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參數(shù)資料
| 型號(hào)： | AD790SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Fast, Precision Comparator |
| 中文描述： | COMPARATOR, 1500 uV OFFSET-MAX, 60 ns RESPONSE TIME, CDIP8 |
| 封裝： | HERMETIC SEALED, CERDIP-8 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 211K |
| 代理商： | AD790SQ |
REV. B
–7–
AD790
1
2
3
4
5
6
7
8
+IN
–IN
5V
+
OUT
510
+12V
0.1μF
0.1μF
+V
S
= +12V, –V
S
= 0V
V
LOGIC
= +5V
AD790
1
2
3
4
5
6
7
8
5V
+
OUT
15V
–
+V
S
= +5V, –V
S
= –15V
V
LOGIC
= +5V
0.1μF
0.1μF
+IN
–IN
AD790
1
2
3
4
5
6
7
8
5V
+
OUT
5V
–
0.1μF
0.1μF
+IN
–IN
+V
S
= +5V, –V
S
= –5V, V
LOGIC
= +5V
Figure 15. Typical Power Supply Connections
(N, Q Package Pinout)
Window Comparator for Overvoltage Detection
T he wide differential input range of the AD790 makes it suit-
able for monitoring large amplitude signals. T he simple over-
voltage detection circuit shown in Figure 16 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 differential 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
V
IN
510
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
SIGN 1 = HIGH
0 = LOW
–7.5V
+7.5V
Figure 16. Overvoltage Detector
(N, Q Package Pinout)
Single Supply Ground Referred Overload Detector
T he 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 16. T he 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
resistor. T his sets up a
Applying the AD790
10 mV reference level that is compared to the sense voltage.
T he minus supply current is proportional to absolute tempera-
ture and compensates for the change in the sense resistance
with temperature. T he width and length of the PC board trace
determine the resistance of the trace and consequently the trip
current level.
I
LIMIT
= 10 mV/R
SENSE
R
SENSE
= 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
R
SENSE
≈
10mV/100mA
+V
S
510
Figure 17. Ground Referred Overload Detector Circuit
(N, Q Package Pinout)
Precision Full-Wave Rectifier
T he high speed and precision of the AD790 make it suitable for
use in the wide dynamic range full-wave rectifier shown in Fig-
ure 18. T his 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. T otal 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
V
IN
V
OUT
NMOS
FET
(R
ON
< 20 )
0.1μF
510
0.1μF
0.1μF
0.1μF
0.1μF
Figure 18. Precision Full-Wave Rectifier
(N, Q Package Pinout)
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD790SQ/883B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Fast, Precision Comparator |
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