AD790 Analog Devices, Inc., AD790 Datasheet

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AD790

Manufacturer Part Number
AD790
Description
Fast, Precision Comparator
Manufacturer
Analog Devices, Inc.
Datasheet

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a
REV. D
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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 supply
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 in-
put 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 output
stages. Its controlled switching reduces power supply disturbances
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 tem-
perature 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.
FEATURES
45 ns max Propagation Delay
Single 5 V or Dual
CMOS or TTL Compatible Output
250 V max Input Offset Voltage
500 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
Available in Tape and Reel in Accordance with
APPLICATIONS
Zero-Crossing Detectors
Overvoltage Detectors
Pulse-Width Modulators
Precision Rectifiers
Discrete A/D Converters
Delta-Sigma Modulator A/Ds
Packages
EIA-481A Standard
15 V Supply Operation
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
PRODUCT HIGHLIGHTS
1. The AD790’s combination of speed, precision, versatility
2. Built-in hysteresis and a low-glitch output stage minimize the
3. The hysteresis combined with a wide input voltage range
4. A wide variety of supply voltages is acceptable for operation
5. The AD790’s power dissipation is the lowest of any compara-
6. The AD790’s output swing is symmetric between V
and low cost makes it suitable as a general purpose compara-
tor in analog signal processing and data acquisition systems.
chance of unwanted oscillations, making the AD790 easier to
use than standard open-loop comparators.
enables the AD790 to respond to both slow, low level (e.g.,
10 mV) signals and fast, large amplitude (e.g., 10 V) signals.
of the AD790, ranging from single 5 V to dual +5 V/–12 V,
± 5 V, or +5 V/± 15 V supplies.
tor in its speed range.
and ground, thus providing a predictable output under a
wide range of input and output conditions.
OUTPUT
V
LOGIC
+V
–V
+V
+IN
–IN
+IN
S
S
S
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP (N)
and Cerdip (Q) Packages
1
2
3
4
2
3
4
8-Pin SOIC (R) Package
1
+
AD790
Fast, Precision
AD790
© Analog Devices, Inc., 2002
Comparator
8
7
6
5
6
8
7
5
OUTPUT
GROUND
LATCH
V
LOGIC
AD790
GROUND
LATCH
–IN
–V
www.analog.com
S
LOGIC

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AD790 Summary of contents

Page 1

... AD790 to respond to both slow, low level (e.g., 10 mV) signals and fast, large amplitude (e.g signals wide variety of supply voltages is acceptable for operation of the AD790, ranging from single dual +5 V/–12 V, ± V/± supplies. 5. The AD790’s power dissipation is the lowest of any compara- tor in its speed range. 6. The AD790’ ...

Page 2

... MAX 0.8 MAX MAX = 4.5 33 MAX to T 4.0 7 MAX = 3.3 242 70/–40 to +85 MAX –2– AD790K/B AD790S Min Typ Max Min Typ Max 45/50 60 4.65 4.65 4.3 4.45 4.3 4.45 4.3 4.3 0.35 0.35 0.44 0.5 0.44 0.5 0.5 0.5 0.05 0.25 0.2 1.0 0.5 1.5 0.3 0.4 0.5 0.3 0.4 0.65 1.8 3.5 2 ...

Page 3

... MAX – 0.8 MAX to T 1.6 1.6 MAX 2 MAX to T 4.5 7 4.5 MAX 70/– 70/–40 to +85 MAX –3– AD790 1 AD790K/B AD790S Typ Max Min Typ Max 50/60 65 4.65 4.65 4.45 4.3 4.45 4.3 0.35 0.35 0.44 0.5 0.44 0.5 0.5 0.5 0.35 0.6 0.45 1.5 0.85 2.0 0.5 0.65 0.3 0.7 1.0 2.0 3.5 2 0.02 ...

Page 4

... HP8112 Figure 3. Response Time Test Circuit (N, Q Package Pinout) Model AD790JN AD790JR AD790JR-REEL AD790JR-REEL7 0°C to 70°C AD790KN AD790AQ AD790BQ AD790SQ * Not for new designs; obsolete April 2002. For military processed devices, please refer to the standard Mi- crocircuit Drawing (SMD) available at = 90° ...

Page 5

... I – mA SOURCE TPC 7. Output High Voltage vs. Source Current REV. D Typical Performace Characteristics–AD790 TPC 2. Propagation Delay vs. Load Capacitance TPC 5. Propagation Delay vs. Temperature TPC 8. Total Supply Current vs. Temperature –5– TPC 3. Propagation Delay vs. Fanout (LSTTL and CMOS) 0.8 0.7 0.6 TEMP = +25°C ...

Page 6

... Figure 4 are followed. Pin 5 should be driven with CMOS or TTL logic levels. The output of the AD790 will respond to the input when Pin high logic level. When not in use, Pin 5 should be connected to the positive logic supply. When using dual supplies rec- ommended that a 510 Ω ...

Page 7

... Figure 9. Ground Referred Overload Detector Circuit (N, Q Package Pinout) Precision Full-Wave Rectifier The high speed and precision of the AD790 make it suitable SIGN 1 = HIGH 0 = LOW for use in the wide dynamic range full-wave rectifier shown in Figure 10. This circuit is capable of rectifying low level signals as small as a few high ...

Page 8

... TTL ence voltage level about which the line receiver would switch. LEVEL 7 The AD790 may be used in a simple circuit to provide a unique OUTPUT capability: the ability to receive a bipolar signal while powered from a single 5 V supply. Other comparators cannot perform this task. Figure 11 shows a 1 kΩ resistor in series with the input signal which is then clamped by a Schottky diode, holding the input of the comparator at 0 ...

Page 9

... SEATING 0.33 (0.0130) PLANE 0.19 (0.0075) CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN COMPLIANT TO JEDEC STANDARDS MS-012 AA –9– AD790 8-Pin Cerdip (Q-8) Package 0.50 (0.0196) 45 0.25 (0.0099 1.27 (0.0500) 0.41 (0.0160) ...

Page 10

... AD790 Revision History Location Data Sheet changed from REV REV. D. Edits to SOIC (R-8) Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 — 03/02 Data Sheet changed from REV REV. C. Edits to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Deleted METALIZATION PHOTOGRAPH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 –10– Page REV. D ...

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