a
FEATURES
45 ns max Propagation Delay
Single +5 V or Dual 15 V Supply Operation
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
Packages
MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance with
EIA-481A Standard
APPLICATIONS
Zero-Crossing Detectors
Overvoltage Detectors
Pulse-Width Modulators
Precision Rectifiers
Discrete A/D Converters
Delta-Sigma Modulator A/Ds
PRODUCT DESCRIPTION
+V
S
+IN
–IN
–V
S
1
Fast, Precision
Comparator
AD790
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP (N)
and Cerdip (Q) Packages
8
AD790
2
3
4
V
LOGIC
OUTPUT
GROUND
LATCH
+
–
7
6
5
8-Pin SOIC (R) Package
1
2
GROUND
LATCH
–V
S
–IN
OUTPUT
V
LOGIC
+V
S
+IN
AD790
8
7
4
+
3
–
6
5
PRODUCT HIGHLIGHTS
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.
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD [ ANALOG DEVICES ]
