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參數資料
| 型號： | ADCMP553 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single Supply High Speed PECL Comparators |
| 中文描述： | 單電源高速PECL的比較 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 522K |
| 代理商： | ADCMP553 |
ADCMP551/ADCMP552/ADCMP553
Preliminary Technical Data
Propagation delay dispersion is an important specification in
critical timing applications such as ATE, bench instruments,
and nuclear instrumentation. Overdrive dispersion is defined as
the variation in propagation delay as the input overdrive condi-
tions are changed (Figure 17). For the ADCMP55x, overdrive
dispersion is typically 100 ps as the overdrive is changed from
100 mV to 1 V. This specification applies for both positive and
negative overdrive since the ADCMP55x has equal delays for
positive- and negative-going inputs.
Rev. PrB | Page 12 of 14
Q OUTPUT
INPUT VOLTAGE
1.5V OVERDRIVE
20mV OVERDRIVE
DISPERSION
V
REF
± V
OS
0
Figure 17. 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
comparator 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 18. If the input voltage
approaches the threshold from the negative direction, the
comparator switches from a 0 to a 1 when the input crosses
+V
H
/2. The new switching threshold becomes V
H
/2. The
comparator remains in a 1 state until the V
H
/2 threshold 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.
Positive feedback from the output to the input is often used to
produce hysteresis in a comparator (Figure 22). 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.
In the ADCMP552, hysteresis is generated through the
programmable hysteresis pin. A resistor from the HYS pin to
V
CCI
creates a current into the part that is used to generate
hysteresis. Hysteresis generated in this manner is independent
of output swing and is symmetrical around the trip point. The
hysteresis versus resistance curve is shown in Figure 19.
Another method to implement hysteresis is generated by
ABLE
introducing a differential voltage between the LATCH EN
and LATCH ENABLE. inputs (Figure 23).
OUTPUT
INPUT
0
1
0V
–V
H
2
+V
H
2
0
Figure 18. Comparator Hysteresis Transfer Function
TBD
–000
–000
–000
–000
–000
–000
–000
–000
–000
–000
ALL CAPS (Initial caps)
A
Figure 19. Comparator Hysteresis Transfer Function
MINIMUM INPUT SLEW RATE REQUIREMENT
As for all high speed comparators, a minimum slew rate m
be met to ensure that the device does not oscillate when the
input crosses the threshold. This oscillation is due in part to t
high input bandwidth of the comparator and the parasitics of
the package. Analog Devices recommends a slew rate of 1 V/μs
or faster to ensure a clean output transition. If slew rates less
than 1 V/μs are used, hysteresis should be added to reduce the
oscillation.
ust
he
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| ADCMP553BRM | Single Supply High Speed PECL Comparators |
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| ADCMP561BRQ | Dual High Speed PECL Comparators |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADCMP553BRM | 制造商:Analog Devices 功能描述:Comparator Single 5.25V 8-Pin MSOP 制造商:Analog Devices 功能描述:COMPARATOR SGL 5.25V 8MSOP - Rail/Tube 制造商:Analog Devices 功能描述:3.3V to 5V 1 0.75ns Rp[^ 8MSOP Tube 制造商:Analog Devices 功能描述:IC COMPARATOR HIGH SPEED |
| ADCMP553BRMZ | 功能描述:IC COMPARATOR PECL/LVPECL 8MSOP 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: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（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) 產品目錄頁面:1268 (CN2011-ZH PDF) 其它名稱:*LMV331M5*LMV331M5/NOPBLMV331M5CT |
| ADCMP553BRMZ | 制造商:Analog Devices 功能描述:IC, HIGH SPEED COMP, SINGLE, 500PS MSOP8 |
| ADCMP561 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual High Speed PECL Comparators |
| ADCMP561BRQ | 功能描述:IC COMP PECL DUAL HS 16-QSOP RoHS:否 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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