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Электронный компонент: OPA688

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1
OPA688
Unity Gain Stable, Wideband
VOLTAGE LIMITING AMPLIFIER
OPA688
FEATURES
q
HIGH LINEARITY NEAR LIMITING
q
FAST RECOVERY FROM OVERDRIVE: 2.4ns
q
LIMITING VOLTAGE ACCURACY:
15mV
q
3dB BANDWIDTH (G = +1): 530MHz
q
SLEW RATE: 1000V/
s
q
5V AND 5V SUPPLY OPERATION
q
HIGH GAIN VERSION: OPA689
APPLICATIONS
q
FAST LIMITING ADC INPUT BUFFER
q
CCD PIXEL CLOCK STRIPPING
q
VIDEO SYNC STRIPPING
q
HF MIXER
q
IF LIMITING AMPLIFIER
q
AM SIGNAL GENERATION
q
NON-LINEAR ANALOG SIGNAL PROCESSING
q
COMPARATOR
DESCRIPTION
The OPA688 is a wideband, unity gain stable voltage
feedback op amp that offers bipolar output voltage lim-
iting. Two buffered limiting voltages take control of the
output when it attempts to drive beyond these limits.
This new output limiting architecture holds the limiter
offset error to
15mV. The op amp operates linearly to
within 30mV of the output limit voltages.
The combination of narrow nonlinear range and low
limiting offset allows the limiting voltages to be set
within 100mV of the desired linear output range. A fast
2.4ns recovery from limiting ensures that overdrive sig-
nals will be transparent to the signal channel. Imple-
menting the limiting function at the output, as opposed to
the input, gives the specified limiting accuracy for any
gain, and allows the OPA688 to be used in all standard
op amp applications.
Non-linear analog signal processing will benefit from
the OPA688's sharp transition from linear operation to
output limiting. The quick recovery time supports high
speed applications.
The OPA688 is available in an industry standard pinout
in PDIP-8 and SO-8 packages. For higher gain, or
transimpedance applications requiring output limiting
with fast recovery, consider the OPA689.
1997 Burr-Brown Corporation
PDS-1424D
Printed in U.S.A. January, 2000
TM
OPA688
OPA688
2.5
2.0
1.5
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
LIMITED OUTPUT RESPONSE
V
IN
V
O
Time (200ns/div)
Input and Output Voltage (V)
V
H
= V
L
= 2.0V
G = +2
2.10
2.05
2.00
1.95
1.90
1.85
1.80
1.75
1.70
1.65
1.60
DETAIL OF LIMITED OUTPUT VOLTAGE
Time (50ns/div)
V
O
Output Voltage (V)
For most current data sheet and other product
information, visit www.burr-brown.com
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/ Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
2
OPA688
AC PERFORMANCE (see Figure 1)
Small Signal Bandwidth
V
O
< 0.2Vp-p
G = +1, R
F
= 25
530
--
--
--
MHz
Typ
C
G = +2
260
150
140
135
MHz
Min
B
G = 1
230
--
--
--
MHz
Typ
C
Gain-Bandwidth Product (G
+5)
V
O
< 0.2Vp-p
290
175
170
160
MHz
Min
B
Gain Peaking
G = +1, R
F
= 25
, V
O
< 0.2Vp-p
11
--
--
--
dB
Typ
C
0.1dB Gain Flatness Bandwidth
