

Input Capacitance 1pF
Input Common-Mode Voltage –7.0 to +5.0 V

CMRR ∆V

OUTPUT CHARACTERISTICS

Output Voltage Swing Maximum ∆V

Linear Output Current 60 mA

Gain ∆V
Output Balance Error ∆V

V

to ⴞOUT Specifications

OCM

DYNAMIC PERFORMANCE

–3 dB Bandwidth ∆V

Slew Rate V

DC PERFORMANCE

Input Voltage Range ±3.6 V
Input Resistance 120 kΩ

Input Offset Voltage V

Input Bias Current 0.5 µA

CMRR [∆V

V

OCM

Gain ∆V

POWER SUPPLY

Operating Range ±1.4 ±5.5 V

Quiescent Current V

Power Supply Rejection Ratio ∆V

OPERATING TEMPERATURE RANGE –40 +85 °C

Specifications subject to change without notice.

= 2 V p-p 400 MHz

OUT

= 0.2 V p-p 320 MHz

OUT

= 0.2 V p-p 85 MHz

OUT

= 2 V p-p, 10% to 90% 2000 V/µs

V
V
V

V
V
V

T
V
T

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OS,dm

MIN

OCM

MIN

= 2 V p-p 14 ns

OUT

= 2 V p-p, 5 MHz, R
= 2 V p-p, 20 MHz, R
= 2 V p-p, 5 MHz, R
= 2 V p-p, 20 MHz, R
= 2 V p-p, 5 MHz, R
= 2 V p-p, 20 MHz, R
= 2 V p-p, 5 MHz, R
= 2 V p-p, 20 MHz, R

= 800 Ω –54 dBc

L,dm

= 800 Ω 30 dBm

L,dm

= 150 Ω 0.01 %

L,dm

= 150 Ω 0.06 Degrees

L,dm

= V

to T

; V

OUT,dm

MAX

DIN+

Variation ±8 µV/°C

= 200 Ω –68 dBc

L,dm

= 200 Ω –63 dBc

L,dm

= 800 Ω –95 dBc

L,dm

= 800 Ω –79 dBc

L,dm

= 200 Ω –94 dBc

L,dm

= 200 Ω –70 dBc

L,dm

= 800 Ω –101 dBc

L,dm

= 800 Ω –77 dBc

L,dm

= V

DIN–

= V

= 0 V ±2 ±7mV

OCM

= Float ±4mV

to T

Variation ±10 µV/°C

MAX

Differential Input 1.5 kΩ

/∆V

OUT,dm

OUT,dm

OUT,cm

= 600 mV 210 MHz

OCM

= –1 V to +1 V 500 V/µs

OCM

= V

OS,cm

V

= Float ±2.5 mV

OCM

OUT,dm

OUT,cm

= V

DIN+

T

to T

MIN

OUT,dm

; ∆V

IN,cm

; Single-Ended Output –3.6 to +3.6 V

OUT

/∆V

; ∆V

IN,dm

/∆V

OUT,dm

; V

OUT,cm

/∆V

]; ∆V

OCM

/∆V

; ∆V

OCM

= V

DIN–

Variation 25 µA/°C

MAX

/∆VS; ∆VS = ±1 V –70 –56 dB

= ±0.5 V –70 dB

IN,cm

= ±0.5 V 1.97 2 2.03 V/V

IN,dm

; ∆V

DIN+

OCM

OCM

= 1 V –70 dB

OUT,dm

= V

OCM

DIN–

= V

= 0 V ±1.5 ±7mV

OCM

= ±0.5 V –60 dB

= ±1 V 0.988 1 1.012 V/V

= 0 V 10.5 11.5 12.5 mA

–2–

REV. 0

AD8131

SPECIFICATIONS

(@ 25ⴗC, VS = 5 V, V

for test setup and label descriptions. All specifications refer to single-ended input and differential outputs unless noted.)

Parameter Conditions Min Typ Max Unit

ⴞDIN to ⴞOUT Specifications

DYNAMIC PERFORMANCE

–3 dB Large Signal Bandwidth V
–3 dB Small Signal Bandwidth V
Bandwidth for 0.1 dB Flatness V
Slew Rate V

