AD812
a
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.
Dual, Current Feedback
Low Power Op Amp
PIN CONFIGURATION
8-Lead Plastic
Mini-DIP and SOIC
OUT1
IN1
+IN1
V+
OUT2
IN2
+IN2
V
AD812
+
+
4
3
2
1
5
6
7
8
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1998
REV. B
FEATURES
Two Video Amplifiers in One 8-Lead SOIC Package
Optimized for Driving Cables in Video Systems
Excellent Video Specifications (R
L
= 150 ):
Gain Flatness 0.1 dB to 40 MHz
0.02% Differential Gain Error
0.02 Differential Phase Error
Low Power
Operates on Single +3 V Supply
5.5 mA/Amplifier Max Power Supply Current
High Speed
145 MHz Unity Gain Bandwidth (3 dB)
1600 V/ s Slew Rate
Easy to Use
50 mA Output Current
Output Swing to 1 V of Rails (150 Load)
APPLICATIONS
Video Line Driver
Professional Cameras
Video Switchers
Special Effects
PRODUCT DESCRIPTION
The AD812 is a low power, single supply, dual video amplifier.
Each of the amplifiers have 50 mA of output current and are
optimized for driving one back-terminated video load (150
)
each. Each amplifier is a current feedback amplifier and fea-
tures gain flatness of 0.1 dB to 40 MHz while offering differen-
tial gain and phase error of 0.02% and 0.02
. This makes the
AD812 ideal for professional video electronics such as cameras
and video switchers.
0.1
0.6
1M
100M
10M
0.2
0.3
0.4
0.5
0
0.1
NORMALIZED GAIN dB
100k
FREQUENCY Hz
0.2
0.3
0.4
G = +2
R
L
= 150
5V
3V
V
S
= 15V
5V
Figure 1. Fine-Scale Gain Flatness vs. Frequency, Gain
= +2, R
L
= 150
The AD812 offers low power of 4.0 mA per amplifier max (V
S
=
+5 V) and can run on a single +3 V power supply. The outputs
of each amplifier swing to within one volt of either supply rail to
easily accommodate video signals of 1 V p-p. Also, at gains of
+2 the AD812 can swing 3 V p-p on a single +5 V power sup-
ply. All this is offered in a small 8-lead plastic DIP or 8-lead
SOIC package. These features make this dual amplifier ideal
for portable and battery powered applications where size and
power is critical.
The outstanding bandwidth of 145 MHz along with 1600 V/
s
of slew rate make the AD812 useful in many general purpose
high speed applications where a single +5 V or dual power sup-
plies up to
15 V are available. The AD812 is available in the
industrial temperature range of 40
C to +85
C.
15
0.06
0.02
6
0.04
5
0.08
14
12
11
10
13
9
8
7
SUPPLY VOLTAGE Volts
DIFFERENTIAL PHASE Degrees
0.06
0.02
0.04
DIFFERENTIAL GAIN %
0
DIFFERENTIAL GAIN
DIFFERENTIAL PHASE
Figure 2. Differential Gain and Phase vs. Supply Voltage,
Gain = +2, R
L
= 150
Model
AD812A
Conditions
V
S
Min
Typ
Max
Units
DYNAMIC PERFORMANCE
3 dB Bandwidth
G = +2, No Peaking
5 V
50
65
MHz
15 V
75
100
MHz
Gain = +1
15 V
100
145
MHz
Bandwidth for 0.1 dB Flatness
G = +2
5 V
20
30
MHz
15 V
25
40
MHz
Slew Rate
1
G = +2, R
L
= 1 k
5 V
275
425
V/
s
20 V Step
15 V
1400
1600
V/
s
G = 1, R
L
= 1 k
5 V
250
V/
s
15 V
600
V/
s
Settling Time to 0.1%
G = 1, R
L
= 1 k
V
O
= 3 V Step
5 V
50
ns
V
O
= 10 V Step
15 V
40
ns
NOISE/HARMONIC PERFORMANCE
Total Harmonic Distortion
f
C
= 1 MHz, R
L
= 1 k
15 V
90
dBc
Input Voltage Noise
f = 10
kHz
5 V,
15 V
3.5
nV/
Hz
Input Current Noise
f = 10 kHz, +In
5 V,
15 V
1.5
pA/
Hz
f = 10 kHz, In
5 V,
15 V
18
pA/
Hz
Differential Gain Error
NTSC, G = +2, R
L
= 150
5 V
0.05
0.1
%
15 V
0.02
0.06
%
Differential Phase Error
5 V
0.07
0.15
Degrees
15 V
0.02
0.06
Degrees
DC PERFORMANCE
Input Offset Voltage