V
O
< 0.2Vp-p
50
--
--
--
MHz
Typ
C
Large Signal Bandwidth
V
O
= 4Vp-p, V
H
= V
L
= 2.5V
145
100
95
90
MHz
Min
B
Step Response:
Slew Rate
4V Step, V
H
= V
L
= 2.5V
1000
800
770
650
V/
s
Min
B
Rise/Fall Time
0.2V Step
1.2
2.6
2.7
3
ns
Max
B
Settling Time: 0.05%
2V Step
7
--
--
--
ns
Typ
C
Spurious Free Dynamic Range
f = 5MHz, V
O
= 2Vp-p
66
62
58
53
dB
Min
B
Differential Gain
NTSC, PAL, R
L
= 500
0.02
--
--
--
%
Typ
C
Differential Phase
NTSC, PAL, R
L
= 500
0.01
--
--
--
Typ
C
Input Noise:
Voltage Noise Density
f
1MHz
6.3
7.2
7.8
8
nV/
Hz
Max
B
Current Noise Density
f
1MHz
2.0
2.5
2.9
3.6
pA/
Hz
Max
B
DC PERFORMANCE (V
CM
= 0)
Open Loop Voltage Gain (A
OL
)
V
O
=
0.5V
52
46
44
43
dB
Min
A
Input Offset Voltage
2
6
7
9
mV
Max
A
Average Drift
--
--
14
14
V/
C
Max
B
Input Bias Current
(3)
+6
12
13
20
A
Max
A
Average Drift
--
--
60
90
nA/
C
Max
B
Input Offset Current
0.3
2
3
4
A
Max
A
Average Drift
--
--
10
10
nA/
C
Max
B
INPUT
Common-Mode Rejection
Input Referred, V
CM
=
0.5V
57
50
49
47
dB
Min
A
Common-Mode Input Range
(4)
3.3
3.2
3.2
3.1
V
Min
A
Input Impedance
Differential-Mode
0.4 || 1
--
--
--
M
|| pF
Typ
C
Common-Mode
1 || 1
--
--
--
M
|| pF
Typ
C
OUTPUT
V
H
= V
L
= 4.3V
Output Voltage Range
R
L
500
4.1
3.9
3.9
3.8
V
Min
A
Current Output, Sourcing
V
O
= 0
105
90
85
80
mA
Min
A
Sinking
V
O
= 0
85
70
65
60
mA
Min
A
Closed-Loop Output Impedance
G = +1, R
F
= 25
, f < 100kHz
0.2
--
--
--
Typ
C
POWER SUPPLY
Operating Voltage, Specified
5
--
--
--
V
Typ
C
Maximum
--
6
6
6
V
Max
A
Quiescent Current, Maximum
15.8
17
19
20
mA
Max
A
Minimum
15.8
14
12.8
11
mA
Min
A
Power Supply Rejection Ratio
+V
S
= 4.5V to 5.5V
+PSR (Input Referred)
65
58
57
55
dB
Min
A
OUTPUT VOLTAGE LIMITERS
Pins 5 and 8
Default Limit Voltage
Limiter Pins Open
3.3
3.0
3.0
2.9
V
Min
A
Minimum Limiter Separation (V
H
V
L
)
200
200
200
200
mV
Min
B
Maximum Limit Voltage
--
4.3
4.3
4.3
V
Max
B
Limiter Input Bias Current Magnitude
(5)
V
O
= 0
Maximum
54
65
68
70
A
Max
A
Minimum
54
35
34
31
A
Min
A
Average Drift
--
--
40
45
nA/
C
Max
B
Limiter Input Impedance
2 || 1
--
--
--
M
|| pF
Typ
C
Limiter Feedthrough
(6)
f = 5MHz
60
--
--
--
dB
Typ
C
DC Performance in Limit Mode
V
IN
=
2V
Limiter Offset
(V
O
V
H
) or (V
O
V
L
)
15
35
40
40
mV
Max
A
Op Amp Input Bias Current Shift
(3)
3
--
--
--
A
Typ
C
AC Performance in Limit Mode
Limiter Small Signal Bandwidth
V
IN
=
2V, V
O
< 0.02Vp-p
450
--
--
--
MHz
Typ
C
Limiter Slew Rate
(7)
100
--
--
--
V/
s
Typ
C
Limited Step Response
2x Overdrive
Overshoot
V
IN
= 0 to
2V Step
250
--
--
--
mV
Typ
C
Recovery Time
V
IN
=
2V to 0V Step
2.4
2.8
3.0
3.2
ns
Max
B
Linearity Guardband
(8)
f = 5MHz, V
O
= 2Vp-p
30
--
--
--
mV
Typ
C
SPECIFICATIONS-- V
S
=
5V
G = +2, R
L
= 500
, R
F
= 402
, V
H
= V
L
= 2V (Figure 1 for AC performance only), unless otherwise noted.
