Burr Brown OPA2681U-2K5, OPA2681U, OPA2681N-2K5, OPA2681N Datasheet

Dual Wideband, Current Feedback

OPERATIONAL AMPLIFIER With Disable

DESCRIPTION

The OPA2681 sets a new level of performance for broadband dual
current feedback op amps. Operating on a very low 6mA/ch
supply current, the OPA2681 offers a slew rate and output power
normally associated with a much higher supply current. A new
output stage architecture delivers a high output current with
minimal voltage headroom and crossover distortion. This gives
exceptional single supply operation. Using a single +5V supply,
the OPA2681 can deliver a 1V to 4V output swing with over
100mA drive current and 150MHz bandwidth. This combination
of features makes the OPA2681 an ideal RGB line driver or single
supply ADC input driver.

OPA2681

®

FEATURES

●

WIDEBAND +5V OPERATION: 225MHz (G = +2)

●

UNITY GAIN STABLE: 280MHz (G = 1)

● HIGH OUTPUT CURRENT: 150mA

● OUTPUT VOLTAGE SWING: ±4.0V

● HIGH SLEW RATE: 2100V/µs

● LOW SUPPLY CURRENT: 6mA/ch

● LOW DISABLED CURRENT: 200µA/ch

● ENABLE/DISABLE TIME: 25ns/100ns

APPLICATIONS

● xDSL LINE DRIVER

● MATCHED I/Q CHANNEL AMPLIFIER

● BROADBAND VIDEO BUFFERS

● HIGH SPEED IMAGING CHANNELS

● PORTABLE INSTRUMENTS

● DIFFERENTIAL ADC DRIVERS

● ACTIVE FILTERS

● WIDEBAND INVERTING SUMMING

The OPA2681’s low 6mA/ch supply current is precisely trimmed
at 25°C. This trim, along with low drift over temperature, guaran­tees lower guaranteed maximum supply current than competing
products. System power may be further reduced by using the
optional disable control pin (SO-14 only). Leaving this disable
pin open, or holding it high, gives normal operation. If pulled low,
the OPA2681 supply current drops to less than 400µA while the
output goes into a high impedance state. This feature may be used
for either power savings or for video MUX applications.

©

1997 Burr-Brown Corporation PDS-1440B Printed in U.S.A. October, 1998

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

TM

Single Supply ADSL Upstream Driver

100Ω

2kΩ

2kΩ

1µF

12.4Ω

100Ω

2Vp-p

324Ω

324Ω

1/2

OPA2681

1/2

OPA2681

+12V

1:2

15Vp-p

12.4Ω

+6.5V

OPA2681 RELATED PRODUCTS

SINGLES DUALS TRIPLES

Voltage Feedback OPA680 OPA2680 OPA3680
Current Feedback OPA681 OPA2681 OPA3681
Fixed Gain OPA682 OPA2682 OPA3682

OPA2681

OPA2681

2

®

OPA2681

SPECIFICATIONS: VS = ±5V

RF = 402Ω, RL = 100Ω, and G = +2, (Figure 1 for AC performance only), unless otherwise noted.

OPA2681U, N

TYP GUARANTEED

0°C to –40°C to

MIN/

TEST

PARAMETER CONDITIONS +25°C +25°C

(2)

70°C

(3)

+85°C

(3)

UNITS MAX

LEVEL

(1)

AC PERFORMANCE (Figure 1)

Small-Signal Bandwidth (V

O

= 0.5Vp-p) G = +1, RF = 453Ω 280 MHz typ C

G = +2, R

F

= 402Ω 220 220 210 190 MHz min B

G = +5, R

F

= 261Ω 185 MHz typ C

G = +10, R

F

= 180Ω 125 MHz typ C

Bandwidth for 0.1dB Gain Flatness G = +2, V

O

= 0.5Vp-p 90 50 45 45 MHz min B

Peaking at a Gain of +1 R

F

= 453, VO = 0.5Vp-p 0.4 2 4 dB max B

Large-Signal Bandwidth G = +2, V

O

= 5Vp-p 150 MHz typ C
Slew Rate G = +2, 4V Step 2100 1600 1600 1200 V/µs min B
Rise/Fall Time G = +2, V