5 V,
15 V
2
5
mV
T
MIN
T
MAX
12
mV
Offset Drift
5 V,
15 V
15
V/
C
Input Bias Current
5 V,
15 V
7
25
A
T
MIN
T
MAX
38
A
+Input Bias Current
5 V,
15 V
0.3
1.5
A
T
MIN
T
MAX
2.0
A
Open-Loop Voltage Gain
V
O
=
2.5 V, R
L
= 150
5 V
68
76
dB
T
MIN
T
MAX
69
dB
V
O
=
10 V, R
L
= 1 k
15 V
76
82
dB
T
MIN
T
MAX
75
dB
Open-Loop Transresistance
V
O
=
2.5 V, R
L
= 150
5 V
350
550
k
T
MIN
T
MAX
270
k
V
O
=
10 V, R
L
= 1 k
15 V
450
800
k
T
MIN
T
MAX
370
k
INPUT CHARACTERISTICS
Input Resistance
+Input
15 V
15
M
Input
65
Input Capacitance
+Input
1.7
pF
Input Common Mode
5 V
4.0
V
Voltage Range
15 V
13.5
V
Common-Mode Rejection Ratio
Input Offset Voltage
V
CM
=
2.5 V
5 V
51
58
dB
Input Current
2
3.0
A/V
+Input Current
0.07
0.15
A/V
Input Offset Voltage
V
CM
=
12 V
15 V
55
60
dB
Input Current
1.5
3.3
A/V
+Input Current
0.05
0.15
A/V
(@ T
A
= +25 C, R
L
= 150
, unless otherwise noted)
Dual Supply
AD812SPECIFICATIONS
2
REV. B
Model
AD812A
Conditions
V
S
Min
Typ
Max
Units
OUTPUT CHARACTERISTICS
Output Voltage Swing
R
L
= 150
, T
MIN
T
MAX
5 V
3.5
3.8
V
R
L
= 1 k
, T
MIN
T
MAX
15 V
13.6
14.0
V
Output Current
5 V
30
40
mA
15 V
40
50
mA
Short Circuit Current
G = +2, R
F
= 715
15 V
100
mA
V
IN
= 2 V
Output Resistance
Open-Loop
15 V
15
MATCHING CHARACTERISTICS
Dynamic
Crosstalk
G = +2, f = 5 MHz
5 V,
15 V
75
dB
Gain Flatness Match
G = +2, f = 40 MHz
15 V
0.1
dB
DC
Input offset Voltage
T
MIN
T
MAX
5 V,
15 V
0.5
3.6
mV
Input Bias Current
T
MIN
T
MAX
5 V,
15 V
2
25
A
POWER SUPPLY
Operating Range
1.2
18
V
Quiescent Current
Per Amplifier
5 V
3.5
4.0
mA
15 V
4.5
5.5
mA
T
MIN
T
MAX
15 V
6.0
mA
Power Supply Rejection Ratio
Input Offset Voltage
V
S
=
1.5 V to
15 V
70
80
dB
Input Current
0.3
0.6
A/V
+Input Current
0.005
0.05
A/V
NOTES
1
Slew rate measurement is based on 10% to 90% rise time in the specified closed-loop gain.
Specifications subject to change without notice.
Single Supply
Model
AD812A
Conditions
V
S
Min
Typ
Max
Units
DYNAMIC PERFORMANCE
3 dB Bandwidth
G = +2, No Peaking
+5 V
35
50
MHz
+3 V
30
40
MHz
Bandwidth for 0.1 dB
Flatness
G = +2
+5 V
13
20
MHz
+3 V
10
18
MHz
Slew Rate
1
G = +2, R
L
= 1 k
+5 V
125
V/
s
+3 V
60
V/
s
NOISE/HARMONIC PERFORMANCE
Input Voltage Noise
f = 10
kHz
+5 V, +3 V
3.5
nV/
Hz
Input Current Noise
f = 10 kHz, +In
+5 V, +3 V
1.5
pA/
Hz
f = 10 kHz, In
+5 V, +3 V
18
pA/
Hz
Differential Gain Error
2
NTSC, G = +2, R
L
= 150
+5 V
0.07
%
G = +1
+3 V
0.15
%
Differential Phase Error
2
G = +2
+5 V
0.06
Degrees
G = +1
+3 V
0.15
Degrees
AD812
REV. B
3
(@ T
A
= +25 C, R
L
= 150 , unless otherwise noted)
AD812A
Model
Conditions
V
S
Min
Typ
Max
Units
DC PERFORMANCE
Input Offset Voltage
+5 V, +3 V
1.5
4.5
mV
T
MIN
T
MAX
7.0
mV
Offset Drift
+5 V, +3 V
7
V/
C
Input Bias Current
+5 V, +3 V
2
20
A
T
MIN
T
MAX
30
A
+Input Bias Current
+5 V, +3 V
0.2
1.5
A
T
MIN
T
MAX
2.0
A
Open-Loop Voltage Gain
V
O
= +2.5 V p-p
+5 V
67
73
dB
V
O
= +0.7 V p-p
+3 V
70
dB
Open-Loop Transresistance
V
O
= +2.5 V p-p
+5 V
250
400
k
V
O
= +0.7 V p-p
+3 V
300
k
INPUT CHARACTERISTICS
Input Resistance
+Input
+5 V
15
M
Input
+5 V
90
Input Capacitance
+Input
2
pF
Input Common Mode
+5 V
1.0
4.0
V
Voltage Range
+3 V
1.0
2.0
V
Common-Mode Rejection Ratio
Input Offset Voltage
V
CM
= 1.25 V to 3.75 V
+5 V
52
55
dB
Input Current
3
5.5
A/V
+Input Current
0.1
0.2
A/V
Input Offset Voltage
V
CM
= 1 V to 2 V
+3 V
52
dB
Input Current
3.5
A/V
+Input Current
0.1
A/V
OUTPUT CHARACTERISTICS