OPA688U, P
TYP
GUARANTEED
(1)
0
C to
40
C to
MIN/
TEST
PARAMETER
CONDITIONS
+25
C
+25
C
+70
C
+85
C
UNITS
MAX
LEVEL
(2)
3
OPA688
THERMAL CHARACTERISTICS
Temperature Range
Specification: P, U
40 to +85
--
--
--
C
Typ
C
Thermal Resistance
Junction-to-Ambient
P
8-Pin DIP
100
--
--
--
C/W
Typ
C
U
8-Pin SO-8
125
--
--
--
C/W
Typ
C
NOTES: (1) Junction Temperature = Ambient Temperature for low temperature limit and 25
C guaranteed specifications. Junction Temperature = Ambient Temperature
+ 23
C at high temperature limit guaranteed specifications. (2) 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 for information only. (3) Current is considered positive out of node. (4) CMIR tested as < 3dB
degradation from minimum CMRR at specified limits. (5) I
VH
(V
H
bias current) is positive, and I
VL
(V
L
bias current) is negative, under these conditions. See Note 3,
Figure 1 and Figure 8 . (6) Limiter feedthrough is the ratio of the output magnitude to the sinewave added to V
H
(or V
L
) when V
IN
= 0. (7) V
H
slew rate conditions are:
V
IN
= +2V, G = +2, V
L
= 2V, V
H
= step between 2V and 0V. V
L
slew rate conditions are similar. (8) Linearity Guardband is defined for an output sinusoid (f = 5MHz,
V
O
= 0V
DC
1Vp-p) centered between the limiter levels (V
H
and V
L
). It is the difference between the limiter level and the peak output voltage where SFDR decreases
by 3dB (see Figure 9).
SPECIFICATIONS-- V
S
=
5V
(CONT)
G = +2, R
L
= 500
, R
F
= 402
, V
H
= V
L
= 2V (Figure 1 for AC performance only), unless otherwise noted.
OPA688U, P
TYP
GUARANTEED
(1)
0
C to
40
C to
MIN/
TEST
PARAMETER
CONDITIONS
+25
C
+25
C
+70
C
+85
C
UNITS
MAX
LEVEL
(2)
AC PERFORMANCE (see Figure 2)
Small Signal Bandwidth
V
O
< 0.2Vp-p
G = +1, R
F
= 25
515
--
--
--
MHz
Typ
C
G = +2
240
110
105
100
MHz
Min
B
G = 1
190
--
--
--
MHz
Typ
C
Gain-Bandwidth Product (G
+5)
V
O
< 0.2Vp-p
275
130
125
120
MHz
Min
B
Gain Peaking
G = +1, R
F
= 25
, V
O
< 0.2Vp-p
10
--
--
--
dB
Typ
C
0.1dB Gain Flatness Bandwidth
V
O
< 0.2Vp-p
50
--
--
--
MHz
Typ
C
Large Signal Bandwidth
V
O
= 2Vp-p
240
110
105
100
MHz
Min
B
Step Response:
Slew Rate
2V Step
1000
800
770
650
V/
s
Min
B
Rise/Fall Time
0.2V Step
2.3
2.6
2.7
3
ns
Max
B
Settling Time: 0.05%
1V Step
12
--
--
--
ns
Typ
C
Spurious Free Dynamic Range
f = 5MHz, V
O
= 2Vp-p
64
60
56
51
dB
Min
B
Input Noise:
Voltage Noise Density
f
1MHz
6.3
7.2
7.8
8
nV/
Hz
Max
B
Current Noise Density
f
1MHz
2.0
2.5
2.9
3.6
pA/
Hz
Max
B
DC PERFORMANCE
V
CM
= 2.5V
Open Loop Voltage Gain (A
OL
)
V
O
=
0.5V
52
46
44
43
dB
Min
A
Input Offset Voltage
2
6
7
9
mV
Max
A
Average Drift
--
--
14
14
V/
C
Max
B
Input Bias Current
(3)
+6
12
13
20
A
Max
A
Average Drift
--
--
60
90
nA/
C
Max
B
Input Offset Current
0.3
2
3
4
A
Max
A
Average Drift
--
--
10
10
nA/
C
Max
B
SPECIFICATIONS -- V
S
= +5V
G = +2, R
L
= 500
tied to V
CM
= 2.5V, R
F
= 402
, V
L
= V
CM
1.2V, V
H
= V
CM
+1.2V (Figure 2 for AC performance only), unless otherwise noted.
