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AD790 Datenblatt(PDF) 7 Page - Analog Devices

Teilenummer AD790
Bauteilbeschribung  Fast, Precision Comparator
Download  12 Pages
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD790 Datenblatt(HTML) 7 Page - Analog Devices

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AD790
REV. D
–7–
AD790
1
2
3
4
5
6
7
8
+IN
–IN
5V
+
OUT
510
+ 12V
0.1µF
0.1µF
+V
S = +12V, –VS = 0V
V
LOGIC = +5V
AD790
1
2
3
4
5
6
7
8
5V
+
OUT
15V
0.1µF
0.1µF
+V
S = +5V, –VS = –15V
V
LOGIC = +5V
+IN
–IN
AD790
1
2
3
4
5
6
7
8
5V
+
OUT
5V
0.1µF
0.1µF
+IN
–IN
+V
S = +5V, –VS = –5V, VLOGIC = +5V
Figure 7. Typical Power Supply Connections
(N, Q Package Pinout)
Window Comparator for Overvoltage Detection
The wide differential input range of the AD790 makes it suitable
for monitoring large amplitude signals. The simple overvoltage
detection circuit shown in Figure 8 illustrates direct connection
of the input signal to the high impedance inputs of the comparator
without the need for special clamp diodes to limit the differen-
tial
input voltage across the inputs.
510
OVERRANGE = 1
7432
AD790
1
2
3
4
5
6
7
8
+15V
+5V
–15V
AD790
1
2
3
4
5
6
7
8
+15V
+5V
–15V
VIN
510
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
SIGN 1 = HIGH
0 = LOW
–7.5V
+7.5V
Figure 8. Overvoltage Detector
(N, Q Package Pinout)
Single Supply Ground Referred Overload Detector
The AD790 is useful as an overload detector for sensitive loads
that must be powered from a single supply. A simple ground
referenced overload detector is shown in Figure 8. The com-
parator senses a voltage across a PC board trace and compares
that to a reference (trip) voltage established by the comparator’s
minus supply current through a 2.7
Ω resistor. This sets up a
10 mV reference level that is compared to the sense voltage.
Applying the
–7–
The minus supply current is proportional to absolute tempera-
ture and compensates for the change in the sense resistance
with temperature. The width and length of the PC board trace
determine the resistance of the trace and consequently the trip
current level.
ILIMIT = 10 mV/RSENSE
RSENSE = rho (trace length/trace width)
rho = resistance of a unit square of trace
L
O
A
D
2.7
PC BOARD
TRACE
AD790
1
2
3
4
5
6
7
8
0.1µF
5V
+
OUTPUT
RSENSE
≈ 10mV/100mA
+VS
510
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
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 mV or as high as 10 V. Input resolution, propaga-
tion delay and op amp settling will ultimately limit the maximum
input frequency for a given accuracy level. Total comparator
plus switch delay is approximately 100 ns, which limits the
maximum input frequency to 1 MHz for clean rectification.
AD711
10k
FET SWITCHES THE GAIN
FROM +1 TO –1
20k
10k
AD790
1
2
3
4
5
6
7
8
+15V
+5V
–15V
2
3
4
6
7
+15V
–15V
VIN
VOUT
NMOS
FET
(RON < 20 )
0.1µF
510
0.1µF
0.1µF
0.1µF
0.1µF
Figure 10. Precision Full-Wave Rectifier
(N, Q Package Pinout)


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