O

= 0.5V Step 1.7 ns typ C

G = +2, 5V Step 2.0 ns typ C

Settling Time to 0.02% G = +2, V

O

= 2V Step 12 ns typ C

0.1% G = +2, V

O

= 2V Step 8 ns typ C

Harmonic Distortion G = +2, f = 5MHz, V

O

= 2Vp-p

2nd Harmonic R

L

= 100Ω –79 –73 –70 –68 dBc max B

R

L

≥ 500Ω –85 –77 –70 –69 dBc max B

3rd Harmonic R

L

= 100Ω –74 –71 –71 –68 dBc max B

R

L

≥ 500Ω –77 –75 –74 –72 dBc max B
Input Voltage Noise f > 1MHz 2.5 3.0 3.4 3.6 nV/√Hz max B
Non-Inverting Input Current Noise f > 1MHz 12 14 15 15 pA/√Hz max B
Inverting Input Current Noise f > 1MHz 15 18 18 19 pA/√Hz max B
Differential Gain G = +2, NTSC, V

O

= 1.4Vp, RL = 150Ω 0.001 % typ C

R

L

= 37.5Ω 0.008 % typ C

Differential Phase G = +2, NTSC, V

O

= 1.4Vp, RL = 150Ω 0.01 deg typ C

R

L

= 37.5Ω 0.05 deg typ C

Channel-to-Channel Crosstalk f = 5MHz –70 dBc typ C

DC PERFORMANCE

(4)

Open-Loop Transimpedance Gain (ZOL)

VO = 0V, RL = 100Ω 100 56 56 56 kΩ min A

Input Offset Voltage V

CM

= 0V ±1.3 ±5 ±6.5 ±7.5 mV max A

Average Offset Voltage Drift V

CM

= 0V +35 +40 µV/°C max B

Non-Inverting Input Bias Current V

CM

= 0V +30 +55 ±65 ±85 µA max A

Average Non-Inverting Input Bias Current Drift V

CM

= 0V –400 –450 nA/°C max B

Inverting Input Bias Current V

CM

= 0V ±10 ±40 ±50 ±55 µA max A

Average Inverting Input Bias Current Drift V

CM

= 0V –125 –150 nA°/C max B

INPUT

Common-Mode Input Range (CMIR)

(5)

±3.5 ±3.4 ±3.3 ±3.2 V min A

Common-Mode Rejection (CMR) V

CM

= 0V 52 47 46 45 dB min A
Non-Inverting Input Impedance 100 || 2 kΩ || pF typ C
Minimum Inverting Input Resistance (RI)

Open-Loop 45 27 25 24 Ω min A

Maximum Inverting Input Resistance (RI)

Open-Loop 45 60 62 68 Ω max A

OUTPUT

Voltage Output Swing No Load ±4.0

±3.8 ±3.7 ±3.6 V min A

100Ω Load ±3.9

±3.7 ±3.6 ±3.3 V min A

Current Output, Sourcing V

O

= 0 +190 +160 +140 +80 mA min A

Current Output, Sinking V

O

= 0 –150 –135 –130 –80 mA min A

Closed-Loop Output Impedance G = +2, f = 100kHz 0.03 Ω typ C

DISABLE

(Disabled Low) (SO-14 only)

Power Down Supply Current (+VS)V

DIS

= 0, Both Channels -600 µA typ C
Disable Time 100 ns typ C
Enable Time 25 ns typ C
Off Isolation G = +2, 5MHz 70 dB typ C
Output Capacitance in Disable 4 pF typ C
Turn On Glitch G = +2, R

L

= 150Ω, VIN = 0 ±50 mV typ C

Turn Off Glitch G = +2, R

L

= 150Ω, VIN = 0 ±20 mV typ C
Enable Voltage 3.3 3.5 3.6 3.7 V min A
Disable Voltage 1.8 1.7 1.6 1.5 V max A
Control Pin Input Bias Current (DIS) V

DIS

= 0, Each Channel 100 160 160 160 µA max A

POWER SUPPLY

Specified Operating Voltage ±5 V typ C
Maximum Operating Voltage Range

±6 ±6 ±6 V max A

Max Quiescent Current V

S

= ±5V 12 12.4 13 13.2 mA max A

Min Quiescent Current V

S

= ±5V 12 11.4 11 10 mA min A

Power Supply Rejection Ratio (–PSRR) Input Referred 58 52 50 49 dB min A

TEMPERATURE RANGE

Specification: U, N

–40 to +85

°C typ C

Thermal Resistance,

θ

JA

Junction-to-Ambient
U SO-8 125 °C/W typ C
N SO-14 100 °C/W typ C

NOTES: (1) Test Levels: (A) 100% tested at 25°C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation.
(C) Typical value only for information. (2) Junction temperature = ambient for 25°C guaranteed specifications. (3) Junction temperature = ambient at low temperature
limit: junction temperature = ambient +23°C at high temperature limit for over temperature guaranteed specifications. (4) Current is considered positive out of node. V

CM

is the input common-mode voltage. (5) Tested < 3dB below minimum specified CMR at ± CMIR limits.