= 2 V p-p 385 MHz

OUT

= 0.2 V p-p 285 MHz

OUT

= 0.2 V p-p 65 MHz

OUT

= 2 V p-p, 10% to 90% 1600 V/µs

OUT

Settling Time 0.1%, V
Overdrive Recovery Time VIN = 5 V to 0 V Step 5 ns

NOISE/HARMONIC PERFORMANCE

Second Harmonic V

Third Harmonic V

= 2 V p-p, 5 MHz, R

OUT

= 2 V p-p, 20 MHz, R

V

OUT

V

= 2 V p-p, 5 MHz, R

OUT

= 2 V p-p, 20 MHz, R

V

OUT

= 2 V p-p, 5 MHz, R

OUT

= 2 V p-p, 20 MHz, R

V

OUT

= 2 V p-p, 5 MHz, R

V

OUT

V

= 2 V p-p, 20 MHz, R

OUT

IMD 20 MHz, R
IP3 20 MHz, R

Voltage Noise (RTO) f = 20 MHz 25 nV/√Hz

Differential Gain Error NTSC, R
Differential Phase Error NTSC, R

INPUT CHARACTERISTICS

Offset Voltage V

OS,dm

to T

T

MIN

= Float ±4mV

V

OCM

T

to T

MIN

Input Resistance Single-Ended Input 1.125 kΩ

Differential Input 1.5 kΩ

Input Capacitance 1pF
Input Common-Mode Voltage –1.0 to +4.0 V

CMRR ∆V

OUT,dm

OUTPUT CHARACTERISTICS

Output Voltage Swing Maximum ∆V

Linear Output Current 45 mA

Gain ∆V
Output Balance Error ∆V

V

to ⴞOUT Specifications

OCM

OUT,dm

OUT,cm

DYNAMIC PERFORMANCE

–3 dB Bandwidth ∆V

Slew Rate V

OCM

= 1.5 V to 3.5 V 450 V/µs

OCM

DC PERFORMANCE

Input Voltage Range 1.0 to 3.7 V

Input Resistance 30 kΩ

Input Offset Voltage V

OS,cm

= Float ±10 mV

V

OCM

Input Bias Current 0.5 µA

CMRR [∆V

V

OCM

Gain ∆V

OUT,dm

OUT,cm

POWER SUPPLY

Operating Range 2.7 11 V
Quiescent Current V

Power Supply Rejection Ratio ∆V

T

DIN+

MIN

OUT,dm

to T

OPERATING TEMPERATURE RANGE –40 +85 °C

Specifications subject to change without notice.

REV. 0

= 2.5 V, G = 2, R

OCM

= 2 V p-p 18 ns

OUT

= 800 Ω –51 dBc

L,dm

= 800 Ω 29 dBm

L,dm

= 150 Ω 0.02 %

L,dm

= 150 Ω 0.08 Degrees

L,dm

= V

; V

OUT,dm

Variation ±8 µV/°C

MAX

Variation ±10 µV/°C

MAX

/∆V

IN,cm

OUT

/∆V

IN,dm

/∆V

OUT,dm

= V

DIN+

; ∆V

IN,cm

; Single-Ended Output 1.0 to 3.7 V

; ∆V

IN,dm

; ∆V

OUT,dm

= 200 ⍀, unless otherwise noted. Refer to Figures 2 and 37

L,dm

= 200 Ω –67 dBc

L,dm

= 200 Ω –56 dBc

L,dm

= 800 Ω –94 dBc

L,dm

= 800 Ω –77 dBc

L,dm

= 200 Ω –74 dBc

L,dm

= 200 Ω –67 dBc

L,dm

= 800 Ω –95 dBc

L,dm

= 800 Ω –74 dBc

L,dm

DIN–

= V

= 2.5 V ±3 ±7mV

OCM

= ±0.5 V –70 dB

= ±0.5 V 1.96 2 2.04 V/V

= 1 V –62 dB

= 600 mV 200 MHz

= V

= V

; V

OUT,cm

/∆V

OCM

/∆V

OCM

= V

DIN

Variation 20 µA/°C

MAX

= V

DIN+

]; ∆V

OCM

; ∆V

OCM

= 2.5 V 9.25 10.25 11.25 mA

OCM

DIN–

= V

= 2.5 V ±5 ±12 mV

OCM

= 2.5 V ± 0.5 V –60 dB

= 2.5 V ± 1 V 0.985 1 1.015 V/V

/∆VS; ∆VS = ±0.5 V –70 –56 dB

–3–

AD8131

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

1

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±V

V

OCM

S

Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . . 250 mW

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

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

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

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause perma­nent damage to the device. This is a stress rating only, functional operation of the
device at these or any other conditions above listed in the operational section of this
specification is not implied. Exposure to Absolute Maximum Ratings for any
extended periods may affect device reliability.

2

Thermal resistance measured on SEMI standard 4-layer board.

8-Lead SOIC θJA = 121°C/W
8-Lead µSOIC θJA = 142°C/W

PIN CONFIGURATION

18

–D

IN

V

OCM

V+

+OUT

750V

2

3

1.5kV

4

AD8131

NC = NO CONNECT

PIN FUNCTION DESCRIPTIONS

Pin No. Name Function

1–D
2V

Negative Input.

IN

Voltage applied to this pin sets the common-

OCM

mode output voltage with a ratio of 1:1. For
example, 1 V dc on V

will set the dc bias

OCM

level on +OUT and –OUT to 1 V.
3 V+ Positive Supply Voltage.
4 +OUT Positive Output. Note: the voltage at –D

is

IN

inverted at +OUT.
5 –OUT Negative Output. Note: the voltage at +D

IN

is inverted at –OUT.
6 V– Negative Supply Voltage.
7 NC No Connect.
8+DINPositive Input

+D

7NC

6

V–

5

–OUT

IN

750V

1.5kV

ORDERING GUIDE

Model Temperature Range Package Description Package Option

AD8131AR –40°C to +85°C 8-Lead SOIC SO-8

AD8131AR-REEL
AD8131AR-REEL7

AD8131ARM –40°C to +85°C 8-Lead µSOIC RM-8

AD8131ARM-REEL
AD8131ARM-REEL7
AD8131-EVAL Evaluation Board

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 AD8131 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.

–4–

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