OPA688U, P
TYP
GUARANTEED
(1)
0
C to
40
C to
MIN/
TEST
PARAMETER
CONDITIONS
+25
C
+25
C
+70
C
+85
C
UNITS
MAX
LEVEL
(2)
4
OPA688
INPUT
Common-Mode Rejection
Input Referred, V
CM
=
0.5V
55
48
47
45
dB
Min
A
Common-Mode Input Range
(4)
V
CM
0.8
V
CM
0.7
V
CM
0.7
V
CM
0.6
V
Min
A
Input Impedance
Differential-Mode
0.4 || 1
--
--
--
M
|| pF
Typ
C
Common-Mode
1 || 1
--
--
--
M
|| pF
Typ
C
OUTPUT
V
H
= V
CM
+1.8V, V
L
= = V
CM
1.8V
Output Voltage Range
R
L
500
V
CM
1.6
V
CM
1.4
V
CM
1.4
V
CM
1.3
V
Min
A
Current Output, Sourcing
V
O
= 2.5V
70
60
55
50
mA
Min
A
Sinking
V
O
= 2.5V
60
50
45
40
mA
Min
A
Closed-Loop Output Impedance
G = +1, R
F
= 25
, f < 100kHz
0.2
--
--
--
Typ
C
POWER SUPPLY
Single Supply Operation
Operating Voltage, Specified
+5
--
--
--
V
Typ
C
Maximum
--
+12
+12
+12
V
Max
A
Quiescent Current, Maximum
13
15
15
16
mA
Max
A
Minimum
13
11
10
9
mA
Min
A
Power Supply Rejection Ratio
V
S
= 4.5V to 5.5V
+PSR (Input Referred)
65
--
--
--
dB
Typ
C
OUTPUT VOLTAGE LIMITERS
Pins 5 and 8
Default Limiter Voltage
Limiter Pins Open
V
CM
0.9
V
CM
0.6
V
CM
0.6
V
CM
0.6
V
Min
A
Minimum Limiter Separation (V
H
V
L
)
200
200
200
200
mV
Min
B
Maximum Limit Voltage
--
V
CM
1.8
V
CM
1.8
V
CM
1.8
V
Max
B
Limiter Input Bias Current Magnitude
(5)
V
O
= 2.5V
Maximum
35
65
75
85
A
Max
A
Minimum
35
0
0
0
A
Min
A
Average Drift
--
--
30
50
nA/
C
Max
B
Limiter Input Impedance
2 || 1
--
--
--
M
|| pF
Typ
C
Limiter Feedthrough
(6)
f = 5MHz
60
--
--
--
dB
Typ
C
DC Performance in Limit Mode
V
IN
= V
CM
1.2V
Limiter Voltage Accuracy
(V
O
V
H
) or (V
O
V
L
)
15
35
40
40
mV
Max
A
Op Amp Bias Current Shift
(3)
5
--
--
--
A
Typ
C
AC Performance in Limit Mode
Limiter Small Signal Bandwidth
V
IN
= V
CM
1.2V, V
O
< 0.02Vp-p
300
--
--
--
MHz
Typ
C
Limiter Slew Rate
(7)
20
--
--
--
V/
s
Typ
C
Limited Step Response
2x Overdrive
Overshoot
V
IN
= V
CM
to V
CM
1.2V Step
55
--
--
--
mV
Typ
C
Recovery Time
V
IN
= V
CM
1.2V to V
CM
Step
15
--
--
--
ns
Max
C
Linearity Guardband
(8)
f = 5MHz, V
O
= 2Vp-p
30
--
--
--
mV
Max
C
THERMAL CHARACTERISTICS
Temperature Range
Specification: P, U
40 to +85
--
--
--
C
Typ
C
Thermal Resistance
Junction-to-Ambient
P
8-Pin DIP
100
--
--
--
C/W
Typ
C
U
8-Pin SO-8
125
--
--
--
C/W
Typ
C
NOTES: (1) Junction Temperature = Ambient Temperature for low temperature limit and 25
C guaranteed specifications. Junction Temperature = Ambient
Temperature + 23
C at high temperature limit guaranteed specifications. (2) 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 for information only. (3) Current is considered positive out of node. (4) CMIR
tested as < 3dB degradation from minimum CMRR at specified limits. (5) I
