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參數資料
| 型號： | ADCMP581BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Ultrafast SiGe Voltage Comparator |
| 中文描述： | COMPARATOR, 5000 uV OFFSET-MAX, QCC16 |
| 封裝： | MO-220-VEED-2, LFCSP-16 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 284K |
| 代理商： | ADCMP581BCP |
Preliminary Technical Data
ADCMP580/ADCMP581/ADCMP582
COMPARATOR HYSTERESIS
Adding hysteresis to a comparator is often desirable in a noisy
environment or when the differential inputs are very small or
slow moving. The transfer function for a comparator with
hysteresis is shown in Figure 18. If the input voltage approaches
the threshold from the negative direction, the comparator
switches from a low to a 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
coming from the positive direction. In this manner, noise
centered on 0 V input does not cause the comparator to switch
states unless it exceeds the region bounded by ±V
H
/2.
Rev. PrA | Page 11 of 16
The customary technique for introducing hysteresis into a
comparator uses positive feedback from the output back to the
input. A limitation of this approach is that the amount of
hysteresis varies with the output logic levels, resulting in
hysteresis that is not symmetric about the threshold. The
external feedback network can also introduce significant
parasitics that will reduce high speed performance, and can
even reduce overall stability in some cases.
The ADCMP58x family of comparators offers a programmable
hysteresis feature that can significantly improve the accuracy
and stability of the desired hysteresis. By connecting an external
pull-down resistor from the HYS pin to V
EE
, a variable amount
of hysteresis can be applied. Leaving the HYS pin disconnected
disables the feature and hysteresis is then less than 1 mV as
specified. The maximum range of hysteresis that can be applied
by using this method is approximately ±25 mV.
Figure 19 illustrates the amount of applied hysteresis as a
function of external resistor value. The advantage of applying
hysteresis in this manner is improved accuracy, stability, and
reduced component count. An external bypass capacitor is not
required on the HYS pin because it would likely degrade the
jitter performance of the device.
OUTPUT
INPUT
0V
0
1
+V
H
2
–V
H
2
0
Figure 18. Comparator Hysteresis Transfer Function of the
ADCMP580/ADCMP581
Figure 19. Comparator Hysteresis vs. R
HYS
Control Resistor
MINIMUM INPUT SLEW RATE REQUIREMENT
As with all high speed comparators, a minimum slew rate must
be met to ensure that the device does not oscillate when the
input signal crosses the threshold. This oscillation is due in part
to the high input bandwidth of the comparator and the
feedback parasitics inherent in the package. Analog Devices
recommends a minimum slew rate of 50 V/μs to ensure a clean
output transition from the ADCMP58x family of comparators
unless hysteresis is programmed as discussed previously.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADCMP581BCP-R2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADCMP581BCP-RL7 | 制造商:Analog Devices 功能描述:Comparator Single ±5.5V 16-Pin LFCSP EP T/R |
| ADCMP581BCP-WP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADCMP581BCPZ-R2 | 功能描述:IC COMPARATOR ECL UFAST 16-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:通用 元件數: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（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 |
| ADCMP581BCPZ-RL7 | 功能描述:IC COMPARATOR ECL UFAST 16-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:通用 元件數: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（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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