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參數資料
| 型號： | ADCMP609BRMZ-REEL71 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Replacement for Texas Instruments part number LM107JB. Buy from authorized manufacturer Rochester Electronics. |
| 中文描述： | 軌到軌，快速，低功耗2.5 V至5.5 V，單電源TTL / CMOS電比較 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 229K |
| 代理商： | ADCMP609BRMZ-REEL71 |
ADCMP609
Propagation delay dispersion is a specification that becomes
important in high speed, time-critical applications, such as data
communication, automatic test and measurement, and instru-
mentation. It is also important in event-driven applications, such
as pulse spectroscopy, nuclear instrumentation, and medical
imaging. Dispersion is defined as the variation in propagation
delay as the input overdrive conditions are changed (see
Figure 12 and Figure 13).
ADCMP609 dispersion is typically <12 ns as the overdrive varies
from 10 mV to 125 mV. This specification applies to both
positive and negative signals because the device has very closely
matched delays for both positive-going and negative-going
inputs, and very low output skews. Remember to add the
actual device offset to the overdrive for repeatable dispersion
measurements.
Rev. 0 | Page 9 of 12
Q/Q OUTPUT
INPUT VOLTAGE
500mV OVERDRIVE
10mV OVERDRIVE
DISPERSION
V
N
± V
OS
0
Figure 12. Propagation Delay—Overdrive Dispersion
Q/Q OUTPUT
INPUT VOLTAGE
10V/ns
1V/ns
DISPERSION
V
N
± V
OS
0
Figure 13. Propagation Delay—Slew Rate Dispersion
COMPARATOR HYSTERESIS
The addition of hysteresis to a comparator is often desirable in
a noisy environment, or when the differential input amplitudes
are relatively small or slow moving. The transfer function for a
comparator with hysteresis is shown in Figure 14. As the input
voltage approaches the threshold (0.0 V, in this example) from
below the threshold region in a positive direction, the compara-
tor switches from low to high when the input crosses +V
H
/2. The
new switching threshold becomes V
H
/2. The comparator remains
in the high state until the threshold, V
H
/2, is crossed from
below the threshold region in a negative direction. In this manner,
noise or feedback output signals centered on 0.0 V input cannot
cause the comparator to switch states unless it exceeds the region
bounded by ±V
H
/2.
OUTPUT
INPUT
0
V
OL
V
OH
+V
H
2
–V
H
2
0
Figure 14. Comparator Hysteresis Transfer Function
The customary technique for introducing hysteresis into a
comparator uses positive feedback from the output back to
the input. One limitation of this approach is that the amount
of hysteresis varies with the output logic levels, resulting in
hysteresis that is not symmetric about the threshold. The
external feedback network can also introduce significant
parasitics that reduce high speed performance and can
even induce oscillation in some cases.
The ADCMP609 comparator offers a programmable hysteresis
feature that significantly improves accuracy and stability. Con-
necting an external pull-down resistor or a current source from
the HYS pin to GND varies the amount of hysteresis in a pre-
dictable, stable manner. Leaving the HYS pin disconnected or
driving it high removes the hysteresis. The maximum hysteresis
that can be applied using this pin is approximately 160 mV.
Figure 15 illustrates the amount of hysteresis applied as a
function of the external resistor value.
0
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
H
1300
1200
1100
1000
900
800
700
600
500
HYS RESISTOR (k
)
400
300
200
100
0
V
CC
= 5.5
V
CC
= 2.5
Figure 15. Hysteresis vs. HYS Resistor
The hysteresis control pin appears as a 1.25 V bias voltage seen
through a series resistance of 7 kΩ ± 20% throughout the hysteresis
control range. The advantages of applying hysteresis in this manner
are improved accuracy, improved stability, reduced component
count, and maximum versatility. An external bypass capacitor is
not recommended on the HYS pin because it impairs the latch
function and often degrades the jitter performance of the device.
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