AD8598ARU-REEL

更新时间： 2024-01-08 17:34:41

品牌	Logo	应用领域
亚德诺 - ADI		比较器
页数	文件大小	规格书
11页	126K
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AD8598ARU-REEL 数据手册

AD8598

The input signal is directly connected to the noninverting input

of the comparator. The output is fed back to the inverting input

through R1 and R2. The ratio of R1 to R1 + R2 establishes the

width of the hysteresis window with V_REFsetting the center of

the window, or the average switching voltage. The Q output will

switch high when the input voltage is greater than V_HIand will

not switch low again until the input voltage is less than V_LOas

given in Equation 1:

The input bias current for the AD8598 is 3 µA. As with any

PNP differential input stage, this bias current will go to zero on

an input that is high and will double on an input that is low.

Care should be taken in choosing resistor values to be con-

nected to the inputs as large resistors could cause significant

voltage drops due to the input bias current.

The input capacitance for the AD8598 is typically 3 pF. This is

measured by inserting a 5 kΩ source resistance to the input and

measuring the change in propagation delay.

V_HI= V –1–V

+V_REF

Using Hysteresis

(

)

R1+ R2

REF

Hysteresis can easily be added to a comparator through the

addition of positive feedback. Adding hysteresis to a comparator

offers an advantage in noisy environments where it is not desir-

able for the output to toggle between states when the input

signal is near the switching threshold. Figure 17 shows a

method for configuring the AD8598 with hysteresis.

(1)

R1+ R2

V_LO=V_REF1–

where V₊is the positive supply voltage.

The capacitor, C_F,can also be added to introduce a pole into the

feedback network. This has the effect of increasing the amount of

hysteresis at high frequencies. This can be useful when comparing

a relatively slow signal in a high frequency noise environment. At

COMPARATOR

SIGNAL

REF

frequencies greater than f_P=

, the hysteresis window

2π C_FR2

approaches V_HI= V₊– 1 V and V_LO= 0 V. At frequencies less

than f_Pthe threshold voltages remain as in Equation 1.

Figure 17. Configuring the AD8598 with Hysteresis

–8–

REV. A

1...5 6 789 10 11

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