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a
Fast, Precision
Comparator
AD790
15 V Supply Operation
CMOS or TTL Compatible Output
250
6
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP (N)
and Cerdip (Q) Packages
m
V max Input Offset Voltage
V max Input Hysteresis Voltage
15 V max Differential Input Voltage
Onboard Latch
60 mW Power Dissipation
Available in 8-Pin Plastic and Hermetic Cerdip
Packages
MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance with
EIA-481A Standard
m
+V S
1
8
V LOGIC
AD790
+IN
2
+
7
OUTPUT
–IN
3
–
6
GROUND
–V S
4
5
LATCH
8-Pin SOIC (R) Package
APPLICATIONS
Zero-Crossing Detectors
Overvoltage Detectors
Pulse-Width Modulators
Precision Rectifiers
Discrete A/D Converters
Delta-Sigma Modulator A/Ds
OUTPUT
1
AD790
8
GROUND
V LOGIC
2
7
LATCH
+V S
3
–
6
–V S
+IN
4
5
–IN
PRODUCT DESCRIPTION
The AD790 is a fast (45 ns), precise voltage comparator, with a
number of features that make it exceptionally versatile and easy
to use. The AD790 may operate from either a single +5 V sup-
ply or a dual ± 15 V supply. In the single-supply mode, the
AD790’s inputs may be referred to ground, a feature not found
in other comparators. In the dual-supply mode it has the unique
ability of handling a maximum differential voltage of 15 V across
its input terminals, easing their interfacing to large amplitude
and dynamic signals.
This device is fabricated using Analog Devices’ Complementary
Bipolar (CB) process–which gives the AD790’s combination of
fast response time and outstanding input voltage resolution
(1 mV max). To preserve its speed and accuracy, the AD790
incorporates a “low glitch” output stage that does not exhibit
the large current spikes normally found in TTL or CMOS out-
put stages. Its controlled switching reduces power supply distur-
bances that can feed back to the input and cause undesired
oscillations. The AD790 also has a latching function which makes
it suitable for applications requiring synchronous operation.
The AD790 is available in five performance grades. The AD790J
and the AD790K are rated over the commercial temperature
range of 0°C to +70°C. The AD790A and AD790B are rated
over the industrial temperature range of –40°C to +85°C. The
AD790S is rated over the military temperature range of –55°C to
+125°C and is available processed to MIL-STD-883B, Rev. C.
PRODUCT HIGHLIGHTS
1. The AD790’s combination of speed, precision, versatility
and low cost makes it suitable as a general purpose compara-
tor in analog signal processing and data acquisition systems.
2. Built-in hysteresis and a low-glitch output stage minimize the
chance of unwanted oscillations, making the AD790 easier to
use than standard open-loop comparators.
3. The hysteresis combined with a wide input voltage range
enables the AD790 to respond to both slow, low level (e.g.,
10 mV) signals and fast, large amplitude (e.g., 10 V) signals.
4. A wide variety of supply voltages are acceptable for operation
of the AD790, ranging from single +5 V to dual +5 V/–12 V,