3

®

OPA2681

SPECIFICATIONS: VS = +5V

RF = 499Ω, RL = 100Ω to VS/2, G = +2, (Figure 2 for AC performance only), unless otherwise noted.

OPA2681U, N

TYP GUARANTEED

0°C to –40°C to

MIN/

TEST

PARAMETER CONDITIONS +25°C +25°C

(2)

70°C

(3)

+85°C

(3)

UNITS MAX

LEVEL

(1)

AC PERFORMANCE (Figure 2)

Small Signal Bandwidth (V

O

= 0.5Vp-p) G = +1, RF = 649Ω 250 MHz typ C

G = +2, R

F

= 499Ω 225 180 140 110 MHz min B

G = +5, R

F

= 360Ω 180 MHz typ C

G = +10, R

F

= 200Ω 165 MHz typ C

Bandwidth for 0.1dB Gain Flatness G = +2, V

O

< 0.5Vp-p 100 50 45 45 MHz min B

Peaking at a Gain of +1 R

F

= 649Ω, VO < 0.5Vp-p 0.4 2 4 dB max B

Large Signal Bandwidth G = +2, V

O

= 2Vp-p 200 MHz min B
Slew Rate G = +2, 2V Step 830 700 680 570 V/µs min B
Rise/Fall Time G = +2, V

O

= 0.5V Step 1.5 ns typ C

G = +2, V

O

= 2V Step 2.0 ns typ C

Settling Time to 0.02% G = +2, V

O

= 2V Step 14 ns typ C

0.1% G = +2, V

O

= 2V Step 9 ns typ C

Harmonic Distortion G = +2, f = 5MHz, V

O

= 2Vp-p

2nd Harmonic RL = 100Ω to VS/2 –70 –68 –67 –63 dBc max B

RL ≥ 500Ω to VS/2 –72 –70 –70 –68 dBc max B

3rd Harmonic RL = 100Ω to VS/2 –72 –65 –65 –62 dBc max B

RL ≥ 500Ω to VS/2 –73 –68 –67 –67 dBc max B
Input Voltage Noise f > 1MHz 2.2 3 3.4 3.6 nV/√Hz max B
Non-Inverting Input Current Noise f > 1MHz 12 14 14 15 pA/√Hz max B
Inverting Input Current Noise f > 1MHz 15 18 18 19 pA/√Hz max B

DC PERFORMANCE

(4)

Open-Loop Transimpedance Gain (ZOL)

VO = VS/2, RL = 100Ω to VS/2 100 60 53 51 kΩ min A

Input Offset Voltage V

CM

= 2.5V ±1 ±5 ±6.0 ±7 mV max A

Average Offset Voltage Drift V

CM

= 2.5V +15 +20 µV/°C max B

Non-Inverting Input Bias Current V

CM

= 2.5V +40 +65 +75 +95 µA max A

Average Non-Inverting Input Bias Current Drift V

CM

= 2.5V –300 –350 nA/°C max B

Inverting Input Bias Current V

CM

= 2.5V ±5 ±20 ±25 ±35 µA max A

Average Inverting Input Bias Current Drift V

CM

= 2.5V –125 –175 nA/°C max B

INPUT

Least Positive Input Voltage

(5)

1.5 1.6 1.7 1.8 V max A

Most Positive Input Voltage

(5)

3.5 3.4 3.3 3.2 V min A

Common-Mode Rejection (CMR) V

CM

= 2.5V 51 45 44 44 dB min A
Non-Inverting Input Impedance 100 || 2 kΩ || pF typ C
Minimum Inverting Input Resistance (RI)

Open-Loop 45 32 30 29 Ω min A

Maximum Inverting Input Resistance (RI)

Open-Loop 45 65 67 74 Ω max A

OUTPUT

Most Positive Output Voltage No Load 4 3.8 3.7 3.5 V min A

R

L

= 100Ω, 2.5V 3.9 3.7 3.6 3.4 V min A

Least Positive Output Voltage No Load 1 1.2 1.3 1.5 V max A

R

L

= 100Ω, 2.5V 1.1 1.3 1.4 1.6 V max A

Current Output, Sourcing V

O

= VS/2 150 110 110 60 mA min A

Current Output, Sinking V

O

= VS/2 –110 –75 –70 –50 mA min A

Closed-Loop Output Impedance G = +2, f = 100kHz 0.03 Ω typ C

DISABLE (Disable Low) (SO-14 only)

