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參數(shù)資料
| 型號： | AD8561AN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Ultrafast 7 ns Single Supply Comparator |
| 中文描述： | COMPARATOR, 7000 uV OFFSET-MAX, 7 ns RESPONSE TIME, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 105K |
| 代理商： | AD8561AN |
AD8561
–8–
REV. 0
INPUT STAGE AND BIAS CURRENTS
The AD8561 uses a PNP differential input stage that enables
the input common-mode range to extend all the way from the
negative supply rail to within 2.2 V of the positive supply rail.
The input common-mode voltage can be found as the average
of the voltage at the two inputs of the device. To ensure the
fastest response time, care should be taken not to allow the
input common-mode voltage to exceed either of these voltages.
The input bias current for the AD8561 is 3
μ
A. 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 AD8561 is typically 3 pF. This is
measured by inserting a 5 k
source resistance to the input and
measuring the change in propagation delay.
USING HYSTERESIS
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 AD8561 with hysteresis.
V
REF
R1
SIGNAL
COMPARATOR
R2
C
F
Figure 17. Configuring the AD8561 with Hysteresis
The input signal is connected directly 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
REF
setting the center of
the window, or the average switching voltage. The Q output will
switch high when the input voltage is greater than V
HI
and will
not switch low again until the input voltage is less than V
LO
as
given in Equation 1:
V
HI
=
V
+
–1–
V
REF
(
)
R
1
R
1
+
R
2
+
V
REF
V
LO
=
V
REF
1–
R
1
R
1
+
R
2
(1)
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 com-
paring a relatively slow signal in a high frequency noise environ-
ment. At frequencies greater than
f
P
=
1
2
π
C
F
R
2
, the hysteresis
window approaches V
HI
= V
+
– 1 V and V
LO
= 0 V. At frequen-
cies less than
f
P
the threshold voltages remain as in Equation 1.
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| AD8561ANZ | 功能描述:IC COMP 7NS ULTRA-FAST 8-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標準包裝:1 系列:- 類型:通用 元件數(shù):1 輸出類型:CMOS，開路集電極，TTL 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:7mV @ 5V 電流 - 輸入偏壓（最小值）:0.25µA @ 5V 電流 - 輸出（標準）:84mA @ 5V 電流 - 靜態(tài)（最大值）:120µA CMRR, PSRR（標準）:- 傳輸延遲（最大）:600ns 磁滯:- 工作溫度:-40°C ~ 85°C 封裝/外殼:SC-74A，SOT-753 安裝類型:表面貼裝 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1268 (CN2011-ZH PDF) 其它名稱:*LMV331M5*LMV331M5/NOPBLMV331M5CT |
| AD8561AR | 功能描述:IC COMPARATOR SNGL 7NS 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，TTL 電壓 - 電源，單路/雙路(±):2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V 電壓 - 輸入偏移（最小值）:5mV @ 5.5V 電流 - 輸入偏壓（最小值）:1pA @ 5.5V 電流 - 輸出（標準）:- 電流 - 靜態(tài)（最大值）:24µA CMRR, PSRR（標準）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:450ns 磁滯:±3mV 工作溫度:-40°C ~ 85°C 封裝/外殼:6-WFBGA，CSPBGA 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
| AD8561AR-REEL | 功能描述:IC COMP 7NS ULTRA-FAST 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，TTL 電壓 - 電源，單路/雙路(±):2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V 電壓 - 輸入偏移（最小值）:5mV @ 5.5V 電流 - 輸入偏壓（最小值）:1pA @ 5.5V 電流 - 輸出（標準）:- 電流 - 靜態(tài)（最大值）:24µA CMRR, PSRR（標準）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:450ns 磁滯:±3mV 工作溫度:-40°C ~ 85°C 封裝/外殼:6-WFBGA，CSPBGA 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
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