± 5 V, or +5 V/± 15 V supplies.
5. The AD790’s power dissipation is the lowest of any compara-
tor in its speed range.
6. The AD790’s output swing is symmetric between V LOGIC
and ground, thus providing a predictable output under a
wide range of input and output conditions.
REV. B
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
45 ns max Propagation Delay
Single +5 V or Dual
500
11023698.013.png 11023698.014.png 11023698.015.png 11023698.016.png 11023698.001.png 11023698.002.png 11023698.003.png 11023698.004.png
AD790–SPECIFICATIONS
DUAL SUPPLY
(Operation @ +25
8
C and +V S = +15 V, –V S = –15 V, V LOGIC = +5 V unless otherwise noted)
AD790J/A
AD790K/B
AD790S
Parameter
Conditions
Min Typ Max
Min Typ Max
Min Typ Max
Units
RESPONSE CHARACTERISTIC 100 mV Step
Propagation Delay, t PD
5 mV Overdrive
40
45
40
45
40
45
ns
T MIN to T MAX
45/50
45/50
60
ns
OUTPUT CHARACTERISTICS
Output HIGH Voltage, V OH
1.6 mA Source
4.65
4.65
4.65
6.4 mA Source
4.3
4.45
4.3
4.45
4.3 4.45
V
T MIN to T MAX
4.3/ 4.3
4.3
4.3
V
Output LOW Voltage, V OL
1.6 mA Sink
0.35
0.35
0.35
V
6.4 mA Sink
0.44 0.5
0.44 0.5
0.44 0.5
V
T MIN to T MAX
0.5/ 0.5
0.5
0.5
V
INPUT CHARACTERISTICS
Offset Voltage 1
0.2
1.0
0.05 0.25
0.2
1.0
mV
T MIN to T MAX
1.5
0.5
1.5
mV
Hysteresis 2
T MIN to T MAX
0.3
0.4
0.6
0.3
0.4
0.5
0.3 0.4
0.65
mV
Bias Current
Either Input
2.5
5
1.8
3.5
2.5
5
m
A
T MIN to T MAX
6.5
4.5
7
m
A
Offset Current
0.04 0.25
0.02 0.15
0.04 0.25
m
A
T MIN to T MAX
0.3
0.2
0.4
m
A
Power Supply
Rejection Ratio DC
V S
±
20%
80
90
88
100
80
90
dB
T MIN to T MAX
76
88
85
93
76
85
dB
Input Voltage Range
Differential Voltage
V S
£±
15 V
6
V S
6
V S
6
V S
V
Common Mode
–V S
+V S –2 V –V S
+V S –2 V –V S
+V S –2 V V
Common Mode
Rejection Ratio
–10 V<V CM
80
95
88
105
80
95
dB
<+10 V
T MIN to T MAX
76
90
85
100
76
88
dB
Input Impedance
20
i
2
20
i
2
20
i
2
M
W i
pF
LATCH CHARACTERISTICS
Latch Hold Time, t H
25
35
25
35
25
35
ns
Latch Setup Time, t S
5
10
5
10
5
10
ns
LOW Input Level, V IL
T MIN to T MAX
0.8
0.8
0.8
V
HIGH Input Level, V IH
T MIN to T MA X
1.6
1.6
1.6
V
Latch Input Current
2.3
5
2.3
3.5
2.3
5
mA
T MIN to T MAX
7
5
8
mA
SUPPLY CHARACTERISTICS
Diff Supply Voltage 3
V LOGIC = 5 V
T MIN to T MAX
4.5
33
4.5
33
4.7
33
V
Logic Supply
T MIN to T MAX
4.0
7
4.0
7
4.2
7
V
Quiescent Current
+V S
+V S = 15 V
8
10
8
10
8
10
mA
–V S
–V S = –15 V
4
5
4
5
4
5
mA
V LOGIC
V LOGIC = 5 V
2
3.3
2
3.3
2
3.3
mA
Power Dissipation
242
242
242
mW
TEMPERATURE RANGE
Rated Performance
T MIN to T MAX
0 to +70/–40 to +85
0 to +70/–40 to +85
–55 to +125
°
C
NOTES
1 Defined as the average of the input voltages at the low to high and high to low transition points. Refer to Figure 14.
2 Defined as half the magnitude between the input voltages at the low to high and high to low transition points. Refer to Figure 14.
3 +V S must be no lower than (V LOGIC –0.5 V) in any supply operating conditions, except during power up.
All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final test.
Specifications subject to change without notice.