Power Down Supply Current (+V

S

)V

DIS

= 0, Both Channels -500 µA typ C
Disable Time 100 ns typ C
Enable Time 25 ns typ C
Off Isolation G = +2, 5MHz 65 dB typ C
Output Capacitance in Disable 4 pF typ C
Turn On Glitch G = +2, R

L

= 150Ω, VIN = VS /2 ±50 mV typ C

Turn Off Glitch G = +2, R

L

= 150Ω, VIN = VS /2 ±20 mV typ C
Enable Voltage 3.3 3.5 3.6 3.7 V min A
Disable Voltage 1.8 1.7 1.6 1.5 V max A
Control Pin Input Bias Current (DIS) V

DIS

= 0, Each Channel 100 µA typ C

POWER SUPPLY

Specified Single Supply Operating Voltage 5 V typ C
Maximum Single Supply Operating Voltage 12 12 12 V max A
Max Quiescent Current V

S

= +5V 9.6 10.6 10.8 10.8 mA max A

Min Quiescent Current V

S

= +5V 9.6 8.2 8.0 8.0 mA min A

Power Supply Rejection Ratio (–PSRR) Input Referred 48 dB typ C

TEMPERATURE RANGE

Specification: U, N

–40 to +85

°C typ C

Thermal Resistance,

θ

JA

U SO-8 125 °C/W typ C
N SO-14 100 °C/W typ C

NOTES: (1) Test Levels: (A) 100% tested at 25°C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation.
(C) Typical value only for information. (2) Junction temperature = ambient for 25°C guaranteed specifications. (3) Junction temperature = ambient at low temperature
limit: junction temperature = ambient +23°C at high temperature limit for over temperature guaranteed specifications. (4) Current is considered positive out of node. V

CM

is the input common-mode voltage. (5) Tested < 3dB below minimum specified CMR at ±CMIR limits.

4

®

OPA2681

1

2

3

4

5

6

7

14

13

12

11

10

9

8

–In A

+In A

DIS A

–V

S

DIS B

+In B

–In B

Out A

NC

NC

+V

S

NC

NC

Out B

1
2
3
4

8
7
6
5

+V

S

Out B
–In B
+In B

Out A

–In A
+In A

–V

S

ABSOLUTE MAXIMUM RATINGS

Power Supply .............................................................................. ±6.5VDC

Internal Power Dissipation

(1)

............................ See Thermal Information

Differential Input Voltage .................................................................. ±1.2V

Input Voltage Range ............................................................................ ±V

S

Storage Temperature Range: U, N................................ –40°C to +125°C

Lead Temperature (soldering, 10s) .............................................. +300°C

Junction Temperature (T

J

) ........................................................... +175°C

NOTE:: (1) Packages must be derated based on specified

θ

JA

. Maximum T

J

must be observed.

ELECTROSTATIC
DISCHARGE SENSITIVITY

Electrostatic discharge can cause damage ranging from perfor­mance degradation to complete device failure. Burr-Brown
Corporation recommends that all integrated circuits be handled
and stored using appropriate ESD protection methods.

ESD damage can range from subtle performance degradation to
complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet published specifica­tions.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

PIN CONFIGURATIONS

Top View SO-8

SO-14

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER

(1)

RANGE MARKING NUMBER

(2)

MEDIA

OPA2681U SO-8 Surface Mount 182 –40°C to +85°C OPA2681U OPA2681U Rails

" " " " " OPA2681U/2K5 Tape and Reel

OPA2681N SO-14 Surface Mount 235 –40°C to –85°C OPA2681N OPA2681N Rails

" " " " " OPA2681N/2K5 Tape and Reel

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are available
only as Tape and Reel in the quantity indicated after the slash (e.g. /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of the OPA2681U/2K5 will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of the Burr-Brown IC Data Book.

PACKAGE/ORDERING INFORMATION

5

®

OPA2681

TYPICAL PERFORMANCE CURVES: VS = ±5V

G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1).

2
1

0
–1
–2
–3
–4
–5
–6
–7
–8

Frequency (25MHz/div)

0 250MHz125MHz

SMALL-SIGNAL FREQUENCY RESPONSE

Normalized Gain (1dB/div)

G = +10, RF = 180Ω

G = +5, RF = 261Ω

G = +1, RF = 453Ω

G = +2, RF = 402Ω

8
7
6
5
4
3
2
1

0
–1
–2

Frequency (25MHz/div)

0 250MHz125MHz

LARGE-SIGNAL FREQUENCY RESPONSE

Gain (1dB/div)

2Vp-p

G = +2, RL = 100Ω

1Vp-p

4Vp-p

7Vp-p

400
300
200
100

0
–100
–200
–300
–400

SMALL-SIGNAL PULSE RESPONSE

Time (5ns/div)

