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| 型号： | AD8469WBRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR R-R TTL/CMOS 8MSOP |
| 标准包装： | 50 |
| 类型： | 通用 |
| 元件数： | 1 |
| 输出类型： | CMOS，TTL |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 5.5 V |
| 电压 - 输入偏移（最小值）： | 3mV @ 2.5V |
| 电流 - 输入偏压（最小值）： | 0.4µA @ 2.5V |
| 电流 - 输出（标准）： | 50mA |
| 电流 - 静态（最大值）： | 800µA |
| CMRR, PSRR（标准）： | 50dB CMRR，50dB PSRR |
| 传输延迟（最大）： | 40ns |
| 磁滞： | 100µV |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 安装类型： | 表面贴装 |
| 包装： | 管件 |
Data Sheet
AD8469
Rev. 0 | Page 9 of 12
Q/Q OUTPUT
INPUT VOLTAGE
500mV OVERDRIVE
10mV OVERDRIVE
DISPERSION
VN ± VOS
10490-
012
Figure 12. Propagation Delay—Overdrive Dispersion
Q/Q OUTPUT
INPUT VOLTAGE
10V/ns
1V/ns
DISPERSION
VN ± VOS
10490-
013
Figure 13. Propagation Delay—Slew Rate Dispersion
COMPARATOR HYSTERESIS
The addition of hysteresis to a comparator is often desirable in
noisy environments 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.
OUTPUT
INPUT
0.0V
VOL
VOH
+VH
2
–VH
2
10490-
014
Figure 14. Comparator Hysteresis Transfer Function
As the input voltage approaches the threshold (0.0 V in Figure 14)
from below the threshold region in a positive direction, the com-
parator switches from low to high when the input crosses +VH/2.
The new switching threshold becomes VH/2. The comparator
remains in the high state until the threshold, VH/2, is crossed
from below the threshold region in a negative direction. In this
way, noise or feedback output signals centered on the 0.0 V input
cannot cause the comparator to switch states unless they exceed
the region bounded by ±VH/2.
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 level, 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 AD8469 comparator offers a programmable hysteresis
feature that significantly improves accuracy and stability. By
connecting an external pull-down resistor or current source
from the HYS pin to ground, the user can vary the amount of
hysteresis in a predictable, stable manner. Leaving the HYS pin
disconnected or driving it high removes the hysteresis. The
maximum hysteresis that can be applied using the HYS pin is
approximately 160 mV. Figure 15 illustrates the amount of
hysteresis applied as a function of the external resistor value.
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
H
Y
S
T
E
R
E
S
IS
(m
V
)
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
HYS RESISTOR (
kΩ)
10490-
019
VCC = 5.5V
VCC = 2.5V
Figure 15. Hysteresis vs. HYS Resistor
The HYS 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.
When the HYS pin is driven low, hysteresis may become large,
but in this device, the effect is not reliable or intended as a latch
function.
CROSSOVER BIAS POINT
Rail-to-rail inputs in both op amps and comparators have a dual
front-end design. Certain devices are active near the VCC rail, and
others are active near the VEE rail. At some predetermined point
in the common-mode range, a crossover occurs. At the crossover
point (normally VCC/2), the direction of the bias current is reversed
and there are changes in measured offset voltages and currents.
The AD8469 elaborates slightly on this scheme. The crossover
points are at approximately 0.8 V and 1.6 V.
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相关代理商/技术参数 |
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| AD8469WBRMZ_PROMO | 制造商:Analog Devices 功能描述:COMPARATOR TTL / CMOS SINGLE |
| AD8469WBRMZ-RL | 功能描述:IC COMPARATOR R-R TTL/CMOS 8MSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 比较器 系列:- 标准包装:25 系列:- 类型:带电压基准 元件数:4 输出类型:CMOS，开路漏极，TTL 电压 - 电源，单路/双路(±):2 V ~ 11 V，±1 V ~ 5.5 V 电压 - 输入偏移（最小值）:10mV @ 5V 电流 - 输入偏压（最小值）:- 电流 - 输出（标准）:0.015mA @ 5V 电流 - 静态（最大值）:8.5µA CMRR, PSRR（标准）:80dB CMRR，80dB PSRR 传输延迟（最大）:12µs 磁滞:50mV 工作温度:0°C ~ 70°C 封装/外壳:16-DIP（0.300"，7.62mm） 安装类型:通孔 包装:管件 |
| AD846AH | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Feedback Operational Amplifier |
| AD846AN | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk 制造商:Rochester Electronics LLC 功能描述:450V/US,PRECISION OPAMP - Bulk 制造商:Analog Devices 功能描述:OP AMP CURRENT FEEDBACK DIP8 846 |
| AD846AQ | 制造商:AD 制造商全称:Analog Devices 功能描述:450 V/us, Precision, Current-Feedback Op Amp |
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