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AD8500 Datasheet(PDF) 19 Page - Analog Devices

Part # AD8500
Description  22 關A, RRIO, CMOS, 18 V
Download  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8500 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
AD8546/AD8548
Rev. B | Page 19 of 24
COMPARATOR OPERATION
An op amp is designed to operate in a closed-loop configuration
with feedback from its output to its inverting input. Figure 65
shows the AD8546 configured as a voltage follower with an input
voltage that is always kept at the midpoint of the power supplies.
The same configuration is applied to the unused channel. A1 and
A2 indicate the placement of ammeters to measure supply current.
ISY+ refers to the current flowing from the upper supply rail to the
op amp, and ISY− refers to the current flowing from the op amp
to the lower supply rail.
AD8546
1/2
A1
100kΩ
100kΩ
ISY+
+VSY
VOUT
–VSY
ISY
A2
Figure 65. Voltage Follower Configuration
As expected, Figure 66 shows that in normal operating condition,
the total current flowing into the op amp is equivalent to the total
current flowing out of the op amp, where ISY+ = ISY− = 36 μA for
the AD8546 at VSY = 18 V.
0
5
10
15
20
25
30
35
40
02
4
6
8
10
12
14
16
18
VSY (V)
ISY
ISY+
Figure 66. Supply Current vs. Supply Voltage (Voltage Follower)
In contrast to op amps, comparators are designed to work in an
open-loop configuration and to drive logic circuits. Although
op amps are different from comparators, occasionally an unused
section of a dual or quad op amp is used as a comparator to save
board space and cost; however, this is not recommended.
Figure 67 and Figure 68 show the AD8546 configured as a com-
parator, with 100 kΩ resistors in series with the input pins. The
unused channel is configured as a buffer with the input voltage
kept at the midpoint of the power supplies.
AD8546
1/2
A1
100kΩ
100kΩ
ISY+
+VSY
VOUT
–VSY
ISY
A2
Figure 67. Comparator Configuration A
AD8546
1/2
A1
100kΩ
100kΩ
ISY+
+VSY
VOUT
–VSY
ISY
A2
Figure 68. Comparator Configuration B
The AD8546/AD8548 have input devices that are protected
from large differential input voltages by Diode D1 and Diode D2
(see Figure 61). These diodes consist of substrate PNP bipolar
transistors and turn on when the differential input voltage
exceeds approximately 600 mV; however, these diodes also allow
a current path from the input to the lower supply rail, resulting
in an increase in the total supply current of the system. As shown
in Figure 69, both configurations yield the same result. At 18 V
of power supply, ISY+ remains at 36 μA per dual amplifier, but
ISY− increases to 140 μA in magnitude per dual amplifier.
0
20
40
60
80
100
120
140
160
02468
10
12
14
16
18
VSY (V)
ISY
ISY+
Figure 69. Supply Current vs. Supply Voltage (AD8546 as a Comparator)


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