Output Voltage (100mV/div)

G = +2

V

O

= 0.5Vp-p

+4
+3
+2
+1

0
–1
–2
–3
–4

LARGE-SIGNAL PULSE RESPONSE

Time (5ns/div)

Output Voltage (1V/div)

G = +2

V

O

= 5Vp-p

5.0

4.0

2.0
0

2.0

1.6

1.2

0.8

0.4
0

LARGE-SIGNAL DISABLE/ENABLE RESPONSE

Time (50ns/div)

Output Voltage (400mV/div)

6.0

4.0

2.0
0

V

DIS

(2V/div)

V

DIS

Output Voltage

(SO-14 only)

G = +2

V

IN

= +1V

CHANNEL-TO-CHANNEL CROSSTALK

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

–100

Frequency (MHz)

1 10 100

Crosstalk (10dB/div)

6

®

OPA2681

TYPICAL PERFORMANCE CURVES: VS = ±5V (CONT)

G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1).

–60

–65

–70

–75

–80

–85

–90

5MHz 2ND HARMONIC DISTORTION

vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

0.1 1 10

2nd Harmonic Distortion (dBc)

RL = 200Ω

RL = 500Ω

RL = 100Ω

–60

–65

–70

–75

–80

–85

–90

5MHz 3RD HARMONIC DISTORTION

vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

0.1 1 10

3rd Harmonic Distortion (dBc)

RL = 200Ω

RL = 100Ω

RL = 500Ω

–60

–65

–70

–75

–80

–85

–90

10MHz 2ND HARMONIC DISTORTION

vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

0.1 1 10

2nd Harmonic Distortion (dBc)

RL = 500Ω

RL = 100Ω

RL = 200Ω

–60

–65

–70

–75

–80

–85

–90

10MHz 3RD HARMONIC DISTORTION

vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

0.1 1 10

3rd Harmonic Distortion (dBc)

RL = 500Ω

RL = 100Ω

RL = 200Ω

–50

–55

–60

–65

–70

–75

–80

20MHz 2ND HARMONIC DISTORTION

vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

0.1 1 10

2nd Harmonic Distortion (dBc)

RL = 500Ω

RL = 100Ω

RL = 200Ω

–50

–55

–60

–65

–70

–75

–80

20MHz 3RD HARMONIC DISTORTION

vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

0.1 1 10

3rd Harmonic Distortion (dBc)

RL = 500Ω

RL = 100Ω

RL = 200Ω

7

®

OPA2681

TYPICAL PERFORMANCE CURVES: VS = ±5V (CONT)

G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1).

–40

–50

–60

–70

–80

–90

2ND HARMONIC DISTORTION vs FREQUENCY

Frequency (MHz)

0.1 1 10 20

2nd Harmonic Distortion (dBc)

VO = 2Vp-p
R

L

= 100Ω

G = +2, RF = 402Ω

G = +10, RF = 180Ω

G = +5, RF = 261Ω

–40

–50

–60

–70

–80

–90

3RD HARMONIC DISTORTION vs FREQUENCY

Frequency (MHz)

0.1 1 10 20

3rd Harmonic Distortion (dBc)

VO = 2Vp-p
R

L

= 100Ω

G = +2,

R

F

= 402Ω

G = +10, RF = 180Ω

G = +5, RF = 261Ω

–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90

TWO-TONE, 3RD-ORDER

INTERMODULATION SPURIOUS

Single-Tone Load Power (dBm)

–8–6–4–20246810

3rd-Order Spurious Level (dBc)

dBc = dB below carriers

50MHz

20MHz

10MHz

Load Power at Matched 50Ω Load

60

50

40

30

20

10

0

RECOMMENDED R

S

vs CAPACITIVE LOAD

Capacitive Load (pF)

1 10 100

R

S

(Ω)

15
12

9
6
3

0
–3
–6
–9

–12
–15

Frequency (30MHz/div)

0 300MHz150MHz

FREQUENCY RESPONSE vs CAPACITIVE LOAD

Gain to Capacitive Load (3dB/div)

R

S

V

IN

V

O

C

L

1kΩ

402Ω

402Ω

1kΩ is optional.

CL = 22pF

CL = 10pF

CL = 47pF

CL = 100pF

100

10

1

INPUT VOLTAGE AND CURRENT NOISE DENSITY

Frequency (Hz)

100 1k 10k 100k 1M 10M

Current Noise (pA/√Hz)

Voltage Noise (nV/√Hz)

Non-Inverting Input Current Noise

Inverting Input Current Noise

12.2pA/√Hz

15.1pA/√Hz

Voltage Noise

2.2nV/√Hz