Datasheet > AD8469WBRMZ

AD8469WBRMZ

更新时间： 2022-10-09 09:21:39

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	254K
描述
Fast, Rail-to-Rail, Low Power, 2.5 V to 5.5 V

阅读下载

中文翻译

获取价格

数据手册
替代型号

如果您发现信息不准确，欢迎纠错

AD8469WBRMZ 数据手册

Data Sheet

AD8469

500mV OVERDRIVE

10mV OVERDRIVE

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.

INPUT VOLTAGE

± V

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.

DISPERSION

Q/Q OUTPUT

Figure 12. Propagation Delay—Overdrive Dispersion

INPUT VOLTAGE

1V/ns

± V

10V/ns

160

150

140

130

120

110

100

DISPERSION

Q/Q OUTPUT

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.

= 2.5V

= 5.5V

100 200 300 400 500 600 700 800 900 1000 1100 1200 1300

OUTPUT

HYS RESISTOR (kΩ)

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.

INPUT

0.0V

–V

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.

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 +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

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 V_H/2.

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 V_CCrail, and

others are active near the V_EErail. At some predetermined point

in the common-mode range, a crossover occurs. At the crossover

point (normally V_CC/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.

Rev. 0 | Page 9 of 12

1...6 7 8910 11 12

中文翻译

下载PDF

AD8469WBRMZ 替代型号

型号	品牌	替代类型	描述	数据表
AD8469WBRMZ	ADI	当前型号	Fast, Rail-to-Rail, Low Power, 2.5 V to 5.5 V
MAX941EUA-T	MAXIM	功能相似	High-Speed, Low-Power, 3V/5V, Rail-to-Rail, Single-Supply Comparators
AD8469WBRMZ-RL	ADI	类似代替	Fast, Rail-to-Rail, Low Power, 2.5 V to 5.5 V

与AD8469WBRMZ相关器件

型号	品牌	获取价格	描述	数据表
AD8469WBRMZ-RL	ADI	获取价格	Fast, Rail-to-Rail, Low Power, 2.5 V to 5.5 V
AD846AH	ETC	获取价格	Current-Feedback Operational Amplifier
AD846AN	ADI	获取价格	450 V/us, Precision, Current-Feedback Op Amp
AD846AQ	ADI	获取价格	450 V/us, Precision, Current-Feedback Op Amp
AD846AR-16	ADI	获取价格	450 V/us, Precision, Current-Feedback Op Amp
AD846AR-16-REEL	ADI	获取价格	450 V/us, Precision, Current-Feedback Op Amp
AD846BH	ETC	获取价格	Current-Feedback Operational Amplifier
AD846BN	ADI	获取价格	450 V/us, Precision, Current-Feedback Op Amp
AD846BQ	ADI	获取价格	450 V/us, Precision, Current-Feedback Op Amp
AD846JH	ADI	获取价格	IC IC,OP-AMP,SINGLE,BIPOLAR,CAN,8PIN,METAL, Operational Amplifier

与AD8469WBRMZ相关文章

晶闸管阳极与阴极之间加电压时控制极的电流流动分析
2024-06-05

10
探究MOS管沟道夹断后载流子传输机制及其电路设计影响
2024-06-05

9
光敏电阻的工作原理、作用及检测方法
2024-06-05

8
ENC28J60以太网控制器全面解析：特性、应用、引脚说明
2024-06-05

6

产品中心

服务支持

精选活动

关于我们

帮助中心

AD8469WBRMZ

AD8469WBRMZ 数据手册

AD8469WBRMZ 替代型号

与AD8469WBRMZ相关器件

与AD8469WBRMZ相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

AD8469WBRMZ

AD8469WBRMZ 数据手册

AD8469WBRMZ 替代型号

与AD8469WBRMZ相关器件

与AD8469WBRMZ相关文章

您还可以找

您在本页遇到什么问题？