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參數(shù)資料
| 型號(hào)： | AD8564AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Quad 7 ns Single Supply Comparator |
| 中文描述： | QUAD COMPARATOR, 10000 uV OFFSET-MAX, 8 ns RESPONSE TIME, PDSO16 |
| 封裝： | MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 115K |
| 代理商： | AD8564AR |
AD8564
–
5
–
REV. A
V
+DIG
SUPPLY VOLTAGE
–
V
I
+
,
–
3.000
2.500
0.0002
4
12
6
8
10
2.000
1.500
1.000
0.500
T
A
= +25 C
T
A
= +85 C
T
A
=
–
40 C
Figure 10. I
+DIG
: Digital Supply Cur-
rent/Comparator vs. Supply Voltage
TEMPERATURE
–
C
I
+
,
–
2.000
1.500
0.000
–
75
–
50
150
–
25
0
25
75
100 125
50
1.000
0.500
Figure 13. I
+DIG
: Digital Supply Current/
Comparator vs. Temperature
APPLICATIONS
OPTIMIZING HIGH SPEED PERFORMANCE
As with any high speed comparator or amplifier, proper design
and layout techniques should be used to ensure optimal perfor-
mance from the AD8564. The performance limits of high speed
circuitry can easily be a result of stray capacitance, improper
ground impedance or other layout issues.
Minimizing resistance from source to the input is an important
consideration in maximizing the high speed operation of the
AD8564. Source resistance in combination with equivalent
input capacitance could cause a lagged response at the input,
thus delaying the output. The input capacitance of the AD8564
in combination with stray capacitance from an input pin to
ground could result in several picofarads of equivalent capaci-
tance. A combination of 3 k
source resistance and 5 pF of
input capacitance yields a time constant of 15 ns, which is
slower than the 5 ns capability of the AD8564. Source imped-
ances should be less than 1 k
for the best performance.
It is also important to provide bypass capacitors for the power
supply in a high speed application. A 1
μ
F electrolytic bypass
capacitor should be placed within 0.5 inches of each power
supply pin to ground. These capacitors will reduce any potential
voltage ripples from the power supply. In addition, a 10 nF
ceramic capacitor should be placed as close as possible from the
power supply pins to ground. These capacitors act as a charge
reservoir for the device during high frequency switching.
A ground plane is recommended for proper high speed perfor-
mance. This can be created by using a continuous conductive
plane over the surface of the circuit board, only allowing breaks
in the plane for necessary current paths. The ground plane
provides a low inductance ground, eliminating any potential
differences at different ground points throughout the circuit
board caused from “ground bounce.” A proper ground plane
also minimizes the effects of stray capacitance on the circuit
board.
OUTPUT LOADING CONSIDERATIONS
The AD8564 output can deliver up to 40 mA of output current
without any significant increase in propagation delay. The out-
put of the device should not be connected to more than twenty
(20) TTL input logic gates, or drive a load resistance less than
100
.
To ensure the best performance from the AD8564 it is impor-
tant to minimize capacitive loading of the output of the device.
Capacitive loads greater than 50 pF will cause ringing on the
output waveform and will reduce the operating bandwidth of
the comparator. Propagation delay will also increase with
capacitive loads above 100 pF.
TEMPERATURE
–
C
I
–
A
,
–
0.000
–
1.000
–
5.000
–
75
–
50
150
–
25
0
25
75
100 125
50
–
2.000
–
3.000
–
4.000
V
+ANA
= 5V
V
+ANA
= +5V
Figure 12. I
–
ANA
: Analog Supply Cur-
rent/Comparator vs. Temperature
TEMPERATURE
–
C
I
+
,
–
5.000
4.000
0
–
75
–
50
150
–
25
0
25
75
100 125
50
3.000
2.000
1.000
V
+ANA
= 5V
V
+ANA
= +5V
Figure 11. I
+ANA
: Analog Supply Cur-
rent/Comparator vs. Temperature
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