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參數(shù)資料
| 型號(hào)： | ADCMP567 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Ultrafast Voltage Comparator |
| 中文描述： | 雙超高速電壓比較器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大小： | 362K |
| 代理商： | ADCMP567 |
ADCMP567
as the variation in propagation delay as the input overdrive
conditions are changed (Figure 4). For the ADCMP567,
overdrive dispersion is typically 35 ps as the overdrive is
changed from 100 mV to 1 V. This specification applies for
both positive and negative overdrive since the ADCMP567 has
equal delays for positive and negative going inputs.
Rev. 0 | Page 10 of 16
The 35 ps propagation delay overdrive dispersion of the
ADCMP567 offers considerable improvement of the 100 ps
dispersion of other similar series comparators.
Q OUTPUT
INPUT VOLTAGE
1.5V OVERDRIVE
20mV OVERDRIVE
DISPERSION
V
REF
± V
OS
03633-0-004
Figure 4. Propagation Delay Dispersion
COMPARATOR HYSTERESIS
The addition of hysteresis to a comparator is often useful in a
noisy environment or where it is not desirable for the com-
parator to toggle between states when the input signal is at the
switching threshold. The transfer function for a comparator
with hysteresis is shown in Figure 5. If the input voltage
approaches the threshold from the negative direction, the
comparator will switch from a 0 to a 1 when the input crosses
+V
H
/2. The new switching threshold becomes V
H
/2. The
comparator will remain in a 1 state until the threshold V
H
/2 is
crossed coming from the positive direction. In this manner,
noise centered on 0 V input will not cause the comparator to
switch states unless it exceeds the region bounded by ±V
H
/2.
Positive feedback from the output to the input is often used to
produce hysteresis in a comparator (Figure 9). The major
problem with this approach is that the amount of hysteresis
varies with the output logic levels, resulting in a hysteresis that
is not symmetrical around zero.
Another method to implement hysteresis is generated by
introducing a differential voltage between LATCH ENABLE
and LATCH ENABLE. inputs (Figure 10). Hysteresis generated
in this manner is independent of output swing and is symmetri-
cal around zero. The variation of hysteresis with input voltage is
shown in Figure 6.
OUTPUT
INPUT
0
1
0V
–V
H
2
+V
H
2
03633-0-005
Figure 5. Comparator Hysteresis Transfer Function
LATCH = LE – LEB (mV)
H
–25
0
10
20
30
40
50
60
–15
–20
–10
–5
0
5
0
Figure 6. Comparator Hysteresis Transfer Function
Using Latch Enable Input
MINIMUM INPUT SLEW RATE REQUIREMENT
As for all high speed comparators, a minimum slew rate must
be met to ensure that the device does not oscillate when the
input crosses the threshold. This oscillation is due in part to the
high input bandwidth of the comparator and the parasitics of
the package. Analog Devices recommends a slew rate of 5 V/μs
or faster to ensure a clean output transition. If slew rates less
than 5 V/μs are used, then hysteresis should be added to reduce
the oscillation.
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PDF描述 |
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| ADCMP567BCP | Dual Ultrafast Voltage Comparator |
| ADCMP572BCP-R2 | Ultrafast 3.3 V/5 V Single-Supply SiGe Comparators |
| ADCMP572BCP-RL7 | Ultrafast 3.3 V/5 V Single-Supply SiGe Comparators |
| ADCMP572BCP-WP | Ultrafast 3.3 V/5 V Single-Supply SiGe Comparators |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADCMP567BCP | 制造商:Analog Devices 功能描述:Comparator Dual -5.45V/5.25V 32-Pin LFCSP EP 制造商:Analog Devices 功能描述:IC COMPARATOR HIGH SPEED |
| ADCMP567BCPZ | 功能描述:IC COMP DUAL ULTRA-FAST 32LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標(biāo)準(zhǔn)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(biāo)準(zhǔn)）:84mA @ 5V 電流 - 靜態(tài)（最大值）:120µA CMRR, PSRR（標(biāo)準(zhǔn)）:- 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 |
| ADCMP572 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrafast 3.3 V Single-Supply Comparators |
| ADCMP572_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrafast 3.3 V/5 V Single-Supply SiGe Comparators |
| ADCMP572BCP | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrafast 3.3 V Single-Supply Comparators |
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