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參數(shù)資料
| 型號： | LT1721 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs |
| 中文描述： | 雙/四路，延遲時間為4.5ns，單電源3V/5V與鐵比較到軌輸出 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 317K |
| 代理商： | LT1721 |
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12
LT1720/LT1721
Technology’s rail-to-rail amplifiers and other products.
But the output of a comparator is digital, and this output
stage can drive TTL or CMOS directly. It can also drive ECL,
as described earlier, or analog loads as demonstrated in
the applications to follow.
The bias conditions and signal swings in the output stages
are designed to turn their respective output transistors off
faster than on. This nearly eliminates the surge of current
from V
CC
to ground that occurs at transitions, keeping the
power consumption low even with high output-toggle
frequencies.
The low surge current is what keeps the power consump-
tion low at high output-toggle frequencies. The frequency
dependence of the supply current is shown in the Typical
Performance Characteristics. Just 20pF of capacitive load
on the output more than triples the frequency dependent
rise. The slope of the no-load curve is just 32
μ
A/MHz. With
a 5V supply, this current is the equivalent of charging and
discharging just 6.5pF. The slope of the 20pF load curve is
133
μ
A/MHz, an addition of 101
μ
A/MHz, or 20
μ
A/MHz-V,
units that are equivalent to picoFarads.
The LT1720/LT1721 dynamic current can be estimated by
adding the external capacitive loading to an internal equiva-
lent capacitance of 5pF to 15pF, multiplied by the toggle
frequency and the supply voltage. Because the capaci-
tance of routing traces can easily approach these values,
the dynamic current is dominated by the load in most
circuits.
APPLICATIO
S I
N
FOR
ATIO
U
Circuit Description
The block diagram of one comparator in the LT1720/LT1721
is shown in Figure 6. There are differential inputs
(+IN/–IN), an output (OUT), a single positive supply (V
CC
)
and ground (GND). All comparators are completely inde-
pendent, sharing only the power and ground pins. The
circuit topology consists of a differential input stage, a
gain stage with hysteresis and a complementary
common-emitter output stage. All of the internal signal
paths utilize low voltage swings for high speed at low power.
The input stage topology maximizes the input dynamic
range available without requiring the power, complexity
and die area of two complete input stages such as are
found in rail-to-rail input comparators. With a 2.7V supply,
the LT1720/LT1721 still have a respectable 1.6V of input
common mode range. The differential input voltage range
is rail-to-rail, without the large input currents found in
competing devices. The input stage also features phase
reversal protection to prevent false outputs when the
inputs are driven below the –100mV common mode
voltage limit.
The internal hysteresis is implemented by positive, nonlin-
ear feedback around a second gain stage. Until this point,
the signal path has been entirely differential. The signal
path is then split into two drive signals for the upper and
lower output transistors. The output transistors are con-
nected common emitter for rail-to-rail output operation.
The Schottky clamps limit the output voltages at about
300mV from the rail, not quite the 50mV or 15mV of Linear
W
U
–
+
–
+
–
+
–
+
+IN
–IN
A
V1
A
V2
NONLINEAR STAGE
OUT
GND
1720/21 F06
V
CC
+
Σ
+
Σ
Figure 6. LT1720/LT1721 Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1721CGN | Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs |
| LT1720CS8 | Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs |
| LT1720CMS8 | Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs |
| LT1721IS | Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs |
| LT1722 | Single, Dual, Quad 200MHz Low Noise Precision Op Amps |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LT1721CGN | 功能描述:IC COMP R-RINOUT QUAD 16-SSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 比較器 系列:UltraFast™ 產(chǎn)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(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 |
| LT1721CGN#PBF | 功能描述:IC COMP R-RINOUT QUAD 16-SSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:UltraFast™ 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 |
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| LT1721CGN#TRPBF | 功能描述:IC COMP R-RINOUT QUAD 16-SSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:UltraFast™ 產(chǎn)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(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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