–2–
REV. B
11023698.005.png 11023698.006.png
AD790
SINGLE SUPPLY
(Operation @ +25
8
C and +V S = V LOGIC = +5 V, –V S = 0 V unless otherwise noted) 1
AD790J/A
AD790K/B
AD790S
Parameter
Conditions
Min Typ Max
Min Typ Max
Min Typ Max
Units
RESPONSE CHARACTERISTIC 100 mV Step
Propagation Delay, t PD
5 mV Overdrive
45
50
45
50
45
50
ns
T MIN to T MAX
50/60
50/60
65
ns
OUTPUT CHARACTERISTICS
Output HIGH Voltage, V OH
1.6 mA Source
4.65
4.65
4.65
6.4 mA Source
4.3
4.45
4.3
4.45
4.3 4.45
V
T MIN to T MAX
4.3
4.3
4.3
V
Output LOW Voltage, V OL
1.6 mA Sink
0.35
0.35
0.35
V
6.4 mA Sink
0.44 0.5
0.44 0.5
0.44 0.5
V
T MIN to T MAX
0.5
0.5
0.5
V
INPUT CHARACTERISTICS
Offset Voltage 2
0.45 1.5
0.35 0.6
0.45 1.5
mV
T MIN to T MAX
2.0
0.85
2.0
mV
Hysteresis 3
T MIN to T MAX
0.3
0.5
0.75
0.3
0.5
0.65
0.3 0.7
1.0
mV
Bias Current
Either Input
2.7
5
2.0
3.5
2.7
5
m
A
T MIN to T MAX
7
5
8
m
A
Offset Current
0.04 0.25
0.02 0.15
0.04 0.25
m
A
T MIN to T MAX
0.3
0.2
0.4
m
A
Power Supply
Rejection Ratio DC
4.5 V
£
V S £
5.5 V
80
90
86
100
80
90
dB
T MIN to T MAX
76/ 76 88
82
93
76
85
dB
Input Voltage Range
Differential Voltage
6
V S
6
V S
6
V S
V
Common Mode
0
+V S –2 V 0
+V S –2 V 0
+V S –2 V V
Input Impedance
20
i
2
20
i
2
20
i
2
M
W i
pF
LATCH CHARACTERISTICS
Latch Hold Time, t H
25
35
25
35
25
35
ns
Latch Setup Time, t S
5
10
5
10
5
10
ns
LOW Input Level, V IL
T MIN to T MAX
0.8
0.8
0.8
V
HIGH Input Level, V IH
T MIN to T MAX
1.6
1.6
1.6
V
Latch Input Current
2.3
5
2.3
3.5
2.3
5
mA
T MIN to T MAX
7
5
8
mA
SUPPLY CHARACTERISTICS
Supply Voltage 4
T MIN to T MAX
4.5
7
4.5
7
4.7
7
V
Quiescent Current
10
12
10
12
10
12
mA
Power Dissipation
60
60
60
mW
TEMPERATURE RANGE
Rated Performance
T MIN to T MAX
0 to +70/–40 to +85
0 to +70/–40 to +85
–55 to +125
°C
NOTES
1 Pin 1 tied to Pin 8, and Pin 4 tied to Pin 6.
2 Defined as the average of the input voltages at the low to high and high to low transition points. Refer to Figure 14.
3 Defined as half the magnitude between the input voltages at the low to high and high to low transition points. Refer to Figure 14.
4 –V S must not be connected above ground.
All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final test.
Specifications subject to change without notice.
REV. B
–3–
11023698.007.png
AD790
ABSOLUTE MAXIMUM RATINGS 1, 2
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V
Internal Power Dissipation 2 . . . . . . . . . . . . . . . . . . . 500 mW
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . ± 16.5 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
(N, R) . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C
(Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . +300°C
Logic Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
Call factory for chip specifications.
NOTES
1 Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in
the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2 Thermal characteristics: plastic N-8 package:
q JA = 90
°
C/watt; ceramic Q-8
package:
q JA = 110
°
C/watt,
q JC = 30
°
C/watt. SOIC (R-8) package:
q JA = 160
°
C
watt;
q JC = 42
°
C/watt.
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Description Option
AD790JN
0°C to +70°C
Plastic DIP N-8
AD790JR
0°C to +70°C
SOIC
SO-8
AD790JR-REEL 0
°
C to +70
°
C
Reel
AD790JR-REEL7 0°C to +70°C
SOIC
R-8
AD790KN
0°C to +70°C
Plastic DIP N-8
AD790AQ
–40
°
C to +85
°
C Cerdip
Q-8
AD790BQ
–40°C to +85°C Cerdip
Q-8
AD790SQ
–55°C to +125°C Cerdip
Q-8
AD790SQ/883B –55
°
C to +125
°
C Cerdip
Q-8
AD790S Chips
–55°C to +125°C Die
+
5V
LATCH
(OPTIONAL)
0.1µF
510
W
1
+
15V
LATCH
(OPTIONAL)
+IN
2
8
0.1µF
+
5V
5
AD790
7
OUTPUT
0.1µF
6
510
W
–IN
3
1
4
+IN
2
8
5
AD790
7
OUTPUT
–IN
3
6
Figure 2. Basic Single Supply
Configuration (N, Q Package Pinout)
4
0.1µF
–
15V
0.1µF
+15V
+5V
0.1µF
Figure 1. Basic Dual Supply
Configuration (N, Q Package Pinout)
1
–100mV
1k
2
8
5
TEK
7904
SCOPE
130
W
25
W
AD790
7
0.1µF
6
3
4
–1.3V
MPS
571
0.1µF
PULSE
GENERATOR
–1.7V
–15V
HP2835
HP8112
50
W
400
W
650
W
10k
W
– 5V
VOLTAGE
SOURCE
–5mV
–5V
10
W
Figure 3. Response Time Test Circuit (N, Q Package Pinout)
–4–
REV. B
11023698.008.png 11023698.009.png 11023698.010.png 11023698.011.png
Typical Characteristics–AD790
Figure 4. Propagation Delay vs.
Overdrive
Figure 5. Propagation Delay vs.
Load Capacitance
Figure 6. Propagation Delay vs.
Fanout (LSTTL and CMOS)
0.8
0.7
0.6
TEMP = +25°C
0.5
0.4
0.3
0.2
0.1
0.0
0
2
4
6
8
10
I SINK – mA
Figure 7. Propagation Delay vs.
Source Resistance
Figure 8. Propagation Delay vs.
Temperature
Figure 9. Output Low Voltage vs.
Sink Current
t H
5.0
INPUT
0
4.9
4.8
TEMP = +25°C
4.7
t S
4.6
V IH
LATCH
4.5
V IL
4.4
t PD
4.3
V OH
OUTPUT
4.2
V OL
0
2
4
6
8
10
I SOURCE – mA
t S = SETUP TIME
t H = HOLD TIME
t PD = COMPARATOR RESPONSE TIME
Figure 10. Output High Voltage vs.
Source Current
Figure 11. Total Supply Current vs.
Temperature
Figure 12. Latch Timing
REV. B
–5–
11023698.012.png

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