VH
(V
H
bias current) is negative, and I
VL
(V
L
bias current) is positive, under these conditions.
See Note 3, Figures 2, and Figure 8. (6) Limiter feedthrough is the ratio of the output magnitude to the sinewave added to V
H
(or V
L
) when V
IN
= 0. (7) V
H
slew
rate conditions are: V
IN
= V
CM
+0.4V, G = +2, V
L
= V
CM
1.2V, V
H
= step between V
CM
+ 1.2V and V
CM
. V
L
slew rate conditions are similar. (8) Linearity Guardband
is defined for an output sinusoid (f = 5MHz, V
O
= V
CM
1Vp-p) centered between the limiter levels (V
H
and V
L
). It is the difference between the limiter level and the
peak output voltage where SFDR decreases by 3dB (see Figure 9).
SPECIFICATIONS-- V
S
= +5V
(CONT)
G = +2, R
L
= 500
tied to V
CM
= 2.5V, R
F
= 402
, V
L
= 1.2V, V
H
= +1.2V (Figure 2 for AC performance only), unless otherwise noted.
OPA688U, P
TYP
GUARANTEED
(1)
0
C to
40
C to
MIN/
TEST
PARAMETER
CONDITIONS
+25
C
+25
C
+70
C
+85
C
UNITS
MAX
LEVEL
(2)
5
OPA688
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .................................................................................
6.5V
Internal Power Dissipation .......................... See Thermal Characteristics
Common-Mode Input Voltage .............................................................
V
S
Differential Input Voltage .....................................................................
V
S
Limiter Voltage Range ...........................................................
(V
S
0.7V)
Storage Temperature Range: P, U ................................ 40
C to +125
C
Lead Temperature (DIP, soldering, 10s) ..................................... +300
C
(SO-8, soldering, 3s) ...................................... +260
C
Junction Temperature .................................................................... +175
C
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 CONFIGURATION
Top View
DIP-8, SO-8
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from perfor-
mance degradation to complete device failure. Burr-Brown Corpo-
ration 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.
1
2
3
4
8
7
6
5
NC
Inverting Input
Non-Inverting Input
V
S
V
H
+V
S
Output
V
L
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
RANGE
MARKING
NUMBER
(1)
MEDIA
OPA688P
DIP-8 Plastic DIP
006
40
C to +85
C
OPA688P
OPA688P
Rails
OPA688U
SO-8 Surface Mount
182
40
C to +85
C
OPA688U
OPA688U
Rails
"
"
"
"
"
OPA688U/2K5
Tape and Reel
NOTES: (1) Models with a slash (/ ) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of OPA688U/2K5" will get a single 2500-piece Tape and Reel.
PACKAGE/ORDERING INFORMATION