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
q
WIDEBAND +5V OPERATION: 225MHz (G = +2)
q
UNITY GAIN STABLE: 280MHz (G = 1)
q
HIGH OUTPUT CURRENT: 150mA
q
OUTPUT VOLTAGE SWING:
4.0V
q
HIGH SLEW RATE: 2100V/
s
q
LOW SUPPLY CURRENT: 6mA/ch
q
LOW DISABLED CURRENT: 200
A/ch
q
ENABLE/DISABLE TIME: 25ns/100ns
APPLICATIONS
q
xDSL LINE DRIVER
q
MATCHED I/Q CHANNEL AMPLIFIER
q
BROADBAND VIDEO BUFFERS
q
HIGH SPEED IMAGING CHANNELS
q
PORTABLE INSTRUMENTS
q
DIFFERENTIAL ADC DRIVERS
q
ACTIVE FILTERS
q
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, guaran-
tees 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 400
A 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: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
TM
Single Supply ADSL Upstream Driver
100
2k
2k
1
F
12.4
100
2Vp-p
324
324
1/2
OPA2681
1/2
OPA2681
+12V
1:2
15Vp-p
12.4
+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: V
S
=
5V
R
F
= 402
, R
L
= 100
, 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, R
F
= 453
280
MHz
typ
C
G = +2, R
F
= 402
220
220
210
190
MHz
min
B
G = +5, R
F
= 261
185
MHz
typ
C
G = +10, R
F
= 180
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, V
O
= 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/
s
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
= 100
79
73
70
68
dBc
max
B
R
L
500
85
77
70
69
dBc
max
B
3rd Harmonic
R
L
= 100
74
71
71
68
dBc
max
B
R
L
500
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, R
L
= 150
0.001
%
typ
C
R
L
= 37.5
0.008
%
typ
C
Differential Phase
G = +2, NTSC, V
O
= 1.4Vp, R
L
= 150
0.01
deg
typ
C
R
L
= 37.5
0.05
deg
typ
C
Channel-to-Channel Crosstalk
f = 5MHz
70
dBc
typ
C
DC PERFORMANCE
(4)
Open-Loop Transimpedance Gain (Z
OL
)
V
O
= 0V, R
L
= 100
100
56
56
56
k
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
V/
C
max
B
Non-Inverting Input Bias Current
V
CM
= 0V
+30
+55
65
85
A
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
A
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
k
|| pF
typ
C
Minimum Inverting Input Resistance (R
I
)
Open-Loop
45
27
25
24
min
A
Maximum Inverting Input Resistance (R
I
)
Open-Loop
45
60
62
68
max
A
OUTPUT
Voltage Output Swing
No Load
4.0
3.8
3.7
3.6
V
min
A
100
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
typ
C
DISABLE (Disabled Low) (SO-14 only)
Power Down Supply Current (+V
S
)
V
DIS
= 0, Both Channels
-600
A
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
= 150
, V
IN
= 0
50
mV
typ
C
Turn Off Glitch
G = +2, R
L
= 150
, V
IN
= 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
A
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,
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: V
S
= +5V
R
F
= 499
, R
L
= 100
to V
S
/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, R
F
= 649
250
MHz
typ
C
G = +2, R
F
= 499
225
180
140
110
MHz
min
B
G = +5, R
F
= 360
180
MHz
typ
C
G = +10, R
F
= 200
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
= 649
, V
O
< 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/
s
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
R
L
= 100
to V
S
/ 2
70
68
67
63
dBc
max
B
R
L
500
to V
S
/2
72
70
70
68
dBc
max
B
3rd Harmonic
R
L
= 100
to V
S
/ 2
72
65
65
62
dBc
max
B
R
L
500
to V
S
/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 (Z
OL
)
V
O
= V
S
/2, R
L
= 100
to V
S
/2
100
60
53
51
k
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
V/
C
max
B
Non-Inverting Input Bias Current
V
CM
= 2.5V
+40
+65
+75
+95
A
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
A
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
k
|| pF
typ
C
Minimum Inverting Input Resistance (R
I
)
Open-Loop
45
32
30
29
min
A
Maximum Inverting Input Resistance (R
I
)
Open-Loop
45
65
67
74
max
A
OUTPUT
Most Positive Output Voltage
No Load
4
3.8
3.7
3.5
V
min
A
R
L
= 100
, 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
= 100
, 2.5V
1.1
1.3
1.4
1.6
V
max
A
Current Output, Sourcing
V
O
= V
S
/2
150
110
110
60
mA
min
A
Current Output, Sinking
V
O
= V
S
/2
110
75
70
50
mA
min
A
Closed-Loop Output Impedance
G = +2, f = 100kHz
0.03
typ
C
DISABLE (Disable Low) (SO-14 only)
Power Down Supply Current (+V
S
)
V
DIS
= 0, Both Channels
-500
A
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
= 150
, V
IN
= V
S
/2
50
mV
typ
C
Turn Off Glitch
G = +2, R
L
= 150
, V
IN
= V
S
/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
A
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,
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
JA
. Maximum T
J
must be observed.
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from perfor-
mance 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 specifica-
tions.
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: V
S
=
5V
G = +2, R
F
= 402
, R
L
= 100
, unless otherwise noted (see Figure 1).
2
1
0
1
2
3
4
5
6
7
8
Frequency (25MHz/div)
0
250MHz
125MHz
SMALL-SIGNAL FREQUENCY RESPONSE
Normalized Gain (1dB/div)
G = +10, R
F
= 180
G = +5, R
F
= 261
G = +1, R
F
= 453
G = +2, R
F
= 402
8
7
6
5
4
3
2
1
0
1
2
Frequency (25MHz/div)
0
250MHz
125MHz
LARGE-SIGNAL FREQUENCY RESPONSE
Gain (1dB/div)
2Vp-p
G = +2, R
L
= 100
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)
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