Output Voltage Swing p-p
R
L
= 1 k
, T
MIN
T
MAX
+5 V
3.0
3.2
V p-p
R
L
= 150
, T
MIN
T
MAX
+5 V
2.8
3.1
V p-p
+3 V
1.0
1.3
V p-p
Output Current
+5 V
20
30
mA
+3 V
15
25
mA
Short Circuit Current
G = +2, R
F
= 715
+5 V
40
mA
V
IN
= 1 V
MATCHING CHARACTERISTICS
Dynamic
Crosstalk
G = +2, f = 5 MHz
+5 V, +3 V
72
dB
Gain Flatness Match
G = +2, f = 20 MHz
+5 V, +3 V
0.1
dB
DC
Input offset Voltage
T
MIN
T
MAX
+5 V, +3 V
0.5
3.5
mV
Input Bias Current
T
MIN
T
MAX
+5 V, +3 V
2
25
A
POWER SUPPLY
Operating Range
2.4
36
V
Quiescent Current
Per Amplifier
+5 V
3.2
4.0
mA
+3 V
3.0
3.5
mA
T
MIN
T
MAX
+5 V
4.5
mA
Power Supply Rejection Ratio
Input Offset Voltage
V
S
= +3 V to +30 V
70
80
dB
Input Current
0.3
0.6
A/V
+Input Current
0.005
0.05
A/V
TRANSISTOR COUNT
56
NOTES
1
Slew rate measurement is based on 10% to 90% rise time in the specified closed-loop gain.
2
Single supply differential gain and phase are measured with the ac coupled circuit of Figure 53.
Specifications subject to change without notice.
AD812SPECIFICATIONS
Single Supply (Continued)
REV. B
4
AD812
5
REV. B
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the
AD812 is limited by the associated rise in junction temperature.
The maximum safe junction temperature for the plastic encap-
sulated parts is determined by the glass transition temperature
of the plastic, about 150
C. Exceeding this limit temporarily
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 AD812 is internally short circuit protected, this may
not be sufficient to guarantee that the maximum junction tem-
perature (150 degrees) is not exceeded under all conditions. To
ensure proper operation, it is important to observe the derating
curves.
It must also be noted that in high (noninverting) gain configura-
tions (with low values of gain resistor), a high level of input
overdrive can result in a large input error current, which may
result in a significant power dissipation in the input stage. This
power must be included when computing the junction tempera-
ture rise due to total internal power.
MAXIMUM POWER DISSIPATION Watts
AMBIENT TEMPERATURE C
2.0
1.5
0
50
90
40 30 20 10
0
10
20 30
50
60
70
80
40
1.0
0.5
8-LEAD SOIC PACKAGE
8-LEAD MINI-DIP PACKAGE
T
J
= +150 C
Figure 3. Plot of Maximum Power Dissipation vs.
Temperature
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V
Internal Power Dissipation
2
Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Watts
Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 Watts
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . .
V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . .
1.2 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Storage Temperature Range N, R . . . . . . . . . 65
C to +125
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 device in free air: 8-lead plastic package:
JA
= 90
C/Watt;
8-lead SOIC package:
JA
= 150
C/Watt.
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Description
Option
AD812AN
40
C to +85
C
8-Lead Plastic DIP
N-8
AD812AR
40
C to +85
C
8-Lead Plastic SOIC SO-8
AD812AR-REEL
13" Reel
AD812AR-REEL7
7" Reel
METALIZATION PHOTO
Dimensions shown in inches and (mm).
V+
8
OUT2
7
IN2
6
2
IN1
3
+IN1
4
V
1
OUT1
5 +IN2
4 V
0.0783
(1.99)
0.0539
(1.37)
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 AD812 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.
WARNING!
ESD SENSITIVE DEVICE
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